Archive for the ‘Linux’ Category
Fedora User Manager
As one of my students pointed out, Fedora doesn’t install a GUI user management tool installed by default. That’s true. It’s easy to install. You can install it as the root user, like:
yum install -y system-config-users |
It should generate a screen console output like this when successfully installed:
Loaded plugins: langpacks, refresh-packagekit http://yum.postgresql.org/9.3/fedora/fedora-20-x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found Trying other mirror. Resolving Dependencies --> Running transaction check ---> Package system-config-users.noarch 0:1.3.6-1.fc20 will be installed --> Processing Dependency: libuser-python >= 0.56 for package: system-config-users-1.3.6-1.fc20.noarch --> Processing Dependency: python-pwquality for package: system-config-users-1.3.6-1.fc20.noarch --> Running transaction check ---> Package libuser-python.x86_64 0:0.60-3.fc20 will be installed ---> Package python-pwquality.x86_64 0:1.2.3-1.fc20 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: system-config-users noarch 1.3.6-1.fc20 updates 332 k Installing for dependencies: libuser-python x86_64 0.60-3.fc20 fedora 51 k python-pwquality x86_64 1.2.3-1.fc20 fedora 11 k Transaction Summary ================================================================================ Install 1 Package (+2 Dependent packages) Total download size: 395 k Installed size: 1.9 M Downloading packages: (1/3): libuser-python-0.60-3.fc20.x86_64.rpm | 51 kB 00:00 (2/3): python-pwquality-1.2.3-1.fc20.x86_64.rpm | 11 kB 00:00 (3/3): system-config-users-1.3.6-1.fc20.noarch.rpm | 332 kB 00:00 -------------------------------------------------------------------------------- Total 212 kB/s | 395 kB 00:01 Running transaction check Running transaction test Transaction test succeeded Running transaction (shutdown inhibited) Installing : python-pwquality-1.2.3-1.fc20.x86_64 1/3 Installing : libuser-python-0.60-3.fc20.x86_64 2/3 Installing : system-config-users-1.3.6-1.fc20.noarch 3/3 Verifying : system-config-users-1.3.6-1.fc20.noarch 1/3 Verifying : libuser-python-0.60-3.fc20.x86_64 2/3 Verifying : python-pwquality-1.2.3-1.fc20.x86_64 3/3 Installed: system-config-users.noarch 0:1.3.6-1.fc20 Dependency Installed: libuser-python.x86_64 0:0.60-3.fc20 python-pwquality.x86_64 0:1.2.3-1.fc20 Complete! |
You can verify the GUI user management tool is present with the following command:
which system-config-users |
It should return this:
/bin/system-config-users |
You can run the GUI user management tool from the root user account or any sudoer account. The following shows how to launch the GUI User Manager from a sudoer account:
sudo system-config-users |
It will generate the following GUI User Manager screen:
As always, I hope this helps those trying to do some that should be a basic task that seems to get lost form the books and manuals beginners use.
Fedora Install unixODBC
Encountered a problem while running the RODBC library from the R prompt as the root user, as follows:
> install.packages('RODBC') |
It failed with the following library dependency:
checking for unistd.h... yes
checking sql.h usability... no
checking sql.h presence... no
checking for sql.h... no
checking sqlext.h usability... no
checking sqlext.h presence... no
checking for sqlext.h... no
configure: error: "ODBC headers sql.h and sqlext.h not found"
ERROR: configuration failed for package ‘RODBC’
* removing ‘/usr/lib64/R/library/RODBC’
The downloaded source packages are in
‘/tmp/RtmpdT1gay/downloaded_packages’
Updating HTML index of packages in '.Library'
Making 'packages.html' ... done
Warning message:
In install.packages("RODBC") :
installation of package ‘RODBC’ had non-zero exit status |
I installed unixODBC-devel and unixODBC-gui-qt libraries to fix the library dependencies with the following command as the root user:
yum install -y unixODBC* |
It should show you the following when it installs the unixODBC-devel and unixODBC-gui-qt libraries:
Loaded plugins: langpacks, refresh-packagekit You need to be root to perform this command. [student@localhost ~]$ su - root Password: Last login: Fri Apr 20 21:18:56 PDT 2018 on pts/1 [root@localhost ~]# yum install -y unixODBC* Loaded plugins: langpacks, refresh-packagekit cassandra/signature | 819 B 00:00 cassandra/signature | 2.9 kB 00:00 !!! fedora/20/x86_64/metalink | 3.3 kB 00:00 mysql-connectors-community | 2.5 kB 00:00 mysql-tools-community | 2.5 kB 00:00 mysql56-community | 2.5 kB 00:00 http://yum.postgresql.org/9.3/fedora/fedora-20-x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found Trying other mirror. updates/20/x86_64/metalink | 3.1 kB 00:00 Package unixODBC-2.3.2-4.fc20.x86_64 already installed and latest version Resolving Dependencies --> Running transaction check ---> Package unixODBC-devel.x86_64 0:2.3.2-4.fc20 will be installed ---> Package unixODBC-gui-qt.x86_64 0:0-0.8.20120105svn98.fc20 will be installed --> Processing Dependency: libQtNetwork.so.4()(64bit) for package: unixODBC-gui-qt-0-0.8.20120105svn98.fc20.x86_64 --> Processing Dependency: libQtGui.so.4()(64bit) for package: unixODBC-gui-qt-0-0.8.20120105svn98.fc20.x86_64 --> Processing Dependency: libQtCore.so.4()(64bit) for package: unixODBC-gui-qt-0-0.8.20120105svn98.fc20.x86_64 --> Processing Dependency: libQtAssistantClient.so.4()(64bit) for package: unixODBC-gui-qt-0-0.8.20120105svn98.fc20.x86_64 --> Running transaction check ---> Package qt.x86_64 1:4.8.6-30.fc20 will be installed --> Processing Dependency: qt-common = 1:4.8.6-30.fc20 for package: 1:qt-4.8.6-30.fc20.x86_64 --> Processing Dependency: qt-settings for package: 1:qt-4.8.6-30.fc20.x86_64 ---> Package qt-assistant-adp.x86_64 0:4.6.3-6.fc20 will be installed ---> Package qt-x11.x86_64 1:4.8.6-30.fc20 will be installed --> Processing Dependency: libmng.so.1()(64bit) for package: 1:qt-x11-4.8.6-30.fc20.x86_64 --> Processing Dependency: libclucene.so.3()(64bit) for package: 1:qt-x11-4.8.6-30.fc20.x86_64 --> Running transaction check ---> Package clucene09-core.x86_64 0:0.9.21b-13.fc20 will be installed ---> Package libmng.x86_64 0:1.0.10-12.fc20 will be installed ---> Package qt-common.noarch 1:4.8.6-30.fc20 will be installed ---> Package qt-settings.noarch 0:20-18.fc20 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: unixODBC-devel x86_64 2.3.2-4.fc20 updates 55 k unixODBC-gui-qt x86_64 0-0.8.20120105svn98.fc20 fedora 624 k Installing for dependencies: clucene09-core x86_64 0.9.21b-13.fc20 updates 300 k libmng x86_64 1.0.10-12.fc20 fedora 166 k qt x86_64 1:4.8.6-30.fc20 updates 4.7 M qt-assistant-adp x86_64 4.6.3-6.fc20 fedora 257 k qt-common noarch 1:4.8.6-30.fc20 updates 5.8 k qt-settings noarch 20-18.fc20 updates 19 k qt-x11 x86_64 1:4.8.6-30.fc20 updates 12 M Transaction Summary ================================================================================ Install 2 Packages (+7 Dependent packages) Total download size: 18 M Installed size: 56 M Downloading packages: (1/9): libmng-1.0.10-12.fc20.x86_64.rpm | 166 kB 00:01 (2/9): clucene09-core-0.9.21b-13.fc20.x86_64.rpm | 300 kB 00:01 (3/9): qt-4.8.6-30.fc20.x86_64.rpm | 4.7 MB 00:00 (4/9): qt-common-4.8.6-30.fc20.noarch.rpm | 5.8 kB 00:00 (5/9): qt-settings-20-18.fc20.noarch.rpm | 19 kB 00:00 (6/9): qt-assistant-adp-4.6.3-6.fc20.x86_64.rpm | 257 kB 00:00 (7/9): qt-x11-4.8.6-30.fc20.x86_64.rpm | 12 MB 00:01 (8/9): unixODBC-devel-2.3.2-4.fc20.x86_64.rpm | 55 kB 00:00 (9/9): unixODBC-gui-qt-0-0.8.20120105svn98.fc20.x86_64.rpm | 624 kB 00:01 -------------------------------------------------------------------------------- Total 4.1 MB/s | 18 MB 00:04 Running transaction check Running transaction test Transaction test succeeded Running transaction (shutdown inhibited) Installing : libmng-1.0.10-12.fc20.x86_64 1/9 Installing : qt-settings-20-18.fc20.noarch 2/9 Installing : 1:qt-common-4.8.6-30.fc20.noarch 3/9 Installing : 1:qt-4.8.6-30.fc20.x86_64 4/9 Installing : clucene09-core-0.9.21b-13.fc20.x86_64 5/9 Installing : 1:qt-x11-4.8.6-30.fc20.x86_64 6/9 Installing : qt-assistant-adp-4.6.3-6.fc20.x86_64 7/9 Installing : unixODBC-gui-qt-0-0.8.20120105svn98.fc20.x86_64 8/9 Installing : unixODBC-devel-2.3.2-4.fc20.x86_64 9/9 Verifying : clucene09-core-0.9.21b-13.fc20.x86_64 1/9 Verifying : unixODBC-gui-qt-0-0.8.20120105svn98.fc20.x86_64 2/9 Verifying : 1:qt-x11-4.8.6-30.fc20.x86_64 3/9 Verifying : 1:qt-4.8.6-30.fc20.x86_64 4/9 Verifying : qt-settings-20-18.fc20.noarch 5/9 Verifying : 1:qt-common-4.8.6-30.fc20.noarch 6/9 Verifying : unixODBC-devel-2.3.2-4.fc20.x86_64 7/9 Verifying : qt-assistant-adp-4.6.3-6.fc20.x86_64 8/9 Verifying : libmng-1.0.10-12.fc20.x86_64 9/9 Installed: unixODBC-devel.x86_64 0:2.3.2-4.fc20 unixODBC-gui-qt.x86_64 0:0-0.8.20120105svn98.fc20 Dependency Installed: clucene09-core.x86_64 0:0.9.21b-13.fc20 libmng.x86_64 0:1.0.10-12.fc20 qt.x86_64 1:4.8.6-30.fc20 qt-assistant-adp.x86_64 0:4.6.3-6.fc20 qt-common.noarch 1:4.8.6-30.fc20 qt-settings.noarch 0:20-18.fc20 qt-x11.x86_64 1:4.8.6-30.fc20 Complete! |
After installing the unixODBC-devel and unixODBC-gui-qt libraries, I installed the RODBC library from the R prompt, having launched the R environment as the root user:
> install.packages('RODBC') |
Installing the RODBC library should install cleanly and generate the following output:
Installing package into ‘/usr/lib64/R/library’ (as ‘lib’ is unspecified) trying URL 'http://cran.cnr.berkeley.edu/src/contrib/RODBC_1.3-15.tar.gz' Content type 'application/x-gzip' length 1163967 bytes (1.1 MB) ================================================== downloaded 1.1 MB * installing *source* package ‘RODBC’ ... ** package ‘RODBC’ successfully unpacked and MD5 sums checked checking for gcc... gcc -m64 -std=gnu99 checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc -m64 -std=gnu99 accepts -g... yes checking for gcc -m64 -std=gnu99 option to accept ISO C89... none needed checking how to run the C preprocessor... gcc -m64 -std=gnu99 -E checking for grep that handles long lines and -e... /bin/grep checking for egrep... /bin/grep -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking sql.h usability... yes checking sql.h presence... yes checking for sql.h... yes checking sqlext.h usability... yes checking sqlext.h presence... yes checking for sqlext.h... yes checking for library containing SQLTables... -lodbc checking for SQLLEN... yes checking for SQLULEN... yes checking size of long... 8 configure: creating ./config.status config.status: creating src/Makevars config.status: creating src/config.h ** libs gcc -m64 -std=gnu99 -I/usr/include/R -DNDEBUG -I. -I/usr/local/include -fpic -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -c RODBC.c -o RODBC.o gcc -m64 -std=gnu99 -shared -L/usr/lib64/R/lib -Wl,-z,relro -o RODBC.so RODBC.o -lodbc -L/usr/lib64/R/lib -lR installing to /usr/lib64/R/library/RODBC/libs ** R ** inst ** preparing package for lazy loading ** help *** installing help indices converting help for package ‘RODBC’ finding HTML links ... done RODBC-internal html RODBC-package html odbc html odbcClose html odbcConnect html odbcDataSources html odbcGetInfo html odbcSetAutoCommit html setSqlTypeInfo html sqlColumns html sqlCopy html sqlDrop html sqlFetch html sqlQuery html sqlSave html sqlTables html sqlTypeInfo html ** building package indices ** installing vignettes ** testing if installed package can be loaded * DONE (RODBC) Making 'packages.html' ... done The downloaded source packages are in ‘/tmp/RtmpdT1gay/downloaded_packages’ Updating HTML index of packages in '.Library' Making 'packages.html' ... done |
I hope that helps anybody who runs into the library dependency problems.
Fedora R Install
I’ve started building the new image for the database courses. This one needs to include Oracle, MySQL, Cassandra, Hive, and MongoDB databases; and include examples for C, C++, Java, Perl, PHP, Python, R programming languages.
Installing R was a surprise when I saw how many packages there are for it. It’s a standard yum command from the repository, but it will install 256 packages. The command is:
yum install -y R |
Once you install it, you simply start the R interpreter, which is part of the Comprehensive R Archive Network (CRAN). Any installation of the R packages includes CRAN, but there are many additional libraries that you may install.
You can launch the R interpreter by typing the following at the Linux command-line:
R |
It will display the following licensing information and then the command prompt:
R version 3.2.0 (2015-04-16) -- "Full of Ingredients" Copyright (C) 2015 The R Foundation for Statistical Computing Platform: x86_64-redhat-linux-gnu (64-bit) R is free software and comes with ABSOLUTELY NO WARRANTY. You are welcome to redistribute it under certain conditions. Type 'license()' or 'licence()' for distribution details. Natural language support but running in an English locale R is a collaborative project with many contributors. Type 'contributors()' for more information and 'citation()' on how to cite R or R packages in publications. Type 'demo()' for some demos, 'help()' for on-line help, or 'help.start()' for an HTML browser interface to help. Type 'q()' to quit R. |
You have two options for help. As qualified above, you can type help() to get a Linux man page, and q at the colon quits the man page. Typing help.start() launches a browser interface (shown below), which is more helpful.
You can discover your installed R packages with a call to the installed.packages() function but the output lacks clarity and is verbose. You can see a formatted summary of your installed packages with the following command:
print(as.data.frame(installed.packages()[,c(1,3:4)]),row.names=FALSE) |
It should display the following:
Package Version Priority
base 3.2.0 base
boot 1.3-16 recommended
class 7.3-12 recommended
cluster 2.0.1 recommended
codetools 0.2-11 recommended
compiler 3.2.0 base
datasets 3.2.0 base
foreign 0.8-63 recommended
graphics 3.2.0 base
grDevices 3.2.0 base
grid 3.2.0 base
KernSmooth 2.23-14 recommended
lattice 0.20-31 recommended
MASS 7.3-40 recommended
Matrix 1.2-0 recommended
methods 3.2.0 base
mgcv 1.8-6 recommended
nlme 3.1-120 recommended
nnet 7.3-9 recommended
parallel 3.2.0 base
rpart 4.1-9 recommended
spatial 7.3-9 recommended
splines 3.2.0 base
stats 3.2.0 base
stats4 3.2.0 base
survival 2.38-1 recommended
tcltk 3.2.0 base
tools 3.2.0 base
utils 3.2.0 base |
The print() function allows us to remove the text-based indexes from display. The indexes would be the same as the package names. If you call frame() function with a second argument of row.names=FALSE, then R converts the text-based indexes to numeric indexes.
You can quit the R environment with the q() or quit() function calls. It will prompt you whether or not you want to save your workspace before you exit.
It’s time to play with R now. I hope this helps you get started by installing and playing with the R programming language.
How to install MongoDB
This post shows the yum command to install the MongoDB packages on Linux. More on setup and use will follow.
You install the MongoDB package with the following yum command:
yum install -y mongodb |
You should see the following log file, which may also show a missing mirrored site:
Loaded plugins: langpacks, refresh-packagekit cassandra/signature | 819 B 00:00 cassandra/signature | 2.9 kB 00:00 !!! mysql-connectors-community | 2.5 kB 00:00 mysql-tools-community | 2.5 kB 00:00 mysql56-community | 2.5 kB 00:00 updates/20/x86_64/metalink | 2.6 kB 00:00 Resolving Dependencies --> Running transaction check ---> Package mongodb.x86_64 0:2.4.6-1.fc20 will be installed --> Processing Dependency: v8 for package: mongodb-2.4.6-1.fc20.x86_64 --> Processing Dependency: libv8.so.3()(64bit) for package: mongodb-2.4.6-1.fc20.x86_64 --> Processing Dependency: libtcmalloc.so.4()(64bit) for package: mongodb-2.4.6-1.fc20.x86_64 --> Processing Dependency: libboost_program_options.so.1.54.0()(64bit) for package: mongodb-2.4.6-1.fc20.x86_64 --> Processing Dependency: libboost_iostreams.so.1.54.0()(64bit) for package: mongodb-2.4.6-1.fc20.x86_64 --> Processing Dependency: libboost_filesystem.so.1.54.0()(64bit) for package: mongodb-2.4.6-1.fc20.x86_64 --> Running transaction check ---> Package boost-filesystem.x86_64 0:1.54.0-12.fc20 will be installed ---> Package boost-iostreams.x86_64 0:1.54.0-12.fc20 will be installed ---> Package boost-program-options.x86_64 0:1.54.0-12.fc20 will be installed ---> Package gperftools-libs.x86_64 0:2.1-4.fc20 will be installed ---> Package v8.x86_64 1:3.14.5.10-18.fc20 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: mongodb x86_64 2.4.6-1.fc20 fedora 30 M Installing for dependencies: boost-filesystem x86_64 1.54.0-12.fc20 updates 66 k boost-iostreams x86_64 1.54.0-12.fc20 updates 59 k boost-program-options x86_64 1.54.0-12.fc20 updates 147 k gperftools-libs x86_64 2.1-4.fc20 updates 266 k v8 x86_64 1:3.14.5.10-18.fc20 updates 3.0 M Transaction Summary ================================================================================ Install 1 Package (+5 Dependent packages) Total download size: 34 M Installed size: 101 M Downloading packages: (1/6): boost-iostreams-1.54.0-12.fc20.x86_64.rpm | 59 kB 00:00 (2/6): boost-filesystem-1.54.0-12.fc20.x86_64.rpm | 66 kB 00:00 (3/6): boost-program-options-1.54.0-12.fc20.x86_64.rpm | 147 kB 00:00 (4/6): gperftools-libs-2.1-4.fc20.x86_64.rpm | 266 kB 00:00 (5/6): v8-3.14.5.10-18.fc20.x86_64.rpm | 3.0 MB 00:00 (6/6): mongodb-2.4.6-1.fc20.x86_64.rpm | 30 MB 00:04 -------------------------------------------------------------------------------- Total 7.6 MB/s | 34 MB 00:04 Running transaction check Running transaction test Transaction test succeeded Running transaction (shutdown inhibited) Installing : 1:v8-3.14.5.10-18.fc20.x86_64 1/6 Installing : boost-program-options-1.54.0-12.fc20.x86_64 2/6 Installing : gperftools-libs-2.1-4.fc20.x86_64 3/6 Installing : boost-filesystem-1.54.0-12.fc20.x86_64 4/6 Installing : boost-iostreams-1.54.0-12.fc20.x86_64 5/6 Installing : mongodb-2.4.6-1.fc20.x86_64 6/6 Verifying : boost-iostreams-1.54.0-12.fc20.x86_64 1/6 Verifying : boost-filesystem-1.54.0-12.fc20.x86_64 2/6 Verifying : gperftools-libs-2.1-4.fc20.x86_64 3/6 Verifying : mongodb-2.4.6-1.fc20.x86_64 4/6 Verifying : boost-program-options-1.54.0-12.fc20.x86_64 5/6 Verifying : 1:v8-3.14.5.10-18.fc20.x86_64 6/6 Installed: mongodb.x86_64 0:2.4.6-1.fc20 Dependency Installed: boost-filesystem.x86_64 0:1.54.0-12.fc20 boost-iostreams.x86_64 0:1.54.0-12.fc20 boost-program-options.x86_64 0:1.54.0-12.fc20 gperftools-libs.x86_64 0:2.1-4.fc20 v8.x86_64 1:3.14.5.10-18.fc20 Complete! |
Hope this helps those looking for the command.
Python variable not defined
While working with a programming example for my students, I ran into an interesting run-time error when I changed their approach to importing Python’s random module. Here’s the raised error message:
Traceback (most recent call last): File "windowBouncingBalls.py", line 84, in <module> speed = [choice([-2,2]), choice([-2,2])] NameError: name 'choice' is not defined |
You raise the missing choice identifier when two things occur. The first thing requires you to use a standard import statement, like the following example, and the second thing requires you to continue to reference the identifier as “choice“.
import random |
You can avoid the error by making the import of random like this:
from random import * |
Or, you can leave the ordinary import statement and fully qualify the choice identifier with the random module name, like this:
speed = [random.choice([-2,2]), random.choice([-2,2])] |
As always, I hope this helps those who encounter a similar problem.
Install PyGame on Fedora
The PyGame library is a wonderful tool for building games with Python. It lets you accomplish a great deal by simply managing events. You need to understand how to use Python functions, modules, and events to build games with this Python library.
You can download and install the PyGame library with the yum utility like this:
yum install -y pygame |
It should generate the following list when you install it as the root user:
Loaded plugins: langpacks, refresh-packagekit Available Packages pygame.x86_64 1.9.1-14.fc20 fedora [root@localhost ~]# yum install -y pygame Loaded plugins: langpacks, refresh-packagekit Resolving Dependencies --> Running transaction check ---> Package pygame.x86_64 0:1.9.1-14.fc20 will be installed --> Processing Dependency: numpy for package: pygame-1.9.1-14.fc20.x86_64 --> Processing Dependency: libportmidi.so.0()(64bit) for package: pygame-1.9.1-14.fc20.x86_64 --> Processing Dependency: libSDL_ttf-2.0.so.0()(64bit) for package: pygame-1.9.1-14.fc20.x86_64 --> Processing Dependency: libSDL_mixer-1.2.so.0()(64bit) for package: pygame-1.9.1-14.fc20.x86_64 --> Processing Dependency: libSDL_image-1.2.so.0()(64bit) for package: pygame-1.9.1-14.fc20.x86_64 --> Running transaction check ---> Package SDL_image.x86_64 0:1.2.12-7.fc20 will be installed ---> Package SDL_mixer.x86_64 0:1.2.12-5.fc20 will be installed --> Processing Dependency: libmikmod for package: SDL_mixer-1.2.12-5.fc20.x86_64 ---> Package SDL_ttf.x86_64 0:2.0.11-4.fc20 will be installed ---> Package numpy.x86_64 1:1.8.2-2.fc20 will be installed --> Processing Dependency: python-nose for package: 1:numpy-1.8.2-2.fc20.x86_64 ---> Package portmidi.x86_64 0:217-9.fc20 will be installed --> Running transaction check ---> Package libmikmod.x86_64 0:3.3.6-3.fc20 will be installed ---> Package python-nose.noarch 0:1.3.0-1.fc20 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: pygame x86_64 1.9.1-14.fc20 fedora 2.1 M Installing for dependencies: SDL_image x86_64 1.2.12-7.fc20 fedora 41 k SDL_mixer x86_64 1.2.12-5.fc20 fedora 91 k SDL_ttf x86_64 2.0.11-4.fc20 fedora 22 k libmikmod x86_64 3.3.6-3.fc20 updates 142 k numpy x86_64 1:1.8.2-2.fc20 updates 3.0 M portmidi x86_64 217-9.fc20 fedora 26 k python-nose noarch 1.3.0-1.fc20 fedora 272 k Transaction Summary ================================================================================ Install 1 Package (+7 Dependent packages) Total download size: 5.7 M Installed size: 21 M Downloading packages: (1/8): SDL_image-1.2.12-7.fc20.x86_64.rpm | 41 kB 00:00 (2/8): SDL_mixer-1.2.12-5.fc20.x86_64.rpm | 91 kB 00:00 (3/8): portmidi-217-9.fc20.x86_64.rpm | 26 kB 00:00 (4/8): SDL_ttf-2.0.11-4.fc20.x86_64.rpm | 22 kB 00:00 (5/8): libmikmod-3.3.6-3.fc20.x86_64.rpm | 142 kB 00:00 (6/8): numpy-1.8.2-2.fc20.x86_64.rpm | 3.0 MB 00:02 (7/8): pygame-1.9.1-14.fc20.x86_64.rpm | 2.1 MB 00:01 (8/8): python-nose-1.3.0-1.fc20.noarch.rpm | 272 kB 00:00 -------------------------------------------------------------------------------- Total 1.7 MB/s | 5.7 MB 00:03 Running transaction check Running transaction test Transaction test succeeded Running transaction (shutdown inhibited) Installing : SDL_ttf-2.0.11-4.fc20.x86_64 1/8 Installing : SDL_image-1.2.12-7.fc20.x86_64 2/8 Installing : portmidi-217-9.fc20.x86_64 3/8 Installing : libmikmod-3.3.6-3.fc20.x86_64 4/8 Installing : SDL_mixer-1.2.12-5.fc20.x86_64 5/8 Installing : python-nose-1.3.0-1.fc20.noarch 6/8 Installing : 1:numpy-1.8.2-2.fc20.x86_64 7/8 Installing : pygame-1.9.1-14.fc20.x86_64 8/8 Verifying : pygame-1.9.1-14.fc20.x86_64 1/8 Verifying : SDL_mixer-1.2.12-5.fc20.x86_64 2/8 Verifying : python-nose-1.3.0-1.fc20.noarch 3/8 Verifying : libmikmod-3.3.6-3.fc20.x86_64 4/8 Verifying : 1:numpy-1.8.2-2.fc20.x86_64 5/8 Verifying : portmidi-217-9.fc20.x86_64 6/8 Verifying : SDL_image-1.2.12-7.fc20.x86_64 7/8 Verifying : SDL_ttf-2.0.11-4.fc20.x86_64 8/8 Installed: pygame.x86_64 0:1.9.1-14.fc20 Dependency Installed: SDL_image.x86_64 0:1.2.12-7.fc20 SDL_mixer.x86_64 0:1.2.12-5.fc20 SDL_ttf.x86_64 0:2.0.11-4.fc20 libmikmod.x86_64 0:3.3.6-3.fc20 numpy.x86_64 1:1.8.2-2.fc20 portmidi.x86_64 0:217-9.fc20 python-nose.noarch 0:1.3.0-1.fc20 Complete! |
I hope this helps folks install the software.
Install EasyGUI on Fedora
The EasyGUI library is a nice tool for developing GUI applications. It doesn’t require you to know event-driven programming to write basic GUI applications because it’s based on Python functions.
You can download and install the EasyGUI library with yum utility like this:
yum install -y python-easygui |
It should generate the following list:
Loaded plugins: langpacks, refresh-packagekit mysql-connectors-community | 2.5 kB 00:00 mysql-tools-community | 2.5 kB 00:00 mysql56-community | 2.5 kB 00:00 pgdg93 | 3.6 kB 00:00 updates/20/x86_64/metalink | 2.8 kB 00:00 Resolving Dependencies --> Running transaction check ---> Package python-easygui.noarch 0:0.96-7.fc20 will be installed --> Processing Dependency: tkinter for package: python-easygui-0.96-7.fc20.noarch --> Processing Dependency: python-setuptools for package: python-easygui-0.96-7.fc20.noarch --> Running transaction check ---> Package python-setuptools.noarch 0:1.4.2-1.fc20 will be installed ---> Package tkinter.x86_64 0:2.7.5-16.fc20 will be installed --> Processing Dependency: libtk8.5.so()(64bit) for package: tkinter-2.7.5-16.fc20.x86_64 --> Processing Dependency: libtcl8.5.so()(64bit) for package: tkinter-2.7.5-16.fc20.x86_64 --> Processing Dependency: libTix.so()(64bit) for package: tkinter-2.7.5-16.fc20.x86_64 --> Running transaction check ---> Package tcl.x86_64 1:8.5.14-1.fc20 will be installed ---> Package tix.x86_64 1:8.4.3-11.fc20 will be installed ---> Package tk.x86_64 1:8.5.14-1.fc20 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: python-easygui noarch 0.96-7.fc20 fedora 481 k Installing for dependencies: python-setuptools noarch 1.4.2-1.fc20 updates 413 k tcl x86_64 1:8.5.14-1.fc20 fedora 1.9 M tix x86_64 1:8.4.3-11.fc20 fedora 253 k tk x86_64 1:8.5.14-1.fc20 fedora 1.4 M tkinter x86_64 2.7.5-16.fc20 updates 316 k Transaction Summary ================================================================================ Install 1 Package (+5 Dependent packages) Total download size: 4.7 M Installed size: 13 M Downloading packages: (1/6): python-setuptools-1.4.2-1.fc20.noarch.rpm | 413 kB 00:00 (2/6): python-easygui-0.96-7.fc20.noarch.rpm | 481 kB 00:00 (3/6): tkinter-2.7.5-16.fc20.x86_64.rpm | 316 kB 00:00 (4/6): tix-8.4.3-11.fc20.x86_64.rpm | 253 kB 00:01 (5/6): tcl-8.5.14-1.fc20.x86_64.rpm | 1.9 MB 00:01 (6/6): tk-8.5.14-1.fc20.x86_64.rpm | 1.4 MB 00:03 -------------------------------------------------------------------------------- Total 1.5 MB/s | 4.7 MB 00:03 Running transaction check Running transaction test Transaction test succeeded Running transaction (shutdown inhibited) Installing : 1:tcl-8.5.14-1.fc20.x86_64 1/6 Installing : 1:tk-8.5.14-1.fc20.x86_64 2/6 Installing : 1:tix-8.4.3-11.fc20.x86_64 3/6 Installing : tkinter-2.7.5-16.fc20.x86_64 4/6 Installing : python-setuptools-1.4.2-1.fc20.noarch 5/6 Installing : python-easygui-0.96-7.fc20.noarch 6/6 Verifying : 1:tk-8.5.14-1.fc20.x86_64 1/6 Verifying : tkinter-2.7.5-16.fc20.x86_64 2/6 Verifying : 1:tix-8.4.3-11.fc20.x86_64 3/6 Verifying : 1:tcl-8.5.14-1.fc20.x86_64 4/6 Verifying : python-easygui-0.96-7.fc20.noarch 5/6 Verifying : python-setuptools-1.4.2-1.fc20.noarch 6/6 Installed: python-easygui.noarch 0:0.96-7.fc20 Dependency Installed: python-setuptools.noarch 0:1.4.2-1.fc20 tcl.x86_64 1:8.5.14-1.fc20 tix.x86_64 1:8.4.3-11.fc20 tk.x86_64 1:8.5.14-1.fc20 tkinter.x86_64 0:2.7.5-16.fc20 Complete! |
You can then test the EasyGUI library with the following three lines of code inside the IDLE interpreter:
Python 2.7.5 (default, Apr 10 2015, 08:09:05) [GCC 4.8.3 20140911 (Red Hat 4.8.3-7)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import easygui >>> flavor = easygui.enterbox("What flavor of bum do you like?") >>> if easygui.msgbox("You like " + flavor + " gum.") == 'OK': ... print "OK button clicked ..." ... OK button clicked ... |
The easygui.enterbox call displays the image below. Enter “Peppermint” in the entry box and click the OK button to assign the “Peppermint” string literal to the flavor variable.
The easygui.msgbox call displays the message below:
When you click the OK button, the program returns an “OK” string to the Python code. It prints the string “OK button clicked …” string:
As always, I hope this helps those looking for instructions and a quick way to play with Python and GUI applications.
Install cx_Oracle for Python
This shows you how to install the cx_Oracle library for Python 2.7 on Fedora Linux. If Fedora has it on the server you can download it with the following yum command:
yum install -y cx_Oracle-5.2.1-11g-py27-1.x86_64.rpm |
Currently, you’ll get the following failure because it’s not available in the Fedora repository:
Loaded plugins: langpacks, refresh-packagekit mysql-connectors-community | 2.5 kB 00:00:00 mysql-tools-community | 2.5 kB 00:00:00 mysql56-community | 2.5 kB 00:00:00 pgdg93 | 3.6 kB 00:00:00 updates/20/x86_64/metalink | 2.3 kB 00:00:00 No package cx_Oracle-5.2.1-11g-py27-1.x86_64.rpm available. Error: Nothing to do |
You can download the cx_Oracle library from the Python web site. The cx_Oracle documentation qualifies module interfaces, objects, and connections. Assuming your Linux user’s name is student, you download the cx_Oracle library into the /home/student/Downloads directory. Then, you use the su or sudo command to become the root user.
As the root user, run the following yum command:
yum install -y ~student/Downloads/cx_Oracle-5.2.1-11g-py27-1.x86_64.rpm |
You should see the following output:
Loaded plugins: langpacks, refresh-packagekit Examining /home/student/Downloads/cx_Oracle-5.2.1-11g-py27-1.x86_64.rpm: cx_Oracle-5.2.1-1.x86_64 Marking /home/student/Downloads/cx_Oracle-5.2.1-11g-py27-1.x86_64.rpm to be installed Resolving Dependencies --> Running transaction check ---> Package cx_Oracle.x86_64 0:5.2.1-1 will be installed --> Finished Dependency Resolution Dependencies Resolved ======================================================================================= Package Arch Version Repository Size ======================================================================================= Installing: cx_Oracle x86_64 5.2.1-1 /cx_Oracle-5.2.1-11g-py27-1.x86_64 717 k Transaction Summary ======================================================================================= Install 1 Package Total size: 717 k Installed size: 717 k Downloading packages: Running transaction check Running transaction test Transaction test succeeded Running transaction (shutdown inhibited) Installing : cx_Oracle-5.2.1-1.x86_64 1/1 Verifying : cx_Oracle-5.2.1-1.x86_64 1/1 Installed: cx_Oracle.x86_64 0:5.2.1-1 Complete! |
After you install the cx_Oracle-5.2.1-1.x86_64 package, you can find the installed files with this rpm command:
rpm -ql cx_Oracle-5.2.1-1.x86_64 |
It lists:
/usr/lib64/python2.7/site-packages/cx_Oracle-5.2.1-py2.7.egg-info /usr/lib64/python2.7/site-packages/cx_Oracle-5.2.1-py2.7.egg-info/PKG-INFO /usr/lib64/python2.7/site-packages/cx_Oracle-5.2.1-py2.7.egg-info/SOURCES.txt /usr/lib64/python2.7/site-packages/cx_Oracle-5.2.1-py2.7.egg-info/dependency_links.txt /usr/lib64/python2.7/site-packages/cx_Oracle-5.2.1-py2.7.egg-info/top_level.txt /usr/lib64/python2.7/site-packages/cx_Oracle.so /usr/share/doc/cx_Oracle-5.2.1 /usr/share/doc/cx_Oracle-5.2.1/BUILD.txt /usr/share/doc/cx_Oracle-5.2.1/README.txt /usr/share/doc/cx_Oracle-5.2.1/samples /usr/share/doc/cx_Oracle-5.2.1/samples/DatabaseChangeNotification.py /usr/share/doc/cx_Oracle-5.2.1/samples/DatabaseShutdown.py /usr/share/doc/cx_Oracle-5.2.1/samples/DatabaseStartup.py /usr/share/doc/cx_Oracle-5.2.1/samples/ReturnLongs.py /usr/share/doc/cx_Oracle-5.2.1/samples/ReturnUnicode.py /usr/share/doc/cx_Oracle-5.2.1/samples/RowsAsInstance.py /usr/share/doc/cx_Oracle-5.2.1/test /usr/share/doc/cx_Oracle-5.2.1/test/3kArrayDMLBatchError.py /usr/share/doc/cx_Oracle-5.2.1/test/3kNumberVar.py /usr/share/doc/cx_Oracle-5.2.1/test/3kStringVar.py /usr/share/doc/cx_Oracle-5.2.1/test/ArrayDMLBatchError.py /usr/share/doc/cx_Oracle-5.2.1/test/BooleanVar.py /usr/share/doc/cx_Oracle-5.2.1/test/Connection.py /usr/share/doc/cx_Oracle-5.2.1/test/Cursor.py /usr/share/doc/cx_Oracle-5.2.1/test/CursorVar.py /usr/share/doc/cx_Oracle-5.2.1/test/DateTimeVar.py /usr/share/doc/cx_Oracle-5.2.1/test/IntervalVar.py /usr/share/doc/cx_Oracle-5.2.1/test/LobVar.py /usr/share/doc/cx_Oracle-5.2.1/test/LongVar.py /usr/share/doc/cx_Oracle-5.2.1/test/NCharVar.py /usr/share/doc/cx_Oracle-5.2.1/test/NumberVar.py /usr/share/doc/cx_Oracle-5.2.1/test/ObjectVar.py /usr/share/doc/cx_Oracle-5.2.1/test/SessionPool.py /usr/share/doc/cx_Oracle-5.2.1/test/SetupTest.sql /usr/share/doc/cx_Oracle-5.2.1/test/StringVar.py /usr/share/doc/cx_Oracle-5.2.1/test/TestEnv.py /usr/share/doc/cx_Oracle-5.2.1/test/TimestampVar.py /usr/share/doc/cx_Oracle-5.2.1/test/test.py /usr/share/doc/cx_Oracle-5.2.1/test/test3k.py /usr/share/doc/cx_Oracle-5.2.1/test/test_dbapi20.py /usr/share/doc/cx_Oracle-5.2.1/test/uArrayDMLBatchError.py /usr/share/doc/cx_Oracle-5.2.1/test/uConnection.py /usr/share/doc/cx_Oracle-5.2.1/test/uCursor.py /usr/share/doc/cx_Oracle-5.2.1/test/uCursorVar.py /usr/share/doc/cx_Oracle-5.2.1/test/uDateTimeVar.py /usr/share/doc/cx_Oracle-5.2.1/test/uIntervalVar.py /usr/share/doc/cx_Oracle-5.2.1/test/uLobVar.py /usr/share/doc/cx_Oracle-5.2.1/test/uLongVar.py /usr/share/doc/cx_Oracle-5.2.1/test/uNumberVar.py /usr/share/doc/cx_Oracle-5.2.1/test/uObjectVar.py /usr/share/doc/cx_Oracle-5.2.1/test/uSessionPool.py /usr/share/doc/cx_Oracle-5.2.1/test/uStringVar.py /usr/share/doc/cx_Oracle-5.2.1/test/uTimestampVar.py |
After you installed the software, you can test whether inside Python’s IDLE environment with the import command, like this:
Python 2.7.5 (default, Apr 10 2015, 08:09:05) [GCC 4.8.3 20140911 (Red Hat 4.8.3-7)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import cx_Oracle Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: libclntsh.so.11.1: cannot open shared object file: No such file or directory |
This error indicates that Oracle Client software isn’t installed, which is true in this case. I only installed the Oracle Database 11g Express Edition. You need to download the Oracle Client software and install it as the root user.
You download the Oracle Client software from the Oracle web site. Assuming your Linux user’s name is student, you download the cx_Oracle library into the /home/student/Downloads directory. Then, you use the su or sudo command to become the root user.
As the root user, run the following yum command:
yum install -y ~student/Downloads/oracle-instantclient11.2-basic-11.2.0.4.0-1.x86_64.rpm |
You should see the following output:
Loaded plugins: langpacks, refresh-packagekit
Examining /home/student/Downloads/oracle-instantclient11.2-basic-11.2.0.4.0-1.x86_64.rpm: oracle-instantclient11.2-basic-11.2.0.4.0-1.x86_64
Marking /home/student/Downloads/oracle-instantclient11.2-basic-11.2.0.4.0-1.x86_64.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package oracle-instantclient11.2-basic.x86_64 0:11.2.0.4.0-1 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package
Arch Version
Repository Size
================================================================================
Installing:
oracle-instantclient11.2-basic
x86_64 11.2.0.4.0-1
/oracle-instantclient11.2-basic-11.2.0.4.0-1.x86_64 179 M
Transaction Summary
================================================================================
Install 1 Package
Total size: 179 M
Installed size: 179 M
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction (shutdown inhibited)
Installing : oracle-instantclient11.2-basic-11.2.0.4.0-1.x86_64 1/1
Verifying : oracle-instantclient11.2-basic-11.2.0.4.0-1.x86_64 1/1
Installed:
oracle-instantclient11.2-basic.x86_64 0:11.2.0.4.0-1
Complete! |
You can create a Python program that checks your ability to connect to the Oracle database, like the following oracleConnection.py file:
# Import the Oracle library. import cx_Oracle try: # Create a connection. db = cx_Oracle.connect("student/student@xe") # Print a message. print "Connected to the Oracle " + db.version + " database." except cx_Oracle.DatabaseError, e: error, = e.args print >> sys.stderr, "Oracle-Error-Code:", error.code print >> sys.stderr, "Oracle-Error-Message:", error.message finally: # Close cursor. db.close() |
You can run this from the Linux command line with the following syntax:
python oracleConnection.py |
It should return the following string:
Connected to the Oracle 11.2.0.2.0 database. |
Now, you can create a Python program that reads data from the Oracle database. The following oracleString.py file reads a string literal from the pseudo table dual:
# Import the Oracle library. import cx_Oracle try: # Create a connection. db = cx_Oracle.connect("student/student@xe") # Create a cursor. cursor = db.cursor() # Execute a query. cursor.execute("SELECT 'Hello world!' FROM dual") # Read the contents of the cursor. for row in cursor: print (row[0]) except cx_Oracle.DatabaseError, e: error, = e.args print >> sys.stderr, "Oracle-Error-Code:", error.code print >> sys.stderr, "Oracle-Error-Message:", error.message finally: # Close cursor and connection. cursor.close() db.close() |
You can run this from the Linux command line with the following syntax:
python oracleString.py |
It should return the following string:
Hello world! |
Now, you can create a Python program that reads actual table data from the Oracle database (assuming you have a copy of my video store database). The following oracleTable.py file reads a string literal from the pseudo table dual:
# Import the Oracle library. import cx_Oracle try: # Create a connection. db = cx_Oracle.connect("student/student@xe") # Create a cursor. cursor = db.cursor() # Execute a query. cursor.execute("SELECT item_title, item_subtitle FROM item") # Read the contents of the cursor. for row in cursor: print (row[0], row[1]) except cx_Oracle.DatabaseError, e: error, = e.args print >> sys.stderr, "Oracle-Error-Code:", error.code print >> sys.stderr, "Oracle-Error-Message:", error.message finally: # Close cursor and connection. cursor.close() db.close() |
You can run this from the Linux command line with the following syntax:
python oracleTable.py |
It should return the following strings (only a subset of the returned values):
("Harry Potter and the Sorcer's Stone", 'Two-Disc Special Edition')
('Harry Potter and the Chamber of Secrets', 'Two-Disc Special Edition')
('Harry Potter and the Prisoner of Azkaban', 'Two-Disc Special Edition')
('Harry Potter and the Chamber of Secrets', None)
('Harry Potter and the Goblet of Fire', 'Widescreen Edition')
('Harry Potter and the Goblet of Fire', 'Two-Disc Special Edition')
('Harry Potter and the Order of the Phoenix', 'Widescreen Edition')
('The Lord of the Rings - Fellowship of the Ring', 'Widescreen Edition')
('The Lord of the Rings - Fellowship of the Ring', 'Platinum Series Special Extended Edition')
('The Lord of the Rings - Two Towers', 'Widescreen Edition')
('The Lord of the Rings - Two Towers', 'Platinum Series Special Extended Edition')
('The Lord of the Rings - The Return of the King', 'Widescreen Edition')
('The Lord of the Rings - The Return of the King', 'Platinum Series Special Extended Edition')
('Star Wars - Episode I', 'The Phantom Menace')
('Star Wars - Episode II', 'Attack of the Clones')
('Star Wars - Episode III', 'Revenge of the Sith')
('Star Wars - Episode IV', 'A New Hope')
('Star Wars - Episode V', 'The Empire Strikes Back')
('Star Wars - Episode VI', 'Return of the Jedi') |
As always, I hope this helps others who want to work with Python and the Oracle database.
Oracle Segment Fails
The instance that I’ve built for my students in a Fedora VM is quite stable except for one feature. The feature is the hibernation process of the base operating system. Sometimes when the base operating system hibernates, it causes the Oracle shared memory segment to fail. When that happens you get the following error:
ERROR: ORA-01034: ORACLE NOT available ORA-27101: shared memory realm does NOT exist Linux-x86_64 Error: 2: No such FILE OR DIRECTORY Process ID: 0 SESSION ID: 0 Serial NUMBER: 0 |
I created the master sudoer account as the student user. The oracle user is configured so that you can’t log in to the Linux OS with it. To restart the instance you can do the following in a default Oracle 11g XE installation:
su - root |
or, you can do this:
sudo sh |
Then as the root user, you can sign on to the oracle user’s account by using the su command without a password, like:
su - oracle |
As the user who installed the Oracle instance, you can connect to the database without a password after you source the environment file. The standard Oracle 11g XE environment file can be sources like this:
. /u01/app/oracle/product/11.2.0/xe/bin/oracle_env.sh |
Alternatively, for my students there is a .bashrc file that they can manually source. It contains the following:
# Source global definitions if [ -f /etc/bashrc ]; then . /etc/bashrc fi # Uncomment the following line if you don't like systemctl's auto-paging feature: # export SYSTEMD_PAGER= # User specific aliases and functions . /u01/app/oracle/product/11.2.0/xe/bin/oracle_env.sh # Wrap sqlplus with rlwrap to edit prior lines with the # up, down, left and right keys. sqlplus () { # Discover the fully qualified program name. path=`which rlwrap 2>/dev/null` file='' # Parse the program name from the path. if [ -n ${path} ]; then file=${path##/*/} fi; # Wrap when there is a file and it is rewrap. if [ -n ${file} ] && [[ ${file} = "rlwrap" ]]; then rlwrap sqlplus "${@}" else echo "Command-line history unavailable: Install the rlwrap package." $ORACLE_HOME/bin/sqlplus "${@}" fi } # Set vi as a command line editor. set -o vi |
You can source the oracle user’s .bashrc account, like this:
. .bashrc |
After you’ve sourced the environment, you can connect as the internal user with the following syntax:
sqlplus / AS sysdba |
Connected as the internal user, run these two commands in sequence:
shutdown IMMEDIATE
startup |
Then, you should be able to connect as the student user or another ordinary user with the following syntax:
CONNECT student/student |
Hope this helps my students and those who want to know how to restart the Oracle instance.
Can’t Display 256 Colors
If you’re reading this post, you most likely are trying to run the Oracle Database 11g or 12c runInstaller program, and it’s failing a critical dependency check and displaying an error like the one below. If so, choose n because if you choose y it won’t launch the Oracle Installer.
Starting Oracle Universal Installer...
Checking Temp space: must be greater than 500 MB. Actual 30824 MB Passed
Checking swap space: must be greater than 150 MB. Actual 3967 MB Passed
Checking monitor: must be configured to display at least 256 colors
>>> Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set. Failed <<<<
Some requirement checks failed. You must fulfill these requirements before
continuing with the installation,
Continue? (y/n) [n] n |
The first thing to check is whether you’ve the $TERM environment variable. It’ll be set in your env list but may not be set in your .bashrc file. You can see whether it’s set by running the following command:
echo $TERM |
It should return a value, like this:
xterm-256color |
If you didn’t get that value, use the env command to lookup the $TERM. The correct value can be found by running the env command like this:
env | grep -i term |
Add $TERM environment variable to your .bashrc file and source it after the change or reboot the user’s session:
export TERM=xterm-256color |
If it still doesn’t work, some posts ask you to run xclock but you don’t generally install the xhost clients. Those articles assumes you’ve installed the xorg-x11-apps package library. That’s more or less a choice you made when installing the Linux OS. You can check for the presence of the library with the following command as the root user:
rpm -qa xorg-x11-apps |
If the command fails to return a result from the search of Red Hat Package Manager (RPM) libraries, you haven’t installed it. You can install it as the root superuser with this syntax:
yum install -y xorg-x11-apps |
It should display the following result when successful:
Loaded plugins: langpacks Resolving Dependencies --> Running transaction check ---> Package xorg-x11-apps.x86_64 0:7.7-6.el7 will be installed --> Processing Dependency: libXaw.so.7()(64bit) for package: xorg-x11-apps-7.7-6.el7.x86_64 --> Running transaction check ---> Package libXaw.x86_64 0:1.0.12-5.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================= Package Arch Version Repository Size ================================================================================= Installing: xorg-x11-apps x86_64 7.7-6.el7 ol7_latest 304 k Installing for dependencies: libXaw x86_64 1.0.12-5.el7 ol7_latest 190 k Transaction Summary ================================================================================= Install 1 Package (+1 Dependent package) Total download size: 494 k Installed size: 1.2 M Downloading packages: (1/2): libXaw-1.0.12-5.el7.x86_64.rpm | 190 kB 00:00:00 (2/2): xorg-x11-apps-7.7-6.el7.x86_64.rpm | 304 kB 00:00:00 --------------------------------------------------------------------------------- Total 690 kB/s | 494 kB 00:00:00 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : libXaw-1.0.12-5.el7.x86_64 1/2 Installing : xorg-x11-apps-7.7-6.el7.x86_64 2/2 Verifying : libXaw-1.0.12-5.el7.x86_64 1/2 Verifying : xorg-x11-apps-7.7-6.el7.x86_64 2/2 Installed: xorg-x11-apps.x86_64 0:7.7-6.el7 Dependency Installed: libXaw.x86_64 0:1.0.12-5.el7 Complete! |
After installing the xorg-x11-apps library packages, you can retry running the Oracle installer. You should now see the following successful message set:
Starting Oracle Universal Installer... Checking Temp space: must be greater than 500 MB. Actual 30809 MB Passed Checking swap space: must be greater than 150 MB. Actual 3967 MB Passed Checking monitor: must be configured to display at least 256 colors. Actual 16777216 Passed Preparing to launch Oracle Universal Installer from /tmp/OraInstall2016-06-01_01-50-54AM. Please wait ... |
As always, I hope this helps my students and anybody looking for a solution to a less than explicit error message.
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