Mirror already exists. Let's learn how to use it.

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Mirror is the most important of the three cores and the most popular keyword since the birth of Docker!

 

Docker needs a local mirror before running the container with the following priority:

1) Locally existing mirrors

2) Default mirror warehouse (default uses the warehouse in the Docker Hub public registration server)

3) User-defined Configuration - Use a custom mirror warehouse

 

This chapter describes the specific operations around the core concept of mirroring, including how to download mirrors from the Docker Hub repository to the local location using the pull command, how to view and manage the local existing mirroring information, how to search and filter using the search command in the remote repository, how to delete mirroring tags and mirroring files, how to create user-customized mirrors and save themSave as an external file.Finally, it shows you how to push your own mirror into the Docker Hub repository.

 

3.1 Getting Mirrors

Mirrors are a prerequisite for running containers. Officials have provided hundreds of thousands of mirrors for everyone to download openly!

docker images
REPOSITORY            TAG                 IMAGE ID            CREATED             SIZE
myspringboot/0.1      latest              c457facb0530        36 minutes ago      518MB
myspringboot/latest   latest              06146e591750        About an hour ago   518MB
<none>                <none>              21016d598a9d        3 days ago          120MB
ubuntu                latest              14f60031763d        11 days ago         120MB
root@myhost:~/docker_image_test/myspringboot# docker rmi 21016d598a9d
Error response from daemon: conflict: unable to delete 21016d598a9d (must be forced) - image is being used by stopped container e1271e25af7f
root@myhost:~/docker_image_test/myspringboot# docker pull ubuntu:14.04
14.04: Pulling from library/ubuntu
7ee37f181318: Pull complete 
df5ffabe5e97: Pull complete 
ae2040ed51a1: Pull complete 
3ce7010d244b: Pull complete 
2538b201d2a6: Pull complete 
Digest: sha256:13eecbc0e57928c1cb3ccca3581e2a6f4b0f39c1acf5a279e740e478accd119b
Status: Downloaded newer image for ubuntu:14.04
root@myhost:~/docker_image_test/myspringboot# docker images
REPOSITORY            TAG                 IMAGE ID            CREATED             SIZE
myspringboot/0.1      latest              c457facb0530        37 minutes ago      518MB
myspringboot/latest   latest              06146e591750        About an hour ago   518MB
<none>                <none>              21016d598a9d        3 days ago          120MB
ubuntu                latest              14f60031763d        11 days ago         120MB
ubuntu                14.04               54333f1de4ed        11 days ago         188MB

If the tag is not specified explicitly, the latest tag is selected by default to download the latest version of the image

 

===Container

Containers are another core concept.

Simply put, a running instance of a container is mirrored, unlike static, read-only files, where the container has a writable file layer for runtime needs.

4.1 Create Containers

Operating containers is as simple and fast as directly operating applications.Docker containers are so lightweight that users can create or delete them at any time!

1 New Container

docker images
REPOSITORY            TAG                 IMAGE ID            CREATED             SIZE
myspringboot/0.1      latest              c457facb0530        2 hours ago         518MB
myspringboot/latest   latest              06146e591750        2 hours ago         518MB
<none>                <none>              21016d598a9d        3 days ago          120MB
ubuntu                latest              14f60031763d        11 days ago         120MB
ubuntu                14.04               54333f1de4ed        11 days ago         188MB
root@myhost:~/docker_image_test/myspringboot# docker create -it myspringboot/0.1
6e23d132b2ae736729e9ca6f5b01651eeb9f34433348460e3b5749c4e1e11f54
root@myhost:~/docker_image_test/myspringboot# docker ps-a
docker: 'ps-a' is not a docker command.
See 'docker --help'
root@myhost:~/docker_image_test/myspringboot# docker ps -a
CONTAINER ID        IMAGE               COMMAND                   CREATED             STATUS                      PORTS               NAMES
6e23d132b2ae        myspringboot/0.1    "./run.sh"                9 seconds ago       Created      

At this point, the container is stopped and can be started using the docker start command

docker start fervent_montalcini
fervent_montalcini

Well, what about the startup container?

docker ps 
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

===After a lot of hassles, offer the full executable version

cat run.sh
#!/bin/bash
java -cp ./ -jar app.jar

 cat ddddir/Dockerfile 
FROM ubuntu
MAINTAINER liuzhq 837500869@qq.com

#RUN apt-get update &&  apt-get install maven	
#RUN mvn  -X clean compile package -DskipTests=true
VOLUME /tmp
#RUN ls -al
RUN echo "begin to create docker image" &&  apt-get -y update && apt-get -y install openjdk-8-jdk

#COPY ./target/myspringboot-0.2-SNAPSHOT.jar  ./app.jar
COPY */*.jar ./app.jar
COPY */*/application*.properties ./
COPY *.sh ./
RUN chmod +x *.sh
RUN touch ./log.log
RUN chmod +x *.log
EXPOSE 9990

CMD ["./run.sh"]

create mirror

docker build -t myspringboot/0.6  -f ./ddddir/Dockerfile  ./

One-click Start

iptables -I INPUT -p tcp --dport 9990  -j ACCEPT

 docker run -it -p 9990:9990 myspringboot/0.6:latest

Perfect!