启动 MongoDB 以后就报下面的错误：
Starting mongod: Wed May 29 16:32:31.518 Wed May 29 16:32:31.518 warning: 32-bit servers don't have journaling enabled by default. Please use --journal if you want durability. Wed May 29 16:32:31.518 about to fork child process, waiting until server is ready for connections. forked process: 17684 all output going to: /var/log/mongo/mongod.log ERROR: child process failed, exited with error number 100 [失败]
错误提示为：ERROR: child process failed, exited with error number 100
没有正常关闭 MongoDB 服务,导致MongoDB 被锁，删除掉 MongoDB 里的 mongod.lock 文件，重新启动服务即可。
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