在CentOS 7上當(dāng)我們以類似下列命令將主機端口與容器端口映射時可能遇到無法訪問容器服務(wù)的問題
docker run --name web_a -p 192.168.1.250:803:80 -d web_a:beta1.0.0 .
由于docker在執(zhí)行此命令時，是向iptables注入了一條規(guī)則將主機803映射到容器80端口，但是CentOS 7中以firewalld服務(wù)替代了iptables。因此，上述命令的端口映射不會生效。
解決方法：首先觀察一下主機上的網(wǎng)卡信息，確認增加了一個docker0的虛擬網(wǎng)卡：
[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
使用如下命令確認容器實例得到的虛擬ip:
假設(shè)容器中的ip為172.17.0.2，接下來我們要為此IP做個NAT轉(zhuǎn)發(fā)規(guī)則，并讓firewalld服務(wù)處理此規(guī)則：
#主機端口請求轉(zhuǎn)發(fā)到容器（容器中的服務(wù)不要監(jiān)聽localhost而要監(jiān)聽容器分配的虛擬IP或者以0.0.0.0替代）
firewall-cmd --permanent --zone=public --add-masquerade 啟用端口NAT轉(zhuǎn)發(fā)
#將主機803端口請求轉(zhuǎn)發(fā)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
#重載規(guī)則
firewall-cmd --reload
#列出所有規(guī)則
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:
#重新啟動docker
systemctl restart docker
#重新啟動容器
docker start web_a
經(jīng)上述操作，就能以主機IP:803訪問容器上的80端口的服務(wù)，并不需要關(guān)閉firewalld（很多網(wǎng)上的結(jié)論是換成iptables服務(wù)，實測不需要）。
總結(jié)
到此這篇關(guān)于在CentOS 7 上為docker配置端口轉(zhuǎn)發(fā)以兼容firewall的解決方法的文章就介紹到這了,更多相關(guān)docker配置端口轉(zhuǎn)發(fā)以兼容firewall內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！
