Canary Deployments To Kubernetes Using Istio and Friends

Делаю:
21.01.2021

05 Running Canary Deployments Manually

https://gist.github.com/5aa9bb94fb9192b6865b7100534ea027

$ export GH_USER=vfarcic

$ cd ~

$ git clone \
 https://github.com/$GH_USER/go-demo-7.git

$ cd go-demo-7

################
# Fist Release
################

$ kubectl create namespace go-demo-7

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

$ kubectl --namespace go-demo-7 apply \
 --filename k8s/istio/gateway/ \
 --recursive

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

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

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

$ echo ${INGRESS_HOST}

$ for i in {1..10}; do
curl -H "Host: go-demo-7.acme.com" \
 "http://${INGRESS_HOST}/version"
done

response:

Version: 0.0.1; Release: unknown
Version: 0.0.1; Release: unknown
Version: 0.0.1; Release: unknown
Version: 0.0.1; Release: unknown
Version: 0.0.1; Release: unknown
Version: 0.0.1; Release: unknown
Version: 0.0.1; Release: unknown
Version: 0.0.1; Release: unknown
Version: 0.0.1; Release: unknown
Version: 0.0.1; Release: unknown

$ kubectl --namespace go-demo-7 get pods
NAME                                 READY   STATUS    RESTARTS   AGE
go-demo-7-db-dbd659775-r5khk         2/2     Running   0          9m3s
go-demo-7-primary-7cdff5b4f7-g9vs5   2/2     Running   2          9m3s
go-demo-7-primary-7cdff5b4f7-j9b8x   2/2     Running   2          9m3s
go-demo-7-primary-7cdff5b4f7-vpqx9   2/2     Running   2          9m3s

###############
# New Release
###############

$ cat k8s/istio/split/exercise/app-0-0-2-canary.yaml

$ diff k8s/istio/gateway/app/deployment.yaml \
 k8s/istio/split/exercise/app-0-0-2-canary.yaml

$ kubectl --namespace go-demo-7 apply \
 --filename k8s/istio/split/exercise/app-0-0-2-canary.yaml

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

$ kubectl --namespace go-demo-7 get pods
NAME                                 READY   STATUS    RESTARTS   AGE
go-demo-7-canary-5d77fff5fc-5bphr    2/2     Running   0          68s
go-demo-7-db-dbd659775-r5khk         2/2     Running   0          44m
go-demo-7-primary-7cdff5b4f7-g9vs5   2/2     Running   2          44m
go-demo-7-primary-7cdff5b4f7-j9b8x   2/2     Running   2          44m
go-demo-7-primary-7cdff5b4f7-vpqx9   2/2     Running   2          44m

$ kubectl --namespace go-demo-7 \
>  get deployments
NAME                READY   UP-TO-DATE   AVAILABLE   AGE
go-demo-7-canary    1/1     1            1           18m
go-demo-7-db        1/1     1            1           61m
go-demo-7-primary   3/3     3            3           61m

$ for i in {1..100}; do
curl -H "Host: go-demo-7.acme.com" \
 "http://${INGRESS_HOST}/version"
done

***
Version: 0.0.2; Release: unknown
Version: 0.0.1; Release: unknown
Version: 0.0.2; Release: unknown
Version: 0.0.1; Release: unknown
Version: 0.0.1; Release: unknown
***

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

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

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

#####################
# Splitting Traffic
#####################

$ cat k8s/istio/split/exercise/host20.yaml

$ kubectl --namespace go-demo-7 apply \
 --filename k8s/istio/split/exercise/host20.yaml

$ for i in {1..100}; do
curl -H "Host: go-demo-7.acme.com" \
 "http://${INGRESS_HOST}/version"
done

$ kubectl --namespace go-demo-7 delete \
 --filename k8s/istio/split/exercise/host20.yaml

Better aproach

$ cat k8s/istio/split/exercise/split20.yaml

# NOTE: The sum of all `weight` entries must be 100

$ kubectl --namespace go-demo-7 apply \
 --filename k8s/istio/split/exercise/split20.yaml

$ for i in {1..100}; do
curl -H "Host: go-demo-7.acme.com" \
 "http://$INGRESS_HOST/version"
done

###################
# Rolling Forward
###################

$ cat k8s/istio/split/exercise/split40.yaml

$ kubectl --namespace go-demo-7 apply \
 --filename k8s/istio/split/exercise/split40.yaml

$ for i in {1..100}; do
curl -H "Host: go-demo-7.acme.com" \
 "http://$INGRESS_HOST/version"
done

$ cat k8s/istio/split/exercise/split60.yaml

$ kubectl --namespace go-demo-7 apply \
 --filename k8s/istio/split/exercise/split60.yaml

$ for i in {1..100}; do
curl -H "Host: go-demo-7.acme.com" \
 "http://$INGRESS_HOST/version"
done

############################
# Finishing The Deployment
############################

$ cat k8s/istio/split/exercise/app-0-0-2.yaml

$ diff k8s/istio/gateway/app/deployment.yaml \
 k8s/istio/split/exercise/app-0-0-2.yaml

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

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

$ for i in {1..100}; do
curl -H "Host: go-demo-7.acme.com" \
 "http://$INGRESS_HOST/version"
done

Version: 0.0.2; Release: canary
Version: 0.0.2; Release: canary
Version: 0.0.2; Release: primary
Version: 0.0.2; Release: primary
Version: 0.0.2; Release: canary
Version: 0.0.2; Release: primary
Version: 0.0.2; Release: primary
Version: 0.0.2; Release: primary
Version: 0.0.2; Release: canary
Version: 0.0.2; Release: canary
Version: 0.0.2; Release: canary

$ cat k8s/istio/split/exercise/split100.yaml

$ kubectl --namespace go-demo-7 apply \
 --filename k8s/istio/split/exercise/split100.yaml

$ for i in {1..100}; do
curl -H "Host: go-demo-7.acme.com" \
 "http://$INGRESS_HOST/version"
done

***
Version: 0.0.2; Release: primary
Version: 0.0.2; Release: primary
Version: 0.0.2; Release: primary
Version: 0.0.2; Release: primary
***

$ kubectl --namespace go-demo-7 \
>  get deployments
NAME                READY   UP-TO-DATE   AVAILABLE   AGE
go-demo-7-canary    0/0     0            0           136m
go-demo-7-db        1/1     1            1           3h
go-demo-7-primary   3/3     3            3           3h