When we set up a python3.6 environment on a computer, next time we change a computer or switch to a linux system, we have to build it again, set environment variables, download pip and other operations.
After a while, pip.exe could not be found in the Scrips directory, and pip is not an internal or external command, and pip: command not found. If the environment is installed too many, it is a bitter tear.
Setting up an environment has become an obstacle for many small partners to learn. Starting from today to learn docker, I will say goodbye to you for environmental issues~~~
docker search: Search for the specified image from Docker Hub (https://hub.docker.com)
For example, I search here for a python3.6 version installed based on the centos7 environment
For automated builds, you can check the official documentation: https://docs.docker.com/docker-hub/builds/#how-automated-builds-work
docker search python
[ root@yoyo ~]# docker search python
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
python Python is an interpreted, interactive, objec… 4288[OK]
django Django is a free web application framework, … 847[OK]
pypy PyPy is a fast, compliant alternative implem… 193[OK]
kaggle/python Docker image for Python scripts run on Kaggle 123[OK]
arm32v7/python Python is an interpreted, interactive, objec… 37
centos/python-35-centos7 Platform for building and running Python 3.5… 36
joyzoursky/python-chromedriver Python with Chromedriver,for running automa… 33[OK]
circleci/python Python is an interpreted, interactive, objec… 29
nikolaik/python-nodejs Python with Node.js 18[OK]
arm64v8/python Python is an interpreted, interactive, objec… 17
centos/python-36-centos7 Platform for building and running Python 3.6… 17
centos/python-27-centos7 Platform for building and running Python 2.7… 15
iron/python Tiny Python Microcontainer 9
publicisworldwide/python-conda Basic Python environments with Conda.6[OK]
dockershelf/python Repository for docker images of Python. Test… 4[OK]
i386/python Python is an interpreted, interactive, objec… 3
bitnami/python Bitnami Python Docker Image 3[OK]
komand/python-plugin DEPRECATED: Komand Python SDK 2[OK]
centos/python-34-centos7 Platform for building and running Python 3.4… 2
muccg/python-base Base images that use python 1[OK]
amd64/python Python is an interpreted, interactive, objec… 1
ccitest/python CircleCI test images for Python 0[OK]
saagie/python Repo for python jobs 0
qbtrade/python python 3.6.5with requirements last update s… 0
openshift/python-33-centos7 DEPRECATED: A Centos7 based Python v3.3 imag… 0[root@yoyo ~]#
The mirror image centos/python-36-centos7 found above that you want to download, then download it to your local
docker pull centos/python-36-centos7
[ root@yoyo ~]# docker pull centos/python-36-centos7
Using default tag: latest
latest: Pulling from centos/python-36-centos7
8 ba884070f61: Pull complete
c3dca185eb14: Pull complete
ee720ba20823: Pull complete
497 ef6ea0fac: Pull complete
ebf1fb961f61: Pull complete
b8249f70ce00: Pull complete
ebd817e2efe7: Pull complete
d3d10dd0937c: Pull complete
a8ad47ec8182: Pull complete
Digest: sha256:d10c46b6db436357965a96716e9f5d230d9b1a58c6db1f0c4f43c1fb1994cd79
Status: Downloaded newer image for centos/python-36-centos7:latest
[ root@yoyo ~]#
Use docker images to view the locally downloaded image
docker images
[ root@yoyo ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
centos/python-36-centos7 latest b8d15efaa8ec 2 months ago 651MB
ubuntu 15.10 9b9cb95443b5 2 years ago 137MB
training/webapp latest 6fae60ef3446 4 years ago 349MB
Docker will run processes in isolated containers. When running the docker run command, Docker will start a process and allocate its exclusive file system, network resources, and process group with this process as the root process for this process.
When the container is started, the image may have defined the binary file to be run, the exposed network port, etc., but the user can redefine it through the docker run command
The format of the most basic docker run command is as follows:
$ sudo docker run [OPTIONS] IMAGE[:TAG] [COMMAND] [ARG…]
For example, I want to start centos7 here, enter the interactive mode, and use the two parameters -i -t of docker to enable the container running by docker to achieve the ability to "talk"
docker run -i -t centos/python-36-centos7 /bin/bash
After entering the centos terminal as follows, enter the python interactive environment and print "hello world! I'm comming!!!", and finally exit with exit
[ root@yoyo ~]# docker run -i -t centos/python-36-centos7 /bin/bash(app-root) python
Python 3.6.3(default, Mar 202018,13:50:41)[GCC 4.8.520150623(Red Hat 4.8.5-16)] on linux
Type "help","copyright","credits" or "license"for more information.>>>print("hello world! I’m comming!!!")
hello world! I’m comming!!!>>>exit()(app-root) exit
Run plus -i -t is to enter the interactive mode. If you don't want to enter the interactive mode to execute the script directly, you can use run directly, such as echo "hello world", the screen will output "hello world"
docker run centos/python-36-centos7 /bin/echo “hello world”
If you don’t want to execute in the foreground, generally our operating environment will choose to hang the background, just add a -d parameter
docker run centos/python-36-centos7 /bin/echo “hello world”
[ root@yoyo ~]# docker run centos/python-36-centos7 /bin/echo "hello world"
hello world
[ root@yoyo ~]# docker run -d centos/python-36-centos7 /bin/echo "hello world"
1 e5c22451bf2215f6c098e066b74363f1db9cde97e9ecea02947ccbbf2fa7e8f
[ root@yoyo ~]#
After using the -d background execution, you will find a long list below, this is the unique id of the container, you can find the container through this id
Run training/webapp first
docker run -d -p 5000:5000 training/webapp python app.py
Use docker ps to view the running container
docker ps
[ root@yoyo ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS
c9e8a325b145 training/webapp "python app.py"16 hours ago Up 16 hours 0.0.0.0:32768->5000/tcp
[ root@yoyo ~]#
The above echo "hello world" is just a very simple output command, it will be closed after execution, so ps can not find what is running, you can add a -a parameter to display all containers, including those that are not running
ps Find parameter related syntax
docker ps -a
[ root@yoyo ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
1 e5c22451bf2 centos/python-36-centos7 "container-entrypoin…"10 minutes ago Exited(0)10 minutes ago hopeful_poincare
1 d14dd77352f centos/python-36-centos7 "container-entrypoin…"12 minutes ago Exited(0)12 minutes ago nervous_visvesvaraya
fefdcbb9c662 centos/python-36-centos7 "container-entrypoin…"13 minutes ago Exited(0)13 minutes ago quirky_cray
9 df329b5effd centos/python-36-centos7 "container-entrypoin…"13 minutes ago Exited(0)13 minutes ago nifty_roentgen
c9e8a325b145 training/webapp "python app.py"16 hours ago Up 16 hours 0.0.0.0:32768->5000/tcp kind_kirch
[ root@yoyo ~]#
This will find the container id 1e5c22451bf2 above, but it is not that long
You can check the running log by the container id
docker logs [container id]
[ root@yoyo ~]# docker logs 1e5c22451bf2
hello world
[ root@yoyo ~]#
You can also view it by the name of the container. Note that this is the name of the container, not the image name. The container name is automatically assigned by the system, such as the last NAMES value hopeful_poincare above
[ root@yoyo ~]# docker logs hopeful_poincare
hello world
**- f: Let docker logs output the standard output inside the container like tail -f. **
docker logs -f 1e5c22451bf2
You can use ps to view the running container
docker ps
[ root@yoyo ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c9e8a325b145 training/webapp "python app.py"17 hours ago Up 17 hours 0.0.0.0:32768->5000/tcp kind_kirch
To stop the container, you can use the id of the stop container or the name of the container
docker stop c9e8a325b145
Or provide the container name kind_kirch to stop
docker stop kind_kirch
Provide start to start the container
[ root@yoyo ~]# docker start c9e8a325b145
c9e8a325b145
[ root@yoyo ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c9e8a325b145 training/webapp "python app.py"17 hours ago Up 5 seconds 0.0.0.0:32769->5000/tcp kind_kirch
[ root@yoyo ~]#
The running container can be restarted with the docker restart command
[ root@yoyo ~]# docker restart c9e8a325b145
c9e8a325b145
[ root@yoyo ~]#
Use the docker rm command to delete unnecessary containers
[ root@yoyo ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
1 e5c22451bf2 centos/python-36-centos7 "container-entrypoin…"24 minutes ago Exited(0)24 minutes ago hopeful_poincare
1 d14dd77352f centos/python-36-centos7 "container-entrypoin…"27 minutes ago Exited(0)27 minutes ago nervous_visvesvaraya
fefdcbb9c662 centos/python-36-centos7 "container-entrypoin…"27 minutes ago Exited(0)27 minutes ago quirky_cray
9 df329b5effd centos/python-36-centos7 "container-entrypoin…"27 minutes ago Exited(0)27 minutes ago nifty_roentgen
c9e8a325b145 training/webapp "python app.py"17 hours ago Up 41 seconds 0.0.0.0:32770->5000/tcp kind_kirch
[ root@yoyo ~]# docker rm 1e5c22451bf2
1 e5c22451bf2
[ root@yoyo ~]# docker rm 1d14dd77352f
1 d14dd77352f
[ root@yoyo ~]# docker rm kind_kirch
Error response from daemon: You cannot remove a running container c9e8a325b14534f0b27cfd34e3ceefd16f6a6c9f136c0305d4e60de61f2badc3. Stop the container before attempting removal or force remove
[ root@yoyo ~]#
But when rm is running in the container, it will report an error, it needs to stop before rm
[ root@yoyo ~]# docker stop kind_kirch
kind_kirch
[ root@yoyo ~]# docker rm kind_kirch
kind_kirch
[ root@yoyo ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
[ root@yoyo ~]#
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