MongoDB Failed to unlink socket file /tmp/mongodb-27017

Upgraded MongoDB and unable to start the mongod process, review the /var/log/mongodb/mongod.log file, and found the following error messages :

2017-08-24T03:57:21.289-0400 I CONTROL  [initandlisten] MongoDB starting : pid=31927 port=27017 dbpath=/var/lib/mongodb3 64-bit host=hcompass
2017-08-24T03:57:21.289-0400 I CONTROL  [initandlisten] db version v3.2.16
2017-08-24T03:57:21.289-0400 I CONTROL  [initandlisten] git version: 056bf45128114e44c5358c7a8776fb582363e094
2017-08-24T03:57:21.289-0400 I CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.0.1t  3 May 2016
2017-08-24T03:57:21.289-0400 I CONTROL  [initandlisten] allocator: tcmalloc
2017-08-24T03:57:21.289-0400 I CONTROL  [initandlisten] modules: none
2017-08-24T03:57:21.289-0400 I CONTROL  [initandlisten] build environment:
2017-08-24T03:57:21.289-0400 I CONTROL  [initandlisten]     distmod: debian71
2017-08-24T03:57:21.289-0400 I CONTROL  [initandlisten]     distarch: x86_64
2017-08-24T03:57:21.289-0400 I CONTROL  [initandlisten]     target_arch: x86_64
2017-08-24T03:57:21.289-0400 I CONTROL  [initandlisten] options: { config: "/etc/mongod.conf", net: { bindIp: "127.0.0.1,192.168.x.x" }, storage: { dbPath: "/var/lib/mongodb3" }, systemLog: { destination: "file", logAppend: true, path: "/var/log/mongodb/mongod.log" } }
2017-08-24T03:57:21.311-0400 E NETWORK  [initandlisten] Failed to unlink socket file /tmp/mongodb-27017.sock errno:1 Operation not permitted
2017-08-24T03:57:21.311-0400 I -        [initandlisten] Fatal Assertion 28578
2017-08-24T03:57:21.311-0400 I -        [initandlisten]
***aborting after fassert() failure

Check the /tmp/mongodb-27017.sock permission, owner is root?

$ ls -ls /tmp/mongodb-27017.sock
0 srwx------ 1 root root 0 Aug 24 03:56 /tmp/mongodb-27017.sock

P.S Debian 7 and MongoDB 2.6 –> upgraded to –> 3.2.16

Solution

To fix it, delete the /tmp/mongodb-27017.sock file manually and start the mongod process. Check the /tmp/mongodb-27017.sock permission again, the ownership is changed to the ‘mongodb’ user.

$ sudo rm -rf /tmp/mongodb-27017.sock
$ sudo service mongod start
[ok]
$ ls -lsah /tmp/mongodb-27017.sock
0 srwx------ 1 mongodb mongodb 0 Aug 24 04:01 /tmp/mongodb-27017.sock