Tips

Some tips and tricks that you might find handy

You have two containers in a pod

  1. oc get pods -o jsonpath="{.items[*].spec.containers[*].name}" -l app=customer -n tutorial
  2. or
  3. kubectl get pods -o jsonpath="{.items[*].spec.containers[*].name}" -l app=customer -n tutorial

From these images

  1. oc get pods -o jsonpath="{.items[*].spec.containers[*].image}" -l app=customer -n tutorial
  2. or
  3. kubectl get pods -o jsonpath="{.items[*].spec.containers[*].image}" -l app=customer -n tutorial

Get the pod ids

  1. CPOD=$(oc get pods -o jsonpath='{.items[*].metadata.name}' -l app=customer -n tutorial)
  2. PPOD=$(oc get pods -o jsonpath='{.items[*].metadata.name}' -l app=preference -n tutorial)
  3. RPOD1=$(oc get pods -o jsonpath='{.items[*].metadata.name}' -l app=recommendation,version=v1 -n tutorial)
  4. RPOD2=$(oc get pods -o jsonpath='{.items[*].metadata.name}' -l app=recommendation,version=v2 -n tutorial)
  6. or
  8. CPOD=$(kubectl get pods -o jsonpath='{.items[*].metadata.name}' -l app=customer -n tutorial)
  9. PPOD=$(kubectl get pods -o jsonpath='{.items[*].metadata.name}' -l app=preference -n tutorial)
  10. RPOD1=$(kubectl get pods -o jsonpath='{.items[*].metadata.name}' -l app=recommendation,version=v1 -n tutorial)
  11. RPOD2=$(kubectl get pods -o jsonpath='{.items[*].metadata.name}' -l app=recommendation,version=v2 -n tutorial)

The pods all see each other’s services

  1. oc exec $CPOD -c customer -n tutorial curl http://preference:8080
  2. oc exec $CPOD -c customer -n tutorial curl http://recommendation:8080
  3. oc exec $RPOD2 -c recommendation -n tutorial curl http://customer:8080
  5. or
  7. kubectl exec $CPOD -c customer -n tutorial curl http://preference:8080
  8. kubectl exec $CPOD -c customer -n tutorial curl http://recommendation:8080
  9. kubectl exec $RPOD2 -c recommendation -n tutorial curl http://customer:8080
  1. oc exec $CPOD -c customer -n tutorial curl http://localhost:15000/config_dump > afile.json
  2. or
  3. kubectl exec $CPOD -c customer -n tutorial curl http://localhost:15000/config_dump > afile.json

Look for route_config, containing "name": "8080" and you should see entries for customer, preference and recommendation

  1. "virtualHosts": [
  2.       {
  3.        "name": "customer.tutorial.svc.cluster.local:8080",
  4.        "domains": [
  5.         "customer.tutorial.svc.cluster.local",
  6.         "customer.tutorial.svc.cluster.local:8080",
  7.         "customer",
  8.         "customer:8080",
  9.         "customer.tutorial.svc.cluster",
  10.         "customer.tutorial.svc.cluster:8080",
  11.         "customer.tutorial.svc",
  12.         "customer.tutorial.svc:8080",
  13.         "customer.tutorial",
  14.         "customer.tutorial:8080",
  15.         "172.30.107.115",
  16.         "172.30.107.115:8080"
  17.        ],
  18.        "routes": [
  19.         {
  20.          "match": {
  21.           "prefix": "/"
  22.          },
  23.          "route": {
  24.           "cluster": "outbound|8080||customer.tutorial.svc.cluster.local"
  25.          },
  26.          "decorator": {
  27.           "operation": "default-route"
  28.          }
  29.         }
  30.        ]
  31.       },
  32.       {
  33.        "name": "istio-pilot.istio-system.svc.cluster.local:8080",
  34.        "domains": [
  35.         "istio-pilot.istio-system.svc.cluster.local",
  36.         "istio-pilot.istio-system.svc.cluster.local:8080",
  37.         "istio-pilot.istio-system",
  38.         "istio-pilot.istio-system:8080",
  39.         "istio-pilot.istio-system.svc.cluster",
  40.         "istio-pilot.istio-system.svc.cluster:8080",
  41.         "istio-pilot.istio-system.svc",
  42.         "istio-pilot.istio-system.svc:8080",
  43.         "172.30.142.41",
  44.         "172.30.142.41:8080"
  45.        ],
  46.        "routes": [
  47.         {
  48.          "match": {
  49.           "prefix": "/"
  50.          },
  51.          "route": {
  52.           "cluster": "outbound|8080||istio-pilot.istio-system.svc.cluster.local"
  53.          },
  54.          "decorator": {
  55.           "operation": "default-route"
  56.          }
  57.         }
  58.        ]
  59.       },
  60.       {
  61.        "name": "preference.tutorial.svc.cluster.local:8080",
  62.        "domains": [
  63.         "preference.tutorial.svc.cluster.local",
  64.         "preference.tutorial.svc.cluster.local:8080",
  65.         "preference",
  66.         "preference:8080",
  67.         "preference.tutorial.svc.cluster",
  68.         "preference.tutorial.svc.cluster:8080",
  69.         "preference.tutorial.svc",
  70.         "preference.tutorial.svc:8080",
  71.         "preference.tutorial",
  72.         "preference.tutorial:8080",
  73.         "172.30.26.194",
  74.         "172.30.26.194:8080"
  75.        ],
  76.        "routes": [
  77.         {
  78.          "match": {
  79.           "prefix": "/"
  80.          },
  81.          "route": {
  82.           "cluster": "outbound|8080||preference.tutorial.svc.cluster.local"
  83.          },
  84.          "decorator": {
  85.           "operation": "default-route"
  86.          }
  87.         }
  88.        ]
  89.       },
  90.       {
  91.        "name": "recommendation.tutorial.svc.cluster.local:8080",
  92.        "domains": [
  93.         "recommendation.tutorial.svc.cluster.local",
  94.         "recommendation.tutorial.svc.cluster.local:8080",
  95.         "recommendation",
  96.         "recommendation:8080",
  97.         "recommendation.tutorial.svc.cluster",
  98.         "recommendation.tutorial.svc.cluster:8080",
  99.         "recommendation.tutorial.svc",
  100.         "recommendation.tutorial.svc:8080",
  101.         "recommendation.tutorial",
  102.         "recommendation.tutorial:8080",
  103.         "172.30.103.127",
  104.         "172.30.103.127:8080"
  105.        ],
  106.        "routes": [
  107.         {
  108.          "match": {
  109.           "prefix": "/"
  110.          },
  111.          "route": {
  112.           "cluster": "outbound|8080||recommendation.tutorial.svc.cluster.local"
  113.          },
  114.          "decorator": {
  115.           "operation": "default-route"
  116.          }
  117.         }
  118.        ]
  119.       }
  120.      ],

Now add a new destinationrule and virtualservice.

  1. istioctl create -f istiofiles/destination-rule-recommendation-v1-v2.yml
  2. istioctl create -f istiofiles/virtual-service-recommendation-v2.yml

The review the routes again

  1. oc exec $CPOD -c customer -n tutorial curl http://localhost:15000/config_dump > bfile.json
  2. or
  3. kubectl exec $CPOD -c customer -n tutorial curl http://localhost:15000/config_dump > bfile.json

Here is the Before:

  1.             "route": {
  2.                 "cluster": "out.recommendation.springistio.svc.cluster.local|http",
  3.                 "timeout": "0s"
  4.             },

and

  1.             "decorator": {
  2.                 "operation": "default-route"
  3.             }

And the After:

  1.             "route": {
  2.                   "cluster": "outbound|8080|version-v2|recommendation.tutorial.svc.cluster.local",
  3.               },

and

  1.             "decorator": {
  2.                   "operation": "recommendation"
  3.              }

If you need the Pod IP

  1. oc get pods -o jsonpath='{.items[*].status.podIP}' -l app=customer -n tutorial
  2. or
  3. kubectl get pods -o jsonpath='{.items[*].status.podIP}' -l app=customer -n tutorial

Dive into the istio-proxy container

  1. oc exec -it $CPOD -c istio-proxy -n tutorial /bin/bash
  2. or
  3. kubectl exec -it $CPOD -c istio-proxy -n tutorial /bin/bash
  5. cd /etc/istio/proxy
  6. ls
  7. cat envoy-rev0.json

Snowdrop Troubleshooting

https://github.com/snowdrop/spring-boot-quickstart-istio/blob/master/TROUBLESHOOT.md