MongoDB 3.2.9 fails to start as a service on CentOS - mongodb

Question

I am trying to start mongod as a service on CentOS:
mongod --version
db version v3.2.9
git version: 22ec9e93b40c85fc7cae7d56e7d6a02fd811088c
OpenSSL version: OpenSSL 1.0.1e-fips 11 Feb 2013
allocator: tcmalloc
modules: none
build environment:
distmod: rhel70
distarch: x86_64
target_arch: x86_64
CentOS Linux release 7.2.1511 (Core)
/etc/selinux/config:
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of three two values:
# targeted - Targeted processes are protected,
# minimum - Modification of targeted policy. Only selected processes are protected.
# mls - Multi Level Security protection.
SELINUXTYPE=targeted
mongod.conf:
systemLog:
destination: file
path: "/mnt/log/mongod.log"
logAppend: true
storage:
dbPath: "/mnt/data"
engine: wiredTiger
journal:
enabled: true
processManagement:
fork: true
pidFilePath: "/var/run/mongodb/mongod.pid"
net:
# bindIp: 127.0.0.1
port: 27017
replication:
replSetName: XXXX
security:
keyFile: "/usr/mongodb/mongodb-keyfile"
The issue states:
Starting mongod (via systemctl): Job for mongod.service failed because the control process exited with error code. See "systemctl status mongod.service" and "journalctl -xe" for details.
[FAILED]
journalctl -xe
...
Sep 20 13:10:55 ip-10-0-231-19.localdomain systemd[1]: Unit mongod.service entered failed state.
Sep 20 13:10:55 ip-10-0-231-19.localdomain systemd[1]: mongod.service failed.
Sep 20 13:10:55 ip-10-0-231-19.localdomain polkitd[9717]: Unregistered Authentication Agent for unix-process:26567:1630816 (system bus name :1.27, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
Sep 20 13:11:04 ip-10-0-231-19.localdomain sudo[26587]: centos : TTY=pts/1 ; PWD=/home/centos ; USER=root ; COMMAND=/bin/vi /etc/mongod.conf
The server starts using:
sudo mongod -f /etc/mongod.conf
I know that there was a bug opened regarding similar issue but the fix might be available in 3.2.7 already and besides it was related to the scenario when SELINUX=enforcing...
Please support.

Answer 1

Recently encountered a similar problem, but on FC26; here, the problem could be traced back to SELINUX and specifically the permissions on the custom dbPath directory.
After trying many things, I found that the following sequence helped resolve my problem:
MONGODB_DATADIR=/mnt/data
sudo chown -R mongodb:mongodb $MONGODB_DATADIR
sudo chmod -R 700 $MONGODB_DATADIR
SELinux settings:
sudo semanage port -a -t mongod_port_t -p tcp 27017
sudo semanage fcontext -a -t mongod_var_lib_t ${MONGODB_DATADIR}
sudo semanage fcontext -a -t mongod_var_lib_t ${MONGODB_DATADIR}/mongod.lock
sudo restorecon -v ${MONGODB_DATADIR}
You probably also have to add mongod_log_t to the custom log file location, /mnt/log/mongod.log, I did not modify that one on my end.

Answer 2

Actually, for me the fix was:
sudo chown -R mongod:mongod $MONGODB_DATADIR