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# ask-ai
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Slackbot

02/20/2024, 11:03 AM
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Scout

02/20/2024, 11:03 AM
The error message you're encountering indicates that the
DAGSTER_HOME
environment variable is not set. Dagster relies on this environment variable to locate the directory where it should store instance-related data, such as run history and event logs. This directory also typically contains the
dagster.yaml
configuration file. To resolve this error, you need to set the
DAGSTER_HOME
environment variable to point to a directory on your filesystem where you want Dagster to store its instance data. Here's how you can do this for different operating systems: For Unix-like systems (e.g., Linux, macOS):
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sh export DAGSTER_HOME="/path/to/dagster_home"
For Windows using PowerShell:
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powershell $env:DAGSTER_HOME = "C:\path\to\dagster_home"
For Windows using Command Prompt:
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cmd set DAGSTER_HOME=C:\path\to\dagster_home
Make sure to replace
/path/to/dagster_home
or
C:\path\to\dagster_home
with the actual path to the directory you want to use for your Dagster instance. After setting the
DAGSTER_HOME
environment variable, you can try running the
dagster run wipe
command again, and it should work without throwing the
DagsterHomeNotSetError
. If you do not want to persist data across sessions and are okay with using a temporary directory for storage that is cleaned up when the process exits, you can use
DagsterInstance.ephemeral()
in your code to create a transient instance. However, this is typically used for temporary local development or testing.
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