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Ec2 instance

The defult user for aws is the ec2-user ## Changing the type

Amazon EBS-Optimized Instances

Are set up to work really well with Amazon Elastic Block Store (EBS)

Aws Docs

User data

it contains a scirpt that starts at the start of the instance

Amis

Enhanced Networking

EC2 Enhanced Networking (SR-IOV)

Works for newer generation EC2 Instances - Benefits - Higher bandwith - Higher PPS(packet per second) - Lower latency

  • Options
    • Elastic Network Adapter (ENA)
      • Up to 100Gbps
    • Intel VF
      • Up to 10Gps LEGACY!
# To check weather this mode is present 
modinfo ena 
# Then check what dirver the eth iterface is using 
ethtool -i eht0

Elastic Fabric Adapter(EFA)

Great for high-performence compiuting(HPC) - Improved ENA for HPC, only works with Linux - Great for inter-node communication ,thightly copuled worklods #kubernetes - Message Passing Interface (MPI) standard - Bypasses the underlying Linux Os - low-latency - relaibe transport

Placements Groups

Sometimes you wnat control over the instance placement strategy - During creation u can specyfie one of the strategies - Cluster - Spread - Partition

Shutdown Behavior

How shoud the instace reacte when shutdown is done - Stop(default) - Terminate - Hiberante - The in-memory (RAM) state is preserverd - The instace boot fastert(the OS is not stopped/restarted)

AWSConsole Attribute: InstanceInitiatedShutdownBehavior - This attribute determines the behavior of the instance when it is shut down from within the operating system. - Important Note: - You can only modify this attribute from inside the instance. - Exiting from the console does not affect this setting. Here’s a revised version of your text regarding Termination Protection:

Termination Protection

This protection works only if u want to terminate from consoleor CLI Termiantion protection visual - Overview: If an instance has its shutdown behavior set to terminate and termination protection is enabled - Shutting down the instance from the operating system will still result in the instance being terminated.

  • Important Note: This occurs because the shutdown action is initiated from within the operating system, rather than through the AWS Management Console.

Trouble shoot

Error Types

  • #InstanceLimitExeeded
    • Reached the max limit of the vCPU per region
    • On-Demand instance limits are set on a per-region baisis
      • By defult with On-Demand (A,C,D,H,I,R,T,Z) instance types you’ll have 64vCPUs
    • Resolution: Launch in diffrent region or request limit increase in given region
      • U can find inormation is either to check quota or direcly the instacne limits or direcly the instance limits
  • #InsufficientInstacneCapicity
    • Aws does not have enough On-Demand capicity in the particular AZ
      • Its the Aws issue so either wait change the Az resize or choose different type
  • #InstanceTerminatesImmediately(goes from pedning straight to terminated)
    • Reached EBS volume limit
    • EBS snapshot is corrupt
    • The root EBS voulume is encrypted and u don’t have permissions
    • Your missing a requierd part of configuration
    • Resolution: Check out the Description inside the EC2 console

SSH Vs Ec2 connector

You can’t connect to the EC2 instance in the browser using your local IP address. Instead, you need to:

AWS Docs 1. Find the EC2_INSTANCE_CONNECT IP range for the specific region you are using. 2. Add this IP range to your allowed IP lists.

Purchasing options

Ec2 purchasing options