tauffredou / microservice-course

microservice-course

We will create an API server used to do full text search, via Elasticsearch, in sport facilities list in Paris deployed with docker and docker-compose.

Step 1

Create a Dockerfile to deploy the Golang application in main.go. It is recommended to use the official golang:1.12 image.

When you start the application with the following command:

docker run -it --rm <your image name>

The application should panic with the following error:

panic: health check timeout: Head http://127.0.0.1:9200: dial tcp 127.0.0.1:9200: connect: connection refused: no Elasticsearch node available

goroutine 1 [running]:
main.main()
	/usr/src/main.go:76 +0xdc2

At this point, try to identify why the application is returning an error and what should we do avoid it.

Useful documentation:

• Dockerfile reference

Step 2

Use docker-compose to run an Elasticsearch cluster besides the application.

NOTE: the Elasticsearch cluster can't start without the env var dicovery.type=single-node.

At this point, the application should start and load data into the Elasticsearch cluster if necessary. You can reset the Elasticsearch index with the following command:

curl -XDELETE http://<hostname of the elasticsearch container>:9200/_all

After starting (it could take multiple seconds the first time), the service should be available and you can test it with the following command:

curl http://<hostname of the application container>:<port exposed>/search?q=Paris

Useful documentation:

• Compose reference
• Elasticsearch documentation on Docker

Petclinic features https://docs.google.com/document/d/1V28rAQzsKc9_5XF5kljyKiOLF0OjbbeBwZY3qXyIwNw