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--- databaseandnetworkmanagement:aws_ec2_maintenance [2018/12/20 09:44] – poneill
+++ databaseandnetworkmanagement:aws_ec2_maintenance [2021/06/25 10:09] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== Managing AWS EC2 Maintenance ======
+Author: Padraig O Neill
+===== Introduction =====
+This page was created to provide a resource which documents the process involved in managing upcoming scheduled maintenance of an EC2 instance with AWS.
+This page was written post the work on ATC-996430.
+----
+===== AWS Emails =====
+When an EC2 maintenance window is approaching, we will be notified by AWS.
+The email will contain something similar to the following:
+<code>One or more of your Amazon EC2 instances is scheduled for maintenance on 2018-11-08 for 2 hours starting at 2018-11-08 00:00:00 UTC. During this time, the following instances in the us-east-1 region will be unavailable and then rebooted:
+i-0ad507630ac3439fa
+During the scheduled maintenance window, your instance will undergo a reboot. The instance will retain its IP address, DNS name, and any data on local instance-store volumes. Please note that any reboot you perform on your own will not alleviate the need for this maintenance.
+However, you can complete this maintenance at a time of your choosing by stopping and restarting your instance at any time prior to the scheduled maintenance window. Please note that the data on your local instance-store volume will not be persisted if you stop and start your instance.
+Additional information about maintenance events can be found at http://docs.amazonwebservices.com/AWSEC2/latest/UserGuide/monitoring-instances-status-check_sched.html
+We perform maintenance regularly to ensure the EC2 service runs stably and securely for our customers.
+If you have any questions or concerns, you can contact the AWS Support Team on the community forums and via AWS Premium Support at: http://aws.amazon.com/support
+</code>
+----
+===== What is required? =====
+A support ticket should be created to:
+  - Investigate the affected resource and to schedule the maintenance window for a suitable time where little/no activity is taking place on the system.
+  - To monitor this maintenance when it is taking place.
+  - To ensure all functionality is restored following the maintenance.
+----
+An example Mop is available: https://docs.google.com/document/d/1JMlcyXAWiKuG6AYINDvIsgNhAg3_p6YryKAwHDFNYrU/edit
+===== Main Process =====
+This will change depending on environment but the main approach will remain the same.
+  - Notify Customer of Maintenance
+  - Update Ansible and related Projects
+  - Comment Out Watchdogs and silence Prometheus Alerts
+  - Shutdown Applications
+  - **Stop and Start the Instance**
+  - Start-Up Applications
+  - Notify Customer Applications are available
+  - Sanity Test Applications
+  - Notify Customer Testing is finished
+  - Check that the scheduled maintenance notification is removed on AWS dashboard
+===== Things to remember =====
+  - In AWS Reboot Action != Stopping and starting of an instance.-Stopping and starting instance allows it to be moved - Rebooting does not.
+  - Dependent on Environment there may be extra actions E.g - On the load balancer we must manually restart nginx for application headers to work
+===== Useful Resources =====
+Some useful resources for RDS maintenance:
+  * [[https://aws.amazon.com/maintenance-help/|EC2 Maintenance Help page]]
+  * [[https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/monitoring-instances-status-check_sched.html|Scheduled Events for Your Instances]]

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