gocker

gocker

Gocker collects logs from running Docker containers and sends them to storage. It currently supports Elasticsearch 6.x and Kafka.

Description

The application retrieves information about active Docker containers using the Docker API.

containers, err := cli.ContainerList(context.Background(), types.ContainerListOptions{})

For each running container (unless explicitly marked for exclusion in the configuration), a new Go routine is spawned to handle log collection.

Each routine:
Use tail to fetch from each log.

func ReadLog(container Docker, logsChan chan storage.DockerLog) {

Parse log and send via channel to storage.

logsChan <- parseLog(rawLog, container)

Usage

go build
./gocker #user must have docker priviledges 

check logs

2020-05-18 17:12:40 [INFO] Starting
2020-05-18 17:12:45 [INFO] Start log collecting on 192.168.1.182
2020-05-18 17:15:45 [INFO] New docker found nginx
2020-05-18 17:15:45 [INFO] read docker log file /var/lib/docker/containers/d9789310fddb3d2c75c087d3ca68bfff4ae92166e5159b2dab0777a4f85e1bf3/d9789310fddb3d2c75c087d3ca68bfff4ae92166e5159b2dab0777a4f85e1bf3-json.log

If you get errors like

Error response from daemon: client version 1.41 is too new. Maximum supported API version is 1.40

Force API with following ENV variable

export DOCKER_API_VERSION='1.40'

Elasticserach template

Use storage/es-template.tpl template to define ES mappings

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

License

MIT