ec2 user data script not running ec2 user data script not running

So, that EC2 User data script is only run once and when it first starts, and then will never be run again. amazon-ec2 cloud-init Share Improve this question more information, see IAM roles for Amazon EC2. You can read more about all that in the cloud-init Boot Stages docs section. rm /var/lib/cloud/instances/*/sem/config_scripts_user. I'm glad this was encouraged on serverfault. In configuration, keep everything as default and click on Next. 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. Do I need a thermal expansion tank if I already have a pressure tank? Why don't you echo out some progress information in your userdata script, step by step, and then check the console output afterwards? User data doesn't run on subsequent reboots or starts. without the #cloud-boothook it does not work, but with it, it works. You should see the PHP information page. Theres an instance ID which is just a unique identifier for our instance. It may be affecting execution of the existing shell, where user data is running. Either it's because User Data is only for running commands on newly created instances (such as bootstrapping instances for scaling), or because the documentation is out of date. The type of network card do you want to attach to your EC2 instance, the speed of the card, and what kind of public IP do you want? EC2 User Data Script: It is a bootstrap script to configure the instance at the first launch. How to Provide the Static IP to a Docker Container? So this is necessary if we use the SSH utility to access our instance. So lets go ahead and see the step by step instruction to execute EC2 user data script using CloudFormation. Wait you saw the echo output in the logs? User data must be base64-decoded when you retrieve it. Refresh the page, check Medium 's site. To update the instance user data, you must first stop the instance. This URL is the public DNS address of your instance followed by a has finished successfully. In a very simple terms if I say, user data is user data/commands that you can specify at the time of launching your instance. Be sure to delete the user data scripts from As you might already know, EC2 user data script, lets you bootstrap your EC2 instance by executing some commands(that you specify) dynamically after your instance is booted. But, the very last bash command in the script is supposed to start a python script which will run (indefinitely/ or . In the following examples, the commands from the Install a LAMP Web Server on Amazon Linux 2 are converted to a shell script and a set So I tried to pass my own user-data when instance launch, this is my user-data: But there is no file in this path: /home/ec2-user/user-script-output.txt. But, the very last bash command in the script is supposed to start a python script which will run (indefinitely/ or however long I decide to keep it running). command as follows: To retrieve the user data for an instance, use the describe-instance-attribute command. How to Pass the Query String Parameters to AWS Lambda Function or HTTP Endpoint? For information User data shell scripts must start with the #! For additional debugging information, you can 1. Similar to other posts on this topic, we are going to install apache web server on an EC2 instance using EC2 User Data. The user data are stored in files name part_001 etc. Be sure to use the file:// prefix to specify the file. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 2023, Amazon Web Services, Inc. or its affiliates. view the log file, connect to the instance It is to automate boot tasks such as. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. It supports only the user_data key. cloud-init, see http://cloudinit.readthedocs.org/en/latest/index.html. How much compute power and cores do you want on this virtual machine i.e. command line tools), or as base64-encoded text (for API calls). Can you explain what this is supposed to do? I have added below line in /etc/rc.local to make it happen. and Manage Windows instance configuration in the Often times that actions that an. rm /var/lib/cloud/instance/sem/config_scripts_user. The text/cloud-config content type overrides how frequently user data is run in the cloud-init package by setting the SCRIPTS-USER parameter to ALWAYS. 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 (. If these things still ain't working, you can test it further by forcing user-data to run manually. How can I utilize user data to automatically run a script with every restart of my Amazon EC2 Linux instance? The security group associated with your instance is configured to allow SSH (port 22) AWS support for Internet Explorer ends on 07/31/2022. You should see the PHP information page. 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. Please refer to your browser's Help pages for instructions. It actually took me a few hours of research and testing, so once I figured it out, I created this question to help the next person looking for a definitive answer. With modify-instance-attribute, the AWS CLI does not perform base64 encoding of the user data for you. The User data field is For windows, it can be done by checking a box in Ec2 Services Properties. Is a collection of years plural or singular? Allow enough time for the instance to launch and run the directives in All rights reserved. vegan) just to try it, does this inconvenience the caterers and staff? 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. Also, the limit on user data size is 16 KB. Note that this includes a password passed in thru both the user data and powershell command line and is a bad security practice because they can be viewed later. information, see Create a security group. Connecting an AWS EC2 Instance of a Private Subnet using Bastion Host, Allocate Elastic IP-Address to EC2 Instance in AWS. On Windows, you can use the AWS Tools for Windows PowerShell instead of using the AWS CLI. Using cloud-config syntax, the user can specify certain things in a human-friendly format. Awesome content. For more information, see Add rules to a security group. When you launch an EC2 instance, you can specify your user data like below. 1. Then I found this article about user data formatting user That makes sense, if user-data can come in multiple parts, maybe cloud-init needs cloud-init commands in one place and the script in the other. Programming HOW-TO at the Linux Documentation Project (tldp.org). Not sure why you have it there. to that file. Select the instance and choose Instance state, EC2 AMI version. scripts and cloud-init directives. This is a major lifesaver for trouble shooting user data issues. multi part archive, see cloud-init Formats. Copyright 2020 CloudKatha - All Rights Reserved, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Telegram (Opens in new window), Click to share on WhatsApp (Opens in new window), How to Execute EC2 User Data Script using CloudFormation. Unfortunately I cannot share the script due to confidentiality so if any has any tips on what could possible be wrong I'd love to hear from you. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, AWS - UserData is not executed for instance created from custom image. distributions. If this option is disabled, either Steps to create EC2 User data Specify user data while launching EC2 Instance Allow traffic on port 80 and 443 on Security Group Verify User data Execution/Apache Installation Let's do all these steps one by one. It can take You can rent virtual machines on EC2, theyre called EC2 instances. following tasks are performed by the user data: The distribution software packages are updated. sudo cloud-init modules -m final So, therefore, you need to copy the new IPv4 and make sure to use HTTP to have access back to our EC2 instance. and the files contained within it. /bin/bash). file to include both a shell script and cloud-init directives in your user data. To learn more, see our tips on writing great answers. information, see Auto-assign Public IP in the Network settings So the EC2 User Data has a very specific purpose. However, you can configure your user data script and cloud-init directives with a mime multi-part file. In the navigation pane, choose Instances. For additional debugging information, you can create a Mime multipart In this article, we are going to pass below code. archive that includes a cloud-init data section with the For a great introduction on shell scripting, see Thanks for contributing an answer to Stack Overflow! https://console.aws.amazon.com/ec2/. The ec2-user is added to the apache group. Why do small African island nations perform better than African continental nations, considering democracy and human development? I have an EC2 instance which I bootstrapped with some user data that runs some updates and installs some other software on startup. base64 command to decode it. Why are non-Western countries siding with China in the UN? check that the security group you are using contains a rule to allow HTTP (port 80) traffic. Open the Amazon EC2 console. The bash shell script creates a file Also, because the The new user data is visible on your instance after you start it; traffic so that you can connect to the instance to view the output log files. The following is example output with the user data base64 encoded. Making statements based on opinion; back them up with references or personal experience. Replace it with an 'echo start'. The cloud-init user directives can be passed to an instance at launch the same way that a This means I also need to declare my template file like so: But I was still getting an error in the cloud init logs Here is the code to reactivate start on windows using powershell: (I know the question focus linux, but it could help others ). Do I need a thermal expansion tank if I already have a pressure tank? You modified or configured user data, but it doesn't run on instance launch. EC2 User Data scripts will not run any commands as non-root user I am creating an EC2 Launch Template with the following (exact) User Data: #!/bin/bash echo "hello" >> /home/ubuntu/1.txt sudo -u ubuntu curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip" >> awscli-download.txt echo "hello" >> /home/ubuntu/2.txt Find centralized, trusted content and collaborate around the technologies you use most. You should allow a few minutes of extra time for the tasks to complete For more information, see Add rules to a security group. . Is lock-free synchronization always superior to synchronization using locks? Bootstrapping means launching commands when the machine starts. You can use the AWS CLI to specify, modify, and view the user data for your instance. directory on any instance launched from the AMI. Why are physically impossible and logically impossible concepts considered separate in terms of probability? Do I need a thermal expansion tank if I already have a pressure tank? Does a summoned creature play immediately after being summoned by a ready action? On certain instances, you may see symlinks with the instance id at the above script location. > > For our example, in a web browser, enter the URL of the PHP test command. In the example below, the directives create and configure a web server on Amazon Linux 2. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/. Step 2. A limit involving the quotient of two sums, Short story taking place on a toroidal planet or moon involving flying, Theoretically Correct vs Practical Notation, Minimising the environmental effects of my dyson brain, About an argument in Famine, Affluence and Morality, Follow Up: struct sockaddr storage initialization by network format-string. before you create an AMI from the instance. Visit Stack Exchange Tour Start here for quick overview the site Help Center Detailed answers. 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