Creating a NATS Super Cluster in Digital Ocean with Helm

    Next, open up the firewall across the 3 regions to be able to access the client, leafnode and gateways ports:

    2.   doctl compute firewall add-rules $firewall --inbound-rules protocol:tcp,ports:4222,address:0.0.0.0/0
    3.   doctl compute firewall add-rules $firewall --inbound-rules protocol:tcp,ports:7422,address:0.0.0.0/0
    4.   doctl compute firewall add-rules $firewall --inbound-rules protocol:tcp,ports:7522,address:0.0.0.0/0
    5. done

    The Helm definition would look as follows for the 3 clusters:

    1. # super-cluster.yaml
    2. nats:
    3.   externalAccess: true
    4.   logging:
    5.     debug: false
    6.     trace: false
    8. cluster:
    9.   enabled: true
    11. gateway:
    12.   enabled: true
    13.   # NOTE: defined via --set gateway.name="$ctx"
    14.   # name: $ctx
    16.   gateways:
    17.   - name: do-ams3-nats-k8s-ams3
    18.     urls:
    19.     - nats://142.93.251.181:7522
    20.     - nats://161.35.12.245:7522
    21.     - nats://161.35.2.153:7522
    23.   - name: do-nyc1-nats-k8s-nyc1
    24.     urls:
    25.     - nats://142.93.251.181:7522
    26.     - nats://161.35.12.245:7522
    27.     - nats://161.35.2.153:7522
    30.     - nats://142.93.251.181:7522
    31.     - nats://161.35.12.245:7522
    32.     - nats://161.35.2.153:7522
    34. natsbox:
    35.   enabled: true

    That’s it! It should now be possible to send some messages across regions:

    1. # Start subscription in Amsterdam
    2. nats-box:~# kubectl --context do-ams3-nats-k8s-ams3 exec -it nats-box -- /bin/sh -l
    3. nats-box:~# nats-sub -s nats hello
    5. # Send messages from San Francisco region
    6. nats-box:~# kubectl --context do-sfo2-nats-k8s-sfo2 exec -it nats-box -- /bin/sh -l
    7. nats-box:~# nats-pub -s nats hello 'Hello World!'
    9. # From outside of k8s can use the external IPs
    11. $ nats-pub -s 161.35.2.153 hello 'Hello World!'