linux中安裝mongoDB之后，啟動不了，出現下邊的錯誤，網上搜原因，很多說需要刪除.lock文件，需要bin/mongod --repair修復，但是都不成功，最后發現是配置文件中路徑問題。

[root@wqd mongodb]# bin/mongod -f single/mongod.conf about to fork child process, waiting until server is ready for connections. forked process: 8962 ERROR: child process failed, exited with error number 1 To see additional information in this output, start without the "--fork" option.

解決：
先用bin/mongod --repair去修復，看一些信息

[root@wqd mongodb]# bin/mongod --repair 2021-06-23T13:48:28.746+0800 I CONTROL [initandlisten] MongoDB starting : pid=8972ort=27017 dbpath=/data/db 64-bit host=wqd 2021-06-23T13:48:28.746+0800 I CONTROL [initandlisten] db version v4.0.10 2021-06-23T13:48:28.746+0800 I CONTROL [initandlisten] git version: c389e7f69f637f1ac3cc9fae843b635f20b766 2021-06-23T13:48:28.746+0800 I CONTROL [initandlisten] allocator: tcmalloc 2021-06-23T13:48:28.746+0800 I CONTROL [initandlisten] modules: none 2021-06-23T13:48:28.746+0800 I CONTROL [initandlisten] build environment: 2021-06-23T13:48:28.746+0800 I CONTROL [initandlisten] distarch: x86_64 2021-06-23T13:48:28.746+0800 I CONTROL [initandlisten] target_arch: x86_64 2021-06-23T13:48:28.746+0800 I CONTROL [initandlisten] options: { repair: true } 2021-06-23T13:48:28.746+0800 I STORAGE [initandlisten] exception in initAndListen:onExistentPath: Data directory /data/db not found., terminating 2021-06-23T13:48:28.746+0800 I CONTROL [initandlisten] now exiting 2021-06-23T13:48:28.746+0800 I CONTROL [initandlisten] shutting down with code:1

最重要的是倒數第三句exception in initAndListen: NonExistentPath: Data directory /data/db not found., terminating
配置文件中data/db路徑有問題
修改路徑從根目錄開始"/usr/local/mongodb/single/data/db"
全部配置如下：

再次啟動成功

總結

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