Kubernetes istio istioctl

Get Istio

curl -L https://istio.io/downloadIstio | sh -

curl -L https://istio.io/downloadIstio | ISTIO_VERSION=1.13.0 sh -
cd istio-1.13.0
./bin/istioctl version
# add to path istioctl
istioctl x precheck

Installing & Configuration Profiles

istioctl install --set profile=demo
istioctl install --set profile=default
istioctl install --set profile=demo -y

kubectl get pod -n istio-system
istioctl verify-install

Customizing configs

istioctl profile dump default  # show settings

istioctl install --set addonComponents.kiali.enabled=true \ 
--set components.telemetry.enabled=true \ 
--set components.citadel.enabled=true \ 
--set values.global.proxy.privileged=true \ 
--set addonComponents.tracing.enabled=true \ 
--set values.pilot.traceSampling=100.0 \ 
--set values.global.proxy.tracer=datadog

While changing any config, make sure to pass all the previous flags with the new ones. Failing to add any previously enabled variable will revert the config to its default values. One way to store the dump in a file and do istioctl apply or use helm charts for Istio.

Install the control-plane supporting components

kubectl apply -f ./samples/addons
kubectl get pod -n istio-system

Manual inject the Istio service proxy so that service can participate in the service mesh

istioctl kube-inject -f services/catalog/kubernetes/catalog.yaml

The istioctl kube-inject command takes a Kubernetes resource file and enriches it with the sidecar deployment of the Istio service proxy and a few additional components The YAML now includes a few extra containers as part of the deployment.

- args:
- proxy
- sidecar
- --domain
- $(POD_NAMESPACE).svc.cluster.local
- --serviceCluster
- catalog.$(POD_NAMESPACE)
- --proxyLogLevel=warning
- --proxyComponentLogLevel=misc:error
- --trust-domain=cluster.local
- --concurrency
- "2"
env:
- name: JWT_POLICY
value: first-party-jwt
- name: PILOT_CERT_PROVIDER
value: istiod
- name: CA_ADDR
value: istiod.istio-system.svc:15012
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
...
image: docker.io/istio/proxyv2:{1.13.0}
imagePullPolicy: Always
name: istio-proxy

Sidecar injection - Automatic

To enable sidecar, we have to add labels at the namespace level.

kubectl label namespace dsl-test istio-injection=enabled
kubectl label namespace istioinaction istio-injection=enabled

For services, which do not require sidecar, we need to add the following annotation in the deployment template:

# Pod Annotations 
podAnnotations: 
	sidecar.istio.io/inject: "false"

$ istioctl proxy-status  # overview of your mesh

istioctl proxy-config routes