Autoscaling is an easy repeatable way of spinning up fabric containers associated with the profiles . It can be particularly helpful while performing load tests and also to create the containers when new profiles are being deployed to the environment.
- Add the auto-scale profile to the root-container of the fabric (parent container ) not to the child containers.
- Command Line :
- fabric:require-profile-set command is used for defining the requirements for the instances that the profile is applied on
- fabric:require-profile-set --minimum 1 --maximum 3 some-profile-id which then tells fabric that a minimum of one instance should always be associated with the profile in the fabric environment and also that a maximum of 3 instances can be associated at any given time.
- Web-Console
- Navigate to the Profiles page on the Hawt-io screen.
- Select the profile to which you want to add the requirements.
- Click the Add-Requirements link to the right of the screen.
- Provide the minimum and Maximum number of hosts to be associated with the profile.
Issues
Once the autoscaler is defined on the root container , the requirements on the profile will be auto-provisioned by the fabric environment .
- But if for any reason the child containers are brought down , fabric will automatically create a new instance , this might prove to be a problem in case the child containers is being brought down for maintenance.
- If a container is down and is associated to a minimum requirements on a profile , the fabric will spin up a new container but will not attempt to start the shut-down container.
