# Manual and Help

## Upgrade Postgrs to newer Version (i.e. 15 to 16)
[Source](https://helgeklein.com/blog/upgrading-postgresql-in-docker-container/)

### 1. Stopp application conatiner
```
docker compose down APP_CONTAINER_NAME
```


### 2. Create a Full DB Dump
Look up the name of your PostgreSQL user in your Docker configuration. Sometimes postgres or something

```
docker exec -it POSTGRESQL_CONTAINER_NAME pg_dumpall -U postgres > dump.sql
```

### 3. Stop the PostgreSQL Container
```
docker stop POSTGRESQL_CONTAINER_NAME # with compose
docker compose stop POSTGRESQL_SERVICE_NAME # with compose
docker compose down # all
```

### 4. Move the DB Data Directory
Use root priveleges to move data dir. Backup old one.
```
mv db/ db-old/
mkdir db
```

### 5. Increment the PostgreSQL Version
Edit the Docker compose file, incrementing the image version.  
If image is set with postgres:${POSTGRES_VERSION} change .env file.


### 6. Start container with empty data directory
Start container and Verify logs
```
docker compose up -d POSTGRESQL_CONTAINER_NAME
docker compose logs -f
```


### 7. Import DB Dump
Backup data from service one to new servic with the following command
Use this:
```
docker compose exec -T POSTGRESQL_SERVICE_NAME psql -U POSTGRES_USER POSTGRES_DB < dump.sql
```

### 8. set password
```
docker exec -i POSTGRESQL_CONTAINER_NAME psql -U POSTGRES_USER -d database -c "ALTER USER \"POSTGRES_USER\" PASSWORD 'POSTGRES_PASSWORD';"
```

### 8. Start the Application Container
```
docker compose up -d APP_CONTAINER_NAME
```

### 9. Test
Check if service is working correctly.  
Check logs:
```
docker compose logs -f
``` 

### 10. Clean Up
* Delete the backup directory: rm -rf db-old/
* Delete the dump file: rm dump.sql
* Delete the old PostgreSQL image: docker image prune -a