Detailed explanation of how to manually add a network bridge with Docker-Linux Operation and Maintenance-php.cn

This article mainly introduces how to add a custom network bridge in Docker. The editor thinks it is quite good. Now I will share it with you and give it as a reference. Let’s follow the editor and take a look.

The Docker service process will generate a bridge named docker0 when it is started. The container will be mounted to this bridge by default, but we can add docker startup parameters by adding -b Birdge or change dockerconfig fileto choose which bridge to use.

Operating system: centos7

Deletedocker0 bridge

service docker stop //关闭docker服务 ip link set dev docker0 down //关闭docker0网桥 ip link del dev docker0 //删除docker0网桥

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Customized bridge settings (/etc/sysconfig/network-scripts/ifcfg-br0 file)

DEVICE="br0" ONBOOT="yes" TYPE="Bridge" BOOTPROTO="static" IPADDR="10.10.10.20" NETMASK="255.255.255.0" GATEWAY="10.10.10.20" DEFROUTE="yes" NM_CONTROLLED="no"

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Restart the network service

service network restart

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View the network bridge

[black@test opt]$ brctl show bridge name bridge id STP enabled interfaces br0 8000.32e7297502be no virbr0 8000.000000000000 yes

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Next we need to restart docker, you can start the docker service The following two methods are used during the process:

The first one: -b parameter specifies the network bridge

[root@test opt]# docker -d -b br0 INFO[0000] Listening for HTTP on unix (/var/run/docker.sock) INFO[0000] [graphdriver] using prior storage driver "devicemapper" WARN[0000] Running modprobe bridge nf_nat failed with message: , error: exit status 1 INFO[0000] Loading containers: start. ...... INFO[0000] Loading containers: done. INFO[0000] Daemon has completed initialization INFO[0000] Docker daemon commit=786b29d execdriver=native-0.2 graphdriver=devicemapper version=1.7.1

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I don’t know why starting the docker service process like this will block the current terminal ( ︶︿︶), I had to reopen a terminal, and then run a container

[root@test shell]# docker run -ti --rm centos:latest [root@3c6874559411 /]# ifconfig eth0 Link encap:Ethernet HWaddr 02:42:0A:0A:0A:01 inet addr:10.10.10.1 Bcast:0.0.0.0 Mask:255.255.255.0 inet6 addr: fe80::42:aff:fe0a:a01/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:5 errors:0 dropped:0 overruns:0 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:418 (418.0 b) TX bytes:508 (508.0 b)

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The container successfully used the br0 bridge.

Second: Modify the /etc/sysconfig/docker file

I encountered a little problem when doing this operation, I modified/ etc/sysconfig/docker file

[root@test opt]# vi /etc/sysconfig/docker # /etc/sysconfig/docker # # Other arguments to pass to the docker daemon process # These will be parsed by the sysv initscript and appended # to the arguments list passed to docker -d other_args="-b br0"

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Then use service docker start to start the docker service, but other_args does not take effect. Under centos7, servicer docker start will still use the systemctl start docker.service command to run, so I opened /usr/lib/systemd/system/docker.service Check

[root@test opt]# vi /lib/systemd/system/docker.service [Unit] Description=Docker Application Container Engine Documentation=https://docs.docker.com After=network.target docker.socket Requires=docker.socket [Service] ExecStart=/usr/bin/docker -d -H fd:// MountFlags=slave LimitNOFILE=1048576 LimitNPROC=1048576 LimitCORE=infinity [Install] WantedBy=multi-user.target

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and find that the ExecStart item does not have running parameters, so I changed ExecStart to /usr/bin/docker -d -b br0 -H fd:/ /, run the docker service, start a container and find that the br0 bridge can be used successfully.

I saw a better method on the Internet, change docker.service to the following

[black@test ~]$ vi /usr/lib/systemd/system/docker.service [Unit] Description=Docker Application Container Engine Documentation=https://docs.docker.com After=network.target docker.socket Requires=docker.socket [Service] EnvironmentFile=-/etc/sysconfig/docker ExecStart=/usr/bin/docker -d $other_args -H fd:// MountFlags=slave LimitNOFILE=1048576 LimitNPROC=1048576 LimitCORE=infinity [Install] WantedBy=multi-user.target

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At this time, the parameters added in other_args will be effective.

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