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はじめてのdocker

Posted at

勉強前イメージ

知ってはいるけど、触ったことないし最初難しそう....

dockerのインストール・設定

  • インストール
yum update
yum search docker
yum install -y docker
  • dockerの起動・自動起動設定
systemctl start docker
systemctl enable docker
  • バージョン確認
docker -v

ubuntuの環境を立ててみる

  • ubuntuのコンテナを検索
docker search ubuntu
==========
INDEX       NAME                                                                DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
docker.io   docker.io/ubuntu                                                    Ubuntu is a Debian-based Linux operating s...   11721     [OK]       
docker.io   docker.io/dorowu/ubuntu-desktop-lxde-vnc                            Docker image to provide HTML5 VNC interfac...   487                  [OK]
docker.io   docker.io/websphere-liberty                                         WebSphere Liberty multi-architecture image...   266       [OK]       
docker.io   docker.io/rastasheep/ubuntu-sshd                                    Dockerized SSH service, built on top of of...   250                  [OK]
docker.io   docker.io/consol/ubuntu-xfce-vnc                                    Ubuntu container with "headless" VNC sessi...   231                  [OK]
docker.io   docker.io/ubuntu-upstart                                            Upstart is an event-based replacement for ...   110       [OK]       
docker.io   docker.io/neurodebian                                               NeuroDebian provides neuroscience research...   78        [OK]       
docker.io   docker.io/1and1internet/ubuntu-16-nginx-php-phpmyadmin-mysql-5      ubuntu-16-nginx-php-phpmyadmin-mysql-5          50                   [OK]
docker.io   docker.io/ubuntu-debootstrap                                        debootstrap --variant=minbase --components...   44        [OK]       
docker.io   docker.io/open-liberty                                              Open Liberty multi-architecture images bas...   42        [OK]       
docker.io   docker.io/i386/ubuntu                                               Ubuntu is a Debian-based Linux operating s...   24                   
docker.io   docker.io/nuagebec/ubuntu                                           Simple always updated Ubuntu docker images...   24                   [OK]
docker.io   docker.io/1and1internet/ubuntu-16-apache-php-5.6                    ubuntu-16-apache-php-5.6                        14                   [OK]
docker.io   docker.io/1and1internet/ubuntu-16-apache-php-7.0                    ubuntu-16-apache-php-7.0                        13                   [OK]
docker.io   docker.io/1and1internet/ubuntu-16-nginx-php-phpmyadmin-mariadb-10   ubuntu-16-nginx-php-phpmyadmin-mariadb-10       11                   [OK]
docker.io   docker.io/1and1internet/ubuntu-16-nginx-php-5.6-wordpress-4         ubuntu-16-nginx-php-5.6-wordpress-4             8                    [OK]
docker.io   docker.io/1and1internet/ubuntu-16-apache-php-7.1                    ubuntu-16-apache-php-7.1                        6                    [OK]
docker.io   docker.io/1and1internet/ubuntu-16-nginx-php-7.0                     ubuntu-16-nginx-php-7.0                         4                    [OK]
docker.io   docker.io/pivotaldata/ubuntu                                        A quick freshening-up of the base Ubuntu d...   4                    
docker.io   docker.io/pivotaldata/ubuntu16.04-build                             Ubuntu 16.04 image for GPDB compilation         2                    
docker.io   docker.io/1and1internet/ubuntu-16-php-7.1                           ubuntu-16-php-7.1                               1                    [OK]
docker.io   docker.io/1and1internet/ubuntu-16-sshd                              ubuntu-16-sshd                                  1                    [OK]
docker.io   docker.io/pivotaldata/ubuntu-gpdb-dev                               Ubuntu images for GPDB development              1                    
docker.io   docker.io/smartentry/ubuntu                                         ubuntu with smartentry                          1                    [OK]
docker.io   docker.io/pivotaldata/ubuntu16.04-test                              Ubuntu 16.04 image for GPDB testing             0                    
==========
  • dockerコンテナをダウンロード

コマンドは docker pull イメージ名 を使用します

docker pull ubuntu
==========
[root@localhost ~]# docker pull ubuntu
Using default tag: latest
Trying to pull repository docker.io/library/ubuntu ... 
latest: Pulling from docker.io/library/ubuntu
83ee3a23efb7: Pull complete 
db98fc6f11f0: Pull complete 
f611acd52c6c: Pull complete 
Digest: sha256:703218c0465075f4425e58fac086e09e1de5c340b12976ab9eb8ad26615c3715
Status: Downloaded newer image for docker.io/ubuntu:latest
==========
  • ダウンロードしてきたイメージを確認
docker images
==========
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
docker.io/ubuntu    latest              f63181f19b2f        34 hours ago        72.9 MB
==========
  • dockerコンテナの実行

コマンドは docker run オプション イメージID を使用します
イメージIDは↑で出力されている、 f63181f19b2f です。
オプションは -it でターミナル上での操作が可能です。

docker run -it f63181f19b2f
==========
[root@localhost ~]# docker run -it f63181f19b2f
root@04632dddfde1:~# cat /etc/os-release
NAME="Ubuntu"
VERSION="20.04.1 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.1 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
root@04632dddfde1:~# 
==========
  • コンテナから抜ける

exit で抜けれます

root@04632dddfde1:~# exit
exit
[root@localhost ~]# 
  • dockerの状態を確認
docker ps -a
==========
[root@localhost ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                     PORTS               NAMES
04632dddfde1        f63181f19b2f        "/bin/bash"         6 minutes ago       Exited (0) 4 minutes ago                       naughty_keller
==========
  • dockerを停止

docker stop コンテナID で停止させることができます

docker stop 04632dddfde1
==========
[root@localhost ~]# docker stop 04632dddfde1
04632dddfde1
==========

勉強後イメージ

インストールしてコンテナを実行するまでしかできてないけど、案外簡単にできたかも?
次はコンテナ上でいろいろしてみたい

参考

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