Linux mongod Service
The installation of MongoDB doesn’t do everything for you. In fact, the first time you start the mongod service, like this as the root user or sudoer user with the command:
service mongod start |
A sudoer user will be prompted for their password, like
A typical MongoDB instance raises the following errors:
Redirecting to /bin/systemctl start mongod.service [student@localhost cit425]$ mongo MongoDB shell version v3.4.11 connecting to: mongodb://127.0.0.1:27017 MongoDB server version: 3.4.11 Server has startup warnings: 2018-10-29T10:51:57.515-0600 I STORAGE [initandlisten] 2018-10-29T10:51:57.515-0600 I STORAGE [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine 2018-10-29T10:51:57.515-0600 I STORAGE [initandlisten] ** See http://dochub.mongodb.org/core/prodnotes-filesystem 2018-10-29T10:51:58.264-0600 I CONTROL [initandlisten] 2018-10-29T10:51:58.264-0600 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database. 2018-10-29T10:51:58.264-0600 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted. 2018-10-29T10:51:58.264-0600 I CONTROL [initandlisten] 2018-10-29T10:51:58.265-0600 I CONTROL [initandlisten] 2018-10-29T10:51:58.265-0600 I CONTROL [initandlisten] ** WARNING: soft rlimits too low. rlimits set to 15580 processes, 64000 files. Number of processes should be at least 32000 : 0.5 times number of files. |
You can fix this by following the MongoDB instructions for the Unix ulimit Settings, which will tell you to create a mongod file in the /etc/systemd/system directory. You should create this file as the root superuser. This is what you should put in the file:
[Unit] Description=MongoDB Documentation=man:mongo [Service] # Other directives omitted # (file size) LimitFSIZE=infinity # (cpu time) LimitCPU=infinity # (virtual memory size) LimitAS=infinity # (locked-in-memory size) LimitMEMLOCK=infinity # (open files) LimitNOFILE=64000 # (processes/threads) LimitNPROC=64000 |
Then, you should be able to restart the mongod service without any warnings with this command:
service mongod restart |
As always, I hope this helps somebody.
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