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why I can't ping my docker container?

I run a docker container, which is named "redis". I want to use the "redis" container redis service, but I can't ping the container!

As the picture shows, my "redis" container is IP address is 172.17.0.15, but I can't connect to it.

I want to use the redis services. What is wrong with my configuration?

enter image description here

Solution

  • Because you're not on the same network. Containers are started on their own network by default, separate to the host's network.

    If you run:

    docker run --rm busybox ping 172.17.0.15

    You should find it works. Even better, you can link containers and refer to them by name:

    $ docker run -d --name redis redis
$ docker run --link redis:redis redis redis-cli -h redis ping
PONG

    If you really want to access redis from your host, just publish a port through to the host:

    $ docker run -d -p 6379:6379 redis

    You should now be able to reach it at localhost:6379 on the host.