[root@localhost overlay2]# docker images | grep nginx
nginx latest c39a868aad02 3 days ago 133MB
nginx web c39a868aad02 3 days ago 133MB
[root@localhost overlay2]# docker rmi c39a868aad02 ##此時有別名，刪除ID時會報錯
Error response from daemon: conflict: unable to delete c39a868aad02 (must be forced) - image is referenced in multiple repositories
[root@localhost overlay2]# docker rmi nginx:latest
Untagged: nginx:latest
[root@localhost overlay2]# docker images | grep nginx
nginx web c39a868aad02 3 days ago 133MB
二 驗證docker 0是所有容器的網橋，同屬一個網段
[root@localhost overlay2]# ifconfig ##發現docker 0 虛擬網路卡，地址為172.17.0.1，為所有容器的網橋
docker0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
inet6 fe80::42:3bff:fee9:944 prefixlen 64 scopeid 0x20<link>
ether 02:42:3b:e9:09:44 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 13 bytes 1760 (1.7 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@localhost overlay2]# docker create -it centos:7 /bin/bash ##測試容器的IP地址，需要裝個centos7作業系統環境
Unable to find image 'centos:7' locally
7: Pulling from library/centos
75f829a71a1c: Pull complete
Digest: sha256:19a79828ca2e505eaee0ff38c2f3fd9901f4826737295157cc5212b7a372cd2b
Status: Downloaded newer image for centos:7
dd81304926723c11552fde4b5fa223cf2f629ea6cb579c84d9dcecc1ed26312e
[root@localhost overlay2]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
dd8130492672 centos:7 "/bin/bash" 17 seconds ago Created kind_hermann
f9eaf968d810 nginx:web "/docker-entrypoint.…" 9 minutes ago Up 7 minutes 80/tcp hopeful_brown
[root@localhost overlay2]# docker start dd8130492672 ##啟動容器
dd8130492672
[root@localhost overlay2]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
dd8130492672 centos:7 "/bin/bash" About a minute ago Up 20 seconds kind_hermann
f9eaf968d810 nginx:web "/docker-entrypoint.…" 10 minutes ago Up 8 minutes 80/tcp hopeful_brown
[root@localhost overlay2]# docker exec -it dd8130492672 /bin/bash ##進入已經在執行的容器中[root@dd8130492672 /]# yum -y install net-tools[root@dd8130492672 /]# ifconfig ##檢視容器IP地址，發現同屬一個網段
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.0.3 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:ac:11:00:03 txqueuelen 0 (Ethernet)
RX packets 1399 bytes 11834645 (11.2 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1346 bytes 75971 (74.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@dd8130492672 /]# exit ##退出容器exit
三 存出映象，載入映象
[root@localhost overlay2]# docker save -o /opt/nginx nginx:web ##把映象命令為nginx存在opt目錄下 [root@localhost overlay2]# docker rmi nginx:web ##刪除映象
Untagged: nginx:web
Untagged: nginx@sha256:aeade65e99e5d5e7ce162833636f692354c227ff438556e5f3ed0335b7cc2f1b
Deleted: sha256:c39a868aad02a383c7e490e0fc4a5b0217f667f2de764bc2755e315a5adf64a1
Deleted: sha256:1af47386c12cb24b362bd785e71058ab675fbdcbda8e7a7ba0dd10c3cff75a2a
Deleted: sha256:25ee02f9e42f8cdca7ca8bc522cb69ac4a86a55401818a13c7a01e52a81894fe
Deleted: sha256:b1d2bc3292aa3d64794f99d2885d35b454993b4af24ad350a969d27925db7ebb
Deleted: sha256:4216e20d59f9fc90bccdd14493452532806d4803a25514366de2a9c5560624d0
Deleted: sha256:d0fe97fa8b8cefdffcef1d62b65aba51a6c87b6679628a2b50fc6a7a579f764c
[root@localhost overlay2]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
[root@localhost overlay2]# docker load < /opt/nginx ##載入映象
d0fe97fa8b8c: Loading layer 72.49MB/72.49MB
2baf69a23d7a: Loading layer 64.54MB/64.54MB
2f57e21e4365: Loading layer 3.072kB/3.072kB
aee208b6ccfb: Loading layer 4.096kB/4.096kB
7b5417cae114: Loading layer 3.584kB/3.584kB
Loaded image: nginx:web
[root@localhost overlay2]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
nginx web c39a868aad02 3 days ago 133MB
四 上傳映象
[root@localhost overlay2]# docker tag nginx:web cwj/nginx:web[root@localhost overlay2]# 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:
Password:
docker push cwj/nginx:web ##上傳映象
五 容器匯出，匯入
[root@localhost overlay2]# docker export f9eaf968d810 > nginx_c ##容器匯出[root@localhost overlay2]# ll
總用量 132172
drwx------ 4 root root 58 11月 9 18:50 distribution
drwx------ 4 root root 37 11月 9 17:36 imagedb
drwx------ 5 root root 45 11月 9 19:19 layerdb
-rw-r--r-- 1 root root 135337984 11月 9 19:56 nginx_c
-rw------- 1 root root 660 11月 9 19:43 repositories.json
[root@localhost overlay2]# docker stop f9eaf968d810 ##刪除容器前一定要先停止執行
f9eaf968d810
[root@localhost overlay2]# docker rm f9eaf968d810 ##刪除容器
f9eaf968d810
[root@localhost overlay2]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
nginx web c39a868aad02 3 days ago 133MB
centos 7 7e6257c9f8d8 3 months ago 203MB
paigeeworld/centos7 latest 4cbe7aa905e7 6 years ago 382MB
[root@localhost overlay2]# docker rmi c39a868aad02
Untagged: nginx:web
Deleted: sha256:c39a868aad02a383c7e490e0fc4a5b0217f667f2de764bc2755e315a5adf64a1
Deleted: sha256:1af47386c12cb24b362bd785e71058ab675fbdcbda8e7a7ba0dd10c3cff75a2a
Deleted: sha256:25ee02f9e42f8cdca7ca8bc522cb69ac4a86a55401818a13c7a01e52a81894fe
Deleted: sha256:b1d2bc3292aa3d64794f99d2885d35b454993b4af24ad350a969d27925db7ebb
Deleted: sha256:4216e20d59f9fc90bccdd14493452532806d4803a25514366de2a9c5560624d0
Deleted: sha256:d0fe97fa8b8cefdffcef1d62b65aba51a6c87b6679628a2b50fc6a7a579f764c
[root@localhost overlay2]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
centos 7 7e6257c9f8d8 3 months ago 203MB
paigeeworld/centos7 latest 4cbe7aa905e7 6 years ago 382MB
[root@localhost overlay2]# cat nginx_c | docker import - nginx:web ##容器匯入，只會生成映象，而不會建立容器
sha256:71f2ea5d8f475762fd9704c3c88560340a0b4d53d7d570ece6fb1f99c6607629
[root@localhost overlay2]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
nginx web 71f2ea5d8f47 10 seconds ago 131MB
centos 7 7e6257c9f8d8 3 months ago 203MB
paigeeworld/centos7 latest 4cbe7aa905e7 6 years ago 382MB