Getting dial tcp [::1]:32768: connect: connection refused from gitlab ci

[glossd]

Locally it's all working, but when I run it in gitlab ci I get this error dial tcp [::1]:32768: connect: connection refused

In CI I configured DOCKER_HOST variable pointing to tcp://docker:2375

dockertest.NewPool("") should connect to docker daemon.

[aeneasr]

Which version of dockertest are you using? Are you sure tcp://docker:2375 is the URL where docker is running? You can confirm that by SSHing into the CI container.

[glossd]

dockertest version is v3.3.5 . I can assure you docker daemon is available on that url. I've run tests with java testcontainers library and everything was all right. But golang testcontainers showed the same error(((

[aeneasr]

That sounds like a misconfiguration then, CircleCI and TravisCI work fine. I don't think I can help you here.

[carlows]

@aeneasr I'm getting this same error but looks to be raised when trying to connect to the container.

I'm trying a simple setup with docker and postgres:

docker build -t container .
docker network create --driver bridge test_network
docker run --network=test_network container go test ./...

results in: dial tcp: lookup docker on 127.0.0.11:53: no such host

The code:

pool, _ := dockertest.NewPool("")

resource, _ := pool.Run("postgres", "13-alpine", []string{"POSTGRES_PASSWORD=secret", "POSTGRES_DB=" + databaseName})

pgURL := fmt.Sprintf("postgres://postgres:secret@localhost:%s/%s?sslmode=disable", resource.GetPort("5432/tcp"), databaseName)

err = pool.Retry(func() error {
        var err error
        db, err = gorm.Open("postgres", pgURL)
	if err != nil {
		return err
	}
	return db.DB().Ping()
})

What is missing for this to work?

[aeneasr]

I don't use GitLab so I don't know, sorry!

[carlows]

@aeneasr what I mentioned was not related to GitLab 😛 it is just a docker image I'm running locally.

[aeneasr]

This issue is about GitLab, if you have another problem please use a separate issue, thank you!

[glossd]

It took some time to figure it out)
In the examples the pool.Retry tries to connect to localhost whereas gitlab service runs docker:dind image (with container name docker) along side with the golang container where all the scripts get executed.
The database container runs inside that docker:dind container which means if I wish to connect to db container I should specify docker as a db host, not localhost

[glossd]

Example gitlab-ci.yml

go-test:
  stage: test
  image: golang:1.15
  services:
    - docker:dind
  variables:
    DOCKER_HOST: tcp://docker:2375
    DOCKER_DRIVER: overlay2
    DB_HOST_OF_YOUR_APP: docker
  script:
    - go test ./...

• You need to have DB_HOST_OF_YOUR_APP environment variable setting your database host.

[aeneasr]

Could you maybe add this to the readme so others can find this information quickly? :)

[glossd]

@aeneasr In order to make it work in gitlab ci the retry database host in the examples should be docker host, not localhost. Do you think it's worth to change the examples for the sake of gitlab ci or just put the note about it in readme?
Additionally the application's database host must be configurable through environment variables.
Should I add this note to the root readme?