Configure cache on GitLab runner

Question

I don't manage to configure a cache directory, but somehow it does not work. I'm not even sure it takes the config.toml file.

my config.toml:

concurrent = 1
check_interval = 0

[session_server]
  session_timeout = 1800

[[runners]]
  cache_dir = /tmp/gitlab-runner-cache

... both on /etc/gitlab-runner/config.toml and in ~/.gitlab-runner/config.toml

my .gitlab-ci.yml:

image: docker:latest
services:
  - docker:dind

cache:
  key: "myCache"
  paths:
    - ${CI_PROJECT_DIR]/.m2/

variables:
  DOCKER_DRIVER: overlay
  MAVEN_OPTS: -Dmaven.repo.local=${CI_PROJECT_DIR}/.m2

stages:
  - build
  - acceptance

maven-build:
  image: maven:3.3-jdk-8
  stage: build
  script: "mvn clean package"
  artifacts:
    paths:
      - target/*.jar

maven-acceptance:
  dependencies:
    - maven-build
  image: maven:3.3-jdk-8
  stage: acceptance
  script: "mvn verify"

When I try: gitlab-runner exec shell maven-build

I get the error:

ERROR: Could not create cache adapter               error=cache factory not found: factory for cache adapter "" was not registered

The build is successful, but the .m2 repository is not cached...

Therefore, I have 2 questions:

1. How to know if gitlab-runner actually takes my config.yml?
2. What is a correct config for caching?

Thanks in advance!

Answer 1

I ran into the same issue just now. I am not sure which version of Gitlab you use, but version 12 supports either an S3-compatible storage or GCS as the cache provider (see thes docs), but no local cache folder like cache_dir = /tmp/gitlab-runner-cache.

The issue I had was, that I forgot to add Type = "s3" to the [runners.cache]section of the Runner configuration:

  [runners.cache]
    Type = "s3"
    Shared = true
    [runners.cache.s3]
      ServerAddress = ...