Docker Testing

The Docker orchestration is comprised of the following:

1. A Docker image which has the necessary software to run the LogService
2. A docker-compose.yml file which can launch the necessary containers for a full-fledged LogService “cluster”
3. Scripts to build the Docker image and launch a client environment to interact with a running cluster via Compose.

Building the Docker image

$ mvn clean package assembly:single -DskipTests
$ cd ratis-logservice && ./build-docker.sh

The above will create a Docker image tagged as ratis-logservice:latest.

Launching a cluster via Compose

$ docker-compose up -d

The Compose orchestration will launch three MetadataServer containers and three Worker containers, all on the same Docker network. The -d option detaches the container logs from your current shell.

Connecting a client

$ ./client-env.sh
$ ./bin/shell <...>
$ ./bin/load-test <...>

The client-env.sh script will launch a Docker container which is on the same network as our cluster running in Compose.

Debugging the cluster

Use docker logs to inspect the output from a specific container. You must pass the name of the container (obtained via docker-compose ps or docker ps) to docker logs.

You can also “attach” to a container via docker exec to inspect the environment in which the process is running. Again, using the name of a container obtained as described above, use docker exec -it <name> /bin/sh to attach to the container.