Docker daemon not starting after adding the -H flag

I’m trying to use Docker Swarm, to do that I need to start the Docker daemon with the -H flag on each node using this command:

docker -H tcp:// -d

When doing this on my node (Debian 8, Docker 1.6.0) the command never stops, even if it displays that the daemon has completed initialization.

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  • The complete output:

    INFO[0000] +job init_networkdriver()                    
    INFO[0000] +job serveapi(tcp://            
    INFO[0000] Listening for HTTP on tcp (     
    INFO[0000] -job init_networkdriver() = OK (0)           
    WARN[0000] mountpoint for memory not found              
    INFO[0000] Loading containers: start.                   
    INFO[0000] Loading containers: done.                    
    INFO[0000] docker daemon: 1.6.0 4749651; execdriver: native-0.2; graphdriver: aufs 
    INFO[0000] +job acceptconnections()                     
    INFO[0000] -job acceptconnections() = OK (0)            
    INFO[0000] Daemon has completed initialization

    After this last line nothing happens and I’m not able to write another command.

    I also ran the command using screen to be able to run a command after the first one but I have a error message when running a Docker command:

    FATA[0000] Cannot connect to the Docker daemon. Is 'docker -d' running on this host?

    This command clearly states that the daemon didn’t start correctly. How could I have a Docker daemon that starts and ensures that remote API on Swarm Agents is available over TCP for the Swarm Manager?

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  • One Solution collect form web for “Docker daemon not starting after adding the -H flag”

    This commands states the client cannot talk to the docker daemon/engine/server. According to logs, your server is running.

    With only the -H tcp://, if you didn’t export DOCKER_HOST=, the docker client won’t be able to talk to the daemon. You have 2 ways to handle this :

    1. Exporting DOCKER_HOST

      # Exporting DOCKER_HOST when you want to talk to it
      $ export DOCKER_HOST=
      $ docker ps
    2. Or update your server options to also bind to the socket, like this

      # docker -H tcp:// -H unix://var/run/docker.sock -d
      $ docker ps
    Docker will be the best open platform for developers and sysadmins to build, ship, and run distributed applications.