Verifying our installation is important to ensure that we have got everything right. To verify the installation of Istio, follow these steps:

1. First, check the version of istioctl and the different Istio modules:

$ istioctl version --short
client version: 1.3.5
citadel version: 1.3.5
egressgateway version: 1.3.5
galley version: 1.3.5
ingressgateway version: 1.3.5
pilot version: 1.3.5
policy version: 1.3.5
sidecar-injector version: 1.3.5
telemetry version: 1.3.5

2. The Istio resources are created in the istio-system namespace. Check the status of the Istio pods:

$ kubectl -n istio-system get pods
NAME                                    READY   STATUS     RESTARTS  AGE
grafana-c49f9df64-8q7gm                 1/1     Running    0         2m1s
istio-citadel-7f699dc8c8-flwc7          1/1     Running    0         113s
istio-cleanup-secrets-1.3.5-zvppz       0/1     Completed  0         2m4s
istio-egressgateway-54f556bc5c-j4rh8    1/1     Running    0         2m2s
istio-galley-687664875b-8n85n           1/1     Running    0         2m3s
istio-grafana-post-install-1.3.5-gfsfx  0/1     Completed  0         2m4s
istio-ingressgateway-688d5886d-vsd8k    1/1     Running    0         2m2s
...

The pods showing the status of Completed are the ones that ran a job successfully. All other pods should show the Running status.

Note from the preceding output that the Istio control plane consists of three components. They are as follows:

• Citadel: istio-citadel provides service-to-service and end-user authentication, with built-in identity and credential management.
• Mixer: Mixer consists of istio-policy, istio-telemetry, and istio-galley.
• Pilot: Pilot is istio-pilot.

Istio-ingressgateway and istio-egressgateway are platform-independent inbound and outbound traffic gateways. Prometheus, Kiali, and Grafana are backend services for metering and monitoring.