Docker问题：容器互连时访问宿主机出现“No route to host”的问题

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Docker问题：容器互连时访问宿主机出现“No route to host”的问题

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问题：

环境：CentOS、离线安装的docker环境
场景：博主在用离线镜像tar包安装mysql后，运行并在Windows上用Navicat和java项目都可以连接上，但是将项目打包成镜像部署到服务器上启动时，报错了，两条错误信息：

• 1.The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
• 2.No route to host

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个人估计是网络配置的原因，创建docker服务后，docker会有一个默认的内部网络，172.17.0.1
查看网络信息，命令：ip a

[root@localhost server]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
    link/ether 02:42:93:3b:ac:9f brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever
    inet6 fe80::42:93ff:fe3b:ac9f/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

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解决方法：依次执行以下命令即可

nmcli connection modify docker0 connection.zone trusted

systemctl stop NetworkManager.service

firewall-cmd --permanent --zone=trusted --change-interface=docker0

systemctl start NetworkManager.service

nmcli connection modify docker0 connection.zone trusted

systemctl restart docker.service

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执行完上面的命令后，再启动前面创建的容器即可

参考博客：https://blog.****.net/iouczp/article/details/80300500

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相关博客：离线安装docker服务.

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