原本.gitlab-ci.yml

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test_backend:
  stage: test
  image: laradock/workspace:2.2-${PHP_VERSION}
  services:
    - mysql:${MYSQL_VERSION}
    - redis
  variables:
    MYSQL_ROOT_PASSWORD: "secret"
    MYSQL_DATABASE: "homestead"

執行後出現錯誤

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...

There were 2 errors:

1) ExampleTest::testIndex
Predis\Connection\ConnectionException: Connection refused [tcp://redis:tcp://172.17.0.4:6379]

/builds/IU/IUPreorder_front/vendor/predis/predis/src/Connection/AbstractConnection.php:155
/builds/IU/IUPreorder_front/vendor/predis/predis/src/Connection/StreamConnection.php:128
/builds/IU/IUPreorder_front/vendor/predis/predis/src/Connection/StreamConnection.php:178
/builds/IU/IUPreorder_front/vendor/predis/predis/src/Connection/StreamConnection.php:100
...

2) ExampleTest::testCooperation
Predis\Connection\ConnectionException: Connection refused [tcp://redis:tcp://172.17.0.4:6379]

...

可以發現錯誤主要原因是tcp://redis:tcp://172.17.0.4:6379 可是我的yml乍看之下沒什麼問題啊

解決方法

後來找到文章有人說 : 因為docker的系統環境把變量REDIS_PORT設置成了tcp://172.17.0.4:6379
所以我們須將REDIS_PORT這個變數重新再定義一次

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variables:
  REDIS_PORT: "6379"

更新並重新執行CI後就運作正常了

Reference