Mirroring common operations Docker

First, get a mirror

Fetching an image command from the Docker mirror warehouse docker pull. The command format is:

docker pull [选项] [Docker Registry 地址[:端口号]/]仓库名[:标签]

such as:

$ docker pull ubuntu:16.04
16.04: Pulling from library/ubuntu
bf5d46315322: Pull complete
9f13e0ac480c: Pull complete
e8988b5b3097: Pull complete
40af181810e7: Pull complete
e6f7c7e5c03e: Pull complete
Digest: sha256:147913621d9cdea08853f6ba9116c2e27a3ceffecf3b492983ae97c3d643fbbe
Status: Downloaded newer image for ubuntu:16.04

The above command is not given warehouse address Docker mirror, the mirror will therefore be acquired from Docker Hub. The name is a mirror ubuntu:16.04, so the mirror will get the official library/ubunturepository for the label 16.04's image.

Second, the run-time image

To the above ubuntu:16.04example, if we're going to start inside bashand interactive operation, you can execute the following command.

$ docker run -it --rm \
    ubuntu:16.04 \
    bash

root@e7009c6ce357:/# cat /etc/os-release
NAME="Ubuntu"
VERSION="16.04.4 LTS, Trusty Tahr"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.4 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"

docker run Is the command to run the container, here we briefly explain the parameters used above.

• -it: These are two parameters, a is -i: interactive operation, one is -tterminal. We intend to enter here bashto execute commands and return the results to see, so we need interactive terminals.
• --rm: This parameter is to say after the vessel exit will be deleted. By default, the demand for troubleshooting, exit the container does not delete immediately, unless manually docker rm. We are here only just execute a command, look at the results, does not require troubleshooting and retention results, so use --rmto avoid wasting space.
• ubuntu:16.04: This is a ubuntu:16.04mirror image basis starting container.
• bash: The image name is placed in command , here we want to have an interactive Shell, so use is bash.

After entering the container, we can operate under the Shell, execute any desired command. Here, we have implemented cat /etc/os-release, which is commonly used Linux command to view the current version of the system, from the returned results can be seen within the container is a Ubuntu 16.04.4 LTSsystem.

Finally, exitexit the container.

Third, the listed mirrors

To list already downloaded the image, you can use the docker image lscommand.

$ docker image ls
REPOSITORY           TAG                 IMAGE ID            CREATED             SIZE
redis                latest              5f515359c7f8        5 days ago          183 MB
nginx                latest              05a60462f8ba        5 days ago          181 MB
mongo                3.2                 fe9198c04d62        5 days ago          342 MB
<none>               <none>              00285df0df87        5 days ago          342 MB
ubuntu               16.04               f753707788c5        4 weeks ago         127 MB
ubuntu               latest              f753707788c5        4 weeks ago         127 MB
ubuntu               14.04               1e0c3dd64ccd        4 weeks ago         188 MB

The list contains the 仓库名, 标签, 镜像 ID, 创建时间and 所占用的空间.

Fourth, delete local mirror

If you want to delete the local mirror, you can use the docker image rmcommand in the format:

$ docker image rm [选项] <镜像1> [<镜像2> ...]

Wherein, <镜像>it may be 镜像短 ID, 镜像长 ID, 镜像名or 镜像摘要.