Auto Healer

[Marieta Reeks]

TheAWS OpsWorks Stacks service reached end of life on May 26, 2024 and has been disabled for both new and existing customers. We strongly recommend customers migrate their workloads to other solutions as soon as possible. If you have questions about migration, reach out to the AWS Support Team on AWS re:Post or through AWS Premium Support.

Every instance has an AWS OpsWorks Stacks agent that communicates regularly with the service. AWS OpsWorks Stacks uses that communication to monitor instance health. If an agent does not communicate with the service for more than approximately five minutes, AWS OpsWorks Stacks considers the instance to have failed.

After the auto-healed instance is back online, AWS OpsWorks Stacks triggers a Configure lifecycle event on all of the stack's instances. The associated stack configuration and deployment attributes include the instance's public and private IP addresses. Custom Configure recipes can obtain the new IP addresses from the node object.

If you specify an Amazon EBS volume for a layer's instances, AWS OpsWorks Stacks creates a new volume and attaches it to each instance when the instance is started. If you later want to detach the volume from an instance, use the Resources page.

If the volume was not attached to the instance when the instance failed, AWS OpsWorks Stacks creates a new, empty volume with the configuration specified by the layer, and attaches that volume to the new instance.

Auto healing stops the old Amazon EC2 instance, which destroys any data that is not stored on an Amazon EBS volume. Amazon EBS volumes are reattached to the new instance, which preserves any stored data.

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Highly available apps are designed to serve clients with minimal latencyand downtime. Availability is compromised when an app crashes orfreezes. Clients of a compromised app can experience high latency ordowntime.

Autohealing lets you automatically restart apps that arecompromised. It promptly detects failed instances and recreates themautomatically, so clients can be served again. With autohealing, you nolonger need to manually bring an app back to service after a failure.

A health check sends probe requests to an instance using a specified protocol,such as HTTP(S), SSL, or TCP. For more information, seehow health checks work andhealth check categories, protocols, and ports.

The health check in this tutorial is an HTTP health check that probes the HTTPpath /health on port 80. For an HTTP health check, the probe request passesonly if the path returns an HTTP 200 (OK) response. For this tutorial, thedemo web server defines the path /health to return an HTTP 200 (OK) responsewhen healthy or an HTTP 500 (Internal Server Error) response when unhealthy.For more information, seesuccess criteria for HTTP, HTTPS, and HTTP/2.

To set up autohealing, create a custom health check and configure the networkfirewall to allow health check probes. You can use either aregional or aglobal health check. Regionalhealth checks reduce cross-region dependencies andhelp to achieve data residency. Global health checks are convenient if you wantto use the same health check for MIGs in multiple regions. In thistutorial, you create a global health check.

Pro Tip: Use separate health checks for load balancing and for autohealing. Health checks for load balancing detect unresponsive instances and direct traffic away from them. Health checks for autohealing detect and recreate failed instances, so they should be less aggressive than load balancing health checks. Using the same health check for these services would remove the distinction between unresponsive instances and failed instances, causing unnecessary latency and unavailability for your users.

For more information, see What makes a good autohealing health check.ConsoleCreate a health check.

Set Request path to /health. This indicates what HTTP path thehealth check uses. For this tutorial, the demo web server defines thepath /health to return either an HTTP 200 (OK) response whenhealthy or an HTTP 500 (Internal Server Error) response whenunhealthy.

Health checks used for autohealing should be conservative so they don'tpreemptively delete and recreate your instances. When an autohealer health checkis too aggressive, the autohealer might mistake busy instances for failedinstances and unnecessarily restart them, reducing availability.

Under the External IP column, click the IP address for anywebserver-group instance. A new tab opens in your webbrowser. If the request times out or the web page is not available,wait a minute to let the server finish setting up and try again.

This causes the web server to fail the health check. Specifically,the web server makes the /health path return an HTTP 500 (InternalServer Error). You can verify this yourself by quickly clicking theCheck health button (this stops working after the autohealer hasstarted rebooting the instance).

Wait for the status of the web server instance to change. The greencheckmark next to the instance name should change to a grey square,indicating that the autohealer has started rebooting the unhealthyinstance.

This causes the web server to fail the health check. Specifically,the web server makes the /health path return an HTTP 500 INTERNALSERVER ERROR. You can verify this yourself by quickly making a requestto /health (this stops working after the autohealer hasstarted rebooting the instance).

Can you update the health check configuration to heal instances as fast as possible? (In practice, you should set the health check parameters to use conservative values as explained in this tutorial. Otherwise, you may risk instances being mistakenly deleted and restarted when there is no real problem.)

After you finish the tutorial, you can clean up the resources that you created so that they stop using quota and incurring charges. The following sections describe how to delete or turn off these resources.

If you created a separate project for this tutorial, delete the entire project.Otherwise, if the project has resources that you want to keep, only delete thespecific resources created in this tutorial.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

I'm trying to make a auto healer for a game called Kal Online. Its a free MMORPG. Anyway for some reason auto it cant detect colors in D3D. At least in this game. Is there anyway to get it to see the color? Making it printscreen and than having autoit reading off of the print screen? Or some other more simpler way to do this? Heres the code I got so far.

Direct X is a engine to use to make coding a game easyer. It has functions in it so the game programmer doesnt have to make functions for everything. Theres also OpenGL which is used to draw stuff as well. Direct X is made by Microsoft and OpenGL is open source(i think). Mac OS X and up, and linux use opengl to draw its GUI.

If anyone has a way/idea to pull colors from Direct X games PLEASE reply. I also set the code up like that because I plan on expanding on it and making a full bot. So instead of writing 50 waits(for pixel scanning and stuff like that) mine as well do it once or twice.

Theres server maintence going on right now so you wont beable to play for 1 hour and 7 minutes. But in the mean time you can download the client. If you have any problems updating the client(which I bet you will) post back and Ill tell you how to get it to work.

EDITED: Theres a program kinda like AutoIt but its called AC Tool. AC Tool works for kal online. So it is possible to grab the pixals from kal. Just need to figure out a way. And I dont think I can since I'm not quite that advance. I refuse to use AC Tool though since its no where near as advance and as flexible as AutoIt.

The packets are written in korean and finding memory values for this game are extremely hard. Like the memory is encrypted untel the last second of when its used. If I search for current health values non show up. But I can find the total health value and useless stuff like that.

Kubernetes is self-healing container orchestration platform that can detect failures from pods and redeploy those workloads, but magnum-auto-healer is a self-healing cluster management service that will automatically recover a failed master or worker node within your Magnum cluster.

We recommend running magnum-auto-healer service as a DaemonSet on the master nodes, the service is running in active-passive mode using leader election mechanism. There is a sample manifest file here, you need to change some variables as needed before actually running kubectl apply command.

The following commands are just examples:

You can ssh into a worker node (lingxian-por-test-1-12-7-ha-bbgjts5g4xhb-minion-1 in this example) and stop the kubelet service to simulate the worker node failure. The node status check is implemented in NodeCondition health check plugin (see configuration above).

Currently, the magnum-auto-healer is still in the prototype phase, meaning many breaking changes can get accepted over time. Catalyst Cloud will deploy the service in production but as an alpha feature. Any feedback or contributions are welcome.

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