Implementation of importing and exporting docker images

Implementation of importing and exporting docker images

Docker usage of gitlab

gitlab docker

Startup Command

docker run -d -p 3000:80 twang2218/gitlab-ce-zh:9.0.3

docker run -d -p 8080:80 gitlab/gitlab-ce:latest

Commit container changes to the image

# Enter the container [root@#localhost docker]# docker run -ti ubuntu:14.04 /bin/bash
root@812a997f614a:/#id 
uid=0(root) gid=0(root) groups=0(root)

# Made some changes root@812a997f614a:/# echo update>update.txt
root@812a997f614a:/# exit
exit

[root@#localhost docker]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
812a997f614a ubuntu:14.04 "/bin/bash" 7 minutes ago Exited (0) 22 seconds ago zealous_euler
69304dea46c7 gitlab/gitlab-ce:latest "/assets/wrapper" About an hour ago Exited (127) 44 minutes ago competent_minsky
67ba866e21b0 gitlab/gitlab-ce:latest "/assets/wrapper" 2 hours ago Exited (137) About an hour ago hungry_hoover
2a3d08a0a2ff twang2218/gitlab-ce-zh:9.0.3 "/assets/wrapper" 2 hours ago Exited (137) About an hour ago nervous_wozniak
6db49540be99 twang2218/gitlab-ce-zh:9.0.3 "/assets/wrapper" 2 hours ago Exited (255) 2 hours ago 22/tcp, 443/tcp, 0.0.0.0:3000->80/tcp romantic_elion
b08a6d6ed716 gitlab/gitlab-ce:latest "/assets/wrapper" 2 hours ago Exited (255) 2 hours ago 22/tcp, 443/tcp, 0.0.0.0:8080->80/tcp competent_brahmagupta
33fd0b1ebd27 gitlab/gitlab-ce:latest "/assets/wrapper" 2 hours ago Exited (127) 2 hours ago loving_brattain
6f53620a930c twang2218/gitlab-ce-zh:9.0.3 "/assets/wrapper" 3 hours ago Exited (127) 2 hours ago brave_galileo
88df78f77c4e ubuntu:14.04 "sleep 360" 4 days ago Exited (137) 4 days ago testcopy
81a879a36bd3 wordpress "docker-entrypoint..." 4 days ago Exited (0) 4 days ago wordpress
a57a3cc492b7 mysql "docker-entrypoint..." 4 days ago Exited (0) 4 days ago mysqlwp

# Save the modified image as a new [root@#localhost docker]# docker commit 812a997f614a ubuntu:update
sha256:317f102584605694da424bc96764559a1ccfda13943353f4cbdfd89c96515e6b

[root@#localhost docker]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
ubuntu update 317f10258460 5 seconds ago 188 MB
twang2218/gitlab-ce-zh 9.0.3 36172b5fefab 44 hours ago 1.19 GB
gitlab/gitlab-ce latest 5eff2e44957c 2 days ago 1.11 GB
mysql latest 9546ca122d3a 8 days ago 407 MB
wordpress latest 4ad41adc2794 2 weeks ago 401 MB
ubuntu 14.04 7c09e61e9035 5 weeks ago 188 MB
daocloud.io/library/nginx 1.7.1 e3e043d3ed2f 2 years ago 499 MB

# View the differences between the modified image and the original image [root@#localhost docker]# docker diff 812a997f614a
C /var
C /var/cache
C /var/cache/apt
D /var/cache/apt/srcpkgcache.bin
D /var/cache/apt/pkgcache.bin
C /var/lib
C /var/lib/apt
C /var/lib/apt/lists
A /var/lib/apt/lists/lock
A /var/lib/apt/lists/partial
A /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_trusty-updates_InRelease
A /update.txt
C /root
A /root/.bash_history
[root@#localhost docker]#

Importing and exporting images

export and improt

[root@#localhost docker]# docker run -ti ubuntu:update /bin/bash
root@cbe3cb7799ed:/# ls
bin boot dev etc home lib lib64 media mnt opt ​​proc root run sbin srv sys tmp update.txt usr var

[root@#localhost docker]# 
[root@#localhost docker]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cbe3cb7799ed ubuntu:update "/bin/bash" 47 seconds ago Exited (1) 6 seconds ago adoring_kare
812a997f614a ubuntu:14.04 "/bin/bash" 16 minutes ago Exited (0) 8 minutes ago zealous_euler
69304dea46c7 gitlab/gitlab-ce:latest "/assets/wrapper" 2 hours ago Exited (127) 53 minutes ago competent_minsky
67ba866e21b0 gitlab/gitlab-ce:latest "/assets/wrapper" 2 hours ago Exited (137) 2 hours ago hungry_hoover
2a3d08a0a2ff twang2218/gitlab-ce-zh:9.0.3 "/assets/wrapper" 2 hours ago Exited (137) 2 hours ago nervous_wozniak
6db49540be99 twang2218/gitlab-ce-zh:9.0.3 "/assets/wrapper" 2 hours ago Exited (255) 2 hours ago 22/tcp, 443/tcp, 0.0.0.0:3000->80/tcp romantic_elion
b08a6d6ed716 gitlab/gitlab-ce:latest "/assets/wrapper" 2 hours ago Exited (255) 2 hours ago 22/tcp, 443/tcp, 0.0.0.0:8080->80/tcp competent_brahmagupta
33fd0b1ebd27 gitlab/gitlab-ce:latest "/assets/wrapper" 3 hours ago Exited (127) 2 hours ago loving_brattain
6f53620a930c twang2218/gitlab-ce-zh:9.0.3 "/assets/wrapper" 3 hours ago Exited (127) 2 hours ago brave_galileo
88df78f77c4e ubuntu:14.04 "sleep 360" 4 days ago Exited (137) 4 days ago testcopy
81a879a36bd3 wordpress "docker-entrypoint..." 4 days ago Exited (0) 4 days ago wordpress
a57a3cc492b7 mysql "docker-entrypoint..." 4 days ago Exited (0) 4 days ago mysqlwp

# Export the image to a file [root@#localhost docker]# docker export cbe3cb7799ed > update.tar


# Create a new static image based on the exported file [root@#localhost /]# docker import - update < update.tar 
sha256:fd00d520a43eb5dc6cca8717fe0ca04cfdc53b02cad2fb5b50d877b8e6d6c3bc
[root@#localhost /]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
update latest fd00d520a43e 13 seconds ago 165 MB
ubuntu update 317f10258460 11 minutes ago 188 MB
twang2218/gitlab-ce-zh 9.0.3 36172b5fefab 44 hours ago 1.19 GB
gitlab/gitlab-ce latest 5eff2e44957c 2 days ago 1.11 GB
mysql latest 9546ca122d3a 8 days ago 407 MB
wordpress latest 4ad41adc2794 2 weeks ago 401 MB
ubuntu 14.04 7c09e61e9035 5 weeks ago 188 MB
daocloud.io/library/nginx 1.7.1 e3e043d3ed2f 2 years ago 499 MB
[root@#localhost /]#

save and load

(like when backing up and restoring with mirroring)

# update is an existing image [root@#localhost /]# docker save -o update1.tar update
[root@#localhost /]# ls
bin boot dev etc home lib lib64 media mnt opt ​​proc root run sbin srv sys tmp update1.tar update.tar usr var
[root@#localhost /]# du -sh update1.tar 
166M update1.tar

# Delete the update image [root@#localhost /]# docker rmi update
Untagged: update:latest
Deleted: sha256:fd00d520a43eb5dc6cca8717fe0ca04cfdc53b02cad2fb5b50d877b8e6d6c3bc
Deleted: sha256:14cc8cd7b783152682835346e5fe90860a9feeb684866688692285319d4e97ad

[root@#localhost /]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
ubuntu update 317f10258460 16 minutes ago 188 MB
twang2218/gitlab-ce-zh 9.0.3 36172b5fefab 44 hours ago 1.19 GB
gitlab/gitlab-ce latest 5eff2e44957c 2 days ago 1.11 GB
mysql latest 9546ca122d3a 8 days ago 407 MB
wordpress latest 4ad41adc2794 2 weeks ago 401 MB
ubuntu 14.04 7c09e61e9035 5 weeks ago 188 MB
daocloud.io/library/nginx 1.7.1 e3e043d3ed2f 2 years ago 499 MB

#Import the image [root@#localhost /]# docker load < update1.tar 
14cc8cd7b783: Loading layer [====================================================>] 173.8 MB/173.8 MB
Loaded image: update:latest
[root@#localhost /]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
update latest fd00d520a43e 6 minutes ago 165 MB
ubuntu update 317f10258460 17 minutes ago 188 MB
twang2218/gitlab-ce-zh 9.0.3 36172b5fefab 44 hours ago 1.19 GB
gitlab/gitlab-ce latest 5eff2e44957c 2 days ago 1.11 GB
mysql latest 9546ca122d3a 8 days ago 407 MB
wordpress latest 4ad41adc2794 2 weeks ago 401 MB
ubuntu 14.04 7c09e61e9035 5 weeks ago 188 MB
daocloud.io/library/nginx 1.7.1 e3e043d3ed2f 2 years ago 499 MB
[root@#localhost /]#

Dockerfile

[root@#localhost ~]# mkdir docker_file
[root@#localhost ~]# cd docker_file/

[root@#localhost docker_file]# vi Dockerfile 

[root@#localhost docker_file]# cat Dockerfile 
FROM ubuntu:14.04

ENTRYPOINT ["/bin/echo"]

[root@#localhost docker_file]# docker build .
Sending build context to Docker daemon 2.048 kB
Step 1/2: FROM ubuntu:14.04
 ---> 7c09e61e9035
Step 2/2: ENTRYPOINT /bin/echo
 ---> Running in d53f31b93355
 ---> 26dd06d2e5a5
Removing intermediate container d53f31b93355
Successfully built 26dd06d2e5a5

#Run the image [root@#localhost docker_file]# docker run 26dd06d2e5a5

#Add a parameter [root@#localhost docker_file]# docker run 26dd06d2e5a5 hello world
hello world
[root@#localhost docker_file]# vi Dockerfile 
[root@#localhost docker_file]# docker run 26dd06d2e5a5 hello world
hello world


#
[root@#localhost docker_file]# cat Dockerfile 
FROM ubuntu:14.04

#ENTRYPOINT ["/bin/echo","Hi world!"]
CMD ["/bin/echo","Hi world!"]

[root@#localhost docker_file]# docker build .
[root@#localhost docker_file]# docker run 12458a717ced
Hi world!


[root@#localhost docker_file]# docker run 12458a717ced /bin/date 
Sat Apr 8 12:08:14 UTC 2017

Add a tag when building

[root@#localhost docker_file]# docker build -t yang:01 .
Sending build context to Docker daemon 3.584 kB
Step 1/2: FROM ubuntu:14.04
 ---> 7c09e61e9035
Step 2/2 : CMD /bin/echo Hi world!
 ---> Running in 94e510f085d7
 ---> 6b33c8a6a32f
Removing intermediate container 94e510f085d7
Successfully built 6b33c8a6a32f
[root@#localhost docker_file]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
yang 01 6b33c8a6a32f 5 seconds ago 188 MB
update latest fd00d520a43e 29 minutes ago 165 MB
ubuntu update 317f10258460 41 minutes ago 188 MB
twang2218/gitlab-ce-zh 9.0.3 36172b5fefab 44 hours ago 1.19 GB
gitlab/gitlab-ce latest 5eff2e44957c 2 days ago 1.11 GB
mysql latest 9546ca122d3a 8 days ago 407 MB
wordpress latest 4ad41adc2794 2 weeks ago 401 MB
ubuntu 14.04 7c09e61e9035 5 weeks ago 188 MB
daocloud.io/library/nginx 1.7.1 e3e043d3ed2f 2 years ago 499 MB
[root@#localhost docker_file]#

Build an example

Package the flask application into the image

Write the Python program hellp.py

#!/usr/bin/env python

from flask import Flask
app = Flask(__name__)

@app.route('/hi')
def hello_world():
  return 'Hello World!'

if __name__ == '__main__':
  app.run(host='0.0.0.0', port=5000)

Writing a Dockerfile

FROM ubuntu:14.04

RUN apt-get update
RUN apt-get install -y python
RUN apt-get install -y python-pip
RUN apt-get clean all

RUN pip install flask

ADD hello.py /tmp/hello.py

EXPOSE 5000

CMD ["python","/tmp/hello.py"]

This is the end of this article about the implementation of importing and exporting docker images. For more relevant docker image import and export content, please search for previous articles on 123WORDPRESS.COM or continue to browse the following related articles. I hope everyone will support 123WORDPRESS.COM in the future!

You may also be interested in:
  • Docker image and container import and export operations practice
  • Docker image import and export code examples
  • Docker image import, export, backup and migration operations
  • Docker image export, import and copy example analysis
  • How to import and export Docker images
  • How to export and import images between docker
  • Introduction to Docker image import and export process

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