Error creating: admission webhook "namespace.sidecar-injector.istio.io" denied the request: failed to run injection template: template: inject:212:12: executing "inject" at <.EstimatedConcurrency>: can't evaluate field EstimatedConcurrency in type *inject.SidecarTemplateData

 Problem:

Error creating: admission webhook "namespace.sidecar-injector.istio.io" denied the request: failed to run injection template: template: inject:212:12: executing "inject" at <.EstimatedConcurrency>: can't evaluate field EstimatedConcurrency in type *inject.SidecarTemplateData

Solution:

In vaulues.yaml, make below change:

pilot:

  # Can be a full hub/image:taggcr.io/istio-release

  image: gcr.io/istio-release/pilot:1.16.5

Kubernetes: kubectl config management.

 Config kubectl

Script to set current contexts:

clear

production="true"

[[ $0 != $BASH_SOURCE ]] && contextName=$BASH_SOURCE || contextName=$0

contextName=${contextName##*/}

export KUBECONFIG=~/.kube/config.${contextName}

kubectl config use-context ${contextName}

#starts 38;5; for the foreground and 48;5; for the background, then the color number

if [ $production == "true" ]; then

  export PS1="\e[38;5;016;0;48;5;166m\u@\H:\w - \e[5m$contextName\e[25m $ "

else

  export PS1="\e[38;5;012;48;5;015m\u@\H:\w - $contextName $ "

fi

  

kubectl config get-contexts

Kubernetes Pod Readiness Probe

Readiness Probe: 

1. httpGet 

readinessProbe:

  httpGet:

    path: /api/ready

    port: 8080

2. tcpSocket:

readinessProbe:
  topSocket:
    port:3306

3. command

readinessProbe:

  exec:

    command:

       - cat

      -/app/is_ready

Liveness Probe:

 1. httpGet 

livenessProbe:
  httpGet:
    path: /api/ready
    port: 8080 
  initialDelaySeconds: 10 
  periodSeconds: 5 
  failureThreshold: 8 

 

 

2. tcpSocket:

livenessProbe:
  topSocket:
    port:3306

3. command

livenessProbe:

  exec:

    command:

       - cat

      -/app/is_ready

 

Kubectl Cheatsheet

$ kubectl get svc --all-namespaces  | awk '{{gsub(/,/, ";", $6)}; a = ""; for (i = 1 ; i <= NF -1 ; i++) a = a $i "," ; print substr(a, 1, length(a)-1)}'