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fix(syslog-server): allow UDM tunnel source + pin collector private IP (INFRA-11)

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Two durable fixes for the root causes that took the UniFi syslog feed dark
when the collector was recreated under IaC on 2026-06-09:

1. SecurityGroup: allow udp/tcp 514 from 192.168.0.0/24. The UDM gateways
   forward via syslog-ng / unifi-core sourced from the IPsec VTI tunnel
   inside-address (192.168.0.x), not their LAN IP, so the recreated SG
   silently denied all gateway-originated syslog at the ENI. (A LAN client
   keeps its 10.10.x source and was always allowed — which masked the issue.)

2. Pin the instance PrivateIpAddress to 10.20.10.221. The fleet forwards to
   this address over the site-to-site VPN; the recreation moved it .111->.221
   and orphaned every console's syslog target. Pinning keeps it stable across
   future replacements.

DEPLOY NOTES:
- (1) was applied live out-of-band to restore service; delete that live SG
  rule immediately before `cdk deploy` or CFN errors on InvalidPermission.Duplicate.
- (2) forces an instance replacement (cdk diff: PrivateIpAddress requires
  replacement; EIP re-associates). Deploy in a maintenance window — ~2-3 min
  log-collection gap while user-data re-runs; ends at the same .221 so no
  console reconfig needed.
This commit is contained in:
Adam Moussa 2026-06-09 18:07:03 -04:00
parent 97bc751782
commit c5839e23f4
1 changed files with 15 additions and 3 deletions
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18
lib/syslog-server-stack.ts
View file

@ -56,6 +56,10 @@ export class SyslogServerStack extends cdk.Stack {
sg.addIngressRule(ec2.Peer.ipv4("10.10.0.0/16"), proto, "syslog from office VPN");
sg.addIngressRule(ec2.Peer.ipv4("10.20.0.0/16"), proto, "syslog from VPC");
sg.addIngressRule(ec2.Peer.ipv4("10.30.0.0/16"), proto, "syslog from VPN pool");
// The UDM gateways forward via syslog-ng / unifi-core, which source from the
// IPsec VTI tunnel inside-address (192.168.0.x), NOT their LAN IP. Without this
// the ENI silently drops all gateway-originated syslog (INFRA-11, 2026-06-09).
sg.addIngressRule(ec2.Peer.ipv4("192.168.0.0/24"), proto, "syslog from UDM IPsec tunnel source");
}
// SSH (SSM is the primary access path; 22 kept for break-glass from office/VPC).
@ -239,9 +243,17 @@ export class SyslogServerStack extends cdk.Stack {
],
});
// Re-associate the existing Elastic IP (184.72.154.32) so the UniFi fleet's
// forwarding target is unchanged. The allocation is UNMANAGED (referenced by
// ID) — CloudFormation can associate it but never release it.
// Pin the private IP. The UniFi fleet forwards to this address over the
// site-to-site VPN (the EIP is NOT the forwarding target — gateway-originated
// traffic to a public IP would leave over the WAN). When the instance was
// recreated under IaC on 2026-06-09 the private IP changed .111 -> .221 and
// silently orphaned every console's syslog target. Pinning it keeps the target
// stable across future replacements (INFRA-11). Must be inside this subnet's CIDR.
(instance.node.defaultChild as ec2.CfnInstance).privateIpAddress = "10.20.10.221";
// Re-associate the existing Elastic IP (184.72.154.32). The allocation is
// UNMANAGED (referenced by ID) — CloudFormation can associate it but never
// release it. Kept for break-glass / direct reachability; not the syslog target.
new ec2.CfnEIPAssociation(this, "EipAssociation", {
allocationId: "eipalloc-006bdefc9802f3285",
instanceId: instance.instanceId,