colors_app

Dummy nodejs application which returns a colored paged based on color found in a variable environment. Variable name is "COLOR". If COLOR is empty, then "white" is used. A color could be in the HTML form: COLOR=#0f0f0f

It is possible to pass some query string parameters to alter the behavior of the application:

• 'burncpu' will make the application to compute square roots and consume a lot of CPU resources

Its main purpose is to be used for demos :)

Building the container

Clone this repository, go into the directory and run a command like: docker build --tag colors .

One can also use the docker-compose.yml file provided here: docker-compose build

Using the container

Normal usage

Use a command like this one:

docker run --detach --rm=true --name=colors --env=blue --hostname=colors colors

Or use docker-compose:

docker-compose up -d

Debugging

Use a command like this one:

docker run -it --rm=true --name=colors --hostname=colors --env=blue --entrypoint=sh colors

Or use docker-compose:

docker-compose up

Client

Run:

wrk 'http://127.0.0.1:8080/'

To simulate high CPU usage:

wrk 'http://127.0.0.1:8080/?burncpu=true'