AWS Classroom Series – 07/Dec/2020

EC2 instance Status Checks

• Lets create an ec2 instance and look at status checks
• Types of Status Checks
  • System Status Checks:
    • They check AWS Systems (physical server) on which your ec2 instance runs
    • These check detect underlying probles with your instance that require AWS involvement to repair
    • The failure represents one of the following
      • Loss of network connectivity
      • Loss of System Power
      • Software issues on Physical Host
      • Hardware issues on Physical Host
  • Instance Status Checks:
    • They check software & network configuration of your ec2 instance.
    • This check is performed by send ARP (Address Resolution Protocol) packet to the Network interface.
    • This failure requires your involvement to repair
    • The failure represent
      • Failed System Checks
      • Incorrect network or start up configuration
      • No Memory
      • Corrupted file system
      • In compatible kernel
• Troubleshooting can be done as shown below and select system log
• Get Instance Screenshot
• Resizing Instance types can be done when your ec2 instance is stopped

Scenario: Create a linux ec2 instance with apache server installed

• In ubuntu machine to install apache server

sudo apt-get update
sudo apt-get install apache2 -y

• One approach is create an ec2 instance and login into ec2 instance and execute the commands
• AWS has one more approach which is called as user data

User data

• While we launch ec2 instance user data is the way to pass the automated configuration task
• Lets try to create an ubuntu instance with the following script as userdata

#!/bin/bash
sudo apt-get update
sudo apt-get install apache2 -y

• By default user data scripts run only during boot cycle when you first launch an instance
• To get further into the details, we need to understand retrieving dynamic data and metadata versions
• We also need to understand cloud-init
• Exercise: Ensure you go through yaml tutorial before tomorrow’s session Refer Here

Exercises:

• Create a Key pair from AWS CLI

aws ec2 create-key-pair --key-name 'forfun' --query 'KeyMaterial' --output text > forfun.pem
chmod 400 forfun.pem

• Create an ec2 instance with this keypair and login into ec2 instance without using aws console

aws ec2 run-instance

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