09.11 lesson-4.md

lesson-4.md update executors and runners how to get specific tool and version in a docker container

Author: JavaScriptonit

.gitlab-ci.yml

@@ -1,3 +1,5 @@
+image: node:17-alpine
+
 workflow:
  rules:
  - if: $CI_COMMIT_BRANCH != "main" && $CI_PIPELINE_SOURCE != "merge_request_event"
@@ -19,6 +21,7 @@ run_unit_tests:
  - echo "Preparing test data..."
  script:
  - echo "Running unit tests for $MICRO_SERVICE_NAME ..."
+ - npm version
  after_script:
  - echo "Cleaning up temporary files..."
 

Course/lesson-4.md

@@ -4,7 +4,7 @@
 1. GitLab Server (GitLab Instance/ GitLab Installation) - is the main component of GitLab architecture
 2. GitLab Runners execute the jobs
 3. Gitlab.com - server to run the jobs with Runners
-4. Different executor types :
+4. **Different executor types :**
  1. Shell executor
  2. Docker executor
  3. Virtual machine executor
@@ -14,4 +14,22 @@
  7. Parallels executor
  8. VirtualBox executor
 5. To make multiple executors on the same host or the same server - register multiple runners on the same host\
-To have 10 runners on 1 machine with its own executor - [GitLab Executors](https://techworld-with-nana.teachable.com/courses/1769488/lectures/39894185)
+To have 10 runners on 1 machine with its own executor - [GitLab Executors](https://techworld-with-nana.teachable.com/courses/1769488/lectures/39894185)
+6. **Execution Flow:**
+ 1. **GitLab -> Runner -> Executor**
+ 1. Runner requests new jobs from GitLab instance (GitLab.com)
+ 2. Runner compiles and sends the job's payload to Executor
+ 3. Executor clones sources or downloads artifacts from GitLab instance and executes the job
+ 4. Executor returns jobs output abd status to the Runner
+ 5. Runner updates job output and status to GitLab instance
+7. **Default Shared Runners:**
+ 1. By default, GitLab uses one of its shared runners to run your CI/CD jobs
+ 2. These shared runners are maintained by GitLab
+ 3. Docker Machine Executors are used for them
+ 1. `Preparing the "docker+machine" executor` - in Job logs: type, name of executor
+8. **Scope of Runners:**
+ 1. Shared Runners - available to all groups and projects in a GitLab instance
+ 2. Group Runners - available to all projects in a group
+ 3. Specific Runners - associated with a specific project
+9. **Specify a Docker image that the jobs runs in:**
+ 1. "image"