在CentOS 7 上为docker配置端口转发以兼容firewall的解决方法

docker run --name web_a -p 192.168.1.250:803:80 -d web_a:beta1.0.0 .

[root@localhost /home]# ifconfig
docker0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
    inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
    inet6 fe80::42:5cff:fe0e:82f9 prefixlen 64 scopeid 0x20<link>
    ether 02:42:5c:0e:82:f9 txqueuelen 0 (Ethernet)
    RX packets 1288 bytes 1561177 (1.4 MiB)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 1594 bytes 108755 (106.2 KiB)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

enp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
    inet 192.168.1.250 netmask 255.255.255.0 broadcast 192.168.1.255
    inet6 fe80::76f4:9aea:4973:ec6c prefixlen 64 scopeid 0x20<link>
    inet6 240e:379:542:2800:8844:77ba:78dd:7 prefixlen 128 scopeid 0x0<global>
    inet6 240e:379:542:2811:3ead:218:ba68:38e6 prefixlen 64 scopeid 0x0<global>
    ether 74:d4:35:09:93:19 txqueuelen 1000 (Ethernet)
    RX packets 10166908 bytes 1221399579 (1.1 GiB)
    RX errors 0 dropped 3014 overruns 0 frame 0
    TX packets 982334 bytes 427296782 (407.5 MiB)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
    device interrupt 18

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
    inet 127.0.0.1 netmask 255.0.0.0
    inet6 ::1 prefixlen 128 scopeid 0x10<host>
    loop txqueuelen 1000 (Local Loopback)
    RX packets 1833650 bytes 450567722 (429.6 MiB)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 1833650 bytes 450567722 (429.6 MiB)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

vethecef228: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
    inet6 fe80::f425:f1ff:fe82:9c19 prefixlen 64 scopeid 0x20<link>
    ether f6:25:f1:82:9c:19 txqueuelen 0 (Ethernet)
    RX packets 234 bytes 1520113 (1.4 MiB)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 613 bytes 39809 (38.8 KiB)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

docker inspect web_a

#主机端口请求转发到容器（容器中的服务不要监听localhost而要监听容器分配的虚拟IP或者以0.0.0.0替代）
firewall-cmd --permanent --zone=public --add-masquerade 启用端口NAT转发
#将主机803端口请求转发到容器上的80端口
firewall-cmd --add-forward-port=port=803:proto=tcp:toaddr=172.17.0.2:toport=80 --permanent
#重载规则
firewall-cmd --reload
#列出所有规则
firewall-cmd --list-all
public (active)
 target: default
 icmp-block-inversion: no
 interfaces: enp2s0
 sources:
 services: ssh dhcpv6-client
 ports: 3306/tcp 80/tcp 21/tcp 5000/tcp 6379/tcp 900/tcp 801/tcp 802/tcp 6000/tcp 5002/tcp 90/tcp 9092/tcp 81/tcp 803/tcp
 protocols:
 masquerade: yes
 forward-ports: port=803:proto=tcp:toport=80:toaddr=172.17.0.2
 source-ports:
 icmp-blocks:
 rich rules:

#重新启动docker
systemctl restart docker
#重新启动容器
docker start web_a