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Self-hosted Forgejo git server for repo archival and mirroring
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Adam Moussa a500d69716 Add Forgejo CDK stack 
EC2 (t4g.small, arm64) in private subnet with VPN-only access,
DLM nightly snapshots, and Route53 DNS at forgejo.seahaven.com.
2026-05-11 17:52:37 -04:00
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README.md

forgejo

Self-hosted Forgejo git server for archiving GitHub repos and mirroring active ones. Runs on a single EC2 instance within the Sea Haven VPC, accessible only via VPN.

Architecture

  • EC2: t4g.small (arm64), Amazon Linux 2023, 50GB gp3 EBS
  • Network: Private subnet (us-east-1a), VPC + VPN access only
  • DNS: forgejo.seahaven.com (Route53 A record → private IP)
  • Backup: Nightly EBS snapshots via DLM, 7-day retention
  • Admin access: SSM Session Manager (no SSH port exposed)

Ports

Port Protocol Purpose
3000 HTTP Web UI + HTTP git clone
2222 SSH Git SSH operations

Both ports are restricted to VPC (10.20.0.0/16) and office VPN (10.10.0.0/16).

First-time setup

After the stack deploys, connect via SSM and create the admin user:

aws ssm start-session --target <instance-id>

sudo -u forgejo /usr/local/bin/forgejo admin user create \
  --admin \
  --username adam \
  --password '<password>' \
  --email adam@seahavenind.com \
  --config /etc/forgejo/app.ini

Then access the web UI at http://forgejo.seahaven.com:3000.

Migrating repos from GitHub

Archived repos (one-time import)

In the Forgejo web UI: New Migration → GitHub → paste the GitHub repo URL. Use a GitHub personal access token for private repos. These are full imports (code, issues, PRs, releases).

Active repos (mirror sync)

Same migration flow, but check This Repository Will Be A Mirror. Forgejo polls GitHub hourly (DEFAULT_INTERVAL = 1h in app.ini) and keeps the mirror in sync.

Deployment

npm install
npx cdk deploy

CI/CD is handled by GitHub Actions — PRs run CI, merges to main deploy via the reusable CDK workflow.

Updating Forgejo

Update the FORGEJO_VERSION constant in lib/forgejo-stack.ts and deploy. This replaces the instance, so ensure the latest EBS snapshot is available for data recovery if needed. Alternatively, update in-place via SSM:

aws ssm start-session --target <instance-id>

sudo systemctl stop forgejo
sudo curl -Lo /usr/local/bin/forgejo "https://codeberg.org/forgejo/forgejo/releases/download/v<NEW_VERSION>/forgejo-<NEW_VERSION>-linux-arm64"
sudo chmod +x /usr/local/bin/forgejo
sudo systemctl start forgejo