Testcontainer inside maven docker image in gitlab pipeline - docker

Question

I am trying to run a gitlab pipeline to run my testcases using maven image. My testcases uses testcontainer. But somehow when I am trying to run testcontainer inside maven image it's not working. I tried couple of solutions provided on different online but nothing worked.
.gillab-ci.yml
services:
- docker:dind
variables:
# Instruct Testcontainers to use the daemon of DinD.
DOCKER_HOST: "tcp://docker:2375"
# Instruct Docker not to start over TLS.
DOCKER_TLS_CERTDIR: ""
# Improve performance with overlayfs.
DOCKER_DRIVER: overlay2
test:
image: maven:3.8.2-jdk-11
stage: test
script:
- chmod -R 777 /var/
- mvn -e test -f project_folder/pom.xml
Error I am getting is :
0:58:18.653 [main] DEBUG
org.testcontainers.dockerclient.DockerClientProviderStrategy -
EnvironmentAndSystemPropertyClientProviderStrategy: failed with
exception TimeoutException (Timeout waiting for result with
exception). Root cause ConnectException (Connection refused
(Connection refused))
10:58:18.654 [main] DEBUG
org.testcontainers.dockerclient.DockerClientProviderStrategy -
UnixSocketClientProviderStrategy: failed with exception
InvalidConfigurationException (Could not find unix domain socket).
Root cause NoSuchFileException (/var/run/docker.sock)
10:58:18.655 [main] ERROR
org.testcontainers.dockerclient.DockerClientProviderStrategy - Could
not find a valid Docker environment. Please check configuration.
Attempted configurations were:
10:58:18.655 [main] ERROR
org.testcontainers.dockerclient.DockerClientProviderStrategy -
EnvironmentAndSystemPropertyClientProviderStrategy: failed with
exception TimeoutException (Timeout waiting for result with
exception). Root cause ConnectException (Connection refused
(Connection refused))
10:58:18.655 [main] ERROR
org.testcontainers.dockerclient.DockerClientProviderStrategy -
UnixSocketClientProviderStrategy: failed with exception
InvalidConfigurationException (Could not find unix domain socket).
Root cause NoSuchFileException (/var/run/docker.sock)
10:58:18.655 [main] ERROR
org.testcontainers.dockerclient.DockerClientProviderStrategy - As no
valid configuration was found, execution cannot continue
10:58:18.658 [main] ERROR ***********.***Service - Error in starting
Container : java.lang.IllegalStateException: Could not find a valid
Docker environment.

Answer 1

It seems like your service is not exposed correctly. I believe this is a TLS issue with your docker socket. Have you tried starting your DIND service explicitly disabling TLS?
variables:
DOCKER_HOST: tcp://docker:2375
DOCKER_DRIVER: overlay2
DOCKER_TLS_CERTDIR: ""
services:
- name: docker:20-dind
alias: docker
command: ["--tls=false"] # this right here