我的服务器有时会被 apache 中的连接填满，卡在“发送回复”状态，需要我重新启动 apache。大多数情况下这是有效的，但有时我会在尝试重新启动 apache 时收到此错误：
Job for httpd.service failed because the control process exited with
error code. See "systemctl status httpd.service" and "journalctl -xe"
for details.
运行systemctl status httpd.service或journalctl -xe按照建议然后带回以下相关信息：
Nov 15 06:24:06 hostname.biologyreporter.com systemd-logind[874]:
Failed to remove runtime directory /run/user/1067: Device or resource busy
Nov 15 06:24:27 hostname.biologyreporter.com restartsrv_httpd[29484]:
[Fri Nov 15 06:24:27.255594 2019] [core:emerg] [pid 29509:tid 47498001208384]
(28) No space left on device: AH00023: Couldn't create the mpm-accept mutex
Nov 15 06:24:27 hostname.biologyreporter.com …