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  • centos 下修改docker网络配置
By admin | 1:03 AM CST, Sun March 12, 2017

事情起因:

在为客户使用docker运行php-fpm的时候,发现有的可以正常连接服务器,有的不可以。经过诊断发现客户端的ip网段和docker创建的默认docker0网卡网段冲突。

docker0默认的网络一般都是172.17.0.1/24或192.168.0.1/24。如果客户端的ip是172.17.111.1,则这时候访问基于docker部署的应用的时候,会遇到网络问题。


解决的方案,有两种。

1:使用host模式运行docker,但是需要删除默认的docker0虚拟网卡。在下次docker daemon重新启动的时候,又会重新创建这个docker0的虚拟网卡。

2:另一种解决方式,就是修改默认的docker0网络配置,使用另外的网段给docker使用。


如下步骤,是基于方案二的解决步骤,亲测可行。

#停止docker服务器,并删除docker0网卡
sudo systemctl stop docker
sudo ip link set dev docker0 down
sudo brctl delbr docker0

# 创建自定义bridge0网络,网段为10.255.254.1/24
sudo brctl addbr bridge0
sudo ip addr add 10.255.254.1/24 dev bridge0
sudo ip link set dev bridge0 up
#sudo ip link set dev bridge0 down ; sudo brctl delbr bridge0

# 确认网卡已经运行
ip addr show bridge0

# 创建docker运行的配置文件(如果文件夹不存在,手工创建)
sudo mkdir /etc/systemd/system/docker.service.d
sudo vi /etc/systemd/system/docker.service.d/docker.conf##输入如下内容

[Service]
EnvironmentFile=-/etc/sysconfig/docker
ExecStart=
ExecStart=/usr/bin/dockerd $OPTIONS \
          $DOCKER_STORAGE_OPTIONS \
          $DOCKER_NETWORK_OPTIONS \
          $BLOCK_REGISTRY \
          $INSECURE_REGISTRY
          
# 修改docker服务启动默认绑定网卡为bridge0
echo 'DOCKER_NETWORK_OPTIONS="-b=bridge0"' >> /etc/sysconfig/docker

sudo systemctl daemon-reload

sudo systemctl restart docker


参考链接:

https://opskumu.gitbooks.io/docker/content/chapter6.html

http://www.6san.com/603/

https://docs.docker.com/engine/admin/systemd/#custom-docker-daemon-options


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