在Centos 7上将mongodb作为服务运行时出错

我在Centos 7上安装了一个VPS，但当我尝试将MongoDB作为服务运行时，会收到以下消息：

Apr 06 03:11:46 server.backupserver.com systemd[1]: Starting MongoDB Database Server...
Apr 06 03:11:46 server.backupserver.com mongod[3767]: about to fork child process, waiting until server is ready for connections.
Apr 06 03:11:46 server.backupserver.com mongod[3767]: forked process: 3769
Apr 06 03:11:49 server.backupserver.com systemd[1]: Can't open PID file /var/run/mongodb/mongod.pid (yet?) after start: Too many levels of symbolic links
Apr 06 03:13:17 server.backupserver.com systemd[1]: mongod.service start operation timed out. Terminating.
Apr 06 03:13:17 server.backupserver.com systemd[1]: Failed to start MongoDB Database Server.
Apr 06 03:13:17 server.backupserver.com systemd[1]: Unit mongod.service entered failed state.
Apr 06 03:13:17 server.backupserver.com systemd[1]: mongod.service failed.

我测试了另一个主题的回答，但它还不起作用

var/run/mongodb目录和文件mongod.pid具有正确的权限和用户mongod

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请帮帮忙

这似乎是一条信息。要排除故障，请执行以下操作：

从CentOS 7的原始码头工人、流浪者、虚拟箱等形象开始。 遵循规则。 如果成功，请按照VPS上的官方安装说明进行操作