Docker入门实操-学习笔记

1. 安装
   [root@localhost ~]# curl -sSL https://get.daocloud.io/docker | sh

2. 运行

   [root@localhost ~]# which docker
   /usr/bin/docker

   [root@localhost ~]# docker version
   Client:
   Version:           18.06.0-ce
   API version:       1.38
   Go version:        go1.10.3
   Git commit:        0ffa825
   Built:             Wed Jul 18 19:08:18 2018
   OS/Arch:           linux/amd64
   Experimental:      false
   Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

报错

[root@localhost ~]# systemctl status docker.service
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since 二 2018-07-31 11:29:01 CST; 46s ago
     Docs: https://docs.docker.com
  Process: 35176 ExecStart=/usr/bin/dockerd (code=exited, status=1/FAILURE)
 Main PID: 35176 (code=exited, status=1/FAILURE)

7月 31 11:29:01 localhost.localdomain systemd[1]: Failed to start Docker Application Container Engine.
7月 31 11:29:01 localhost.localdomain systemd[1]: Unit docker.service entered failed state.
7月 31 11:29:01 localhost.localdomain systemd[1]: docker.service failed.
7月 31 11:29:01 localhost.localdomain systemd[1]: docker.service holdoff time over, scheduling restart.
7月 31 11:29:01 localhost.localdomain systemd[1]: start request repeated too quickly for docker.service
7月 31 11:29:01 localhost.localdomain systemd[1]: Failed to start Docker Application Container Engine.
7月 31 11:29:01 localhost.localdomain systemd[1]: Unit docker.service entered failed state.
7月 31 11:29:01 localhost.localdomain systemd[1]: docker.service failed.

这个可以通过如下方式解决:
查看文件系统 /etc/docker/daemon.json 有没有这个文件，没有测创建它包括二级目录 docker
在daemon.json文件中输入以下内容:

{

  "storage-driver"
  :

  "devicemapper"

 }

如果daemon.json文件包含格式不正确的JSON，Docker将无法启动。

再次启动docker，正常

[root@localhost ~]# systemctl start docker

查看状态
[root@localhost ~]# docker version
Client:
 Version:           18.06.0-ce
 API version:       1.38
 Go version:        go1.10.3
 Git commit:        0ffa825
 Built:             Wed Jul 18 19:08:18 2018
 OS/Arch:           linux/amd64
 Experimental:      false

Server:
 Engine:
  Version:          18.06.0-ce
  API version:      1.38 (minimum version 1.12)
  Go version:       go1.10.3
  Git commit:       0ffa825
  Built:            Wed Jul 18 19:10:42 2018
  OS/Arch:          linux/amd64
  Experimental:     false

3 查看帮助

docker help

4 查看本地仓库的镜像

[root@localhost ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

5 在DockerHub 上搜索共享镜像

[root@localhost ~]# docker search centos7
NAME                              DESCRIPTION                                     STARS               OFFICIAL            AUTOMATED
ansible/centos7-ansible           Ansible on Centos7                              114                                     [OK]
centos/mysql-57-centos7           MySQL 5.7 SQL database server                   35                                      
openshift/base-centos7            A Centos7 derived base image for Source-To-I…   29
（省略）

6 拉取共享镜像
在拉取前需要更改/etc/docker/daemon.json（国内访问dockerhub速度你懂得，在这里使用了ustc的镜像加速）

[root@localhost ~]# more /etc/docker/daemon.json
{"registry-mirrors":["https://docker.mirrors.ustc.edu.cn"]}

[root@localhost ~]# docker pull docker.io/ansible/centos7-ansible
Using default tag: latest
latest: Pulling from ansible/centos7-ansible
45a2e645736c: Pull complete 
1c3acf573616: Pull complete 
edcb61e55ccc: Pull complete 
cbae31bad30a: Pull complete 
aacbdb1e2a62: Pull complete 
fdeea4fb835c: Pull complete 
Digest: sha256:39eff7d56b96530d014083cd343f7314c23acbd1ecf37eb75a71a2f6584d0b02
Status: Downloaded newer image for ansible/centos7-ansible:latest

7.再次查看本地仓库：

[root@localhost ~]# docker images
REPOSITORY                TAG                 IMAGE ID            CREATED             SIZE
ansible/centos7-ansible   latest              688353a31fde        19 months ago       447MB

二、运行容器

1. 运行一个名字为ws的容器，并获取一个shell;

   [root@localhost ~]# docker run -it --name=ws docker.io/ansible/centos7-ansible /bin/bash
   [root@ca8bd201ee4b ansible]#

   此时我们进入ws容器的shell，在这里可以执行一些基本命令。
   安装ip命令

   [root@ca8bd201ee4b ansible]# yum -y install iproute
   Loaded plugins: fastestmirror, ovl
   Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
   base                                                                               | 3.6 kB  00:00:00     
   epel/x86_64/metalink                                                               | 5.8 kB  00:00:00     
   epel                                                                               | 3.2 kB  00:00:00     
   extras                                                                             | 3.4 kB  00:00:00     
   updates                                                                            | 3.4 kB  00:00:00     
   (1/7): base/7/x86_64/group_gz                                                      | 166 kB  00:00:00     
   (2/7): epel/x86_64/group_gz                                                        |  88 kB  00:00:00     
   (3/7): extras/7/x86_64/primary_db                                                  | 172 kB  00:00:00     
   (4/7): epel/x86_64/updateinfo                                                      | 930 kB  00:00:01     
   (5/7): epel/x86_64/primary                                                         | 3.6 MB  00:00:01     
   (6/7): base/7/x86_64/primary_db                                                    | 5.9 MB  00:00:02     
   (7/7): updates/7/x86_64/primary_db            
   （省略）

   [root@ca8bd201ee4b ansible]# ip a
   1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
   link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
   inet 127.0.0.1/8 scope host lo
      valid_lft forever preferred_lft forever
   24: eth0@if25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
   link/ether 02:42:ac:11:00:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
   inet 172.17.0.2/16 brd 172.17.255.255 scope global eth0
      valid_lft forever preferred_lft forever

   看着和在宿主机上没有区别？

从docker里面可以直接进入物理机

[root@ca8bd201ee4b ansible]# ssh 192.168.10.138
The authenticity of host ‘192.168.10.138 (192.168.10.138)‘ can‘t be established.
ECDSA key fingerprint is 0c:23:1d:1b:c7:95:e8:18:b4:4c:6d:de:98:03:9e:6e.
Are you sure you want to continue connecting (yes/no)?

2.离开容器（ctrl+p+q）

[root@localhost ~]# docker ps
CONTAINER ID        IMAGE                     COMMAND             CREATED             STATUS              PORTS               NAMES
ca8bd201ee4b        ansible/centos7-ansible   "/bin/bash"         2 hours ago         Up 2 hours                              ws

容器ID 使用镜像 执行命令 创建时间 名字

3. 连接正在运行的容器

   [root@localhost ~]# docker attach ws
   [root@ca8bd201ee4b ansible]#

4. 退出容器

   [root@ca8bd201ee4b ansible]# exit
   exit
   [root@localhost ~]# docker ps
   CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

退出容器后，docker ps 已经看不到，使用-a参数

[root@localhost ~]# docker ps -a
CONTAINER ID        IMAGE                     COMMAND             CREATED             STATUS                            PORTS               NAMES
ca8bd201ee4b        ansible/centos7-ansible   "/bin/bash"         2 hours ago         Exited (255) About a minute ago                       ws

5. 启动一个退出的容器

   [root@localhost ~]# docker start ws
   ws
   [root@localhost ~]# docker ps
   CONTAINER ID        IMAGE                     COMMAND             CREATED             STATUS              PORTS               NAMES
   ca8bd201ee4b        ansible/centos7-ansible   "/bin/bash"         2 hours ago         Up 6 seconds                            ws

6 使用宿主机停止容器

[root@localhost ~]# docker ps
CONTAINER ID        IMAGE                     COMMAND             CREATED             STATUS              PORTS               NAMES
ca8bd201ee4b        ansible/centos7-ansible   "/bin/bash"         2 hours ago         Up About a minute                       ws
[root@localhost ~]# docker stop ws
ws
[root@localhost ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

7. 删除容器（先停止再删除）

   [root@localhost ~]# docker ps -a
   CONTAINER ID        IMAGE                     COMMAND             CREATED             STATUS                        PORTS               NAMES
   ca8bd201ee4b        ansible/centos7-ansible   "/bin/bash"         2 hours ago         Exited (137) 46 seconds ago                       ws
   [root@localhost ~]# docker rm ca8bd201ee4b
   ca8bd201ee4b

参考https://mp.weixin.qq.com/s/sqsOraQmjNEP4OSPJi8g8Q

Docker入门实操-学习笔记

原文：http://blog.51cto.com/9201316/2152564