Month: January 2021
Publish Docker Ports
By default, when you create or run a container using docker create or docker run, it does not publish any of its ports to the outside world. To make a port available to services outside of Docker, or to Docker containers which are not connected to the container’s network, use the --publish or -p flag. This creates a firewall rule which maps a container port to a port on the Docker host to the outside world.
Here are some examples.
| Flag value | Description |
|---|---|
-p 8080:80 | Map TCP port 80 in the container to port 8080 on the Docker host. |
-p 192.168.1.100:8080:80 | Map TCP port 80 in the container to port 8080 on the Docker host for connections to host IP 192.168.1.100. |
-p 8080:80/udp | Map UDP port 80 in the container to port 8080 on the Docker host. |
-p 8080:80/tcp -p 8080:80/udp | Map TCP port 80 in the container to TCP port 8080 on the Docker host, and map UDP port 80 in the container to UDP port 8080 on the Docker host. |
Commit Changes to Docker Image
You can create a new docker image by committing the changes in an existing using the following syntax:
sudo docker commit [CONTAINER_ID] [new_image_name]
Suppose there is a running docker with name “existing-image” (you can check with “docker ps -a”), the below common will commit the changes made in the running docker into the “new-image” image.
docker commit existing-image new-image
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Auto Start NodeJS NPM React App after Reboot using PM2
To auto start node.js npm app after reboot, one way is to use pm2.
First instead pm2:
> npm install -g pm2
Configure pm2 to start as root
> pm2 startup -u root
Add the npm app to pm2 (example shown here is a react app, replace “yourapp” with the name of your react app)
> pm2 start node_modules/react-scripts/scripts/start.js –name “yourapp”
Save the configuration
> pm2 save
Now when you reboot the server, your npm app will be automatically run.
Python 3 & Emacs in Docker
1. Create a dockerfile, e.g., mydockerfile with the following content:
FROM alpine:3.7
Maintainer myhlow
RUN apk upgrade –update && apk add python3 python3-dev gcc gfortran freetype-dev musl-dev libpng-dev g++ lapack-dev emacs
RUN pip3 install –upgrade pip
RUN pip3 install virtualenv
RUN pip3 install numpy scipy pandas scikit-learn
2. Build a local Python 3 with Emacs docker image in the same folder as the dockerfile:
docker build -t python_docker_base -f mydockerfile .
3. Run the docker image:
docker run -it python_docker_base:latest
Techucation 