Why Elastic Beanstalk Security Group Didn't Change in Jenkins Job Rebuild?
Question
You are an AWS DevOps engineer in a company, and you created a job in Jenkins to use a script to build an Elastic Beanstalk environment.
An eb config command has been used to configure a Security Group for an Elastic Load Balancer.
After some time, another colleague found that the Security Group should be changed to another one.
He modified this configuration option with a config file in the .ebextensions folder.
However, when the Jenkins job was rebuilt, the Security Group did not change to the new one.
What is the reason and how would you fix this issue?
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D.Correct Answer - D.
The key to this question is that there are different priorities when configurations in Elastic Beanstalk are applied.
Settings specified by the AWS Management Console, EB CLI, AWS CLI, and SDKs belong to the ones applied directly to the environment and have the highest priority.
Option A is incorrect: Because the config file in .ebextensions can modify the Security Group as long as others do not override it.
Option B is incorrect: Because the issue is not the sequence of execution but the precedence for different options.
Option C is incorrect: Because when conflict happens, the default value is not used.
Instead, the one with the highest priority is applied.
Option D is CORRECT: Because this explains correctly the cause and possible solution based on the above explanation.
The correct answer is B. The .ebextensions config file was processed first. And eb config ran next and overrode the .ebextensions config file. Modify the script in Jenkins so that the .ebextensions config file is processed after eb config.
Explanation: When Elastic Beanstalk creates an environment, it processes the configuration files in the following order:
- The container-specific default configuration file
- The .ebextensions configuration files, in alphabetical order
- The container-specific configuration file specified in the environment configuration
- The Elastic Beanstalk-specific configuration file specified in the environment configuration
In this case, the .ebextensions configuration file was processed first and then the eb config command was executed, which overrode the Security Group setting from the .ebextensions file. Therefore, the Security Group did not change to the new one.
To fix this issue, the Jenkins job should be modified to ensure that the .ebextensions file is processed after the eb config command. This can be done by modifying the script in Jenkins to use the following command:
csseb config <environment-name> --cfg <config-name> && eb deploy --label <label-name> This command will ensure that the eb config command is executed first, followed by the deployment of the application. The .ebextensions file will be processed after the eb config command, ensuring that the Security Group setting is not overridden.
Option A is incorrect because the Security Group name can be changed in the .ebextensions config file.
Option C is incorrect because there is no conflict between the Security Group settings in eb config and .ebextensions. The eb config command simply overrode the setting in .ebextensions.
Option D is incorrect because the settings in the .ebextensions folder can override those in the EB CLI command. The issue in this case was with the order of processing of the configuration files, not with the ability to override settings.
