CentOS 7 的 Docker 服務安裝

# Install Docker in CentOS 7 ， lsb_release 確定一下目前的 linux 版本

[mtchang@mtchang ~]$ sudo lsb_release -a

LSB Version:        :core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch

Distributor ID:        CentOS

Description:        CentOS Linux release 7.0.1406 (Core)

Release:        7.0.1406

Codename:        Core

# 直接安裝 docker 和 docker-registry

[mtchang@mtchang ~]$ sudo yum -y install docker docker-registry

# 在 centos 7 使用 systemctl 管控 docker.service ，這裡是把服務預設開機啟動

[mtchang@mtchang ~]$ sudo systemctl enable docker.service

ln -s '/usr/lib/systemd/system/docker.service' '/etc/systemd/system/multi-user.target.wants/docker.service'

# 手動啟用 docker service

[mtchang@mtchang ~]$ sudo systemctl start docker.service

# 驗證是否已經啟動

[mtchang@mtchang ~]$ sudo systemctl status docker.service

docker.service - Docker Application Container Engine

   Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled)

   Active: active (running) since Sat 2015-02-21 15:22:01 CST; 15s ago

     Docs: http://docs.docker.com

 Main PID: 4346 (docker)

   CGroup: /system.slice/docker.service

           └─4346 /usr/bin/docker -d --selinux-enabled -H fd://

Feb 21 15:21:51 mtchang docker[4346]: 2015/02/21 15:21:51 docker daemon: 1.3.2 39fa2fa/1.3.2; execdriver: nat...iver:

Feb 21 15:21:51 mtchang docker[4346]: [aec76134] +job serveapi(fd://)

Feb 21 15:21:51 mtchang docker[4346]: [info] Listening for HTTP on fd ()

Feb 21 15:22:00 mtchang docker[4346]: [aec76134] +job init_networkdriver()

Feb 21 15:22:00 mtchang docker[4346]: [aec76134] -job init_networkdriver() = OK (0)

Feb 21 15:22:01 mtchang docker[4346]: [info] Loading containers:

Feb 21 15:22:01 mtchang docker[4346]: [info] : done.

Feb 21 15:22:01 mtchang docker[4346]: [aec76134] +job acceptconnections()

Feb 21 15:22:01 mtchang docker[4346]: [aec76134] -job acceptconnections() = OK (0)

Feb 21 15:22:01 mtchang systemd[1]: Started Docker Application Container Engine.

Hint: Some lines were ellipsized, use -l to show in full.

# 從 docker registry 抓取 ubuntu 的影像檔案

[mtchang@mtchang ~]$ sudo docker pull ubuntu

Pulling repository ubuntu

2d24f826cb16: Download complete

511136ea3c5a: Download complete

fa4fd76b09ce: Download complete

1c8294cc5160: Download complete

117ee323aaa9: Download complete

Status: Downloaded newer image for ubuntu:latest

# docker run 指令執行以 ubuntu 影像檔為基礎的一個 container

# mtchang@mt ~ $ sudo docker run --help

# 語法: docker run [OPTIONS] IMAGE [COMMAND] [ARG...]

# -i 可以保持 STDIN 輸出訊息打開

# -t 可以取得一個 pseudo-TTY (虛擬終端機界面)

[mtchang@mtchang ~]$ sudo docker run -i -t ubuntu /bin/bash

# 已經切換到docker container 內， ip 也變換成為虛擬網段 172.17.0.xx。

root@bc44ac88d7a4:/# ifconfig

eth0      Link encap:Ethernet  HWaddr 02:42:ac:11:00:02

          inet addr:172.17.0.2  Bcast:0.0.0.0  Mask:255.255.0.0

          inet6 addr: fe80::42:acff:fe11:2/64 Scope:Link

          UP BROADCAST RUNNING  MTU:1500  Metric:1

          RX packets:19 errors:0 dropped:0 overruns:0 frame:0

          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:2173 (2.1 KB)  TX bytes:508 (508.0 B)

lo        Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::1/128 Scope:Host

          UP LOOPBACK RUNNING  MTU:65536  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0

          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

root@bc44ac88d7a4:/#  exit

exit