######################
# Installing Flagger
######################

$ kubectl apply \
 --kustomize github.com/weaveworks/flagger/kustomize/istio

#####################
# Deploying The App
#####################

$ cd go-demo-7

$ kubectl create namespace go-demo-7

$ kubectl label namespace go-demo-7 \
 istio-injection=enabled

$ kubectl --namespace go-demo-7 apply \
 --filename k8s/istio/flagger-full/db \
 --recursive

$ kubectl --namespace go-demo-7 apply \
 --filename k8s/istio/flagger-full/app \
 --recursive

$ kubectl --namespace go-demo-7 \
 rollout status \
 deployment go-demo-7

$ kubectl --namespace go-demo-7 \
 rollout status \
 deployment go-demo-7-primary

$ kubectl --namespace go-demo-7 \
 get deployments

NAME                READY   UP-TO-DATE   AVAILABLE   AGE
go-demo-7           2/2     2            2           2m19s
go-demo-7-db        1/1     1            1           2m24s
go-demo-7-primary   2/2     2            2           23s

$ chmod +x k8s/istio/get-ingress-host.sh

$ INGRESS_HOST=$(\
 ./k8s/istio/get-ingress-host.sh \
 $PROVIDER)

$ echo ${INGRESS_HOST}

$ curl -H "Host: go-demo-7.acme.com" \
 "http://$INGRESS_HOST/version"

Version: 0.0.1; Release: unknown

##############
# The Script
##############

$ kubectl --namespace go-demo-7 \
 get canary go-demo-7 \
 --output yaml

$ kubectl --namespace go-demo-7 \
 get canary go-demo-7 \
 --output jsonpath="{.status.phase}"

$ cat k8s/istio/flagger-status.sh

$ chmod +x k8s/istio/flagger-status.sh

#####################
# Successful Canary
#####################

$ echo ${INGRESS_HOST}

# Open a second terminal session

$ export INGRESS_HOST=[...]

$ echo {INGRESS_HOST}

$ cd ~/go-demo-7

$ export ADDR="http://${INGRESS_HOST}/version"

$ ./k8s/istio/flagger-status.sh "$ADDR"

# Go back to the first terminal session

$ kubectl --namespace go-demo-7 apply \
 --filename k8s/istio/flagger/exercise/deployment-0-0-2.yaml

$ kubectl --namespace go-demo-7 \
 describe canary go-demo-7

# Go to the second terminal session

echo $?

# Go back to the first terminal session

# Wait for a while (e.g., 5 min.)

#################
# Failed Canary
#################

# Go to the second terminal session

$ export ADDR="http://$INGRESS_HOST/demo/random-error"

$ ./k8s/istio/flagger-status.sh "$ADDR"

# Go back to the first terminal session

$ kubectl --namespace go-demo-7 apply \
 --filename k8s/istio/flagger/exercise/deployment-0-0-3.yaml

$ kubectl --namespace go-demo-7 \
 describe canary go-demo-7

# Go to the second terminal session

$ echo $?

# Go back to the first terminal session

###############
# Cleaning Up
###############

$ cd ..

$ kubectl delete namespace go-demo-7