AWS

Posts

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  [AWS] NAT Gateway How-To & Setup Guide — Private Subnet Internet & Cost Optimization

  A NAT Gateway gives Private Subnet EC2s secure outbound internet — step-by-step creation, EIP attach, routing, plus cost analysis and the NAT-instance option.

  2026-02-14·#AWS #NAT Gateway #VPC #networking #cost-optimization
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  [AWS Cost] A Guide to Cutting AWS Infrastructure Costs by 55% (Graviton Migration & Fixed-Cost Optimization Strategy)

  Cut AWS costs up to 55% (about ₩2M/month): x86→ARM/Graviton migration and swapping ALB, NAT, and RDS for Nginx, a NAT instance, and an EC2 DB — real quotes.

  2026-02-12·#AWS #cost-optimization #Graviton #ARM #RDS
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  [AWS] EC2 SSH Connection Error: How to Fix the UNPROTECTED PRIVATE KEY FILE Error (ssh pem key permission setup)

  When SSH-ing into EC2 you get 'WARNING: UNPROTECTED PRIVATE KEY FILE' — the .pem key's permissions are too open. Fix it instantly with chmod 400.

  2026-02-08·#AWS #EC2 #SSH #troubleshooting #Linux
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  [AWS Infra] Building & Configuring a NAT Instance to Cut NAT Gateway Costs (Part 2)

  Part 1's community AMI runs an end-of-support OS. Part 2 builds a NAT instance on modern Ubuntu with iptables (forwarding + MASQUERADE), persisted on reboots.

  2024-12-29·#AWS #NAT Instance #iptables #networking #cost-saving
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  [AWS Infra] Building & Configuring a NAT Instance from an AMI to Cut NAT Gateway Costs (Part 1)

  A NAT Gateway costs $32+ a month, so I connected a private subnet to the internet with an EC2 NAT instance instead — Part 1 uses the AWS community NAT AMI.

  2024-12-28·#AWS #NAT Instance #VPC #networking #cost-saving