coiouhkc/short-and-sweet-consul-intro

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Short and Sweet

Consul Intro

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Service discovery/ service registry

See

• https://www.nginx.com/blog/service-discovery-in-a-microservices-architecture/

• https://www.baeldung.com/cs/service-discovery-microservices

• https://dzone.com/articles/service-discovery-in-a-microservices-architecture

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Consul

See https://www.consul.io/

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Notable mentions

See

• https://github.com/Netflix/eureka

• https://zookeeper.apache.org

• https://github.com/coreos/etcd

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Forerunner

See https://www.osgi.org/

TODO: small demo

See https://www.knopflerfish.org/releases/current/docs/javadoc/org/osgi/framework/BundleContext.html#registerService(java.lang.Class,%20S,%20java.util.Dictionary) and https://www.knopflerfish.org/releases/current/docs/javadoc/org/osgi/framework/BundleContext.html#getServiceReferences(java.lang.Class,%20java.lang.String)

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Consul demo (self-registration)

See infra/docker-compose.yml + self/*

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Consul demo (3rd-party-registration, k8s)

TODO: small demo

See https://github.com/hashicorp/consul-k8s/blob/main/control-plane/connect-inject/container_init.go

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Additional reading

• https://quarkus.io/guides/stork
• https://learn.hashicorp.com/tutorials/consul/kubernetes-minikube?in=consul/kubernetes
• https://github.com/Ecwid/consul-api

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Consul REST API

• http://localhost:8500/v1/catalog/services
• http://localhost:8500/v1/health/service/consul?pretty

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Snippets

kubectl config view --raw > ~/.kube/config
helm install --values helm-consul-values.yaml consul hashicorp/consul --create-namespace --namespace consul --version "0.43.0"
kubectl exec --stdin --tty consul-server-0 --namespace consul -- /bin/sh
kubectl run color-producer-red --image=bratuhia/color-producer:1.0.0 --env="CONSUL_ENABLED=false" --env="APP_COLOR=red" --dry-run=client -o yaml

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