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在Digital Ocean用Helm创建超级NATS群集

Let's create a super cluster using NATS Gateways. First let's create 3 different clusters in NYC, Amsterdam, and San Francisco:

doctl kubernetes cluster create nats-k8s-nyc1 --count 3 --region nyc1
doctl kubernetes cluster create nats-k8s-sfo2 --count 3 --region sfo2
doctl kubernetes cluster create nats-k8s-ams3 --count 3 --region ams3

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

for firewall in `doctl compute firewall list | tail -n 3 | awk '{print $1}'`; do
  doctl compute firewall add-rules $firewall --inbound-rules protocol:tcp,ports:4222,address:0.0.0.0/0
  doctl compute firewall add-rules $firewall --inbound-rules protocol:tcp,ports:7422,address:0.0.0.0/0
  doctl compute firewall add-rules $firewall --inbound-rules protocol:tcp,ports:7522,address:0.0.0.0/0
done

For this setup, we will create a super cluster using the external IPs from the nodes of the 3 clusters. For a production type of setup, it is recommended to use a DNS entry and an A record for each one of the servers.

for ctx in do-ams3-nats-k8s-ams3 do-nyc1-nats-k8s-nyc1 do-sfo2-nats-k8s-sfo2; do
  echo "name: $ctx"
  for externalIP in `kubectl --context $ctx get nodes -o jsonpath='{.items[*].status.addresses[?(@.type=="ExternalIP")].address}'`; do 
    echo "- nats://$externalIP:7522"; 
  done
  echo
done

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

# super-cluster.yaml
nats:
  externalAccess: true
  logging:
    debug: false
    trace: false

cluster:
  enabled: true

gateway:
  enabled: true

  # NOTE: defined via --set gateway.name="$ctx"
  # name: $ctx

  gateways:
  - name: do-ams3-nats-k8s-ams3
    urls:
    - nats://142.93.251.181:7522
    - nats://161.35.12.245:7522
    - nats://161.35.2.153:7522

  - name: do-nyc1-nats-k8s-nyc1
    urls:
    - nats://142.93.251.181:7522
    - nats://161.35.12.245:7522
    - nats://161.35.2.153:7522

  - name: do-sfo2-nats-k8s-sfo2
    urls:
    - nats://142.93.251.181:7522
    - nats://161.35.12.245:7522
    - nats://161.35.2.153:7522

natsbox:
  enabled: true

Let's deploy the super cluster with Helm using the name of cluster as the name of the gateway:

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

hashtag
Using leafnodes and NATS super clusters to communicate across regions

You can also create a multi-region NATS topology by using leafnodes connecting to a NATS super cluster (which could also be a much simpler way!).

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

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

Let's deploy the super cluster with Helm using the name of cluster as the name of the gateway:

It should now be possible to send some messages across regions:

Or from outside of k8s can use the external IPs:

Send a message from Amsterdam to SFO via the super cluster connected with leafnodes:

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