Merge pull request #3303 from crosbymichael/add-host-flag

Add DOCKER_HOST env var for client

docs/sources/commandline/cli.rst

@@ -52,6 +52,18 @@ To set the DNS server for all Docker containers, use ``docker -d -dns 8.8.8.8``.
 
 To run the daemon with debug output, use ``docker -d -D``.
 
+The docker client will also honor the ``DOCKER_HOST`` environment variable to set
+the ``-H`` flag for the client.  
+
+::
+ 
+        docker -H tcp://0.0.0.0:4243 ps
+        # or
+        export DOCKER_HOST="tcp://0.0.0.0:4243"
+        docker ps
+        # both are equal
+
+
 .. _cli_attach:
 
 ``attach``