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同一本地网络中不同主机上的 Docker 容器之间的通信

tag-icon • tag-icon linux networking wireless-networking ssh docker
同一本地网络中不同主机上的 Docker 容器之间的通信

我有两个 Docker 容器在两个不同的主机上运行：

  • 计算机 A（PC，使用以太网），ip 192.168.0.11 [Docker 容器在 172.17.0.2 上运行]，操作系统 Windows 7
  • 计算机 B（笔记本电脑，使用 WLAN），ip 192.168.0.12 [Docker 容器在 172.17.0.2 上运行]，操作系统 Linux Ubuntu

我想以某种方式连接它们，以便它们可以相互通信（例如通过 ssh）。

我尝试通过以下方式运行容器来“链接”它们：

docker run --name master_node --rm -it branislava/ubuntu1504java8:v1

docker run --rm -it --link master_node:master_node1 --name slave_node branislava/ubuntu1504java8:v1

正如评论中所建议的。这是可行的；容器可以通信 - 但只有当它们在同一台主机上运行时才可以。

对于在同一本地网络中不同机器上运行的容器，如何实现这一点？

答案1

以下是在同一本地网络中不同主机上建立同一镜像的 docker 容器之间的通信的 bash 脚本：

 # Firstly, we have to make a swarm
 # We have to discover ip address of the swarm leader (i.e. manager, master node)
 ifconfig
 # My master computer has ip 192.168.0.12 in the local network
 sudo docker swarm init --advertise-addr 192.168.0.12
 # Info about swarm
 sudo docker info
 # info about nodes (currently only one)
 sudo docker node ls
 # hostaname got it name automatically, by the host's name

 # adding new nodes to the swarm
 # ssh to the slave node (i.e. worker node) or type physically:
 # this command was generated after 
 # sudo docker swarm init --advertise-addr 192.168.0.12
 # on manager computer
 docker swarm join --token SWMTKN-1-55b12pdctfnvr1wd4idsuzwx34vcjwv9589azdgi0srgr3626q-01zjw639dyoy1ccgpiwcouqlk  192.168.0.12:2377

 # if one cannot remember or find this command
 # should type again on the manager host
 docker swarm join-token worker

 # ssh to the manager or type in directly:
 # (listing existing nodes in a swarm)
 sudo docker node ls
 # adding docker image as a process that will run in this containers
 # ssh to the manager or type in directly:
 # replicas will be the number of nodes
 # manager is also a worker node
 sudo docker service create --replicas 2 --name master_node image-name sleep infinity
 # I have to enter inside of the containers and set up some things before
 # running application, so I say `sleep infinity`
 # Else, this is not necessary.

 # what's up with the running process
 sudo docker service inspect --pretty etdo0z8o8timbsdmn3qdv381i
 # or
 sudo docker service inspect master_node
 # also, but only from manager
 sudo docker service ps master_node
 # see running containers (from worker or from manager)
 sudo docker ps

#  promote node from worker to manager
# `default` is the name of my worker node
sudo docker node promote default
#  denote node from manager to worker
sudo docker node demote default

# entering container, if needed
# getting container id with `sudo docker ps`
sudo docker exec -it bb923e379cbd  bash

# retrieving ip and port of the container
# I need this since my containers are communicating via ssh
sudo docker ps
sudo docker inspect --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' 5395cdd22c44

# removing processes from all nodes
sudo docker service rm master_node
# this command should say `no process`
sudo docker service inspect master_node

希望有人会发现这很有用。

答案2

向我们展示 docker 命令。

我认为你的命令缺少链接

这是一个例子

docker run --name=redmine -it --rm --link=postgresql-redmine:postgresql \
  --volume=/srv/docker/redmine/redmine:/home/redmine/data \
  sameersbn/redmine:3.3.1

答案3

我从来没有尝试过，但你可以完成其他电脑

docker run --name=Client -it --rm \
      --env='MEMCACHE_HOST=192.168.1.12' --env='MEMCACHE_PORT=22' \

答案4

我知道这是旧帖子。如果在容器上设置了 ssh 并且打开了端口 22，则需要找出用于外部连接的映射端口。这不是解决方案，但您可以尝试

在笔记本电脑 B 上运行此命令

  docker port master_node1 22

如果端口是开放的，它会给你一些端口号，否则会输出错误，例如如果上述命令的输出是

          0.0.0.0:1234

从笔记本电脑 A ssh 到笔记本电脑 B 上的容器

      ssh [email protected] -p 1234

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