MongoDB CentOS7 启动问题记录

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.

• Loaded: loaded (/etc/rc.d/init.d/mongod; bad; vendor preset: disabled)
  systemctl status mongod.service打印错误如下

● mongod.service - SYSV: Mongo is a scalable, document-oriented database.
   Loaded: loaded (/etc/rc.d/init.d/mongod; bad; vendor preset: disabled)
   Active: failed (Result: exit-code) since Thu 2019-03-21 10:52:22 CST; 16s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 41767 ExecStart=/etc/rc.d/init.d/mongod start (code=exited, status=1/FAILURE)

Mar 21 10:52:22 iZ8vb8vuru3z975hcpmh4rZ systemd[1]: Starting SYSV: Mongo is a scalable, document-oriented database....
Mar 21 10:52:22 iZ8vb8vuru3z975hcpmh4rZ runuser[41778]: pam_unix(runuser:session): session opened for user mongod by (uid=0)
Mar 21 10:52:22 iZ8vb8vuru3z975hcpmh4rZ runuser[41778]: pam_unix(runuser:session): session closed for user mongod
Mar 21 10:52:22 iZ8vb8vuru3z975hcpmh4rZ mongod[41767]: Starting mongod: [FAILED]
Mar 21 10:52:22 iZ8vb8vuru3z975hcpmh4rZ systemd[1]: mongod.service: control process exited, code=exited status=1
Mar 21 10:52:22 iZ8vb8vuru3z975hcpmh4rZ systemd[1]: Failed to start SYSV: Mongo is a scalable, document-oriented database..
Mar 21 10:52:22 iZ8vb8vuru3z975hcpmh4rZ systemd[1]: Unit mongod.service entered failed state.
Mar 21 10:52:22 iZ8vb8vuru3z975hcpmh4rZ systemd[1]: mongod.service failed.

解决办法：
将mongoDB添加到systemd

vim /usr/lib/systemd/system/mongod.service

[Unit]
Description=mongodb database

[Service]
User=mongod
Group=mongod
Environment="OPTIONS=--quiet -f /etc/mongod.conf"
ExecStart=/usr/bin/mongod $OPTIONS run
PIDFile=/var/run/mongodb/mongod.pid

[Install]
WantedBy=multi-user.target

建立链接
ln -s /usr/lib/systemd/system/mongod.service /etc/systemd/system/multi-user.target.wants/

重新加载systemctl
systemctl daemon-reload

• 将mongoDB添加到systemd后错误变为Loaded: loaded (/usr/lib/systemd/system/mongod.service; enabled; vendor preset: disabled)
  systemctl status mongod.service打印错误如下

● mongod.service
   Loaded: loaded (/usr/lib/systemd/system/mongod.service; enabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since Thu 2019-03-21 10:56:09 CST; 15s ago
  Process: 41857 ExecStart=/usr/bin/mongod --config /etc/mongod.conf (code=exited, status=14)

Mar 21 10:56:09 iZ8vb8vuru3z975hcpmh4rZ systemd[1]: Failed to start mongod.service.
Mar 21 10:56:09 iZ8vb8vuru3z975hcpmh4rZ systemd[1]: Unit mongod.service entered failed state.
Mar 21 10:56:09 iZ8vb8vuru3z975hcpmh4rZ systemd[1]: mongod.service failed.
Mar 21 10:56:09 iZ8vb8vuru3z975hcpmh4rZ systemd[1]: mongod.service holdoff time over, scheduling restart.
Mar 21 10:56:09 iZ8vb8vuru3z975hcpmh4rZ systemd[1]: Stopped mongod.service.
Mar 21 10:56:09 iZ8vb8vuru3z975hcpmh4rZ systemd[1]: start request repeated too quickly for mongod.service
Mar 21 10:56:09 iZ8vb8vuru3z975hcpmh4rZ systemd[1]: Failed to start mongod.service.
Mar 21 10:56:09 iZ8vb8vuru3z975hcpmh4rZ systemd[1]: Unit mongod.service entered failed state.
Mar 21 10:56:09 iZ8vb8vuru3z975hcpmh4rZ systemd[1]: mongod.service failed.

看完之后不明觉厉，这时候看一下mongo的log

tail -f /var/log/mongodb/mongod.log

信息如下

2019-03-21T10:56:09.405+0800 I CONTROL  [initandlisten]     distarch: x86_64
2019-03-21T10:56:09.405+0800 I CONTROL  [initandlisten]     target_arch: x86_64
2019-03-21T10:56:09.405+0800 I CONTROL  [initandlisten] options: { config: "/etc/mongod.conf", net: { bindIp: "127.0.0.1", port: 27017 }, processManagement: { fork: true, pidFilePath: "/var/run/mongodb/mongod.pid" }, storage: { dbPath: "/var/lib/mongo", journal: { enabled: true } }, systemLog: { destination: "file", logAppend: true, path: "/var/log/mongodb/mongod.log" } }
2019-03-21T10:56:09.428+0800 E NETWORK  [initandlisten] Failed to unlink socket file /tmp/mongodb-27017.sock errno:1 Operation not permitted
2019-03-21T10:56:09.428+0800 I -        [initandlisten] Fatal Assertion 28578
2019-03-21T10:56:09.428+0800 I -        [initandlisten] 

其中最关键的一句就是2019-03-21T10:56:09.428+0800 E NETWORK [initandlisten] Failed to unlink socket file /tmp/mongodb-27017.sock errno:1 Operation not permitted没有权限

查看一下/tmp/mongodb-27017.sock的读写权限

ls -l /tmp/mongodb-27017.sock 

发现该文件夹的所有者为root

srwx------ 1 root root 0 Mar 21 09:39 /tmp/mongodb-27017.sock

把所有者修改为mongod

chown mongod:mongod /tmp/mongodb-27017.sock

重新启动mongo

service mongod start

启动成功

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