Docker容器跨主机通信--overlay

主机配置

A  45.77.250.9  CentOS 7 x64

B  66.42.55.131  CentOS 7 x64

1.A、B主机分别安装docker

yum install docker -y

A、B主机分别启动docker

systemctl start docker

检查docker安装成功

docker version

2.A主机安装consul

wget https://releases.hashicorp.com/consul/0.9.2/consul_0.9.2_linux_386.zip

解压

unzip consul_0.9.2_linux_386.zip

然后执行

mv consul /usr/bin
chmod +x /usr/bin/consul

启动consul

nohup consul agent -server -ui -bootstrap -data-dir /data/docker/consul -client=45.77.250.9 -bind=45.77.250.9 >> /var/log/consul.log 2>&1 &

3.A、B主机分别配置docker连接consul

A、B主机分别执行

mkdir -p /etc/systemd/system/docker.service.d
vi /etc/systemd/system/docker.service.d/env.conf

A主机编辑文件env.conf内容如下 

[Service]
ExecStart=
ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock --cluster-store consul://45.77.250.9:8500 --cluster-advertise 45.77.250.9:2375

B主机编辑文件env.conf内容如下

[Service]
ExecStart=
ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock --cluster-store consul://45.77.250.9:8500 --cluster-advertise 66.42.55.131:2375

重启docker

systemctl daemon-reload
systemctl restart docker

访问http://45.77.250.9:8500/ui/#/dc1/kv/docker/nodes/

4.A主机创建overlay网络

docker network create -d overlay overlay_2

查看网络创建成功

docker network ls

B主机查看overlay网络已同步到B主机

docker network ls

 

5.A、B主机分别导入镜像

cat ubuntu-16.04-x86_64.tar.gz | docker import - myubuntu

A主机创建运行容器ubuntu_1

docker run -itd --net overlay_2 --name ubuntu_1 myubuntu bash

B主机创建运行容器ubuntu_2

docker run -itd --net overlay_2 --name ubuntu_2 myubuntu bash

创建运行容器报错/usr/bin/docker-current: Error response from daemon: shim error: docker-runc not installed on system解决

执行

cp /usr/libexec/docker/docker-runc-current /usr/libexec/docker/docker-runc
docker rm -f $(docker ps -aq)

A主机查看容器ubuntu_1 IP 这里是10.0.0.2

docker inspect --format="{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}" ubuntu_1

B主机查看容器ubuntu_2 IP 这里是10.0.0.3

docker inspect --format="{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}" ubuntu_2

A主机进入ubuntu_1容器

docker exec -it ubuntu_1 bash

然后ping B主机ubuntu_2容器

ping 10.0.0.3

B主机进入ubuntu_2容器

docker exec -it ubuntu_2 bash

然后ping A主机ubuntu_1容器

ping 10.0.0.2