![]() ![]() If so, skip the shutdown step.Updated Oct. For example, the script could check if a particular tag has been added to the instance. I suggest you add a circuit breaker in the code so you can tell the code not to shutdown. Then, if you start the instance again, it will once again fail and shutdown. If something goes wrong with the batch script, it might shutdown the instance before you can login and debug the situation. The default is Stop, which means the instance will be turned off, but can turn on again afterwards. It can be set to either Stop or Terminate. ![]() Shutting down the instance from the operating system takes advantage of the Shutdown Behavior parameter that tells EC2 what to do when the operating system shuts down the computer. If you don't include it, then the operating system turns off but the virtual computer keeps running.) (The -h means 'halt', which tells the virtual hardware to turn itself off. However, an easier way is to simply issue the operating system shutdown command: Yes, you could call the StopInstances() command, passing the instance ID. Once your batch job has completed, what's the easiest way to shutdown the instance? Please note that User Data can only be updated when an instance is in the Stopped state.) (For example, you could pass an S3 filename through User Data and the script could download and process the file. The script could then retrieve information to be processed from a database, Amazon SQS queue or even the instance User Data. This is a great way to trigger a batch process on the instance. So, if you're going to use an Amazon EC2 Linux instance to run a batch job on startup, simply install the script in this directory:Įach time the instance is booted (started), the script will run. what if you want to run a script every time the instance starts? Fortunately, Cloud-Init can also run scripts: (Or, to be more accurate, once per Instance ID.) This makes it great for installing software and configuring systems, since it only runs once.īut. It is supported across all major public cloud providers, provisioning systems for private cloud infrastructure, and bare-metal installations.Ī script passed through User Data is executed the first time an instance is booted. They still maintain it today:Ĭloud-init is the industry standard multi-distribution method for cross-platform cloud instance initialization. It was Canonical that came up with that concept and created Cloud-Init. User Data was simply there to pass some information that was then accessible to applications running on the instance (eg "Here's the password for the database"). AWS didn't come up with the idea of passing a script to the instance. Running Commands on Your Windows Instance at Launch.Running Commands on Your Linux Instance at Launch.Most people know about the ability to pass a script via User Data that will executed when an EC2 instance is first booted. Here's some tips on how to use Amazon EC2 instances for batch work including running scripts at startup and shutting down when finished. ![]() Packages can only be up to 250MB (unzipped)įor situations that don't fit these limitations, there's always Amazon EC2! (Containers with Fargate are another option.).They only have 512MB of temporary disk space.Lambda functions run for a maximum of 15 minutes.Sorry serverless folks, but AWS Lambda isn't the answer to every problem! ![]()
0 Comments
Leave a Reply. |