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Starting up a development environment.

You can start up a temporary development environment by going to Play with Docker, you'll need to setup an account. Your session will last 4 hours before it's reset, you can drag files onto the session or if you have an external repository such as gitlab.com or github.com you can run a git clone to pull any projects in.

1. Run an image.

A Docker container must have something to do, if the last instruction you give a docker container is to upgrade a package it would run the upgrade and then shut down. I'll use this image as an example nginx:alpine. If you look at it's Docker file the last command is to start up nginx CMD ["nginx", "-g", "daemon off;"]. In the play with docker console run docker run -p 8080:80 nginx:alpine. Near the top you should see the port number 8080 appear, if you click on it you'll get to the nginx test page.

  • docker run - Tells Docker to run a command.
  • -p 8080:80 - Maps the docker containers port 80 to the hosts port 8080.
  • nginz:alpine - The container to use.

2. Getting into the running image.

Start the above docker container but daemonize it with a -d so docker run -p 8080:80 -v $(pwd):/usr/share/nginx/index -d nginx:alpine.
Run docker ps under NAMES you should see the name of the container.
Run docker exec -it <container name> /bin/sh you should now find yourself in the shell of the running container.
Make a change to the web page displayed on port 8080 using vi vi /usr/share/nginx/html/index.html and change something, for example:

change
<h1>Welcome to nginx!</h1>
to
<h1>Hello, Welcome to nginx!</h1>

3. Copying a file in

Create a new index.html file for nginx;

<!DOCTYPE html>
<html>
<body>
<h1>Welcome to my nginx page!</h1>
</body>
</html>

Save it to the play with Docker console and run docker run -p 8080:80 -v $(pwd)/index.html:/usr/share/nginx/html/index.html -d nginx:alpine
The web page that is displayed should now show your message.

4. Using a Docker file

A docker file can be used to create a new docker container. make a new file called dockerfile and add the following:

FROM nginx:apline

COPY ./index.html /usr/share/nginx/html/index.html

CMD ["nginx", "-g", "daemon off;"]

Create the index.html file that docker is going to add to the new image:

<!DOCTYPE html>
<html>
<body>
<h1>Welcome to my nginx page!</h1>
</body>
</html>

Now build the new image docker build -t "test:dockerfile" and run it docker run -p 8080:80 -d test:dockerfile.

5. Using a Docker compose

Rather than dealing with increasingly long command lines to more complex Docker containers everything can be put into a docker compose file e.g.

version: '3'
services:
  nginx:
    image: nginx:alpine
    ports:
      - 8001:80

5. Local monitoring

This is publicly available project that can creates some containers on a docker host to monitor other docker containers, possibly useful in helping debug more complex testing developement environments github.com/stefanprodan.