DOCKER_OPTS do not work in config file /etc/default/docker

Question

I have changed /etc/default/docker with DOCKER_OPTS=\"-H tcp://127.0.0.1:2375 -H unix:///var/run/docker.sock\" (docker version 1.4.1 in ubuntu 14.0

Answer 1

After checking docker source code (config.go and flags.go), I would say that the options you can pass in $DOCKER_OPTS are options for docker itself, and -H or --host is an option for docker daemon. As a workaround to solve your problem, you can edit the init script file you are using to include the -H option there. For example:

• If you are using upstart init system, edit the file /etc/init/docker.conf changing the exec line with exec "$DOCKER" -H "tcp://127.0.0.1:2375" -H "unix:///var/run/docker.sock" -d $DOCKER_OPTS
• If you are using sysvinit init system, edit the file /etc/init.d/docker changing the starting lines with something like:

Use this command:

start-stop-daemon --start --background \
    --no-close \
    --exec "$DOCKER" \
    --pidfile "$DOCKER_SSD_PIDFILE" \
    --make-pidfile \
    -- \
        -H "tcp://127.0.0.1:2375" \
        -H "unix:///var/run/docker.sock" \
        -d -p "$DOCKER_PIDFILE" \
        $DOCKER_OPTS >> \
        "$DOCKER_LOGFILE" 2>&1 
    log_end_msg $?
    ;;