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 --repairabout to fork child process, waiting until server is ready for connections.forked process: 9575child 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.pidrm -rf /data/db/mongod.lockrm -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 mongomongod 10839 1 0 10:47 ? 00:00:22 /usr/bin/mongod -f /etc/mongod.confroot 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 mongoroot 10222 1 5 10:37 ? 00:00:01 mongod --dbpath /var/lib/mongo --logpath /var/log/mongodb/mongod.log --forkroot 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 --shutdownproduced by yaong ！