high_availability Block

The high_availability block is used to configure the Nomad Autoscaler agent in high availability (HA) mode. In this mode, multiple agents participate in leadership election, with only the leader conducting autoscaling calculations and actions.

high_availability {
  enabled      = true
  lock_path    = "custom/lock/path"
  lock_ttl     = "30s"
  lock_delay   = "15s"
}

high_availability Parameters

• enabled (bool: false) - Specifies whether the Nomad Autoscaler agent will start in high availability mode. If enabled, the agent instance attempts to hold a lock over a Nomad variable and will only execute if the lock is successfully acquired.

• lock_path (string: "nomad-autoscaler/lock") - Defines the path of the Nomad variable that will be used to sync the leader when running in high availability mode. This parameter needs to be the same on all Nomad Autoscaler agents expected to take part in the same leadership election process.

• lock_ttl (string: "60s") - Defines the lease period or TTL of the lock used to sync the leader when running in high availability mode. If the Nomad Autoscaler agent does not renew the lock within this period, the lock is considered lost.

• lock_delay (string: "30s") - Defines the period that the lock will be blocked after the TTL expired without being renewed. This helps prevent split brain situations.