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This project forked from arjunachari12/docker-demo-with-simple-python-app
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docker-demo-with-simple-python-app's Introduction
# python-app-docker-demo
This demo shows two steps:
+ Install `docker-ce` on Centos 7
+ Build and run a simple docker image with a python+flask+gunicorn web application.
## Install docker-ce on Centos 7
Refer to https://docs.docker.com/engine/installation/linux/docker-ce/centos/
You can also find [other OS installation docs from here](https://docs.docker.com/engine/installation).
#### Uninstall old versions
```
$ sudo yum remove docker \
docker-common \
docker-selinux \
docker-engine
```
#### Install using repository
```
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
sudo yum install docker-ce
sudo systemctl start docker
sudo docker run hello-world
```
Other commands:
+ check docker status
```
sudo systemctl status docker.service
```
+ stop docker
```
sudo systemctl stop docker
```
+ uninstall docker-ce
```
sudo yum remove docker-ce
```
+ remove all images, container, volumes
```
sudo rm -rf /var/lib/docker
```
## Build/Run a simple python+flask docker web app
#### Create the Dockerfile
```
FROM python:2.7
# Creating Application Source Code Directory
RUN mkdir -p /usr/src/app
# Setting Home Directory for containers
WORKDIR /usr/src/app
# Installing python dependencies
COPY requirements.txt /usr/src/app/
RUN pip install --no-cache-dir -r requirements.txt
# Copying src code to Container
COPY . /usr/src/app
# Application Environment variables
#ENV APP_ENV development
ENV PORT 8080
# Exposing Ports
EXPOSE $PORT
# Setting Persistent data
VOLUME ["/app-data"]
# Running Python Application
CMD gunicorn -b :$PORT -c gunicorn.conf.py main:app
```
#### Build your image
Normally, image name convention is something like: `
{company/application-name}:{version-number}`. In the demo, I just use `{application-name}:{version-number}`
```
sudo docker build -t my-python-app:1.0.1 .
```
#### check all docker images
```
$ sudo docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
my-python-app 1.0.1 2b628d11ba3a 22 minutes ago 701.6 MB
docker.io/python 2.7 b1d5c2d7dda8 13 days ago 679.3 MB
docker.io/hello-world latest 05a3bd381fc2 5 weeks ago 1.84 kB
```
`2b628d11ba3a` is the image ID, some commands based on the ID.
+ tag
```
sudo docker tag 2b628d11ba3a my-python-app:1.0.1
sudo docker tag 2b628d11ba3a my-python-app:latest
```
+ remove image
```
$ sudo docker rmi --force 2b628d11ba3a
```
#### Run your image
```
$ sudo docker run -d -p 8080:8080 my-python-app:1.0.1
```
You can use `sudo docker ps` to list all running containers.
```
$ sudo docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4de6041072b7 my-python-app:1.0.1 "/bin/sh -c 'gunicorn" 20 minutes ago Up 20 minutes 0.0.0.0:8080->8080/tcp elegant_kowalevski
```
`4de6041072b7` is the running container id. Some commands below are what you might need.
+ display logs in running container
```
$ sudo docker logs 4de6041072b7
[2017-10-23 20:29:49 +0000] [7] [INFO] Starting gunicorn 19.6.0
[2017-10-23 20:29:49 +0000] [7] [INFO] Listening at: http://0.0.0.0:8080 (7)
[2017-10-23 20:29:49 +0000] [7] [INFO] Using worker: gthread
[2017-10-23 20:29:49 +0000] [11] [INFO] Booting worker with pid: 11
[2017-10-23 20:29:49 +0000] [12] [INFO] Booting worker with pid: 12
```
+ stop your container
```
$ sudo docker stop 4de6041072b7
```
+ login inside the container
```
$ sudo docker exec -it 4de6041072b7 /bin/sh
# ls /usr/src/app
Dockerfile README.md gunicorn.conf.py gunicorn_pid.txt main.py main.pyc requirements.txt
# exit
```
#### Test your application
```
$ curl http://localhost:8080
Hello World
```
# python-sample
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