docker--(3)鏡像

#1.獲取鏡像
咱們可使用docker pull命令從網絡上下載鏡像，命令格式以下

docker pull imageName[:TAG]

若是不指定TAG，則默認下載最新的鏡像。 若是出現以下錯誤

x509: certificate signed by unknown authority

則須要配置Docker加速器，以下連接
https://www.daocloud.io/mirror#accelerator-doc

#2.查看鏡像

docker images

#3.鏡像命別名
使用命令

docker tag 鏡像名 別名

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#4.搜索鏡像
使用命令

docker search 鏡像名

#5.刪除鏡像

docker rmi 鏡像名(或者ID)

#6.建立鏡像
建立鏡像的方法有三種：
##6.1 基於已有鏡像的容器建立
實際上基於已有的鏡像，在其基礎上修改一些東西，再生成新的鏡像

[root@localhost /]# docker images 
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
docker.io/ubuntu    latest              f49eec89601e        5 weeks ago         129.5 MB
[root@localhost /]# docker run -it ubuntu
WARNING: IPv4 forwarding is disabled. Networking will not work.
root@8dfe0092b0d5:/# touch file1
root@8dfe0092b0d5:/# exit
exit
[root@localhost /]# docker commit 8dfe0092b0d5 test
sha256:ace789a750cc1cc1dbe06bebf3c75a2d34c08dbbe91dacb94ef6ea1d15f38af0
[root@localhost /]# docker images 
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
test                latest              ace789a750cc        8 seconds ago       129.5 MB
docker.io/ubuntu    latest              f49eec89601e        5 weeks ago         129.5 MB
[root@localhost /]#

##6.2 基於本地模板導入
##6.3 基於Dockerfile建立
#7.存出和載入鏡像
若是須要存出鏡像到本地磁盤，則使用以下命令

[root@localhost /]# docker images 
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
test                latest              ace789a750cc        8 seconds ago       129.5 MB
docker.io/ubuntu    latest              f49eec89601e        5 weeks ago         129.5 MB
[root@localhost /]# docker save test > /usr/java/test.tar
[root@localhost /]# cd /
[root@localhost /]# ls
bin  boot  certs  dev  etc  home  lib  lib64  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
[root@localhost /]# cd usr/java/
[root@localhost java]# ls
apache-tomcat-7.0.75  apache-tomcat-7.0.75.tar.gz  jdk1.7  test.tar
[root@localhost java]#

若是須要從磁盤中導入鏡像到本地鏡像庫，則使用以下命令

[root@localhost /]# docker load < /usr/java/test.tar
Loaded image: test:latest
[root@localhost /]# docker images 
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
test                latest              ace789a750cc        23 minutes ago      129.5 MB
docker.io/ubuntu    latest              f49eec89601e        5 weeks ago         129.5 MB
[root@localhost /]#

#7.上傳鏡像
使用docker push命令上傳鏡像到倉庫，默認上傳的倉庫的是DockerHub官方倉庫。
命令格式

docker push 鏡像名

以下

[root@localhost /]# docker push test
Error response from daemon: You cannot push a "root" repository. Please rename your repository to docker.io/<user>/<repo> (ex: docker.io/<user>/test)
[root@localhost /]# docker tag test panda30/test
[root@localhost /]# docker push panda30/test
The push refers to a repository [docker.io/panda30/test]
Error: Status 403 trying to push repository panda30/test: "Push failed due to a network error. Please try again. If the problem persists, it may be due to a slow connection."
[root@localhost /]# docker push panda30/test
The push refers to a repository [docker.io/panda30/test]
Put https://index.docker.io/v1/repositories/panda30/test/: x509: certificate signed by unknown authority
[root@localhost /]# docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: panda30
Password: 
Error response from daemon: Get https://registry-1.docker.io/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
[root@localhost /]#