Auto Maintenance - Additional Information
Maintenance Parameter Store Objects
The Lightbits STS in AWS stores the maintenance state of the instances that are in the progress of maintenance activities in the AWS Parameter Store. The tables below list the parameters and their descriptions.
ReplaceInfo
| Field | Description |
|---|---|
| instanceId | The Instance ID of the instance to be replaced. |
| forceReplace | The InstanceID of the instance to be forcefully replaced (triggers ‘upgrade’ role), for manually forcing the flow to start. |
| targetUUID | The UUID of the new server to be configured. |
| targetInstanceId | The Instance ID of the new server to be configured. |
| configureRetries | The amount of server configuration retries if the configuration fails. |
HealingInfo
| Field | Description |
|---|---|
| instanceId | The Instance ID of the instance to be healed. |
| targetUUID | The UUID of the new server to be configured. |
| targetInstanceId | The Instance ID of the new server to be configured. |
Scale-Out Information
| Field | Description |
|---|---|
| desiredClusterSize | The N the cluster is to be scaled to. |
| newServerUUID | The UUID of the new server to be configured. |
| newServerInstanceID | The Instance ID of the new server to be configured. |
Maintenance State Machine States by Role
The tables below list the various maintenance stages an instance can be in.
Healing States
| Field | Description |
|---|---|
| Idle | Set scale in protection for the entire cluster. |
| scale-out | Scaling out the cluster n+1. |
| waiting-for-target | Waiting for the target instance to become available for configuration (no action). |
| waiting-for-ssm | Waiting for the target instance to be available for SSM commands (no action). |
| configure-target | Configure the target with Ansible. |
| create-server | Create a target server (replace the node flow). |
| waiting-for-target-activation | Waiting for the target to become active (no action). |
| complete-target-activation | Target Node Active, complete lifecycle action to add an instance to NLB. |
| replace-node | Trigger node replication (source to target). |
| wait-replace-node | Waiting for node replication to complete (moving volumes to a new node). |
| disable-server | Disable the source server. |
| wait-lb-server-disabled | Waiting for the server to be disabled. |
| delete-server | Delete the source server. |
| decrease-autoscaling-group | Decrease ASG n-1 (terminates the source instance). |
| wait-for-asg-decrease | Wait for the source instance to be terminated. |
| terminate-source | Terminate Source Instance (terminating:wait would end in termination, but this is more optimized). |
| wait-for-terminate-state | Waiting for the instance to be fully terminated. |
| complete-replace | Resets scale in protection of instances if replace did not fail. |
| healing-failed | Replace failed (no action). |
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