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