Usually, application containers (this is a general term for docker, rkt, and other types of containers) do not have etcdctl or even curl installed by default. Installing curl is much easier than installing etcdctl.
For our example, we will use the Alpine Linux docker image, which is very small in size and will not take much time to pull from the docker registry:
Firstly, we need to check the
docker0interface IP, which we will use withcurl:$ echo"$(ifconfig docker0 | awk'/\<inet\>/ { print $2}'):2379" 10.1.42.1:2379
Let's run the
dockercontainer with abashshell:$ docker run -it alpine ashWe should see something like this in Command Prompt:
/ #.As
curlis not installed by default on Alpine Linux, we need to install it:$ apk update&&apk add curl $ curl -L http://10.1.42.1:2379/v2/keys/ {"action":"get","node":{"key":"/","dir":true,"nodes":[{"key":"/coreos.com","dir":true,"modifiedIndex":3,"createdIndex":3}]}}
Repeat steps...