A tiny, quick-n-dirty Python program which can connect to a Docker host and collect data from the stats API for specific containers.
Be aware that the Docker engine HTTP API on the target host must be enabled and available on the default port 2375 for this application to work.
Configure the following environment variables (by modifying the compose file):
DOCKER_HOST: The address of the Docker host,host.docker.internalfor the own host.CONTAINER_NAMES: The names of the containers for which stats will be collected, comma-separated list.SAVE_INTERVAL: The Docker stats API emits one JSON stats info object per container per second. Specifying the interval determines how many of these objects are saved by the application. An interval of 5 would result in every fifth stats object being saved.
Furthermore, you may want to replace the container_stats volume with a bind mount. This way, the files generated by the application can be placed directly in the host's file system.
Launch the stats collector application by calling docker-compose up -d in the root directory of this project.
By default, the stats of the monitored containers are saved to a JSON file in the named volume specified in the compose file. Each container will have their own file. Be aware that the files are usually broken; they end with a trailing comma and miss a closing bracket.
[{"read":"2021-09-11T16:25:43.393342601Z","preread" ... "tx_dropped":0}}},For fixing the file, replace this comma with a closing square bracket.