Docker Study Notes (3)-Docker images and warehouses

Docker Study Notes (3)-Docker images and warehouses

Images and warehouses

View and delete images

Image storage location/var/lib/docker

List Images

docker images [OPTIONS] [REPOSITORY]

-A,-all = false Show all images (default hides intermediate images)
-Digests = false Show digests
-F,-filter = [] Filter output based on conditions provided
-Help = false Print usage
-No-trunc = false Don't truncate output
-Q,-quiet = false Only show numeric IDs

Image Tag and repository

When running docker images, you can see:

PEROSITORY is the repository and TAG is the TAG.

View images

docker inspect [OPTIONS] CONTAINER|IMAGE [CONTAINER|IMAGE...]

-F,-format = Format the output using the given go template
-Help = false Print usage
-Type = Return JSON for specified type, (e. g image or container)

Delete an image

docker rmi [OPTIONS] IMAGE [IMAGE...]

-F,-force = false Force removal of the image
-Help = false Print usage
-No-prune = false Do not delete untagged parents
 

Retrieve and push images to search for images

docker search [image]

Pull Image

docker pull [image]

-A,-all-tags = false

Acceleration
Use the-registry-mirror Option
1. Modify:/etc/default/docker
2. Add: DOCKER_OPTIOS = "-registry-mirror = http: // XXXX"

Push Image

docker push 

 

Build an image

Docker commitBuild through container
Docker buildDockerfileFile Construction

docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]

-A,-author = Author (e.g., "John Hannibal Smith hannibal@a-team.com ")
-C,-change = [] Apply Dockerfile instruction to the created image
-Help = false Print usage
-M,-message = Commit message
-P,-pause = true Pause container during commit

Example:

docker run -d --name test_web -p 80:80 billvsme/web nginx -g "daemon off;"

 

Use Dockerfile to build an image

docker build [OPTIONS] PATH | URL | -

-No-cache = false Do not use cache when building the image
-Q,-quiet = false Suppress the verbose output generated
-T,-tag = Repository name (and optionally a tag) for the image

Example:

docker build -t ='billvsme/web' ./

 

View the image building process

docker history [image]

 

Dockerfile format

Note

# Comment

Command

FROM

FROM 

FROM: The existing image base image must be the first non-Annotated instruction.

MAINTAINER

MAINTAINER
 
  
Specify the creator of the image to learn the commands run in the current image
 

RUN

RUN 

 
(Shell mode) RUN echo hello RUN ["executable", "param1", "param2"] (exec mode) RUN ["/bin/bash", "-c ", "echo hellow"] EXPOSE specifies the container running port. It only tells docker that the container uses this port, but does not automatically open the port. Instead, it adds the port ing command to the run.

Example:

#First DockerfileFROM ubuntu:14.04MAINTAINER billvsme "994171686@qq.com"RUN apt-get updateRUN apt-get install -y nginxEXPOSE 80

Other commands

CMD

CMD command param1 param2 (shell mode) CMD ['executable', "param1", "param2"] (exec mode) CMD ['param1 ', 'param2'] (as the default parameter of the ENTERYPOINT command) The RUN Command runs during the container build. The CMD command runs when the container runs, if docker run specifies the cmd command, the CMD command will be overwritten.

ENTERYPOINT

ENTERYPOINT command param1 param2 (shell mode) ENTERYPOINT ['executable', "param1", "param2"] (exec mode) the difference with CMD is that ENTERYPOINT will not be overwritten, if you want to overwrite the data, you can use docker run -- entrypoint to overwrite the data.

COPY

COPY
 
  
...
  
   
COPY ["
   
    
"..."
    
     
"] (Applicable when there are spaces in the file path)
    
   
  
 

ADD

ADD is basically the same as COPY, but ADD provides a tar-like decompression function. ADD src can be a url

VOLUME

VOLUME ["/data"] adds a VOLUME to the container

WORKDIR

WORKDIR/path/to/workdir set the working directory inside the container. CMD and ENTERYPOINT will be executed in this directory.

ENV

ENV
 
  
   
ENV
   
    
=
    
     
... Set Environment Variables
    
   
  
 

USER

USER uidUSER uid: gidUSER uid: groupUSER nginx running as nginx is root by default

ONBUILD

ONBUILD [INSTRUCTION] image trigger: This trigger is executed when an image is used as a basic image by another image. When a sub-image is built, the trigger is inserted.