Red Hat
Jun 21, 2015
by arungupta

Docker 1.7.0 is released (change log) and so time to update Docker Hosts, CLI, and other tools.

Docker 1.7.0

Docker Host is running inside a Docker Machine and so the machine needs to be upgraded. The machine must be stopped otherwise you get an error as:

Error: machine must be running to upgrade.

So start the machine as:

>docker-machine start mymachine
Starting VM...

And then upgrade the machine as:

> docker-machine upgrade mymachine
Stopping machine to do the upgrade...
Upgrading machine mymachine...
Downloading https://github.com/boot2docker/boot2docker/releases/download/v1.7.0/boot2docker.iso to /Users/arungupta/.docker/machine/cache/boot2docker.iso...
Starting machine back up...
Starting VM...

The machine is anyway stopped to perform an upgrade, and so the need to start the machine seems superfluous (#1399).

Upgrading the host updates .docker/machine/cache/boot2docker.iso. Any previously created machines cache the boot2docker.iso in .docker/machine/machines/<MACHINE-NAME> and so they’ll continue to boot using the same version.

Docker CLI

Update the Docker CLI as:

curl https://get.docker.com/builds/Darwin/x86_64/docker-latest > /usr/local/bin/docker

Now docker version shows the following output:

> docker version
Client version: 1.7.0
Client API version: 1.19
Go version (client): go1.4.2
Git commit (client): 0baf609
OS/Arch (client): darwin/amd64
Server version: 1.7.0
Server API version: 1.19
Go version (server): go1.4.2
Git commit (server): 0baf609
OS/Arch (server): linux/amd64

Note, the client API version (1.7.0) and the server API version (1.7.0) are both shown here.

If you update only the CLI and not the Docker Host, then the following error message is shown:

Error response from daemon: client and server don't have same version (client : 1.19, server: 1.18)

This error messages shows a version mismatch between the client CLI and the Docker Host running in the machine. The will typically happen if the active machine was created a few days ago using an older boot2docker.iso. There seems to be no way straight forward way to find out the exact version currently being used (#1398).

There seems to be no way for a new client to talk to the old server (#14077), and thus the host needs to be upgraded. There is a proposal to override the API version of client (#11486), but at this time there is no ETA for the fix. So the only option is to upgrade the docker machine, which will then then upgrade to the latest version of Docker.

So upgrading the CLI requires to upgrade the machine as well.

Here are the options supported by Docker CLI :

> docker --help
Usage: docker [OPTIONS] COMMAND [arg...]

A self-sufficient runtime for linux containers.

Options:

  -D, --debug=false                                              Enable debug mode
  -d, --daemon=false                                             Enable daemon mode
  -H, --host=[]                                                  Daemon socket(s) to connect to
  -h, --help=false                                               Print usage
  -l, --log-level=info                                           Set the logging level
  --tls=false                                                    Use TLS; implied by --tlsverify
  --tlscacert=~/.docker/machine/machines/microservices/ca.pem    Trust certs signed only by this CA
  --tlscert=~/.docker/machine/machines/microservices/cert.pem    Path to TLS certificate file
  --tlskey=~/.docker/machine/machines/microservices/key.pem      Path to TLS key file
  --tlsverify=true                                               Use TLS and verify the remote
  -v, --version=false                                            Print version information and quit

Commands:
    attach    Attach to a running container
    build     Build an image from a Dockerfile
    commit    Create a new image from a container's changes
    cp        Copy files/folders from a container's filesystem to the host path
    create    Create a new container
    diff      Inspect changes on a container's filesystem
    events    Get real time events from the server
    exec      Run a command in a running container
    export    Stream the contents of a container as a tar archive
    history   Show the history of an image
    images    List images
    import    Create a new filesystem image from the contents of a tarball
    info      Display system-wide information
    inspect   Return low-level information on a container or image
    kill      Kill a running container
    load      Load an image from a tar archive
    login     Register or log in to a Docker registry server
    logout    Log out from a Docker registry server
    logs      Fetch the logs of a container
    pause     Pause all processes within a container
    port      Lookup the public-facing port that is NAT-ed to PRIVATE_PORT
    ps        List containers
    pull      Pull an image or a repository from a Docker registry server
    push      Push an image or a repository to a Docker registry server
    rename    Rename an existing container
    restart   Restart a running container
    rm        Remove one or more containers
    rmi       Remove one or more images
    run       Run a command in a new container
    save      Save an image to a tar archive
    search    Search for an image on the Docker Hub
    start     Start a stopped container
    stats     Display a stream of a containers' resource usage statistics
    stop      Stop a running container
    tag       Tag an image into a repository
    top       Lookup the running processes of a container
    unpause   Unpause a paused container
    version   Show the Docker version information
    wait      Block until a container stops, then print its exit code

Run 'docker COMMAND --help' for more information on a command.
machines> docker events --help

Usage: docker events [OPTIONS]

Get real time events from the server

  -f, --filter=[]    Filter output based on conditions provided
  --help=false       Print usage
  --since=           Show all events created since timestamp
  --until=           Stream events until this timestamp

Docker Machine 0.3.0

This was rather straight forward:

curl -L https://github.com/docker/machine/releases/download/v0.3.0/docker-machine_darwin-amd64 > /usr/local/bin/docker-machine

There are a lots of new features, including an experimental provisioner for Red Hat Enterprise Linux 7.0.

The version is shown as:

> docker-machine --version
docker-machine version 0.3.0 (0a251fe)

Complete list of commands are:

> docker-machine --help
Usage: docker-machine [OPTIONS] COMMAND [arg...]

Create and manage machines running Docker.

Version: 0.3.0 (0a251fe)

Author:
  Docker Machine Contributors - <https://github.com/docker/machine>

Options:
  --debug, -D						Enable debug mode
  -s, --storage-path "/Users/arungupta/.docker/machine"	Configures storage path [$MACHINE_STORAGE_PATH]
  --tls-ca-cert 					CA to verify remotes against [$MACHINE_TLS_CA_CERT]
  --tls-ca-key 						Private key to generate certificates [$MACHINE_TLS_CA_KEY]
  --tls-client-cert 					Client cert to use for TLS [$MACHINE_TLS_CLIENT_CERT]
  --tls-client-key 					Private key used in client TLS auth [$MACHINE_TLS_CLIENT_KEY]
  --native-ssh						Use the native (Go-based) SSH implementation. [$MACHINE_NATIVE_SSH]
  --help, -h						show help
  --version, -v						print the version
  
Commands:
  active		Print which machine is active
  config		Print the connection config for machine
  create		Create a machine
  env			Display the commands to set up the environment for the Docker client
  inspect		Inspect information about a machine
  ip			Get the IP address of a machine
  kill			Kill a machine
  ls			List machines
  regenerate-certs	Regenerate TLS Certificates for a machine
  restart		Restart a machine
  rm			Remove a machine
  ssh			Log into or run a command on a machine with SSH.
  scp			Copy files between machines
  start			Start a machine
  stop			Stop a machine
  upgrade		Upgrade a machine to the latest version of Docker
  url			Get the URL of a machine
  help, h		Shows a list of commands or help for one command
  
Run 'docker-machine COMMAND --help' for more information on a command.

Docker Compose 1.3.0

Docker Compose can be updated to 1.3.0 as:

curl -L https://github.com/docker/compose/releases/download/1.3.0/docker-compose-`uname -s`-`uname -m` &gt; /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose

The version is shown as:

> docker-compose --version
docker-compose version: 1.3.0
CPython version: 2.7.9
OpenSSL version: OpenSSL 1.0.1j 15 Oct 2014

Two important points to note:

  • At least Docker 1.6.0 is required
  • There are breaking changes from Compose 1.2 and so you either need to remove and recreate your containers, or migrate them.Fortunately docker-compose migrate-to-labels can be used to migrate pre-Compose 1.3.0 containers to the latest format. This will recreate the containers with labels added.

Learn more in Docker Compose to Orchestrate Containers.

Docker Swarm 0.3.0

As of this blog, Docker Swarm 0.3.0 RC3 is available. Clustering Using Docker Swarm provide a good introduction to Docker Swarm and can be used to get started with the latest Docker Swarm release.

34 issues have been fixed since 0.2.0 but the commit notifications since 0.2.0 for Release Candidates seem to show no significant changes.

More detailed blogs on each Docker component will be shared in subsequent blogs.

Enjoy!

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