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<@ULVA73B9P> Using Prefect 3, how can I define common attributes for my deployments one, so I don’t ...
# ask-marvin
t
@Marvin Using Prefect 3, how can I define common attributes for my deployments one, so I don’t have to repeat them for each defined deployment section?
m
In Prefect 3, you can define common attributes for your deployments to avoid repetition using YAML aliasing in your 
prefect.yaml
file. This technique allows you to reuse parts of configurations like work pool, schedule, and build configuration across multiple deployments. Here's how you can do it: 1. Definitions Section: You can add a 
definitions
section in your 
prefect.yaml
file to store aliases. This is done at the same level as the 
deployments
section. 2. YAML Aliases: Use YAML alias syntax to reference these common configurations. By using 
*{alias_name}
to alias elsewhere and 
<<: *{alias_name}
to inherit and override specific fields, you can effectively share configurations among deployments. For example:
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yaml
definitions:
  work_pool_config: &work_pool
    some_common_setting: value
  schedule_config: &schedule
    cron: "0 0 * * *"

deployments:
  deployment-1:
    <<: *work_pool
    <<: *schedule
    # Additional or overridden settings specific to deployment-1

  deployment-2:
    <<: *work_pool
    # Overrides a field specifically for deployment-2
    dockerfile: custom.Dockerfile
In this setup, 
deployment-1
and 
deployment-2
share the same work pool configuration, while 
deployment-1
and 
deployment-3
might share the same schedule configuration. This allows for reduced repetition and streamlined configuration management. For more details, you can check the Prefect documentation here.
t
@Marvin What would be the syntax for defining a common set of tags that all deployments would use?
m
To define a common set of tags for all deployments in Prefect 3, you can use YAML aliasing, much like with other shared configurations. This way, you don't have to repeat the tags for each deployment. Here's how you can do it: 1. Define Tags in 
definitions
Section: Add the common set of tags under a 
definitions
section in your 
prefect.yaml
file. 2. Reference the Tags in Deployments: Use the aliasing syntax to include these tags in each deployment. Here's an example:
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yaml
definitions:
  common_tags: &common_tags
    - tag1
    - tag2
    - tag3

deployments:
  deployment-1:
    tags: *common_tags
    # Other configurations specific to deployment-1

  deployment-2:
    tags: *common_tags
    # Other configurations specific to deployment-2

  deployment-3:
    tags:
      - <<: *common_tags
      - additional_specific_tag
    # Other configurations specific to deployment-3
In this setup, 
deployment-1
and 
deployment-2
will have the same set of tags defined in 
common_tags
. 
deployment-3
will have the common tags plus an additional specific tag. For more about configuring deployments with Prefect, you can check their documentation here.
t
@Marvin Could I set a value for the ‘path’ in the deployment somewhere that would be used by default for all deployments?
m
Yes, you can set a default path that will be used by all your Prefect deployments by leveraging YAML aliasing, similar to how you define common tags or other configurations. 1. Define the Default Path: In the 
definitions
section of your 
prefect.yaml
, set the path you want as the default. 2. Reference the Default Path: Use the aliasing functionality to include this path in each deployment. Here's how you might structure it:
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yaml
definitions:
  default_path: &default_path "/your/default/path"

deployments:
  deployment-1:
    path: *default_path
    # Other configurations specific to deployment-1

  deployment-2:
    path: *default_path
    # Other configurations specific to deployment-2

  deployment-3:
    path: *default_path
    # With possible adjustment specific to this deployment
    special_setting: true
In this setup, each deployment will inherit the default path, reducing redundancy and promoting consistency across deployments. If a specific deployment needs a different path, you can override it in that deployment's section. For more information on managing deployments in Prefect, you can refer to their documentation.
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