Linux系统中Fail2ban是一款保护服务器免受网络攻击的工具，Fail2ban可以通过黑名单来禁止IP访问。既然有被禁止的IP，那么问题来了，CentOS系统如何把IP从Fail2ban黑名单中移除。

如何列出被禁止的 IP要查看所有被禁止的 ip 地址，运行下面的命令：

# iptables -L

Chain INPUT （policy ACCEPT）

target prot opt source destination

f2b-AccessForbidden tcp -- anywhere anywhere tcp dpt:http

f2b-WPLogin tcp -- anywhere anywhere tcp dpt:http

f2b-ConnLimit tcp -- anywhere anywhere tcp dpt:http

f2b-ReqLimit tcp -- anywhere anywhere tcp dpt:http

f2b-NoAuthFailures tcp -- anywhere anywhere tcp dpt:http

f2b-SSH tcp -- anywhere anywhere tcp dpt:ssh

f2b-php-url-open tcp -- anywhere anywhere tcp dpt:http

f2b-nginx-http-auth tcp -- anywhere anywhere multiport dports http，https

ACCEPT all -- anywhere anywhere state RELATED，ESTABLISHED

ACCEPT icmp -- anywhere anywhere

ACCEPT all -- anywhere anywhere

ACCEPT tcp -- anywhere anywhere tcp dpt:EtherNet/IP-1

ACCEPT tcp -- anywhere anywhere tcp dpt:http

REJECT all -- anywhere anywhere reject-with icmp-host-prohibited

Chain FORWARD （policy ACCEPT）

target prot opt source destination

REJECT all -- anywhere anywhere reject-with icmp-host-prohibited

Chain OUTPUT （policy ACCEPT）

target prot opt source destination

Chain f2b-NoAuthFailures （1 references）

target prot opt source destination

REJECT all -- 64.68.50.128 anywhere reject-with icmp-port-unreachable

REJECT all -- 104.194.26.205 anywhere reject-with icmp-port-unreachable

RETURN all -- anywhere anywhere

如何从 Fail2ban 中移除 IP

# iptables -D f2b-NoAuthFailures -s banned_ip -j REJECT

以上就是CentOS系统把IP从Fail2ban黑名单中移除的方法了，把IP地址从Fail2ban黑名单中移除了以后，也就解除了该IP对服务器访问的限制。