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$ mkdir manifests
$ cd manifests
$ kubectl apply -f ./

deployment.apps/backend created
service/backend created
deployment.apps/frontend created
service/frontend created
$ kubectl get deployment,service --selector app=frontend

NAME                       READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/frontend   1/1     1            1           1s

NAME               TYPE           CLUSTER-IP      EXTERNAL-IP ...
service/frontend   LoadBalancer   10.98.221.236   127.0.0.1   ...
$ kubectl get deployment,service --selector app=backend

NAME                      READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/backend   1/1     1            1           1s

NAME              TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)   AGE
service/backend   ClusterIP   10.96.38.122   <none>        80/TCP    1s
$ kubectl apply -f frontend-deployment.yaml

deployment.apps/frontend configured
$ kubectl rollout status --watch deploy/frontend

Waiting for deployment "frontend" rollout to finish...
deployment "frontend" successfully rolled out
$ kubectl apply -f backend-deployment.yaml

deployment.apps/backend configured
$ kubectl rollout status --watch deploy/backend

Waiting for deployment "backend" rollout to finish:
  1 old replicas are pending termination...
deployment "backend" successfully rolled out
$ kubectl exec consul-server-0 -n consul -- \
    curl -sS http://frontend.default:6060

curl: (52) Empty reply from server
command terminated with exit code 52
$ kubectl exec deploy/frontend -c frontend -- \
    curl -si http://backend/bird


HTTP/1.1 200 OK
...
$ sudo touch /etc/systemd/system/frontend.service
$ sudo touch /etc/systemd/system/backend.service
$ sudo systemctl enable frontend backend

Created symlink ...
Created symlink ...
$ sudo systemctl start frontend backend
$ sudo systemctl status frontend backend

  frontend.service - "Frontend service"
     Loaded: loaded...
     Active: active (running)...
...
  backend.service - "Backend service"
     Loaded: loaded...
     Active: active (running)...
$ sudo touch /etc/consul.d/frontend.hcl
$ sudo touch /etc/consul.d/backend.hcl
$ consul reload

Configuration reload triggered
$ consul catalog services

backend
backend-sidecar-proxy
consul
frontend
frontend-sidecar-proxy
consul connect envoy
$ sudo touch /etc/systemd/system/frontend-sidecar-proxy.service
$ sudo touch /etc/systemd/system/backend-sidecar-proxy.service
$ sudo systemctl enable frontend-sidecar-proxy
$ sudo systemctl enable backend-sidecar-proxy
$ sudo systemctl start frontend-sidecar-proxy
$ sudo systemctl start backend-sidecar-proxy
$ sudo systemctl status frontend-sidecar-proxy

 frontend-sidecar-proxy.service - "Frontend sidecar proxy service"
     Loaded: loaded...
     Active: active (running)...
$ sudo systemctl status backend-sidecar-proxy

 backend-sidecar-proxy.service - "Backend sidecar proxy service"
     Loaded: loaded...
     Active: active (running)...
$ sudo systemctl daemon-reload
$ sudo systemctl restart frontend