istio-ballerina-service-rollout

Following instructions are tested in Ubuntu 18.04. You should be able to skip certain steps, if you have them installed already.

install docker

sudo apt-get update
sudo apt install docker.io
sudo systemctl start docker
sudo systemctl enable docker

install kubectl

curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
chmod +x ./kubectl
sudo mv ./kubectl /usr/local/bin/kubectl
sudo su
kubectl version

eg:

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.0", GitCommit:"e8462b5b5dc2584fdcd18e6bcfe9f1e4d970a529", GitTreeState:"clean", BuildDate:"2019-06-19T16:40:16Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"linux/amd64"}
The connection to the server localhost:8080 was refused - did you specify the right host or port?

NOTE: k8s server will be installed in next step.

install minikube

curl -Lo minikube https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64   && chmod +x minikube
sudo cp minikube /usr/local/bin && rm minikube
minikube start --memory=6000 --cpus=4 --vm-driver=none
kubectl version 

eg:

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.0", GitCommit:"e8462b5b5dc2584fdcd18e6bcfe9f1e4d970a529", GitTreeState:"clean", BuildDate:"2019-06-19T16:40:16Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.3", GitCommit:"5e53fd6bc17c0dec8434817e69b04a25d8ae0ff0", GitTreeState:"clean", BuildDate:"2019-06-06T01:36:19Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"linux/amd64"}

$ kubectl get pods -n kube-system
NAME                               READY   STATUS             RESTARTS   AGE
coredns-fb8b8dccf-gjz8v            0/1     CrashLoopBackOff   5          5m49s
coredns-fb8b8dccf-jcg4j            0/1     CrashLoopBackOff   5          5m49s
etcd-minikube                      1/1     Running            0          4m45s
kube-addon-manager-minikube        1/1     Running            0          5m59s
kube-apiserver-minikube            1/1     Running            0          5m3s
kube-controller-manager-minikube   1/1     Running            0          4m38s
kube-proxy-z5rtw                   1/1     Running            0          5m49s
kube-scheduler-minikube            1/1     Running            0          4m41s
storage-provisioner                1/1     Running            0          5m48s

NOTE: that the coredns pods are not starting up properly due to the loop crash issue

Fix loop crash of coredns

(solve the issue with loop back crash: kubernetes/kubeadm#998 (comment))

kubectl -n kube-system edit configmap coredns
# comment the line containing "loop", save and exit (:x).
kubectl -n kube-system delete pod -l k8s-app=kube-dns

NOTE: now you shouldn't see the above error

# kubectl get pods -n kube-system
NAME                               READY   STATUS    RESTARTS   AGE
coredns-fb8b8dccf-h5d2t            1/1     Running   0          13s
coredns-fb8b8dccf-ljsc2            1/1     Running   0          13s
etcd-minikube                      1/1     Running   0          10m
kube-addon-manager-minikube        1/1     Running   0          11m
kube-apiserver-minikube            1/1     Running   0          10m
kube-controller-manager-minikube   1/1     Running   0          10m
kube-proxy-z5rtw                   1/1     Running   0          11m
kube-scheduler-minikube            1/1     Running   0          10m
storage-provisioner                1/1     Running   0          11m

install istio

curl -L https://git.io/getLatestIstio | ISTIO_VERSION=1.1.7 sh -
cd istio-1.1.7
export PATH=$PWD/bin:$PATH
for i in install/kubernetes/helm/istio-init/files/crd*yaml; do kubectl apply -f $i; done
kubectl apply -f install/kubernetes/istio-demo.yaml
kubectl get pods -n istio-system

# after a few minutes, you should see pods are either Running or completed.

$ kubectl get pods -n istio-system
NAME                                      READY   STATUS      RESTARTS   AGE
grafana-67c69bb567-clwkv                  1/1     Running     0          6m7s
istio-citadel-fc966574d-khs7f             1/1     Running     0          6m7s
istio-cleanup-secrets-1.1.7-sm7pj         0/1     Completed   0          6m8s
istio-egressgateway-6b4cd4d9f-n8x2f       1/1     Running     0          6m7s
istio-galley-cf776876f-x64dv              1/1     Running     0          6m7s
istio-grafana-post-install-1.1.7-drkxj    0/1     Completed   0          6m8s
istio-ingressgateway-59cc6ccbcb-gzbq5     1/1     Running     0          6m7s
istio-pilot-7b4dd9b748-zsk6h              2/2     Running     0          6m7s
istio-policy-5bcc859488-7cn4h             2/2     Running     5          6m7s
istio-security-post-install-1.1.7-5sb2l   0/1     Completed   0          6m8s
istio-sidecar-injector-c8ddbb99c-7jhbh    1/1     Running     0          6m6s
istio-telemetry-7678c9bb4d-n8gv9          2/2     Running     4          6m7s
istio-tracing-5d8f57c8ff-dq8sz            1/1     Running     0          6m6s
kiali-d4d886dd7-9wphp                     1/1     Running     0          6m7s
prometheus-d8d46c5b5-96smr                1/1     Running     0          6m7s

install open jdk

apt install openjdk-8-jre-headless
# add JAVA_HOME to the end of the ~/.bashrc file.
echo 'export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64' >> ~/.bashrc
source ~/.bashrc
echo $JAVA_HOME

install ballerina

cd /home/ubuntu
wget https://product-dist.ballerina.io/nightly/0.991.1-SNAPSHOT/ballerina-0.991.1-SNAPSHOT.zip
apt-get install zip
unzip -q ballerina-0.991.1-SNAPSHOT.zip
cd ballerina-0.991.1-SNAPSHOT 
echo  'export PATH=$PWD/bin:$PATH' >> ~/.bashrc
source ~/.bashrc
ballerina version 

install the sample

cd /home/ubuntu
git clone https://github.com/nirmal070125/istio-ballerina-service-rollout.git
cd istio-ballerina-service-rollout
ballerina build welcome-v1.bal
# verify the docker image was built
docker images |grep welcome 
kubectl label namespace default istio-injection=enabled
kubectl apply -f welcome.yaml 
kubectl get pods 
  NAME                         READY   STATUS    RESTARTS   AGE
  welcome-v1-bbbb87dc9-5tzb8   2/2     Running   0          98s
kubectl apply -f welcome-gateway.yaml
# IP of the k8s cluster
minikube ip 
kubectl get svc -n istio-system | grep istio-ingressgateway
  istio-ingressgateway     LoadBalancer   10.99.19.6       <pending>          15020:31775/TCP,80:31380/TCP,443:31390/TCP,31400:31400/TCP,15029:31958/TCP,15030:31214/TCP,15031:32565/TCP,15032:32240/TCP,15443:31331/TCP   119m

NOTE: if the external ip is "pending", use port as "31380", if there's an external IP assigned, use port as "80"

Open your browser and enter the url: http://<minikubeip or external ip>:<31380|80>/welcome/Chicago

Do a version rollout

# add subsets - available versions
kubectl apply -f welcome-svc-destination-rule.yaml 
# add the traffic routing rules
kubectl apply -f welcome-svc-virtual-service-100-0.yaml 
# deploy welcome v2
ballerina  build welcome-v2.bal 
kubectl apply -f welcome-add-v2.yaml
kubectl get pods
  NAME                          READY   STATUS    RESTARTS   AGE
  welcome-v1-bbbb87dc9-5tzb8    2/2     Running   0          20h
  welcome-v2-5cb946fdbf-9nccr   2/2     Running   0          6m59s
# route 20% of traffic to v2
kubectl apply -f welcome-svc-virtual-service-80-20.yaml

Open your browser and enter the url: http://<minikubeip or external ip>:<31380|80>/welcome/Chicago

You should see the v2 (WSO2 instead of WSO) appearing time to time.

Once you are satisfied with the v2, we'll set the traffic rules to route all the traffic to v2

kubectl apply -f welcome-svc-virtual-service-0-100.yaml 

Grafana dashboard

kubectl -n istio-system port-forward $(kubectl -n istio-system get pod -l app=grafana -o jsonpath='{.items[0].metadata.name}') 3000:3000 &

URL: http://localhost:3000/dashboard/db/istio-mesh-dashboard