StackGres already has an implementation of Envoy, the sidecar injected by Istio (istio-proxy) it’s not compatible at the moment. In a k8s cluster with Istio installed you just only need to Annotate the StackGres cluster to avoid the sidecar injection from Istio.
Before you create a StackGres cluster make sure you add the annotation sidecar.istio.io/inject: 'false'
to the pods as is shown below:
apiVersion: stackgres.io/v1
kind: SGCluster
metadata:
namespace: gitlab-db
name: gitlab-db
spec:
metadata:
annotations:
pods:
sidecar.istio.io/inject: 'false'
postgresVersion: '12.3'
instances: 3
This will avoid your pods enter in a CrashLoopBackOff
state.