docker0网卡down影响

Posted 2023-03-28

首先docker网段冲突导致主机网络异常处理，可能是docker网桥导致主机路由表异常，定位了一下，果然如此，那么解决方法就很简单了。大概解释一下，docker安装以后会在主机上创建一个虚拟网卡-docker0，而我们启动的容器host网络以外，其他的都是通过docker0这个虚拟网卡经过物理网卡与外部通信的。这个虚拟网卡本身会有一个网段，一般是172.17.x.x，所以问题就明确了，因为docker0占用了这个网段，导致主机无法访问真是的网段机器。只要把docker0绑定的网段修改一下，就可以了. 参考技术A RCSB Protein Data Bank (RCSB PDB) enables breakthroughs in science and education by providing access and tools for exploration, visualization, and analysis of:

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1,106ModelArchive 参考技术B 原因是在启动docker容器的时候突然断开连接，然后就连接不上了。服务器网段是100.10.x.x，被访问机器是172.17.x.x。
后来琢磨可能是docker网桥导致主机路由表异常，定位了一下，果然如此，那么解决方法就很简单了。大概解释一下，docker安装以后会在主机上创建一个虚拟网卡-docker0，而我们启动的容器host网络以外，其他的都是通过docker0这个虚拟网卡经过物理网卡与外部通信的。这个虚拟网卡本身会有一个网段，一般是172.17.x.x，所以问题就明确了，因为docker0占用了这个网段，导致主机无法访问真是的网段机器。只要把docker0绑定的网段修改一下 参考技术C 当Docker进程启动时，会在主机上创建一个名为docker0的虚拟网桥，此主机上启动的Docker容器会连接到这个虚拟网桥上。

docker 网络设置桥接网卡

[[email protected] ~]# systemctl stop docker  [[email protected] ~]# ifconfig  docker0 down  [[email protected] ~]# brctl delbr  docker0  [[email protected] network-scripts]# cat ifcfg-br0  DEVICE=br0 ONBOOT=yes NM_CONTROLLED=no BOOTPROTO=static TYPE=Bridge IPADDR=192.168.56.12 NETMASK=255.255.255.0 GATEWAY=192.168.56.2 [[email protected] network-scripts]# cat ifcfg-eth0  TYPE=Ethernet BOOTPROTO=none IPV6INIT=no NAME=eth0 DEVICE=eth0 ONBOOT=yes BRIDGE=br0 [[email protected] network-scripts]#  systemctl restart network  [[email protected] network-scripts]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1     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: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP qlen 1000     link/ether 00:0c:29:ac:7e:6d brd ff:ff:ff:ff:ff:ff     inet6 fe80::20c:29ff:feac:7e6d/64 scope link         valid_lft forever preferred_lft forever 6: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP qlen 1000     link/ether 00:0c:29:ac:7e:6d brd ff:ff:ff:ff:ff:ff     inet 192.168.56.12/24 brd 192.168.56.255 scope global br0        valid_lft forever preferred_lft forever     inet6 fe80::20c:29ff:feac:7e6d/64 scope link         valid_lft forever preferred_lft forever [[email protected]de2 network-scripts]#  vi  /etc/sysconfig/docker OPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false -b=br0' systemctl restart  network pipework的安装 wget https://github.com/jpetazzo/pipework/archive/master.zip unzip master.zip cp pipework-master/pipework  /usr/local/bin/ chmod +x /usr/local/bin/pipework  这里最好不要让docker自动获取ip，下次启动会有变化而且自动获取的ip可能会和物理网段中的ip冲突 docker run -itd --net=none --name=test centos7 /bin/bash 为test容器设置一个与桥接物理网络同地址段的[email protected]网关 pipework br0 test 192.168.56.11/[email protected]