4. Docker的镜像命令
4.1. 帮助命令
# 查看docker的版本信息
docker version
# 查看docker的详细信息（系统信息，包括镜像、容器的数量）
docker info
# docker的帮助命令，简称万能命令
docker --help帮助文档的地址：https://docs.docker.com/reference/
4.2. 镜像命令
docker images
docker images 查看本地主机上所有的镜像
[root@iZ8vb6lqqya4rvreq9ra6gZ lib]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
hello-world latest feb5d9fea6a5 4 months ago 13.3kB
# 解释
REPOSITORY 镜像的仓库源
TAG 镜像的标签
IMAGE ID 镜像的ID
CREATED 镜像的创建时间
SIZE 镜像的大小
# 可选项
Options:
-a, --all 列出所有的镜像
-q, --quiet 只显示镜像的IDdocker search
在dockerHub上进行搜索：
dockerHub的地址：https://hub.docker.com
在dockerHub上搜索步骤：
1、输入想要搜索的镜像名
2、查看镜像的信息（描述信息、版本标签信息）
docker search 搜索镜像命令
[root@iZ8vb6lqqya4rvreq9ra6gZ lib]# docker search mysql
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
mysql MySQL is a widely used, open-source relation… 12069 [OK]
mariadb MariaDB Server is a high performing open sou… 4626 [OK]
# 可选项
Options:
-f, --filter filter 通过搜索条件来过滤
# 举例：搜索镜像的STARS大于10000的mysql镜像
docker search mysql --filter=STARS=10000
# 结果如下：
[root@iZ8vb6lqqya4rvreq9ra6gZ lib]# docker search mysql --filter=STARS=10000
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
mysql MySQL is a widely used, open-source relation… 12069 [OK]
docker pull
docker pull 下载镜像
[root@iZ8vb6lqqya4rvreq9ra6gZ ~]# docker pull mysql
Using default tag: latest #默认拉取最新版的mysql镜像
latest: Pulling from library/mysql
72a69066d2fe: Pull complete # 分层下载，docker image的核心
93619dbc5b36: Pull complete
99da31dd6142: Pull complete
626033c43d70: Pull complete
37d5d7efb64e: Pull complete
ac563158d721: Pull complete
d2ba16033dad: Pull complete
688ba7d5c01a: Pull complete
00e060b6d11d: Pull complete
1c04857f594f: Pull complete
4d7cfa90e6ea: Pull complete
e0431212d27d: Pull complete
Digest: sha256:e9027fe4d91c0153429607251656806cc784e914937271037f7738bd5b8e7709 # 签名信息，防伪标志
Status: Downloaded newer image for mysql:latest
docker.io/library/mysql:latest # 真实地址即：docker pull mysql == docker pull docker.io/library/mysql 这两个命令是等价的。
docker pull 命令也可以指定版本进行下载，如下：
docker pull 镜像名[:tag] # []括号里面的是可选项，可以不写（默认拉取最新版本），写了表示拉取指定版本的镜像
[root@iZ8vb6lqqya4rvreq9ra6gZ ~]# docker pull mysql:5.7
5.7: Pulling from library/mysql
72a69066d2fe: Already exists # 这里就用到了docker image的分层，已经存在的，docker不再下载，多个镜像可以共用一个，这里其实就是docker中的联合文件系统
93619dbc5b36: Already exists
99da31dd6142: Already exists
626033c43d70: Already exists
37d5d7efb64e: Already exists
ac563158d721: Already exists
d2ba16033dad: Already exists
0ceb82207cd7: Pull complete
37f2405cae96: Pull complete
e2482e017e53: Pull complete
70deed891d42: Pull complete
Digest: sha256:f2ad209efe9c67104167fc609cca6973c8422939491c9345270175a300419f94
Status: Downloaded newer image for mysql:5.7
docker.io/library/mysql:5.7查看所有镜像
[root@iZ8vb6lqqya4rvreq9ra6gZ ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
mysql 5.7 c20987f18b13 6 weeks ago 448MB
mysql latest 3218b38490ce 6 weeks ago 516MB
hello-world latest feb5d9fea6a5 4 months ago 13.3kBdocker rmi
docker rmi 删除镜像
删除指定的镜像
docker rmi -f 镜像名（或镜像的ID）删除多个镜像，中间使用空格分开
docker rmi -f 镜像名（或镜像的ID） 镜像名（或镜像的ID） 镜像名（或镜像的ID） 镜像名（或镜像的ID）删除所有的镜像，$(docker images -aq)是作为参数传进去的，docker images -aq命令查询出来的是所有镜像的ID
docker rmi -f $(docker images -aq)具体使用
[root@iZ8vb6lqqya4rvreq9ra6gZ ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
mysql 5.7 c20987f18b13 6 weeks ago 448MB
mysql latest 3218b38490ce 6 weeks ago 516MB
hello-world latest feb5d9fea6a5 4 months ago 13.3kB
#根据镜像ID进行删除
[root@iZ8vb6lqqya4rvreq9ra6gZ ~]# docker rmi -f c20987f18b13
Untagged: mysql:5.7
Untagged: mysql@sha256:f2ad209efe9c67104167fc609cca6973c8422939491c9345270175a300419f94
Deleted: sha256:c20987f18b130f9d144c9828df630417e2a9523148930dc3963e9d0dab302a76 #删除了自己的层，共用的层没有被删除
Deleted: sha256:6567396b065ee734fb2dbb80c8923324a778426dfd01969f091f1ab2d52c7989
Deleted: sha256:0910f12649d514b471f1583a16f672ab67e3d29d9833a15dc2df50dd5536e40f
Deleted: sha256:6682af2fb40555c448b84711c7302d0f86fc716bbe9c7dc7dbd739ef9d757150
Deleted: sha256:5c062c3ac20f576d24454e74781511a5f96739f289edaadf2de934d06e910b92
# 下面命令的$(docker images -aq)是作为参数传进去的，`docker images -aq`命令查询出来的是所有镜像的ID
# 所以下面的命令就是删除所有的docker镜像
[root@iZ8vb6lqqya4rvreq9ra6gZ ~]# docker rmi -f $(docker images -aq)
Untagged: mysql:latest
Untagged: mysql@sha256:e9027fe4d91c0153429607251656806cc784e914937271037f7738bd5b8e7709
Deleted: sha256:3218b38490cec8d31976a40b92e09d61377359eab878db49f025e5d464367f3b
Deleted: sha256:aa81ca46575069829fe1b3c654d9e8feb43b4373932159fe2cad1ac13524a2f5
Deleted: sha256:0558823b9fbe967ea6d7174999be3cc9250b3423036370dc1a6888168cbd224d
Deleted: sha256:a46013db1d31231a0e1bac7eeda5ad4786dea0b1773927b45f92ea352a6d7ff9
Deleted: sha256:af161a47bb22852e9e3caf39f1dcd590b64bb8fae54315f9c2e7dc35b025e4e3
Deleted: sha256:feff1495e6982a7e91edc59b96ea74fd80e03674d92c7ec8a502b417268822ff
Deleted: sha256:8805862fcb6ef9deb32d4218e9e6377f35fb351a8be7abafdf1da358b2b287ba
Deleted: sha256:872d2f24c4c64a6795e86958fde075a273c35c82815f0a5025cce41edfef50c7
Deleted: sha256:6fdb3143b79e1be7181d32748dd9d4a845056dfe16ee4c827410e0edef5ad3da
Deleted: sha256:b0527c827c82a8f8f37f706fcb86c420819bb7d707a8de7b664b9ca491c96838
Deleted: sha256:75147f61f29796d6528486d8b1f9fb5d122709ea35620f8ffcea0e0ad2ab0cd0
Deleted: sha256:2938c71ddf01643685879bf182b626f0a53b1356138ef73c40496182e84548aa
Deleted: sha256:ad6b69b549193f81b039a1d478bc896f6e460c77c1849a4374ab95f9a3d2cea2
Untagged: hello-world:latest
Untagged: hello-world@sha256:507ecde44b8eb741278274653120c2bf793b174c06ff4eaa672b713b3263477b
Deleted: sha256:feb5d9fea6a5e9606aa995e879d862b825965ba48de054caab5ef356dc6b3412
[root@iZ8vb6lqqya4rvreq9ra6gZ ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
[root@iZ8vb6lqqya4rvreq9ra6gZ ~]# 
