#ec2
Amazon EC2 from instance types and pricing models through to MTU, launch failures and quotas — the practical details that decide cost and reliability.
7 articles tagged #ec2, newest first.
Unassociated Elastic IPs: How to Find Them and What They Cost
Unassociated Elastic IPs bill hourly and eat a quota of five per region. What they cost, the command that lists yours, and what to check before releasing.
EC2 MTU: 1500 vs 9001, and Why Jumbo Frames Break at the VPC Edge
EC2 instances default to a 9001-byte MTU inside the VPC and 1500 bytes to the internet. Where the boundary sits, and why transfers hang while pings succeed.
AWS `AddressLimitExceeded`: What It Means and How to Fix It
AddressLimitExceeded is the Elastic IP quota — five per region by default, and usually full of addresses nothing is using. Causes, fixes and checks.
AWS `Client.InternalError`: What It Means and How to Fix It
Client.InternalError kills an EC2 instance right after launch, nearly always because of a KMS key it cannot use. The ranked causes and their fixes.
AWS `InsufficientInstanceCapacity`: What It Means and How to Fix It
InsufficientInstanceCapacity is AWS running out of physical capacity in that availability zone — not a quota. What to change to get an instance now.
AWS `UnauthorizedOperation`: What It Means and How to Fix It
UnauthorizedOperation from the EC2 API means IAM evaluated your request and said no. The ranked causes, a fix for each, and how to prove which one.
AWS `VcpuLimitExceeded`: What It Means and How to Fix It
VcpuLimitExceeded is an EC2 account quota, not a capacity shortage — and this one you can raise. How to read the limit, and how to request more.