MongoDB 过程 kill -9 之后导致服务起不来了

[root@yaong etc]# systemctl status mongod.service
● mongod.service - MongoDB Database Server
......
  Process: 9526 ExecStart=/usr/bin/mongod $OPTIONS (code=exited, status=14)
......
Aug 19 10:26:12 yaong systemd[1]: mongod.service: control process exited, code=exited status=14
......

从网上找了找相干材料，大抵说法是：mongo 内存治理很非凡，kill -9 很可能影响存库操作

如果不是在写磁盘的时候宕掉，能够通过 repair 命令进行修复，会失落最初一次写磁盘的时刻到宕掉时刻期间的数据

如果赶上写磁盘的时候过程宕掉，repair 也不能复原数据，很可能会失落掉全副数据

尝试进行修复

[root@yaong etc]# /usr/bin/mongod -f /etc/mongod.conf --repair
about to fork child process, waiting until server is ready for connections.
forked process: 9575
child process started successfully, parent exiting

再次查看服务状态

[root@yaong etc]# systemctl status mongod.service
● mongod.service - MongoDB Database Server
   Active: failed (Result: exit-code) since Thu 2021-08-19 10:27:05 CST; 6s ago
  Process: 9618 ExecStart=/usr/bin/mongod $OPTIONS (code=exited, status=1/FAILURE)
 ......
Aug 19 10:27:05 yaong systemd[1]: mongod.service: control process exited, code=exited status=1
......

燃鹅还是存在其余问题，鉴于库里没有存啥数据，通通干掉，重头再来

rm -rf /var/lib/mongo/*
rm -rf /var/log/mongodb/*
cat /var/run/mongodb/mongod.pid
rm -rf /data/db/mongod.lock
rm -rf /var/lib/mongo/mongod.lock

再次启动服务，服务就起来了

[root@yaong mongodb]# systemctl restart mongod
[root@yaong mongodb]# systemctl status mongod.service
● mongod.service - MongoDB Database Server
   Active: active (running) since Thu 2021-08-19 10:47:14 CST; 3s ago
     Docs: https://docs.mongodb.org/manual
  Process: 10836 ExecStart=/usr/bin/mongod $OPTIONS (code=exited, status=0/SUCCESS)
    ......
 Main PID: 10839 (mongod)
   CGroup: /system.slice/mongod.service
           └─10839 /usr/bin/mongod -f /etc/mongod.conf
                     
[root@yaong etc]# ps -ef | grep mongo
mongod   10839     1  0 10:47 ?        00:00:22 /usr/bin/mongod -f /etc/mongod.conf
root     15949  1627  0 12:25 pts/0    00:00:00 grep --color=auto mongo

至此，揭示大家进行 mongo 过程肯定要审慎，举荐三种较稳当的形式：

交互模式下：

use admin
db.shutdownServer()

mongo 命令：

mongod –shutdown

系统命令

kill

除了服务启动模式，还能够命令行后盾启动

mongod --dbpath /var/lib/mongo --logpath /var/log/mongodb/mongod.log --fork
[root@yaong etc]# ps -ef | grep mongo
root     10222     1  5 10:37 ?        00:00:01 mongod --dbpath /var/lib/mongo --logpath /var/log/mongodb/mongod.log --fork
root     10281  1627  0 10:38 pts/0    00:00:00 grep --color=auto mongo

与之对应的是进行过程的命令

mongod --dbpath /var/lib/mongo --logpath /var/log/mongodb/mongod.log --shutdown

produced by yaong！