docker--image management of PAAs architecture

1. Image Management 1.1. List Mirrors

Sudo Docker Images

1.2. View the image

Sudo Docker images xxxx

　　

1.3. Pull the image

Sudo Docker pull Ubuntu

1.4. Find the image

Sudo Docker Search MySQL

　　

1.5. Remove the image

sudo docker RMI xxxxx (Force)

　　

1.6. Build the mirrored 1.6.1. Docker Commit

Deprecated, it is recommended to use Docker build+ Docker file

1.6.2. Docker Build + Dockerfile

Create a Static_web directory

To create a dockerfile configuration file:

　　

Build:

1.6.3. Building images from a git repository

1) git Create Dockerfile

Input file Contents:

# vesion:0.0.1

From ubuntu:14.04

Maintainer Jay Zhan "[Email protected]"

RUN Apt-get install-y Nginx

RUN Echo ' Hi, I am in You container ' >/usr/share/nginx/html/index.html

EXPOSE 8090

　　

2) Get raw links to dockerfile files in GitHub

Https://raw.githubusercontent.com/duruo850/docker/master/test.dockerfile

Shorthand

Https://rawgit.com/duruo850/docker/master/test.dockerfile

3) Use the link build

sudo docker build-t= "Jay/web_from_git" \

Https://rawgit.com/duruo850/docker/master/test.dockerfile

　　

　　

4) View image

5) Cache Mirroring

Every time the build of Docker caches a local mirror, so from which step error, enter the pre-image into the command to know what the problem;

If the build process is the same, the same image will be used

If you do not want to use the cache, such as the Apt-get Update command, the APT package cache will not be refreshed, and the cache should not be used

sudo docker build–no-cache-t= "Jay/web_from_git".

6) boot the container from the mirror

sudo docker run-i-t-p 10080:80--name static_web2 jay/static_web nginx-g "daemon off;"

Map 80 ports of a virtual machine using a host's 10080 port

To view the host's 10080 port effect:

　　

　　

Consistent with the output of our Nginx index.html.

7) Push the image to the Docker hub

Error: Unauthorized:access to the requested resource are not authorized

WORKAROUND: Use Docker login to log in first

Can only be uploaded to the repository of the Docker hub account (Docker hub account/xxxxxx) and cannot be uploaded to the root repository (xxxxx),

　　

　　

Go to the Docker hub account to view the warehouse:

　　

1.6.4. Auto-Build

Source code hosted on GitHub

When GitHub code changes, Dockerhub automatically acquires Dockerfile and automatically builds Docker containers

Github

The GitHub code root directory needs to provide a dockerfile configuration file

　　

DockerHub

　　

　　

　　

　　

　　

　　

1.6.5. dockerfile directive

• CMD command

The CMD directive specifies the command to run when a container starts. This is similar to the Run command, except that the Run command is a command that is built to run. The Run command can overwrite the cmd command

New Dockerfile:

To build the image:

Boot Image:

The Run command overrides:

The LS command overrides the/bin/bash command

• entrypoint command

The only difference between the entrypoint and CMD commands is that they are not overwritten by the Run command

The command line parameters of run are passed to the entrypoint command again as arguments

Run can overwrite the command with the-ENTRYPOINT flag

• Workdir command

Create mirror when building a new container, a working directory is set inside the container, and the entrypoint and/or CMD commands are executed in this directory

Run can overwrite the command with the-W flag

• ENV command

Setting environment variables during the mirroring build process

Environment variables are persisted to any container in the mirrored build

Run can use the-e flag to pass environment variables that will only be valid at run time

• User command

Used to specify the running user of the image

Run can overwrite the variable by using the-u flag

If you do not specify a user group, the default user group is root

• Volume command

Used to add volumes to a mirrored-based container, data sharing capabilities

• Add command

Used to copy files and directories in the build environment into a mirror,

Can add any file of the build environment

Some archive files (GZIP,TAR,XZ,BZIP2) are unpacked and then placed in the target directory

If the directory location does not exist, Docker will create this full path for us,

The add command makes the build cache invalid

• Copy command

Similar to the Add command, but copy does not extract and unpack the archive as it did add

Only files under the build directory can be copied, and Dockerfile in the same directory

If the directory location does not exist, Docker will create this full path for us,

• Onbuild command

Add a trigger for the mirror, and when one mirror is treated as the underlying image of another mirror, the trigger for that mirror will execute

To prevent recursive calls, these commands cannot be used in Onbuild: From, onbuild, maintainer, etc.

docker--image management of PAAs architecture