> ## Documentation Index
> Fetch the complete documentation index at: https://cloudanix.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Ec2 instance retirement remediation

### Triage and Remediation

<Tabs>
  <Tab title="Remediation">
    ### Remediation

    <AccordionGroup>
      <Accordion title="Using Console" defaultOpen="true">
        Here’s how to handle (remediate) AWS EC2 Scheduled Events using the AWS Management Console.

        ***

        ## 1. Find EC2 instances with scheduled events

        1. Sign in to the **AWS Management Console**.
        2. Go to **EC2**.
        3. In the left menu, select **Events** under **Instances** (or **Scheduled events**, depending on console version).
           * Or go to **Instances**, then use the filter:
             * **Status** → **Instance status** → check **With scheduled events**.

        You’ll see which instances have scheduled events, and the **event type**, **start time**, and **deadline**.

        ***

        ## 2. Understand the event type and choose action

        Typical event types and their common remediations:

        1. **Instance reboot**
        2. **System reboot**
        3. **Instance stop** (or stop/start)
        4. **Retirement** (instance or underlying host)
        5. **Maintenance** (e.g., hardware, network, or instance store impact)

        ***

        ## 3. Remediate by event type (via Console)

        ### A. Instance/System Reboot

        If the event is a reboot and your workload tolerates a short interruption:

        1. From **EC2 → Instances**, select the affected instance.
        2. Choose **Instance state → Reboot instance**.
        3. Confirm the reboot.
        4. Verify:
           * After it comes back, check application health and logs.
           * This typically clears the scheduled reboot event.

        If you cannot reboot immediately:

        * Plan a maintenance window before AWS’s scheduled time.
        * Then do the manual reboot as above.

        ***

        ### B. Instance Stop / Stop-Start

        For events specifying the instance must be stopped or stopped/started:

        1. From **EC2 → Instances**, select the instance.
        2. Ensure you can tolerate downtime and the root volume is **EBS** (not instance store).
        3. Choose **Instance state → Stop instance**.
        4. Wait for state to become **stopped**.
        5. If event calls for stop/start, then:
           * Choose **Instance state → Start instance**.
        6. Verify application and that the scheduled event is cleared.

        Note:

        * If your instance uses an **ephemeral (instance store) root volume**, data is lost on stop. Back up before stopping (AMI, snapshot, data copy).

        ***

        ### C. Instance Retirement

        If the event says the instance is scheduled for retirement:

        You must migrate or replace the instance.

        1. **Create an AMI** (if using EBS root):
           * Select the instance → **Actions → Image and templates → Create image**.
           * Name the AMI and create it.
        2. **Launch a new instance** from that AMI:
           * Go to **AMIs**, select your new AMI → **Launch instance**.
           * Use a similar instance type, same VPC, subnet, security groups, IAM role, etc.
        3. **Update dependencies**:
           * Update DNS, load balancer target groups, or other components to point to the new instance.
        4. Once traffic and data are fully migrated:
           * Stop/terminate the old instance (according to your decommissioning policy).

        You can also:

        * Change to a different instance type or AZ at this time to avoid similar hardware issues.

        ***

        ### D. Scheduled Maintenance That Requires No Action

        Sometimes events are informational only (e.g., minor network maintenance) and require no action:

        * Confirm in the event description that **no instance stop/reboot** is needed.
        * Optionally plan a maintenance window to validate application behavior during/after the window.

        ***

        ## 4. (Optional) Request reschedule of events

        For some events, AWS allows you to request a different time.

        1. In **EC2 → Events**:
           * Select the instance and scheduled event.
        2. If available, choose **Request reschedule** or similar option.
        3. Pick a new time window within the allowed range and submit.

        If the console doesn’t show a reschedule option:

        * You must complete the required action (reboot/stop/replace) before the AWS deadline.

        ***

        ## 5. Verify remediation

        After you act:

        1. Go back to **EC2 → Events**.
        2. Confirm the event is cleared or marked as **completed**.
        3. Validate:
           * Instance **Status checks** are `2/2 checks passed`.
           * Application/services are operational.

        This completes remediation of scheduled events for EC2 using the AWS console.
      </Accordion>

      <Accordion title="Using CLI">
        For EC2 “Scheduled Events” there isn’t a single magic “fix” command; remediation is to **identify affected instances using the CLI and then take the required action** (stop/start, reboot, or replace) *before* AWS performs the scheduled operation.

        Below are step‑by‑step AWS CLI instructions.

        ***

        ## 1. List EC2 instances with scheduled events

        ```bash theme={null}
        aws ec2 describe-instance-status \
          --include-all-instances \
          --query 'InstanceStatuses[?Events].{InstanceId:InstanceId,Events:Events}' \
          --output table
        ```

        You’ll see event codes like:

        * `instance-stop`
        * `instance-reboot`
        * `system-reboot`
        * `system-maintenance`
        * `instance-retirement`
        * `instance-retirement-scheduled`

        Note the `InstanceId` and event code(s) per instance.

        ***

        ## 2. Prioritize by event time

        To sort by the scheduled time:

        ```bash theme={null}
        aws ec2 describe-instance-status \
          --include-all-instances \
          --query 'InstanceStatuses[?Events].{InstanceId:InstanceId,Events:Events[*].{Code:Code,NotBefore:NotBefore}}' \
          --output json
        ```

        Focus first on events with the nearest `NotBefore` time.

        ***

        ## 3. Decide remediation action per event type

        **General rule:**\
        Do the disruptive action yourself at a controlled time instead of waiting for AWS.

        ### A. For `instance-stop` / `instance-retirement`

        1. If the instance is in an Auto Scaling Group (ASG) or behind a load balancer, ensure draining / replacement is handled.
        2. Stop and start the instance to move it to new hardware:

        ```bash theme={null}
        INSTANCE_ID=i-0123456789abcdef0

        aws ec2 stop-instances --instance-ids "$INSTANCE_ID"
        aws ec2 wait instance-stopped --instance-ids "$INSTANCE_ID"

        aws ec2 start-instances --instance-ids "$INSTANCE_ID"
        aws ec2 wait instance-running --instance-ids "$INSTANCE_ID"
        ```

        3. If you must preserve the instance exactly but hardware migration isn’t sufficient, create a replacement instance:
           ```bash theme={null}
           # Create AMI
           aws ec2 create-image \
             --instance-id "$INSTANCE_ID" \
             --name "replacement-$(date +%Y%m%d-%H%M%S)" \
             --no-reboot
           ```
           Then launch a new instance from that AMI and update DNS/ELB/Target Groups/ASGs as appropriate.

        ### B. For `instance-reboot`

        Reboot on your own schedule (often enough):

        ```bash theme={null}
        INSTANCE_ID=i-0123456789abcdef0

        aws ec2 reboot-instances --instance-ids "$INSTANCE_ID"
        ```

        Verify application health afterward.

        ### C. For `system-reboot` / `system-maintenance`

        Sometimes a simple stop/start also clears the event by moving the instance to new hardware:

        ```bash theme={null}
        INSTANCE_ID=i-0123456789abcdef0

        aws ec2 stop-instances --instance-ids "$INSTANCE_ID"
        aws ec2 wait instance-stopped --instance-ids "$INSTANCE_ID"

        aws ec2 start-instances --instance-ids "$INSTANCE_ID"
        aws ec2 wait instance-running --instance-ids "$INSTANCE_ID"
        ```

        If the event persists, you may have to accept the scheduled maintenance window or migrate workloads to a new instance and decommission the old one.

        ***

        ## 4. Confirm the event is cleared

        After you’ve taken action:

        ```bash theme={null}
        aws ec2 describe-instance-status \
          --instance-ids "$INSTANCE_ID" \
          --include-all-instances \
          --query 'InstanceStatuses[0].Events' \
          --output json
        ```

        An empty or missing `Events` array indicates the scheduled event is cleared.

        ***

        ## 5. (Optional) Script to remediate all “stop/retirement” events

        Example bash snippet to **stop/start all affected instances** (use carefully):

        ```bash theme={null}
        # Get all instance IDs with instance-stop/instance-retirement events
        INSTANCES=$(aws ec2 describe-instance-status \
          --include-all-instances \
          --query "InstanceStatuses[?Events[?Code=='instance-stop'||Code=='instance-retirement']].InstanceId" \
          --output text)

        for ID in $INSTANCES; do
          echo "Remediating $ID..."
          aws ec2 stop-instances --instance-ids "$ID"
          aws ec2 wait instance-stopped --instance-ids "$ID"
          aws ec2 start-instances --instance-ids "$ID"
          aws ec2 wait instance-running --instance-ids "$ID"
        done
        ```

        ***

        If you tell me which event code(s) you’re seeing, I can give a narrower CLI sequence tailored to that exact case.
      </Accordion>

      <Accordion title="Using Python">
        Below is a concise, step‑by‑step approach to **detect** and **remediate EC2 scheduled events** (like system reboot/retirement) using Python (boto3).

        ***

        ## 1. Understand the “misconfiguration”

        For EC2, “Scheduled Events” are AWS‑initiated actions (reboot, stop, retire instances, etc.).\
        Remediation usually means:

        * Detecting upcoming scheduled events.
        * Taking controlled action yourself **before** AWS does (e.g., stop/start, replace instance, move workload).

        ***

        ## 2. Prerequisites

        1. **Install boto3**:
           ```bash theme={null}
           pip install boto3
           ```
        2. **Configure AWS credentials/region** (e.g., using `aws configure` or environment variables).
        3. IAM role/user must have at least:
           * `ec2:DescribeInstanceStatus`
           * `ec2:StopInstances`
           * `ec2:StartInstances`
           * `ec2:RebootInstances`
           * `ec2:TerminateInstances` (only if you choose to terminate/replace)
           * `ec2:DescribeInstances`

        ***

        ## 3. Detect scheduled events via Python

        Use `describe_instance_status` with `IncludeAllInstances=True` and look at `Events` and `EventCode`.

        ```python theme={null}
        import boto3

        ec2 = boto3.client('ec2')

        def get_instances_with_scheduled_events():
            instances_with_events = []

            paginator = ec2.get_paginator('describe_instance_status')
            page_iterator = paginator.paginate(IncludeAllInstances=True)

            for page in page_iterator:
                for status in page.get('InstanceStatuses', []):
                    events = status.get('Events', [])
                    if events:
                        instances_with_events.append({
                            'InstanceId': status['InstanceId'],
                            'Events': events
                        })

            return instances_with_events

        if __name__ == "__main__":
            instances = get_instances_with_scheduled_events()
            for i in instances:
                print(i)
        ```

        Look for `EventCode` values such as:

        * `instance-reboot`
        * `system-reboot`
        * `instance-retirement`
        * `system-maintenance`
        * `instance-stop`

        ***

        ## 4. Decide remediation logic

        Typical automated actions:

        * `instance-reboot` / `system-reboot`:\
          → You may choose to **proactively reboot** during a maintenance window.
        * `instance-stop`:\
          → Stop/start the instance on your controlled schedule (note: instance-store volumes are lost).
        * `instance-retirement`:\
          → Replace the instance (create a new one from AMI/snapshot, attach EIP, update ASG, etc.).

        Below is a simple example that:

        * Detects events.
        * If `instance-stop` or `instance-retirement` is scheduled, it stops the instance (to force change under your control) and then starts it back.

        ***

        ## 5. Example remediation script (simple)

        ```python theme={null}
        import boto3
        from botocore.exceptions import ClientError

        ec2 = boto3.client('ec2')

        ACTIONABLE_EVENT_CODES = {
            'instance-stop',
            'instance-retirement',
            'system-reboot',
            'instance-reboot'
        }

        def get_instances_with_actionable_events():
            affected = []
            paginator = ec2.get_paginator('describe_instance_status')
            page_iterator = paginator.paginate(IncludeAllInstances=True)

            for page in page_iterator:
                for status in page.get('InstanceStatuses', []):
                    events = status.get('Events', [])
                    if not events:
                        continue

                    actionable_events = [
                        e for e in events if e['Code'] in ACTIONABLE_EVENT_CODES
                    ]
                    if actionable_events:
                        affected.append({
                            'InstanceId': status['InstanceId'],
                            'Events': actionable_events
                        })
            return affected

        def stop_instance(instance_id):
            print(f"Stopping instance {instance_id}")
            ec2.stop_instances(InstanceIds=[instance_id])
            waiter = ec2.get_waiter('instance_stopped')
            waiter.wait(InstanceIds=[instance_id])
            print(f"Instance {instance_id} stopped")

        def start_instance(instance_id):
            print(f"Starting instance {instance_id}")
            ec2.start_instances(InstanceIds=[instance_id])
            waiter = ec2.get_waiter('instance_running')
            waiter.wait(InstanceIds=[instance_id])
            print(f"Instance {instance_id} running")

        def remediate_instance(instance):
            instance_id = instance['InstanceId']
            events = instance['Events']

            # Simple strategy:
            # - For any actionable event: stop & start instance within your window
            # Adjust this per event type if needed.
            event_codes = {e['Code'] for e in events}
            print(f"Remediating {instance_id} for events: {event_codes}")

            # Example: for retire/stop/reboot, do controlled stop/start
            try:
                stop_instance(instance_id)
                start_instance(instance_id)
            except ClientError as e:
                print(f"Error remediating {instance_id}: {e}")

        def main():
            affected_instances = get_instances_with_actionable_events()
            if not affected_instances:
                print("No instances with actionable scheduled events.")
                return

            for instance in affected_instances:
                remediate_instance(instance)

        if __name__ == "__main__":
            main()
        ```

        ***

        ## 6. Hardening as an operational process

        * Run this script as a **scheduled job** (e.g., cron, Lambda with CloudWatch Events).
        * Optionally:
          * Filter by tags (`DescribeInstances`) so you only remediate certain workloads.
          * Integrate notifications (SNS/Slack) before/after remediation.
          * Use different logic per event type (e.g., rebuild instance for `instance-retirement`).

        If you tell me your preferred remediation behavior (e.g., “for `instance-retirement`, create a new instance from this AMI and move EIP over”), I can give a more specific Python workflow.
      </Accordion>

      <Accordion title="Using Terraform">
        ```hcl theme={null}
        # There is no Terraform argument or resource that can prevent or clear
        # AWS EC2 scheduled events; these are initiated by AWS infrastructure.

        # Terraform can only manage the instance configuration itself, e.g.:
        resource "aws_instance" "example" {
          ami           = "AMI_ID"          # replace with your AMI ID
          instance_type = "INSTANCE_TYPE"   # e.g. "t3.micro"

          tags = {
            Name = "EXAMPLE_NAME"
          }
        }
        ```

        EC2 scheduled events (instance reboot, stop, retirement, hardware maintenance) are operational actions initiated by AWS and cannot be remediated or acknowledged via Terraform; the provider exposes no argument for this.

        To remediate:

        * Use the AWS Console: EC2 → Instances → select instance → “Scheduled events” tab → follow the guidance; for stop/retire events, stop/start or replace the instance (possibly via an Auto Scaling Group or launch template managed in Terraform).
        * Or use AWS CLI: for example, stop/start or replace the instance (`aws ec2 stop-instances`, `start-instances`, or create a new instance and update any Terraform-managed references to its ID or to an Auto Scaling Group that replaces it).

        Verification with Terraform: `terraform plan` will show **no changes** related to scheduled events because they are not part of the Terraform state or schema.
      </Accordion>
    </AccordionGroup>
  </Tab>
</Tabs>