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The collector's remote-syslog spool had no rotation, so each gateway's /var/log/remote/<host>/<host>.log grew unbounded. Low risk at the old ~109 events/day, but the gateways now forward ~60k/day. CloudWatch (90d) is the system of record; the local files are only a CW-agent spool, so keep a short 7-day compressed window. copytruncate keeps rsyslog's open dynaFile handles valid (truncate in place). Applied live already; this codifies it so an instance replacement keeps it (mirrors the existing netflow-retention timer). Deploying this user-data change forces an instance replacement (userDataCausesReplacement) — the EIP re-associates and the forwarding target is unchanged, so do it in a window. |
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| .github/workflows | ||
| bin | ||
| lib | ||
| .gitignore | ||
| cdk.context.json | ||
| cdk.json | ||
| package-lock.json | ||
| package.json | ||
| README.md | ||
| tsconfig.json | ||
syslog-server
CDK stack for the syslog-server EC2 collector: receives remote syslog
(UDP/TCP 514) from the office UniFi fleet over its Elastic IP and ships it to
the unifi-syslog CloudWatch Logs group via the CloudWatch agent.
Brought under IaC for INFRA-12 (AWS audit L-6). Previously a console/CLI instance with no drift detection.
Architecture
office UniFi devices ──syslog/514──▶ EIP 184.72.154.32 ──▶ EC2 (rsyslog)
│
/var/log/remote/<host>/*.log
│
CloudWatch agent ──▶ unifi-syslog (90d)
│
Syslog-NoIncomingLogs alarm ──▶ site-alerts
| Resource | Value |
|---|---|
| Instance | syslog-server, t4g.nano, Amazon Linux 2023 (arm64), 30 GiB encrypted gp3 |
| Subnet | subnet-0eea820effe1b3ae5 (public, us-east-1a, vpc-0d3d4b67bd0cf8a68) |
| Elastic IP | 184.72.154.32 (eipalloc-006bdefc9802f3285) — unmanaged, re-associated by ID |
| Security group | syslog-server — 514 tcp/udp + 22 from office IPs + VPC/VPN CIDRs; 2055/2056 udp reserved (netflow/sflow) |
| IAM role | syslog-server-role — AmazonSSMManagedInstanceCore + CloudWatchAgentServerPolicy |
| Log group | unifi-syslog (90-day retention) — created/retained by the CW agent, not a CFN resource (holds history; see stack comment) |
| Alarm | Syslog-NoIncomingLogs — IncomingLogEvents Sum < 1 over 2×1-day, ALARM-only → site-alerts |
Access
SSM Session Manager (no key pair). SSH 22 is open from office/VPC for break-glass only.
Deploy
CI/CD via the org reusable workflows (ci-typescript-cdk.yaml,
cd-cdk.yaml); merges to main deploy through the githubdeploy-syslog-server
OIDC role. No Docker assets, so a local cdk deploy is also safe.
npm ci
npm run diff
npm run deploy
Notes
- EIP is unmanaged. CloudFormation associates it but never releases it, so the public forwarding target survives any instance replacement.
- AMI is pinned in
cdk.context.json(cachedInContext). An AL2023 AMI change forces instance replacement — refresh deliberately withcdk context --reset <ami key> && cdk synth. - To widen device coverage of the forwarded syslog feed, see INFRA-11 (UniFi controller remote-logging config).