From Zero to K8S to Leafnodes using Helm
First, we need a number of Kubernetes clusters to be setup already. In this case we'll create a few in Digital Ocean using the doctl tool but you could use any K8S solution available:
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brew install doctl
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doctl kubernetes cluster create nats-k8s-sfo2 --count 3 --region sfo2
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doctl kubernetes cluster create nats-k8s-ams3 --count 3 --region ams3
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Next, get your NGS credentials with leafnodes enabled. For this follow these instructions and choose the Developer plan which is free and will allow you to create leafnode connections for a couple of clusters. Once you got the credentials, upload them as a secret to your K8S clusters:
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for ctx in do-ams3-nats-k8s-ams3 do-sfo2-nats-k8s-sfo2; do
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kubectl --context $ctx create secret generic ngs-creds --from-file $HOME/.nkeys/creds/synadia/NGS/NGS.creds
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done
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Install Helm3 and add the NATS helm chart repo:
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brew install helm
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helm repo add nats https://nats-io.github.io/k8s/helm/charts/
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helm repo update
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Create the config that adds the leafnode connection to Synadia's NGS:
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# nats.yaml
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leafnodes:
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enabled: true
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remotes:
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- url: tls://connect.ngs.global:7422
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credentials:
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secret:
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name: ngs-creds
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key: NGS.creds
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natsbox:
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enabled: true
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Deploy it to your K8S regions:
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for ctx in do-ams3-nats-k8s-ams3 do-sfo2-nats-k8s-sfo2; do
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helm --kube-context $ctx install nats nats/nats -f nats.yaml
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done
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To test the multi-region connectivity by using the nats-box container that got deployed in each cluster:
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kubectl --context do-ams3-nats-k8s-ams3 exec -it nats-box -- nats sub -s nats hello
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Listening on [hello]
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while true; do
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kubectl --context do-sfo2-nats-k8s-sfo2 exec -it nats-box -- nats pub -s nats hello 'Hello World!'
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done
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Results from the subscribe session:
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[#1] Received on [hello]: 'Hello World!'
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[#2] Received on [hello]: 'Hello World!'
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[#3] Received on [hello]: 'Hello World!'
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[#4] Received on [hello]: 'Hello World!'
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[#5] Received on [hello]: 'Hello World!'
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[#6] Received on [hello]: 'Hello World!'
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[#7] Received on [hello]: 'Hello World!'
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[#8] Received on [hello]: 'Hello World!'
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[#9] Received on [hello]: 'Hello World!'
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