834-Adding-pg_cron-to-Postgres-Docker-Image #842

Merged

a22erigr merged 3 commits from 834-Adding-pg_cron-to-Postgres-Docker-Image into team_2_week_5

2026-05-08 11:15:25 +00:00

a24vinla commented

2026-05-08 09:51:06 +00:00

Collaborator

What's been done

Done on Windows 11
Added pg_cron to our postgres image. Uses citusdata's pg_cron git. Citusdata is the industry standard, and has been acquired by Microsoft. If we ever switch of using an Alpine image, this could be changed to not require its own Dockerfile.

/DockerCompose/postgres_dockerfile/Dockerfile
- Created folder and new Dockerfile for our postgres image. Since we use an alpine build we have to create our custom postgres Dockerfile, since alpine uses APK instead of apt. All it does differently is that it adds the pg_cron extension to the shared libraries, meaning our sensors database can create it on startup.
/DockerCompose/compose.yaml
- Postgres will now build the new dockerfile (above)
/DockerCompose/init_sql/01-sensors.sql
- Now creates pg_cron extension (if it doesn't already exist)
/DockerCompose/init_sql/ 03-sensors-cron-jobs.sql
- Created sql file that will house our scheduled cron jobs

How to check if it works

IMPORTANT
Make sure that you delete existing postgres image and volumes

Rebuild all images (expect postgres build time to be longer than usual)
Enter postgres container (either in docker desktop or enter using docker exec command in terminal)
Enter sensors database using psql -U "database username" -d sensors (username found in .env)
Run the following command: SELECT * FROM pg_extension WHERE extname = 'pg_cron';
4.1. You should see one row containing pg_cron
Run the following command: SELECT schema_name FROM information_schema.schemata WHERE schema_name = 'cron';
5.1. You should see cron
If above commands gave the expected outputs, pg_cron is working correctly
If not, please post outputs in review, as well as checking postgres container logs

I had some problems with the volumes, so if you have the time, prune docker. It should work with just removing volumes using docker compose down -v.

## What's been done Done on Windows 11 Added pg_cron to our postgres image. Uses citusdata's pg_cron git. Citusdata is the industry standard, and has been acquired by Microsoft. If we ever switch of using an Alpine image, this could be changed to not require its own Dockerfile. + /DockerCompose/postgres_dockerfile/Dockerfile + Created folder and new Dockerfile for our postgres image. Since we use an alpine build we have to create our custom postgres Dockerfile, since alpine uses APK instead of apt. All it does differently is that it adds the pg_cron extension to the shared libraries, meaning our sensors database can create it on startup. + /DockerCompose/compose.yaml + Postgres will now build the new dockerfile (above) + /DockerCompose/init_sql/01-sensors.sql + Now creates pg_cron extension (if it doesn't already exist) + /DockerCompose/init_sql/ 03-sensors-cron-jobs.sql + Created sql file that will house our scheduled cron jobs ## How to check if it works **IMPORTANT** Make sure that you delete existing postgres image and volumes 1. Rebuild all images (expect postgres build time to be longer than usual) 2. Enter postgres container (either in docker desktop or enter using docker exec command in terminal) 3. Enter sensors database using psql -U "database username" -d sensors (username found in .env) 4. Run the following command: SELECT * FROM pg_extension WHERE extname = 'pg_cron'; 4.1. You should see one row containing pg_cron 5. Run the following command: SELECT schema_name FROM information_schema.schemata WHERE schema_name = 'cron'; 5.1. You should see cron 6. If above commands gave the expected outputs, pg_cron is working correctly 7. If not, please post outputs in review, as well as checking postgres container logs I had some problems with the volumes, so if you have the time, prune docker. It should work with just removing volumes using docker compose down -v.

a24vinla added the

needs review

label

2026-05-08 09:51:06 +00:00

a24vinla added 2 commits

2026-05-08 09:51:06 +00:00

Added a custom dockerfile to build postgres image with pg_cron e2ed4f9dba

Added cron extension to sensors and created cron jobs sql file b361803b26

a24vinla added 1 commit

2026-05-08 09:52:11 +00:00

Changed file names to follow same structure 2f78ca8906

j21marbr commented

2026-05-08 10:59:55 +00:00

Collaborator

Review on #842

Whats done

Tested on macOS

Rebuilt the containers with the new docker image
Verified that postgres container starts correctly
Verified that pg_cron extension exists in the sensors database
Verified that the cron schema is created correctly

Inspected following files

compose.yaml
- Indentation/code styling
  - Follows standard
- Naming convention
  - Follows standard
- General code quality
  - No issues found
DockerCompose/postgres_dockerfile/Dockerfile
- Indentation/code styling
  + Follows standard
  - Naming convention
    - Follows standard
  - Comments
    - Looks good
  - General code quality
    - pg_cron is installed and configured correctly
DockerCompose/init_sql/01-sensors.sql
- Indentation/code styling
  + Follows standard
  - Naming convention
    - Follows standard
  - General code quality
    - Creates pg_cron extension correctly if it does not already exist
DockerCompose/init_sql/03-sensors_cron_jobs.sql
- Indentation/code styling
  + Follows standard
  - Naming convention
    - Follows standard
  - General code quality
    - No issues found

What needs to be done

No issues found

Conclusion

Works as intended and the code is ready to be merged.

# Review on #842 ## Whats done ### Tested on macOS + Rebuilt the containers with the new docker image + Verified that postgres container starts correctly + Verified that pg_cron extension exists in the sensors database + Verified that the cron schema is created correctly ### Inspected following files + compose.yaml + Indentation/code styling + Follows standard + Naming convention + Follows standard + General code quality + No issues found + DockerCompose/postgres_dockerfile/Dockerfile + Indentation/code styling + Follows standard + Naming convention + Follows standard + Comments + Looks good + General code quality + pg_cron is installed and configured correctly + DockerCompose/init_sql/01-sensors.sql + Indentation/code styling + Follows standard + Naming convention + Follows standard + General code quality + Creates pg_cron extension correctly if it does not already exist + DockerCompose/init_sql/03-sensors_cron_jobs.sql + Indentation/code styling + Follows standard + Naming convention + Follows standard + General code quality + No issues found ## What needs to be done + No issues found ## Conclusion + Works as intended and the code is ready to be merged.

j21marbr commented

2026-05-08 11:04:56 +00:00

Collaborator

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