03 - Centos7中安装及验证Docker

系统管理员 2022-07-14 11:43 183阅读 0赞

### 安装 ###

在Centos7中安装Docker非常简单，只需要一个命令：

yum -y install docker

而在Centos6的系统中安装Docker要相对复杂一些，首先需要将系统内核版本升级到`3.10`以上，其次需要通过使用命令`yum update`等升级操作系统，具体安装方法可参考文章[《Centos 6.4中安装Docker》][Centos 6.4_Docker]。

安装完成后需要启动docker服务：

systemctl start docker

### 验证 ###

安装完成后需要验证docker服务是否安装成功和是否正常启动。

*  验证版本信息

docker version

出现下面信息表示docker安装成功及正常启动：

[root@localhost ~]# docker version
    Client:
     Version:         1.10.3
     API version:     1.22
     Package version: docker-common-1.10.3-46.el7.centos.14.x86_64
     Go version:      go1.6.3
     Git commit:      cb079f6-unsupported
     Built:           Fri Sep 16 13:24:25 2016
     OS/Arch:         linux/amd64
    
    Server:
     Version:         1.10.3
     API version:     1.22
     Package version: docker-common-1.10.3-46.el7.centos.14.x86_64
     Go version:      go1.6.3
     Git commit:      cb079f6-unsupported
     Built:           Fri Sep 16 13:24:25 2016
     OS/Arch:         linux/amd64
    [root@localhost ~]#

如果出现下面信息则表示只是安装成功而没有正常启动：

此时需要输入命令：`systemctl start docker`来启动docker服务。

*  启动容器验证

输入命令：`docker run hello-world`：

[root@localhost ~]# docker run hello-world
    Unable to find image 'hello-world:latest' locally
    Trying to pull repository docker.io/library/hello-world ...
    latest: Pulling from docker.io/library/hello-world
    c04b14da8d14: Pull complete
    Digest: sha256:0256e8a36e2070f7bf2d0b0763dbabdd67798512411de4cdcf9431a1feb60fd9
    Status: Downloaded newer image for docker.io/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 Hub account:
     https://hub.docker.com
    
    For more examples and ideas, visit:
     https://docs.docker.com/engine/userguide/

出现上面信息表示安装成功！

[Centos 6.4_Docker]: http://www.zslin.com/web/article/detail/4