Commit feda7f63 authored by nimrod's avatar nimrod
Browse files

Add docker remote sub-command. 

Add the docker remote sub-command (actually the _docker-remote script
but can be invoked as a sub-command with the wrapper script). It creates
a local socket that's forwarded to the dockerd socket on the remote host
via ssh. Requires OpenSSH 6.7 or later (for Unix socket forwarding and
%C token. Typical invocation would be `$(docker remote
host.domain.example)`. A blog post will follow.
parent b2ec8c03

Documents/bin/_docker-remote

0 → 100755
+24 −0
Original line number Diff line number Diff line 
#!/bin/sh

set -eu



[ -n "$1" ] || { echo "You must specify host." >> /dev/stderr; exit 1; }

host="$1"

localsocket="$HOME/.ssh/docker_$host.sock"

ssh="ssh -fnNTS ~/.ssh/%C.sock"



# Check for exiting forward

if ! $ssh -O check -L "$localsocket:/var/run/docker.sock" "$host" 2> /dev/null

then



    # Delete socket if it exists

    [ ! -S "$localsocket" ] || rm "$localsocket"



    # Open SSH ControlMaster

    $ssh -o ExitOnForwardFailure=no -o ControlMaster=auto -o ControlPersist=0 "$host"



    # Forward socket

    $ssh -O forward -L "$localsocket:/var/run/docker.sock" "$host"

fi



# Echo the DOCKER_HOST export command, for eval'ing.

echo "export DOCKER_HOST=unix://$localsocket"