启动fail2ban的时候出现错误：
[root@iz2ze fail2ban]# systemctl status fail2ban
● fail2ban.service - Fail2Ban Service
Loaded: loaded (/usr/lib/systemd/system/fail2ban.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since 六 2023-05-20 10:55:20 CST; 1min 38s ago
Docs: man:fail2ban(1)
Process: 16545 ExecStart=/usr/bin/fail2ban-server -xf start (code=exited, status=255)
Process: 16543 ExecStartPre=/bin/mkdir -p /run/fail2ban (code=exited, status=0/SUCCESS)
Main PID: 16545 (code=exited, status=255)
5月 20 10:55:20 iz2zeimmhbueq systemd[1]: Starting Fail2Ban Service...
5月 20 10:55:20 iz2zeimmhbueq systemd[1]: Started Fail2Ban Service.
5月 20 10:55:20 iz2zeimmhbueq fail2ban-server[16545]: 2023-05-20 10:55:20,950 fail2ban [16545]: ERROR Failed during configuration: File contains no section headers.
5月 20 10:55:20 iz2zeimmhbueq fail2ban-server[16545]: file: /etc/fail2ban/jail.local, line: 1
5月 20 10:55:20 iz2zeimmhbueq fail2ban-server[16545]: ' [ssh-iptables]\n'
5月 20 10:55:20 iz2zeimmhbueq fail2ban-server[16545]: 2023-05-20 10:55:20,953 fail2ban [16545]: ERROR Async configuration of server failed
5月 20 10:55:20 iz2zeimmhbueq systemd[1]: fail2ban.service: main process exited, code=exited, status=255/n/a
5月 20 10:55:20 iz2zeimmhbueq systemd[1]: Unit fail2ban.service entered failed state.
5月 20 10:55:20 iz2zeimmhbueq systemd[1]: fail2ban.service failed.
这是因为配置文件多了个空格，删掉即可。
vi /etc/fail2ban/jail.local
把[ssh-iptables]前面的空格删掉。