Facing issue with istio 1.1.3 installation

Istio pilot , policy , telemetry is getting crashed again and again.

Istio pilot ->
[root@svpod7mgmt002 istio-1.1.3]# kubectl describe pods istio-pilot-57b4cb94d4-4jmkg -n istio-system
Warning Unhealthy 10m kubelet, bay7 Readiness probe failed: Get net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Last State: Terminated
Reason: OOMKilled

dicscovery -> i am getting TCP connection refused error , but container state is showing as runnning

Policy -> info grpc: addrConn.createTransport failed to connect to {istio-galley.istio-system.svc:9901 0 }. Err :connection error: desc = “transport: Error while dialing dial tcp connect: connection refused”. Reconnecting.

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