# Manual and Help

## Upgrade Postgrs to newer Version (i.e. 15 to 16)


### 1. Copy Service 

1.1 Copy whole service definition in docker-compose.yaml  
1.2 Rename old service to *-old  
1.3 Move path from new service to i.e postgres16  
1.4 Set postgres version explicit to new version

Example:
```
  databasedb-old:
    image: postgres:${POSTGRES_VERSION}
    volumes:
      - ${VOLUMES_PATH}/databasedb:/var/lib/postgresql/data
    environment:
      - POSTGRES_DB=${POSTGRES_DB}
      - POSTGRES_USER=${POSTGRES_USER}
      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}

  databasedb:
    image: postgres:16
    volumes:
      - ${VOLUMES_PATH}/databasedb16:/var/lib/postgresql/data
    environment:
      - POSTGRES_DB=${POSTGRES_DB}
      - POSTGRES_USER=${POSTGRES_USER}
      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
```

### 2. Move data
Backup data from service one to new servic with the following command: 
```
docker exec old-service pg_dumpall -U dbuser | docker exec -i new-service psql -U dbuser -d database
```

### 3. Set password
```
docker exec -i monitoring-databasedb-1 psql -U dbuser -d database -c "ALTER USER \"dbuser\" PASSWORD 'secret';"
```

### 4. Test
```docker compose up -d``` and check if service is correctly running.

### 5. Cleanup
5.1 Remove old service in docker-compose.yaml  
5.2 Set explicit version again to ${POSTGRES_VERSION} and adopt .env file  
5.4 remove old volume dir


### 6. May be move Data dir
6.1. ```docker compose down```  
6.2 ```mv /mnt/dockervolumes/databasedb16 /mnt/dockervolumes/databasedb```  
6.3 docker-compose.yaml anpassen  
6.1. ```docker compose up -d```