Edit

Scaling

There are two options to scale a component:

1. Manually scale the number of replicas
2. Configure horizontal auto-scaling

Set number of replicas

To set the number of replicas, simply set the replicas parameter for a component within the devspace.yaml

deployments:
- name: my-backend
  helm:
    componentChart: true
    values:
      replicas: 4
      containers:
      ...

Instead of just running the containers defined in my-backend with one pod, the above example would run 4 pods with the specified containers. Each of these pods run isolated, i.e. altough the containers of one pod can communicate via localhost, the containers of different pods cannot.

Configure horizontal auto-scaling

To enable horizontal auto-scaling for a component, you just need to set autoScaling.horizontal.maxReplicas greater than the value replicas (see above). Additionally, you should configure one or multiple of the target value parameters, averageCPU and averageMemory. These target values define how the auto-scaler will set the number of replica to achieve an average CPU utilization and/or an average memory usage by the pods that will be scaled within this component.

deployments:
- name: my-backend
  helm:
    componentChart: true
    values:
      replicas: 4
      autoScaling:
        horizontal:
          maxReplicas: 10
          averageCPU: 800m
    ...

The above example would create an horizontal po auto-scaler which is configured to:

• create at least 4 pods for the component
• scale the component up to a maximum of 10 pods
• observe the CPU usage of the pods and try to scale between 4 and 10 pods to achieve an average CPU utilization of 800m