ec2 user data script not running

What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? If you use HTTPS, this is not going to work and its going to give you an infinite loading screen. These instructions are intended for I want to get an output (success or failure) back from EC2 and based on the result start an appropriate step function. EC2 User Data scripts run with a root user. Open the Amazon EC2 console, and then select your instance. Where does this (supposedly) Gibson quote come from? On Windows, you can use the AWS Tools for Windows PowerShell instead of using the AWS CLI. For this, well be launching our EC2 instance which is, well, a virtual server and well use the console for this then we will launch a web server directly on the EC2 instance using a piece of code as user data script and we will pass to the EC2 instance. In this article, we are going to have a T2 micro selected. Subscribe to our newsletter below to get awesome AWS learning materials delivered straight to your inbox. However, you can use the But, the very last bash command in the script is supposed to start a python script which will run (indefinitely/ or . rev2023.3.3.43278. Supported browsers are Chrome, Firefox, Edge, and Safari. Asking for help, clarification, or responding to other answers. You should allow a few EC2 User Data scripts will not run any commands as non-root user powershell user data script run on restart of the Windows instance rev2023.3.3.43278. and look for error messages in the output. Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? Run commands on your Linux instance at launch, Run commands on your Windows instance at launch. following tasks are performed by the user data: The distribution software packages are updated. The first security group created will be called launch-wizard-1 which is created by the console directly and we can define multiple rules here. How can I do that? information, see Create a security group. Is there any way to find user-data execution logs for mac-ec2 similar to what we have for linux-ec2 (/var/log/cloud-init.log)? document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); Get awesome AWS learning material delivered straight to your inbox. How to Execute EC2 User Data Script using CloudFormation Refresh the page, check Medium 's site. @c24w Those timestamps are misleading. To learn more, see our tips on writing great answers. Topological invariance of rational Pontrjagin classes for non-compact spaces, Finite abelian groups with fewer automorphisms than a subgroup. Making statements based on opinion; back them up with references or personal experience. Ref: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/user-data.html#user-data-shell-scripts. How much random access memory or RAM do you want? You can modify the user data of a stopped instance using the modify-instance-attribute Lets go to view all instances and refresh the page its gonna take about 10, 15 seconds for the instance to come up and this is the whole power of the Cloud we are able to create an instance or 100 of them very quickly in less than 10 seconds without us owning any single server. Please help us improve AWS. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Adding these tasks at boot time UPDATE: I removed the sudo su and added an echo command for debugging. For more Before you can use this file with the AWS CLI, you must remove the first (BEGIN CERTIFICATE) and last Once the instance name is created we can observe a few things. amazon ec2 - user data scripts not working for me during starting of All rights reserved. With describe-instance-attribute, the AWS CLI does not perform base64 decoding of the user data for you. If you've got a moment, please tell us what we did right so we can do more of it. The below script worked perfectly for me after the ubuntu ec2 instance was launched. The script is not deleted after it is run. about viewing user data from your instance using instance metadata, see Retrieve instance user My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? User data is a feature that allows customization of Amazon EC2 (virtual machine) when it is created and (if desired) also with each restart after they are provisioned. To troubleshoot issues on your EC2 instance bootstrap without having to access the instance through SSH, you can add code to your user-data bash script that redirects all the output both to the /var/log/user-data.log and to /dev/console.When the code is run, you can see your user-data invocation logs in your console. The cloud-init user directives can be passed to an instance at launch the same way that a Make sure that the latest version of cloud-init is installed and functioning properly on your EC2 instance. And in the Cloud, you can start and stop instances just as you wish. On a Linux computer , use the --query option to get the encoded user data and the For windows, it can be done by checking a box in Ec2 Services Properties. So, that EC2 User data script is only run once and when it first starts, and then will never be run again. For more information, see Add rules to a security group. If any one of those conditions is not met, your user data scrip will fail, since it need connection to the Internet (in your case). Required fields are marked *. I checked the system logs and saw my echoed string. communities including Stack Overflow, the largest, most trusted online community for developers learn, share their knowledge, and build their careers. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. You also need to allow the same on outbound NACL's rules and ephemeral ports on inbound rules. How to make EC2 user data script run again on startup? check that the security group you are using contains a rule to allow HTTP (port 80) traffic. Choose Actions, Instance Settings, Edit User Data. just add --// at the end of your user data script , example : User Data should execute fine without using #cloud-boothook (which is used to activate the User Data at the earliest possible time during the boot process). traffic so that you can connect to the instance to view the output log files. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. Does a barbarian benefit from the fast movement ability while wearing medium armor? User_data is run only at the first start up. Use the --attribute and --value parameters to use the encoded text file Note that the encoded output is stored in a file and the decoded output Bootstrap script to configure the instance at first launch, which is called the EC2 User Data. Thanks for contributing an answer to Stack Overflow! to the instance, examine the output log file Windows EC2 PowerShell user data script to create a local RDP This is how I got it to work: I moved to pulling it from a template instead since what you see is what you get. At least that's how it is in Linux, I guess on Windows it would be similar. Modify the user data as needed, and then choose Save. Connect and share knowledge within a single location that is structured and easy to search. but they used for linux based Ec2 instance. Why don't you echo out some progress information in your userdata script, step by step, and then check the console output afterwards? You can update your configuration to ensure that your user data scripts and cloud-init directives run every time you restart your instance. Remember that any files you So, if you want your new AMI to execute user-data again, just create the flag again before create the image: The only way I get it to work was to add the #cloud-boothook before the #!/bin/bash, This is a typical user data script that installs Apache web server on a newly created instance. Allow enough time for the instance to launch and run the directives in For more information about For more information, see The permissions you Change parameters like ImageId, InstanceType and KeyName with your own AMI Id, instance type and name of keypair respectivey. Next, we need to choose an instance type. What video game is Charlie playing in Poker Face S01E07? Continue to add echo before each command and confirm how far it's running, This was a lifesaver for me - thanks. The httpd service is started and turned on via assign to the IAM role depend on which services you are calling with the API. User data formats# User data that will be acted upon by cloud-init must be in one of the following types. The bash shell script creates a file If you wanted to compare the instance types click on Compare Instance types it shows you all the types of instances as well as how much memory they have and so on. instance. Notify me of follow-up comments by email. The appropriate ownership and file permissions are set for the web directory This is what I got: I suspect that the first 'sudo su'. Not sure why you have it there. Do new devs get fired if they can't solve a certain bug? for cloud-init, see their specific documentation. I'm looking at the moment how to do that in an automated way at the end of the custom image creation. Error using SSH into Amazon EC2 Instance (AWS), cloud-init per-boot script on ubuntu ec2-instance, CoreOS AWS userdata "docker run" on startup won't run, I am not able to copy S3 file to EC2 instance using Userdata in CloudFormation, How to run my own shell script inside user data in ec2 instance. My added wrinkle is that I'm using terraform to instantiate the hosts via a launch configuration and autoscaling group. Do I need a thermal expansion tank if I already have a pressure tank? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Assuming, you are using Amazon Linux 2, did you check information in /var/log/cloud-init-output.log (. #cloud-config line at the top is required in order to In this article, we will discuss how to run EC2 User Data scripts as a non-root user. If you have Mac or Linux or Windows 10 then you can use the .pem format. decode it. view the log file, connect to the instance rev2023.3.3.43278. Save the template with .yml or .json as per the choice of template and follow below steps. Finally, we can review everything we have created and launch this instance. I'm using CentOS and the logic for userdata there is simple: In the file /etc/rc.local there is a call for a initial.sh script, but it looks for a flag first: initial.sh is the file that does the execution of user-data, but in the end it deletes the flag. Thanks for letting us know we're doing a good job! Theres an instance ID which is just a unique identifier for our instance. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Find centralized, trusted content and collaborate around the technologies you use most. EC2 User Data Script is not running the last bash command which starts a python file on startup. 2. Step 1: The attacker gained initial access by exploiting a public-facing service in a self-managed Kubernetes cluster hosted inside an AWS cloud account. I have specified * for simplicity. 2. For linux, I suppose the mechanism is the same, and user_data needs to be re-activated on your custom image. If your instance is sitting in a private subnet, make sure that you are running NAT Gateway or NAT instance and that your route tables are properly configured, as well as SGs and NACLs.

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