Docker のインストール方法


インストール方法は、いくつかあるらしい。(リポジトリをセットアップする。rpm から入れる。テストと開発の環境を入れるなど)

CentOS 7 を minimal install した場合。

yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo
yum install docker-ce docker-ce-cli


systemctl start docker
[root@centos7 yum.repos.d]# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete
Digest: sha256:0e11c388b664df8a27a901dce21eb89f11d8292f7fca1b3e3c4321bf7897bffe
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:

For more examples and ideas, visit:

OS起動時に docker を起動するようにする

systemctl enable docker

nginx を動かしてみる

Docker Official Images

フォルダ /home/htdocs01/ を作成
index.html を配置する



[root@centos7 home]# docker run --name some-nginx -v /home/htdocs01:/usr/share/nginx/html:ro -d -p 8081:80 nginx
Unable to find image 'nginx:latest' locally
latest: Pulling from library/nginx
743f2d6c1f65: Pull complete
6bfc4ec4420a: Pull complete
688a776db95f: Pull complete
Digest: sha256:23b4dcdf0d34d4a129755fc6f52e1c6e23bb34ea011b315d87e193033bcd1b68
Status: Downloaded newer image for nginx:latest

–name : コンテナの名前
-v : コンテンツを含むディレクトリ (volume ?)
-d : バックグランドで実行(daemon)
-p : ポートを指定

[root@centos7 htdocs01]# curl http://localhost:8081/
[root@centos7 htdocs01]#


[root@centos7 htdocs01]# docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                  NAMES
254f9174cae7        nginx               "nginx -g 'daemon of…"   11 minutes ago      Up 11 minutes>80/tcp   some-nginx
[root@centos7 htdocs01]# docker stop 254f9174cae7
[root@centos7 htdocs01]# docker rm 254f9174cae7
[root@centos7 htdocs01]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@centos7 htdocs01]#