PIDFile没有配置导致将mongodb配置成服务时启动失败

安装MongoDB，尝试配置成服务后，启动一直不成功

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# systemctl start mongod # systemctl status mongod ● mongod.service - High-performance, schema-free document-oriented database    Loaded: loaded (/usr/lib/systemd/system/mongod.service; enabled; vendor preset: disabled)    Active: inactive (dead) since 五 2021-10-29 18:14:10 CST; 4s ago      Docs: https://docs.mongodb.org/manual   Process: 3921 ExecStart=/usr/local/mongodb/bin/mongod $OPTIONS (code=exited, status=0/SUCCESS)  Main PID: 3921 (code=exited, status=0/SUCCESS)   10月 29 18:14:09 abce systemd[1]: Started High-performance, schema-free document-oriented database. 10月 29 18:14:09 abce mongod[3921]: about to fork child process, waiting until server is ready for connections. 10月 29 18:14:09 abce mongod[3921]: forked process: 3925 10月 29 18:14:10 abce mongod[3921]: child process started successfully, parent exiting

　　

启动的时候，进程会自动被kill掉。

 

看看mongodb的日志可以看到，会自动发送kill信号

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{"t":{"$date":"2021-10-29T18:14:10.140+08:00"},"s":"I",  "c":"CONTROL",  "id":23377,   "ctx":"SignalHandler","msg":"Received signal","attr":{"signal":15,"error":"Terminated"}} {"t":{"$date":"2021-10-29T18:14:10.140+08:00"},"s":"I",  "c":"CONTROL",  "id":23378,   "ctx":"SignalHandler","msg":"Signal was sent by kill(2)","attr":{"pid":1,"uid":0}} {"t":{"$date":"2021-10-29T18:14:10.140+08:00"},"s":"I",  "c":"CONTROL",  "id":23381,   "ctx":"SignalHandler","msg":"will terminate after current cmd ends"}

　　

原因和解决方法：
在/usr/lib/systemd/system/mongod.service文件中添加

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1	PIDFile=mongod.pid(实际pid文件名和路径)