Docker(二) 镜像

简介

Docker镜像是什么？
它是一个只读的文件，就类似于我们安装操作系统时候所需要的那个iso光盘镜像，通过运行这个镜像来完成各种应用的部署。

这里的镜像就是一个能被docker运行起来的一个程序。

查看镜像资源操作命令

docker image 

Usage:	docker image COMMAND

Manage images

Options:
      --help   Print usage

Commands:
  build       Build an image from a Dockerfile
  history     Show the history of an image
  import      Import the contents from a tarball to create a filesystem image
  inspect     Display detailed information on one or more images
  load        Load an image from a tar archive or STDIN
  ls          List images
  prune       Remove unused images
  pull        Pull an image or a repository from a registry
  push        Push an image or a repository to a registry
  rm          Remove one or more images
  save        Save one or more images to a tar archive (streamed to STDOUT by default)
  tag         Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE

Run 'docker image COMMAND --help' for more information on a command.

搜索镜像资源

命令格式：docker search [image_name]

[root@VM_0_4_centos docker]# docker search nginx
INDEX       NAME                                        DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
docker.io   docker.io/nginx                             Official build of Nginx.                        12386     [OK]       
docker.io   docker.io/jwilder/nginx-proxy               Automated Nginx reverse proxy for docker c...   1704                 [OK]
docker.io   docker.io/richarvey/nginx-php-fpm           Container running Nginx + PHP-FPM capable ...   749                  [OK]
docker.io   docker.io/linuxserver/nginx                 An Nginx container, brought to you by Linu...   84                   
docker.io   docker.io/bitnami/nginx                     Bitnami nginx Docker Image                      73                   [OK]
docker.io   docker.io/tiangolo/nginx-rtmp               Docker image with Nginx using the nginx-rt...   60                   [

OFFICIAL [OK] 说明是官方提供的镜像

获取镜像

命令格式：docker pull [image_name]

拉取mysql镜像

[root@VM_0_4_centos docker]# docker pull docker.io/mysql
Using default tag: latest
Trying to pull repository docker.io/library/mysql ... 
latest: Pulling from docker.io/library/mysql
d599a449871e: Pull complete 
f287049d3170: Pull complete 
08947732a1b0: Pull complete 
96f3056887f2: Pull complete 
871f7f65f017: Pull complete 
1dd50c4b99cb: Pull complete 
5bcbdf508448: Pull complete 
a59dcbc3daa2: Pull complete 
13e6809ab808: Pull complete 
2148d51b084d: Pull complete 
93982f7293d7: Pull complete 
e736330a6d9c: Pull complete 
Digest: sha256:c93ba1bafd65888947f5cd8bd45deb7b996885ec2a16c574c530c389335e9169
Status: Downloaded newer image for docker.io/mysql:latest

查看本地镜像

命令格式：docker image ls 
命令格式：docker image

删除镜像资源

命令格式：docker image rm [image_id/image_name:image_version]  
命令格式：docker rmi [image_id/image_name:image_version] 

镜像重命名

docker tag [old_image]:[old_version] [new_image]:[new_version]

[root@VM_0_4_centos docker]# docker image ls
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
docker.io/mysql     latest              d435eee2caa5        4 weeks ago         456 MB
[root@VM_0_4_centos docker]# docker tag docker.io/mysql:latest my_mysql:1.0
[root@VM_0_4_centos docker]# docker image ls
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
docker.io/mysql     latest              d435eee2caa5        4 weeks ago         456 MB
my_mysql            1.0                 d435eee2caa5        4 weeks ago         456 MB

导出镜像

将已经下载好的镜像，导出到本地，以备后用

命令格式：docker save -o [包文件] [镜像]
命令格式：docker save [镜像1] ... [镜像n] > [包文件]

docker save  docker.io/mysql > mysql.tar

导入镜像

命令格式：docker load < [image.tar_name]
命令格式：docker load --input [image.tar_name]

docker load < mysql.tar