最近，我尝试重新启动Fail2ban，但收到了错误，导致无法启动......我收到的完整错误systemctl status fail2ban如下：
Jan 03 18:27:02 nerdofcode.com systemd[1]: fail2ban.service: Control process exited, code=exited status=255
Jan 03 18:27:02 nerdofcode.com systemd[1]: Failed to start Fail2Ban Service.
Jan 03 18:27:02 nerdofcode.com systemd[1]: fail2ban.service: Unit entered failed state.
Jan 03 18:27:02 nerdofcode.com systemd[1]: fail2ban.service: Failed with result 'exit-code'.
Jan 03 18:27:02 nerdofcode.com systemd[1]: fail2ban.service: Service hold-off time over, scheduling restart.
Jan 03 18:27:02 nerdofcode.com systemd[1]: Stopped Fail2Ban Service.
Jan 03 18:27:02 nerdofcode.com systemd[1]: fail2ban.service: Start request repeated too quickly.
Jan 03 18:27:02 nerdofcode.com systemd[1]: Failed to start Fail2Ban Service.
Jan 03 18:27:02 nerdofcode.com systemd[1]: fail2ban.service: Unit entered failed state.
Jan 03 18:27:02 nerdofcode.com systemd[1]: fail2ban.service: Failed with result 'exit-code'.
的完整输出cat /var/log/fail2ban.log为：
2018-01-03 18:06:28,337 fail2ban.server [25119]: INFO
Exiting Fail2ban
我将非常感激针对此问题的任何建议或解决方案。
答案1
错误很可能已被记录下来，/var/log/fail2ban.log但是您也可以通过运行查看问题所在fail2ban-client -x start，并获得一些描述性信息。
就我的情况来说，这是一个尚不存在的进出口拒绝日志。
感谢@bistoco 对该问题的评论。
答案2
错误未按/var/log/fail2ban.log其他地方的建议登录。您最好提前停止该fail2ban过程。然后systemd执行以下操作：
sudo /usr/bin/fail2ban-client stop
就我的情况而言，它甚至没有运行，所以在那之后我手动启动它fail2ban，最后它给了我错误：
$ sudo /usr/bin/fail2ban-client stop
RROR Failed to access socket path: /var/run/fail2ban/fail2ban.sock. Is fail2ban running?
$ sudo /usr/bin/fail2ban-client -x start
ERROR No file(s) found for glob /var/log/apache2/*error.log
ERROR Failed during configuration: Have not found any log file for apache-shellshock jail
我继续修正了apache-shellshock说明/etc/fail2ban/jail.local并重新启动fail2ban，它就起作用了。