dockerを触ってみる。

dockerを試しで操作した時のメモ

rpmを追加する。

$ wget http://ftp-srv2.kddilabs.jp/Linux/distributions/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm
$ rpm -ivh epel-release-6-8.noarch.rpm

dockerをインストール

$ yum -y --enablerepo=epel install docker-io

service docker status
docker is stopped

動かしてみる。

$ docker run -t centos /bin/echo "hello docker"
hello docker

コンソールに入ってみる。

docker run -i -t centos /bin/bash
bash-4.1#

使えるコマンド

cat /proc/cpuinfo

df はエラーが出る。

df -h
df: cannot read table of mounted file systems: No such file or directory

イメージファイルを確認する。

$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
centos              update              30c0ab421520        2 weeks ago         343.5 MB
centos              centos6             0b443ba03958        3 weeks ago         297.6 MB
centos              latest              0b443ba03958        3 weeks ago         297.6 MB
centos              6.4                 539c0211cd76        13 months ago       300.6 MB

logも確認できる

$ docker logs 0b443ba03958
2014/05/13 22:21:05 Error: No such container: 0b443ba03958

helpを見ると色々ある。

$ docker help
Usage: docker [OPTIONS] COMMAND [arg...]
 -H=[unix:///var/run/docker.sock]: tcp://host:port to bind/connect to or unix://path/to/socket to use

A self-sufficient runtime for linux containers.

Commands:
    attach    Attach to a running container
    build     Build a container from a Dockerfile
    commit    Create a new image from a container's changes
    cp        Copy files/folders from the containers filesystem to the host path
    diff      Inspect changes on a container's filesystem
    events    Get real time events from the server
    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
    insert    Insert a file in an image
    inspect   Return low-level information on a container
    kill      Kill a running container
    load      Load an image from a tar archive
    login     Register or Login to the docker registry server
    logs      Fetch the logs of a container
    port      Lookup the public-facing port which is NAT-ed to PRIVATE_PORT
    ps        List containers
    pull      Pull an image or a repository from the docker registry server
    push      Push an image or a repository to the docker registry server
    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 in the docker index
    start     Start a stopped container
    stop      Stop a running container
    tag       Tag an image into a repository
    top       Lookup the running processes of a container
    version   Show the docker version information
    wait      Block until a container stops, then print its exit code

今度もうちょい試してみよう。