PostgreSQL Primary Key Error

Questions
1

Hi there, we have a PostgreSQL database stood up in RDS and we’re trying to connect multiple n8n instances to it using environment variables in a docker-compose format:

n8n:
image: n8nio/n8n:0.69.1-ubuntu
  ports:
    - "80:5678"
  environment:
    - N8N_BASIC_AUTH_ACTIVE=true
    - N8N_BASIC_AUTH_USER=${N8N_USER}
    - N8N_BASIC_AUTH_PASSWORD=${N8N_PASS}
    - N8N_HOST=${N8N_HOST}
    - N8N_PORT=5678
    - N8N_LISTEN_ADDRESS=0.0.0.0
    - N8N_PROTOCOL=http
    - NODE_ENV=production
    - WEBHOOK_TUNNEL_URL=http://${N8N_HOST}
    - VUE_APP_URL_BASE_API=http://${N8N_HOST}
    - DB_TYPE=postgresdb
    - DB_TABLE_PREFIX=${N8N_USER}_
    - DB_POSTGRESDB_DATABASE=n8n
    - DB_POSTGRESDB_HOST=${DB_HOST}
    - DB_POSTGRESDB_USER=${DB_USER}
    - DB_POSTGRESDB_PASSWORD=${DB_PASS}

So the first instance we start up with the following docker-compose template works great - it connects to the database, creates the tables that are needed, we can store credentials, run workflows, etc. But when we try to use the same docker-compose template to spin up another instance of n8n, we get the following error:

UnhandledPromiseRejectionWarning: Error: There was an error: relation "pk_814c3d3c36e8a27fa8edb761b0e" already exists

After some research, it looks like “pk_814c3d3c36e8a27fa8edb761b0e” is the name of the primary key constraint for the credentials_entity table. I also found this primary key referenced in this file.

Are the primary keys specific to the n8n build? Is there any way to just create a unique one upon initialization of the tables rather than build time?

Thanks!

2

Will have a look and fix this issue.

3

Did just push a fix. Will try to release the new version with the fix today or the latest tomorrow.

4

Awesome, thank you @jan! Appreciate the quick turnaround on this.

5

Got released with n8n@0.70.0

6

Sorry for the late reply but this did fix our issue! We’re able to connect multiple n8n instances to the same database now.