Learn the correct command to search for and install system updates on an Amazon EC2 instance to keep your AWS infrastructure secure and up-to-date.
Table of Contents
Question
Which command searches for and installs system updates for an EC2 instance?
A. yum update -y
B. chkconfig httpd on
C. service httpd start
D. yum install httpd -y
Answer
A. yum update -y
Explanation
“yum install httpd -y” installs Apache.
“service httpd start” starts Apache.
“chkconfig httpd on” configures Apache to start every time the instance restarts.
The ‘yum update -y’ command is used on Amazon Linux, Red Hat, and CentOS EC2 instances to search for available system updates and install them automatically. Here’s what each part of the command does:
- ‘yum’ is the package manager used by these Linux distributions
- ‘update’ tells yum to search for available updates for all installed packages and update them to the latest version
- ‘-y’ automatically answers “yes” to any prompts during the update process, allowing it to run without user interaction
The other commands listed are used for different purposes:
- ‘chkconfig httpd on’ enables the Apache web server (httpd) to start automatically on system boot
- ‘service httpd start’ manually starts the Apache web server
- ‘yum install httpd -y’ installs the Apache web server package
So in summary, to search for and install system updates on an EC2 instance, ‘yum update -y’ is the correct and complete command to use. Regularly running this keeps your EC2 instance updated and helps maintain the security and stability of your AWS infrastructure.
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