2.7 KiB
verae-nats-cluster
Three distinct Proxmox LXC guests running NATS JetStream as a cluster, on the private bridge only. This is the test stand before the same layout moves to separate hardware.
Forgejo: https://git.georgelambert.org/marchon/verae-nats-cluster
SSH: ssh://git@git.georgelambert.org:2223/marchon/verae-nats-cluster.git
| Guest | VMID | vmbr1 IP |
Client | Cluster | Monitor |
|---|---|---|---|---|---|
| nats-a | 511 | 10.10.10.21 | :4222 |
:6222 |
127.0.0.1:8222 |
| nats-b | 512 | 10.10.10.22 | :4222 |
:6222 |
127.0.0.1:8222 |
| nats-c | 513 | 10.10.10.23 | :4222 |
:6222 |
127.0.0.1:8222 |
Cluster name: verae. Client URL:
nats://10.10.10.21:4222,nats://10.10.10.22:4222,nats://10.10.10.23:4222
Not on vmbr0. Not 0.0.0.0. Host lab NATS on 127.0.0.1:4222 is left running so current keep/fleet/middleware stay up until you cut over.
# on NS1 (the Proxmox host)
git clone ssh://git@git.georgelambert.org:2223/marchon/verae-nats-cluster.git
cd verae-nats-cluster
bash scripts/create-cluster.sh
bash scripts/status.sh
bash scripts/test.sh
Test-env cut-over (keep/fleet/middleware on NS1):
# 1) create product streams (replicas=3)
bash scripts/ensure-streams.sh
# 2) fleet overlay nats.url + services/*.json already list the three URLs
# 3) restart fleet and keep with NATS_URL from client.env
JETSTREAM_REPLICAS=3 on middleware. Host 127.0.0.1:4222 can stay up unused. Zapier cloud never talks to NATS.
nkeys/mTLS: verae-nats-accounts still has the INTERNAL/LEAF sketch. Do not enable accounts on this cluster until every client passes credentials in NATS_URL. Private vmbr1 is the current isolation.
Message speed (throughput + delay)
From a client that is not a nats- server* (LXC 510 verae-px-worker):
# on NS1
bash scripts/bench.sh
That writes results/<utc>/ and copies a summary to BENCH.md. Core NATS is fire-and-forget; JetStream rows use file storage and replicas=3. Ping delay is sequential RTT; flood delay is queueing under burst.
Latest run (20260912T045131Z):
| Kind | Load | Result |
|---|---|---|
| Core 1p1s 50k×128 B | pub/sub | ~1.20M msgs/s aggregate |
| Core 8p8s 200k×128 B | pub/sub | ~2.01M msgs/s aggregate |
| Core 4p4s 50k×1 KiB | pub/sub | ~630k msgs/s (~616 MB/s aggregate) |
| JetStream r=3 file | 1–4 pubs, 128 B | ~16k durable pubs/s |
| JetStream r=3 file | 4 pubs, 1 KiB | ~13.5k durable pubs/s |
| Ping 1k×128 B | sequential RTT | avg 0.307 ms, p99 0.734 ms |
| Flood 8p 20k×128 B | burst queueing | avg 454 ms |
Hardware move: same three configs, three boxes, private NIC only — change IPs in cluster.env and conf/nats.conf.tmpl.