Nginxが起動しなくなりました。nginx.service failed because a configured resource limit was exceeded

# systemctl start nginx.service

  Job for nginx.service failed because a configured resource limit was

  exceeded. See "systemctl status nginx.service" and "journalctl -xe"

  for details.

# systemctl status nginx.service

  ● nginx.service - nginx - high performance web server    Loaded:

  loaded (/usr/lib/systemd/system/nginx.service; enabled; vendor preset:

  disabled) 

     Active: failed (Result: resources) since

# journalctl -xe

  -- The result is failed.

  -- systemd[1]: Failed to start Cleanup of Temporary Directories.

  -- Subject: Unit systemd-tmpfiles-clean.service has failed

  -- Defined-By: systemd

  -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel

# systemctl status systemd-tmpfiles-clean.service

  ● systemd-tmpfiles-clean.service - Cleanup of Temporary Directories   

  Loaded: loaded

  (/usr/lib/systemd/system/systemd-tmpfiles-clean.service; static;

  vendor preset: disabled)    Active: failed (Result: start-limit) since

  日付; 1 day 2h ago

       Docs: man:tmpfiles.d(5)

             man:systemd-tmpfiles(8)   Process: 12692 ExecStart=/usr/bin/systemd-tmpfiles --clean (code=exited,

  status=0/SUCCESS)  Main PID: 12692 (code=exited, status=0/SUCCESS)

  日付 systemd[1]: Starting Cleanup of Temporary Directories...  

# less /usr/lib/systemd/system/systemd-tmpfiles-clean.service

・編集した覚えはないので、多分デフォルトのままだと思います

  [Unit] Description=Cleanup of Temporary Directories

  Documentation=man:tmpfiles.d(5) man:systemd-tmpfiles(8)

  DefaultDependencies=no Conflicts=shutdown.target

  After=systemd-readahead-collect.service

  systemd-readahead-replay.service local-fs.target time-sync.target

  Before=shutdown.target

  [Service] Type=oneshot ExecStart=/usr/bin/systemd-tmpfiles --clean

  IOSchedulingClass=idle

環境

・Nginx

・CentOS7