记一次死坑，mongodb无法启动报错 reason: errno:111 Connection refused

女爷i 2022-05-12 04:14 906阅读 0赞

这个问题是真，，，，，，，哎，不说了。

过程如下：

mongodb启动报错

1.  \[thread1\] Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: errno:111 Connection refused
2.  \[thread1\] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed

然后journalctl -xe看一下详情

1.  localhost.localdomain polkitd\[686\]: Unregistered Authentication Agent for unix-process:7798:588850 (system bus name
2.  :1.165, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale zh\_CN.UTF-8) (disconnected from bus)
3.   localhost.localdomain mongod\[7804\]: about to fork child process, waiting until server is ready for connections.
4.   localhost.localdomain mongod\[7804\]: forked process: 7806
5.   localhost.localdomain mongod\[7804\]: ERROR: child process failed, exited with error number 14
6.   localhost.localdomain systemd\[1\]: mongod.service: main process exited, code=exited, status=14/n/a
7.  localhost.localdomain systemd\[1\]: Unit mongod.service entered failed state.
8.   localhost.localdomain systemd\[1\]: mongod.service failed.
9.   localhost.localdomain polkitd\[686\]: Registered Authentication Agent for unix-process:7912:600595 (system bus name
10. :1.166 \[/usr/bin/pkttyagent --notify-fd 5 --fallback\], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale
11.  localhost.localdomain polkitd\[686\]: Unregistered Authentication Agent for unix-process:7912:600595 (system bus name
12. :1.166, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale zh\_CN.UTF-8) (disconnected from bus)
13.  localhost.localdomain yum\[8016\]: Erased: mongodb-org-3.2.21-1.el7.x86\_64
14.  localhost.localdomain systemd\[1\]: Reloading.
15.  localhost.localdomain yum\[8016\]: Erased: mongodb-org-server-3.2.21-1.el7.x86\_64
16. localhost.localdomain yum\[8016\]: Erased: mongodb-org-shell-3.2.21-1.el7.x86\_64
17.  localhost.localdomain yum\[8016\]: Erased: mongodb-org-mongos-3.2.21-1.el7.x86\_64
18.  localhost.localdomain yum\[8016\]: Erased: mongodb-org-tools-3.2.21-1.el7.x86\_64
19.  localhost.localdomain yum\[8198\]: Installed: mongodb-org-tools-3.2.21-1.el7.x86\_64
20.  localhost.localdomain yum\[8198\]: Installed: mongodb-org-mongos-3.2.21-1.el7.x86\_64
21.  localhost.localdomain yum\[8198\]: Installed: mongodb-org-shell-3.2.21-1.el7.x86\_64
22.  localhost.localdomain systemd\[1\]: Reloading.
23.  localhost.localdomain yum\[8198\]: Installed: mongodb-org-server-3.2.21-1.el7.x86\_64
24.  localhost.localdomain yum\[8198\]: Installed: mongodb-org-3.2.21-1.el7.x86\_64
25.  localhost.localdomain polkitd\[686\]: Registered Authentication Agent for unix-process:8253:634451 (system bus name
26. :1.167 \[/usr/bin/pkttyagent --notify-fd 5 --fallback\], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale
27. zh\_CN.UTF-8)
28.  localhost.localdomain systemd\[1\]: Starting SYSV: Mongo is a scalable, document-oriented database...

发现如下字段：

1.  pam\_unix(runuser:session): session opened for user mongod by (uid=0)
2.   pam\_unix(runuser:session): session closed for user mongod

看着像权限问题，推测数据文件权限不够，mongo 需要执行的文件有两个，分别是数据存储文件 `/var/lib/mongo`和日志存储文件 `/var/log/mongodb，`运行如下命令解决。

**chown -R mongod:mongod /var/lib/mongo  
chown -R mongod:mongod /var/log/mongodb**

然后重新journalctl -xe，发现报错信息变了出现如下字段

1.  Error starting mongod. /var/run/mongodb/mongod.pid exists

这句话比较好理解，因为这个进程的存在导致错误启动，只要删除即可，命令如下。

**rm /var/run/mongodb/mongod.pid exists**

再次启动发现还是失败，继续journalctl -xe。发现如下字段：

1.  mongod.service: control process exited, code=exited status=1
2.  Failed to start SYSV: Mongo is a scalable, document-oriented database

貌似是这个mongod.service文件有问题，于是通过命令搜索找出来，发现是空的，所以就编辑一下。

[Unit]
    Description=Mongodb
    After=network.target remote-fs.target nss-lookup.target
    
    [Service]
    Type=forking
    PIDFile=/www/server/mongodb/mongodb.pid
    ExecStartPre=/bin/rm -rf /www/server/mongodb/mongod.lock
    ExecStart=/bin/su - mongodb -c "/www/server/mongodb/bin/mongod --config /www/server/mongodb/mongodb.conf"
    ExecStop=/bin/kill -2 $MAINPID
    KillMode=process
    KillSignal=SIGQUIT
    TimeoutStopSec=5
    PrivateTmp=true
    
    [Install]
    WantedBy=multi-user.target

**vi /etc/systemd/system/multi-user.target.wants/mongod.service**

操作完发现还是不行，哇塞，于是这次去找log文件，看一下又是哪块小饼干在抽疯。

**vi /var/log/mongodb/mongod.log**

看到内容中的错误字段如下，

1.  \*\*\*aborting after fassert() failure
2.  2018-09-14T10:58:45.640+0800 I CONTROL  \[main\] \*\*\*\*\* SERVER RESTARTED \*\*\*\*\*
3.  2018-09-14T10:58:45.644+0800 I CONTROL  \[initandlisten\] MongoDB starting : pid=8710 port=27017 dbpath=/var/lib/mongo 64-bit host=localhost.localdomain
4.  2018-09-14T10:58:45.644+0800 I CONTROL  \[initandlisten\] db version v3.2.21
5.  2018-09-14T10:58:45.645+0800 I CONTROL  \[initandlisten\] git version: 1ab1010737145ba3761318508ff65ba74dfe8155
6.  2018-09-14T10:58:45.645+0800 I CONTROL  \[initandlisten\] OpenSSL version: OpenSSL 1.0.1e-fips 11 Feb 2013
7.  2018-09-14T10:58:45.645+0800 I CONTROL  \[initandlisten\] allocator: tcmalloc
8.  2018-09-14T10:58:45.645+0800 I CONTROL  \[initandlisten\] modules: none
9.  2018-09-14T10:58:45.645+0800 I CONTROL  \[initandlisten\] build environment:
10. 2018-09-14T10:58:45.645+0800 I CONTROL  \[initandlisten\]     distmod: rhel70
11. 2018-09-14T10:58:45.645+0800 I CONTROL  \[initandlisten\]     distarch: x86\_64
12. 2018-09-14T10:58:45.645+0800 I CONTROL  \[initandlisten\]     target\_arch: x86\_64
13. 2018-09-14T10:58:45.645+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" \} \}
14. 2018-09-14T10:58:45.660+0800 E NETWORK  \[initandlisten\] Failed to unlink socket file /tmp/mongodb-27017.sock errno:1 Operation not permitted
15. 2018-09-14T10:58:45.660+0800 I -        \[initandlisten\] Fatal Assertion 28578
16. 2018-09-14T10:58:45.660+0800 I -        \[initandlisten\]
    
    \*\*\*aborting after fassert() failure

发现连接不到一个socket文件，于是过去打开发现是空的~那就干脆直接删掉，让mongo启动时候自己去新建去。

**rm /tmp/mongodb-27017.sock**

然后再去启动，发现还是不行，好的吧那就继续journalctl -xe

1.  Error starting mongod. /var/run/mongodb/mongod.pid exists.

这鬼东西又出来了，好吧那就继续删除，刚呗，who怕who啊~

**rm /var/run/mongodb/mongod.pid**

然后再用systemctl start mongod ，发现这狗日的mongo终于运行了~~~