EC2

60 new EC2 instances in az?

soft limit of 20 EC2 instances per region; increase form and retry the template after your limit has been increased.

Can’t connect

• Security group port not open
• no IG on VPN; no route
• no public IP (EIP or public)
• no NAT; NAT has packet forwarding disabled

Can’t connect EBS

• EBS volume in wrong AZ
• EBS volume in wrong

Can’t create more instances

• Maxed out # of instances in VPC

AMI unavailable

• AMIs are region specific; renamed when copied between regions

Slow

• Increase instance size
• GP to IOPS based storage

Placement group capacity error

• Stop and start all instances

ELB

Load balancing not working between zones

• Enable Cross-Zone Load Balancing

Instances not being added to ELB

• Health check too long - could be # of checks or time between checks

• Configure auto-assign public IP address

Traffic not reaching instances

• Port mismatch
• ELB SG is misconfigured

EC2 Access logs show ELB instance IP

• Config ELB to forward source IP to instance

Instances start and stop

Boot, connection, restore issue on instance (Windows/Linux)? EC2Rescue