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Title
# ask-ai
b

Binoy Shah

02/20/2024, 2:33 PM
@Scout how do I connect and store Dagster run data in Postgres, instead of SQLite using single environment variable
s

Scout

02/20/2024, 2:33 PM
To configure your Dagster instance to use PostgreSQL for run storage with a single environment variable, you can set up your
dagster.yaml
file to use an environment variable for the PostgreSQL connection string. Here's how you can do it based on the documentation: 1. Install the
dagster-postgres
library if you haven't already, as it's required to use PostgreSQL storage with Dagster. 2. Define the PostgreSQL connection string as an environment variable in your environment. For example, you might set an environment variable like this in your shell:
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sh    export PG_DB_CONN_STRING="<postgresql://username:password@hostname:port/dbname>"
3. In your
dagster.yaml
file, configure the
storage
section to use the environment variable for the PostgreSQL connection string. Here's an example configuration:
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yaml    storage:      postgres:        postgres_url:          env: PG_DB_CONN_STRING
With this configuration, Dagster will use the connection string provided by the
PG_DB_CONN_STRING
environment variable to connect to your PostgreSQL database for storing run data. Make sure to replace
username
,
password
,
hostname
,
port
, and
dbname
with your actual PostgreSQL credentials and database information in the environment variable. Remember to restart your Dagster instance after making changes to the
dagster.yaml
file for the new configuration to take effect.
b

Binoy Shah

02/20/2024, 2:33 PM
@Scout what does the
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PG_DB_CONN_STRING
look like ?
s

Scout

02/20/2024, 2:34 PM
The
PG_DB_CONN_STRING
is an environment variable that holds the PostgreSQL database connection string. A PostgreSQL connection string is a URI that contains the information needed to connect to a PostgreSQL database. It typically includes the username, password, hostname, port, and database name. Here is an example of what a PostgreSQL connection string might look like:
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<postgresql://username:password@hostname:port/dbname>
- `username`: Your database username. - `password`: Your database password. - `hostname`: The hostname where your PostgreSQL server is running. This could be an IP address or a domain name. - `port`: The port number on which your PostgreSQL server is listening. The default PostgreSQL port is
5432
. - `dbname`: The name of the database you want to connect to. In a real-world scenario, you would replace
username
,
password
,
hostname
,
port
, and
dbname
with your actual database credentials and connection details. For example, if your PostgreSQL database has the following details: - Username:
myuser
- Password:
mypassword
- Hostname:
<http://mydb.example.com|mydb.example.com>
- Port:
5432
- Database Name:
mydatabase
Then your connection string would look like this:
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<postgresql://myuser:mypassword@mydb.example.com:5432/mydatabase>
You would then set the
PG_DB_CONN_STRING
environment variable to this connection string before running your Dagster instance.
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