Unable to start MongoDB 3.0.2 service on CentOS 7
Solution 1
In case, anyone encountered the same issue with MongoDB startup, here is the thread of comments https://jira.mongodb.org/browse/SERVER-18439. This is scheduled to be fixed in 3.1
.
Solution 2
I'm guessing you're running a flavour of Linux that uses SELinux (RHEL or CentOS 7, perhaps?)
If so, the issue is that you don't have a permissive policy on your /mongo/
directory that permits access to daemons (like the mongod
service.)
From Wikipedia:
SELinux can potentially control which activities a system allows each user, process and daemon, with very precise specifications. However, it is mostly used to confine daemons[citation needed] like database engines or web servers that have more clearly defined data access and activity rights. This limits potential harm from a confined daemon that becomes compromised. Ordinary user-processes often run in the unconfined domain, not restricted by SELinux but still restricted by the classic Linux access rights
To check whether this is the issue, try this at the shell:
sudo setenforce 0
This should disable SELinux policies and allow the service to run.
For a more permanent solution, see https://wiki.centos.org/HowTos/SELinux
Solution 3
I ran into this problem and actually found a solution for me.
In short, mongodb 3.2 uses the user 'mongod' while older versions use 'mongodb'. Some of the files and directories were owned by 'mongodb' (the older user). Once I chmod'd them to the 'mongod' user, I was able to use systemctl to control the mongod process.
More specifically, it was the "/var/log/mongodb/*" files that had the wrong user ownership.
root@<HOST>:# ls -alh /var/log/mongodb
total 664K
drwxr-xr-x 2 mongod mongod 4.0K Oct 27 12:08 .
drwxr-xr-x. 22 root root 4.0K Oct 27 11:51 ..
-rw-r--r-- 1 mongodb mongodb 3.8K Oct 27 11:48 mongod.log
-rw-r--r-- 1 mongodb mongodb 19K Apr 14 2016 mongod.log.2016-04-14T18-29-34
-rw-r--r-- 1 mongodb mongodb 2.8K Apr 14 2016 mongod.log.2016-04-14T18-30-13
-rw-r--r-- 1 mongodb mongodb 12K Apr 14 2016 mongod.log.2016-04-14T22-27-27
-rw-r--r-- 1 mongodb mongodb 11K Apr 14 2016 mongod.log.2016-04-14T22-29-12
-rw-r--r-- 1 mongodb mongodb 5.6K Apr 18 2016 mongod.log-20160418.gz
-rw-r--r-- 1 mongodb mongodb 0 Apr 18 2016 mongod.log.2016-09-09T17-33-48
-rw-r--r-- 1 mongodb mongodb 3.6K Sep 9 11:34 mongod.log.2016-09-09T17-34-52
-rw-r--r-- 1 mongodb mongodb 23K Sep 9 11:49 mongod.log.2016-09-09T17-49-49
-rw-r--r-- 1 mongodb mongodb 5.0K Sep 9 11:55 mongod.log.2016-09-09T17-55-15
-rw-r--r-- 1 mongodb mongodb 5.0K Sep 9 12:02 mongod.log.2016-09-09T18-02-26
-rw-r--r-- 1 mongodb mongodb 5.0K Sep 9 12:13 mongod.log.2016-09-09T18-13-17
-rw-r--r-- 1 mongodb mongodb 5.0K Sep 9 12:25 mongod.log.2016-09-09T18-25-01
-rw-r--r-- 1 mongodb mongodb 5.2K Sep 9 12:47 mongod.log.2016-09-09T18-47-54
-rw-r--r-- 1 mongodb mongodb 5.0K Sep 9 12:52 mongod.log.2016-09-09T18-52-16
-rw-r--r-- 1 mongodb mongodb 5.0K Sep 9 12:54 mongod.log.2016-09-09T18-54-49
-rw-r--r-- 1 mongodb mongodb 5.0K Sep 9 13:01 mongod.log.2016-09-09T19-01-22
-rw-r--r-- 1 mongodb mongodb 3.0K Sep 9 13:03 mongod.log.2016-09-09T19-03-21
-rw-r--r-- 1 mongodb mongodb 215K Sep 9 14:25 mongod.log.2016-09-09T20-25-59
-rw-r--r-- 1 mongodb mongodb 281K Sep 10 03:42 mongod.log-20160910
-rw-r--r-- 1 mongodb mongodb 0 Sep 10 03:42 mongod.log.2016-10-27T17-42-42
-rw-r----- 1 mongod mongod 0 Sep 29 22:03 mongod.log.rpmnew
Notice the owner of the directory is 'mongod' (the new user) while the log files are all owned by 'mongodb' (the old user).
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Shashank Agrawal
Passionate about developing pixel-perfect and life-changing web & mobile applications, finding solutions to complex & unanswered problems and out of the most, loves "Coding". Founded a few companies- Cooee & Wiz Panda. Here at StackExchange sites to serve others but especially to learn more. Founder & CTO
Updated on October 28, 2020Comments
-
Shashank Agrawal over 3 years
We are setting up a MongoDB server for the production environment on Amazon EC2 instance, but could not able to start the service. I've followed this documentation for setup. Here are the steps, I've taken for setting up the server:
Added following to
/etc/yum.repos.d/mongodb-org-3.0.repo
[mongodb-org-3.0] name=MongoDB Repository baseurl=http://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.0/x86_64/ gpgcheck=0 enabled=1
And installed MongoDB 3.0.2 using
sudo yum install -y mongodb-org-3.0.2
Created three partitions for data, journal & log:
sudo mkdir /mongo sudo mkdir /mongo/data sudo mkdir /mongo/log sudo mkdir /mongo/journal
Created file system for three separate partitions:
sudo mkfs.ext4 /dev/xvdb sudo mkfs.ext4 /dev/xvdc sudo mkfs.ext4 /dev/xvdd
Created entry in
fstab
for reboot:echo '/dev/xvdb /mongo/data ext4 defaults,auto,noatime,noexec 0 0 /dev/xvdc /mongo/journal ext4 defaults,auto,noatime,noexec 0 0 /dev/xvdd /mongo/log ext4 defaults,auto,noatime,noexec 0 0' | sudo tee -a /etc/fstab
And mounted the partitions:
sudo mount /mongo/data sudo mount /mongo/journal sudo mount /mongo/log
Given the permissions and created link
sudo chown mongod:mongod /mongo/data /mongo/journal /mongo/log sudo ln -s /mongo/journal /mongo/data/journal
Configured
ulimit
& read ahead settings as given in the documentation link above. Verified permissions and partitions:[deployer@prod-mongo ~]$ df -h Filesystem Size Used Avail Use% Mounted on /dev/xvda1 8.0G 1.3G 6.8G 16% / devtmpfs 3.6G 0 3.6G 0% /dev tmpfs 3.5G 0 3.5G 0% /dev/shm tmpfs 3.5G 57M 3.4G 2% /run tmpfs 3.5G 0 3.5G 0% /sys/fs/cgroup /dev/xvdc 7.8G 36M 7.3G 1% /mongo/journal /dev/xvdb 150G 51M 149G 1% /mongo/data /dev/xvdd 3.9G 16M 3.6G 1% /mongo/log
Permissions:
[deployer@prod-mongo ~]$ ll / total 32 lrwxrwxrwx. 1 root root 7 Sep 29 2014 bin -> usr/bin dr-xr-xr-x. 4 root root 4096 Sep 29 2014 boot drwxr-xr-x. 17 root root 2860 May 11 12:11 dev lrwxrwxrwx. 1 root root 7 Sep 29 2014 lib -> usr/lib lrwxrwxrwx. 1 root root 9 Sep 29 2014 lib64 -> usr/lib64 drwxr-xr-x. 2 root root 6 Jun 10 2014 mnt drwxr-xr-x. 5 mongod mongod 41 May 11 05:06 mongo drwxr-xr-x. 21 root root 660 May 11 12:47 run lrwxrwxrwx. 1 root root 8 Sep 29 2014 sbin -> usr/sbin
Inside
/mongo
[deployer@prod-mongo ~]$ ll /mongo/ total 12 drwxr-xr-x. 3 mongod mongod 4096 May 11 07:33 data drwxr-xr-x. 3 mongod mongod 4096 May 11 07:31 journal drwxr-xr-x. 3 mongod mongod 4096 May 11 08:58 log
After changing the configurations inside
/etc/mongodb.conf
logpath=/mongo/log/mongod.log dbpath=/mongo/data
and when I'm doing:
sudo service mongod start
, I'm getting this error:Starting mongod (via systemctl): Job for mongod.service failed. See 'systemctl status mongod.service' and 'journalctl -xn' for details. [FAILED]
Further logging:
[deployer@prod-mongo ~]$ sudo systemctl status mongod.service mongod.service - SYSV: Mongo is a scalable, document-oriented database. Loaded: loaded (/etc/rc.d/init.d/mongod) Active: failed (Result: exit-code) since Tue 2015-05-12 04:42:10 UTC; 42s ago Process: 22881 ExecStart=/etc/rc.d/init.d/mongod start (code=exited, status=1/FAILURE) May 11 04:42:10 ip-xx-xx-xx-xx.local runuser[22887]: pam_unix(runuser:session): session opened for user mongod by (uid=0) May 11 04:42:10 ip-xx-xx-xx-xx.localdomain runuser[22887]: pam_unix(runuser:session): session closed for user mongod May 11 04:42:10 ip-xx-xx-xx-xx.local mongod[22881]: Starting mongod: [FAILED] May 11 04:42:10 ip-xx-xx-xx-xx.local systemd[1]: mongod.service: control process exited, code=exited status=1 May 11 04:42:10 ip-xx-xx-xx-xx.local systemd[1]: Failed to start SYSV: Mongo is a scalable, document-oriented database.. May 11 04:42:10 ip-xx-xx-xx-xx.local systemd[1]: Unit mongod.service entered failed state.
I've followed various articles and blog posts and StackExchange answers but didn't get any solution. Am I missing something?
Update: If I'm directly running the
mongodb
service from the normal user something like this:sudo mongod --logpath ~/mongod.log --dbpath ~/mongodata
, then this service is starting properly.We tried changing the path of the
pid
file to another directory, that didn't help either.