The Docker just release 19.03 version of docker engine. There is new plugin coming along with this release context
What does it do?
This command helps users to manage contexts
The developers or operators are not limit to work on a single docker host or cluster. Typical you will have you local host on your laptop and other environment you have to manage or connect to. Previously, you will have to prefix your command with bash command to reset the DOCK_HOST environment variable in order to interact with various host like
DOCKET_HOST="some host" docker ps
Each host is your working context.
How it help?
Ok, with this plugin, you will have a tool to manage different context with ease.
you will create a context "remote" with
docker context create remote\ --docker host=remote address
now if you want to work with remote docker host to see what containers are running
firstly to switch the context
docker context use remote
Wait. There is one more trick.
Question: how you enable a docker host to able to securely connected to?
You: set certificate and .....
Ha!, there is an easy way to use context
docker context create secured\ --docker host=ssh:\\yoursshconfig
This take advantage of ssh user config assuming you has a setting in your .ssh/config file like
Host anyname HostName remote address User yourlogin Port 22 IdentityFile ~/.ssh/id_rsa
Now, you can use the same command to switch docker cli operate on remote docker host securely without worry about blabla.