Centos 7: Mongodb cannot boot itself

preface

The first mongodb you download has bug, so you need to manually use fix yourself. This is only a problem for a specific version, but not for all versions.

SeLinux

Also, 1 must set selinux to disabled or permissive

Problem description

sudo systemctl status mongod.service

Seeing that the service isn't working, open the log file:

cat /var/log/mongodb/mongod.log

The following problem occurs because the pid file cannot be created

***** SERVER RESTARTED *****
 ERROR: Cannot write pid file to /var/run/mongodb/mongod.pid: No such file or directory

The Centos7 system cleans up one of the items under /var/run every time, so the next time it is restarted, there is no good way to handle this file, as systemd boot is just a command:

/usr/bin/mongod --quiet -f /etc/mongod.conf run

Treatment scheme

Create a permanent file path and the pid file yourself

Modify the pid path in configuration file /etc/ mongod.conf and then modify the path of the systemd entry.

Specific operation

1. Create the file and modify the permissions

[azuo1228@ecs-ee2fe26e /]$ sudo mkdir /mongod
[azuo1228@ecs-ee2fe26e /]$ sudo touch /mongod/mongod.pid
[azuo1228@ecs-ee2fe26e /]$ sudo chown -R mongod:mongod /mongod

2. Modify the configuration

[azuo1228@ecs-ee2fe26e /]$ sudo vim /etc/mongod.conf

Put the inside:

pidFilePath: /var/run/mongodb/mongod.pid

Modify to create file:

pidFilePath: /mongod/mongod.pid

3. Modify the systemd entry

[azuo1228@ecs-ee2fe26e ~]$ sudo vim /etc/systemd/system/multi-user.target.wants/mongod.service

Put the inside:

PIDFile=/var/run/mongodb/mongod.pid

Modify the path to the specified file:

cat /var/log/mongodb/mongod.log

0

4. reload systemd

cat /var/log/mongodb/mongod.log

1

5. Boot up the mongod or reboot

cat /var/log/mongodb/mongod.log

2

6. Check status

[azuo1228@ecs-ee2fe26e ~]$ sudo systemctl status mongod.service

NOTE 1:

mongo. conf will not be updated after the mongodb installation is updated, however, it will be updated

cat /var/log/mongodb/mongod.log

4

Install a new one

cat /var/log/mongodb/mongod.log

5

So, also can't get up.

If you have the conf file set as above, you will need to modify the systemd file again.

NOTE 2:

The updated mongodb 3.4.1 has fixed this issue

cat /var/log/mongodb/mongod.log

6

conclusion