Ravi Sir's Cards › AWS
Which port must EFS security groups allow?
What is a VPC: your own private network inside one AWS Region, example ThreeTierVpc 10.0.0.0/16.
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What this card says
What it is
NFS TCP 2049 between EC2 and EFS mount targets.
Why it matters
Opening 2049 to the world is unsafe; source the EC2 security group id.
How / example
EFS SG inbound 2049 from sg-ec2; then mount -t efs succeeds.