Tips
Some tips and tricks that you might find handy
You have two containers in a pod
oc get pods -o jsonpath="{.items[*].spec.containers[*].name}" -l app=customer -n tutorial
or
kubectl get pods -o jsonpath="{.items[*].spec.containers[*].name}" -l app=customer -n tutorialFrom these images
oc get pods -o jsonpath="{.items[*].spec.containers[*].image}" -l app=customer -n tutorial
or
kubectl get pods -o jsonpath="{.items[*].spec.containers[*].image}" -l app=customer -n tutorialGet the pod ids
CPOD=$(oc get pods -o jsonpath='{.items[*].metadata.name}' -l app=customer -n tutorial)
PPOD=$(oc get pods -o jsonpath='{.items[*].metadata.name}' -l app=preference -n tutorial)
RPOD1=$(oc get pods -o jsonpath='{.items[*].metadata.name}' -l app=recommendation,version=v1 -n tutorial)
RPOD2=$(oc get pods -o jsonpath='{.items[*].metadata.name}' -l app=recommendation,version=v2 -n tutorial)
or
CPOD=$(kubectl get pods -o jsonpath='{.items[*].metadata.name}' -l app=customer -n tutorial)
PPOD=$(kubectl get pods -o jsonpath='{.items[*].metadata.name}' -l app=preference -n tutorial)
RPOD1=$(kubectl get pods -o jsonpath='{.items[*].metadata.name}' -l app=recommendation,version=v1 -n tutorial)
RPOD2=$(kubectl get pods -o jsonpath='{.items[*].metadata.name}' -l app=recommendation,version=v2 -n tutorial)The pods all see each other’s services
oc exec $CPOD -c customer -n tutorial curl http://preference:8080
oc exec $CPOD -c customer -n tutorial curl http://recommendation:8080
oc exec $RPOD2 -c recommendation -n tutorial curl http://customer:8080
or
kubectl exec $CPOD -c customer -n tutorial curl http://preference:8080
kubectl exec $CPOD -c customer -n tutorial curl http://recommendation:8080
kubectl exec $RPOD2 -c recommendation -n tutorial curl http://customer:8080oc exec $CPOD -c customer -n tutorial curl http://localhost:15000/config_dump > afile.json
or
kubectl exec $CPOD -c customer -n tutorial curl http://localhost:15000/config_dump > afile.jsonLook for route_config, containing "name": "8080" and you should see entries for customer, preference and recommendation
"virtualHosts": [
{
"name": "customer.tutorial.svc.cluster.local:8080",
"domains": [
"customer.tutorial.svc.cluster.local",
"customer.tutorial.svc.cluster.local:8080",
"customer",
"customer:8080",
"customer.tutorial.svc.cluster",
"customer.tutorial.svc.cluster:8080",
"customer.tutorial.svc",
"customer.tutorial.svc:8080",
"customer.tutorial",
"customer.tutorial:8080",
"172.30.107.115",
"172.30.107.115:8080"
],
"routes": [
{
"match": {
"prefix": "/"
},
"route": {
"cluster": "outbound|8080||customer.tutorial.svc.cluster.local"
},
"decorator": {
"operation": "default-route"
}
}
]
},
{
"name": "istio-pilot.istio-system.svc.cluster.local:8080",
"domains": [
"istio-pilot.istio-system.svc.cluster.local",
"istio-pilot.istio-system.svc.cluster.local:8080",
"istio-pilot.istio-system",
"istio-pilot.istio-system:8080",
"istio-pilot.istio-system.svc.cluster",
"istio-pilot.istio-system.svc.cluster:8080",
"istio-pilot.istio-system.svc",
"istio-pilot.istio-system.svc:8080",
"172.30.142.41",
"172.30.142.41:8080"
],
"routes": [
{
"match": {
"prefix": "/"
},
"route": {
"cluster": "outbound|8080||istio-pilot.istio-system.svc.cluster.local"
},
"decorator": {
"operation": "default-route"
}
}
]
},
{
"name": "preference.tutorial.svc.cluster.local:8080",
"domains": [
"preference.tutorial.svc.cluster.local",
"preference.tutorial.svc.cluster.local:8080",
"preference",
"preference:8080",
"preference.tutorial.svc.cluster",
"preference.tutorial.svc.cluster:8080",
"preference.tutorial.svc",
"preference.tutorial.svc:8080",
"preference.tutorial",
"preference.tutorial:8080",
"172.30.26.194",
"172.30.26.194:8080"
],
"routes": [
{
"match": {
"prefix": "/"
},
"route": {
"cluster": "outbound|8080||preference.tutorial.svc.cluster.local"
},
"decorator": {
"operation": "default-route"
}
}
]
},
{
"name": "recommendation.tutorial.svc.cluster.local:8080",
"domains": [
"recommendation.tutorial.svc.cluster.local",
"recommendation.tutorial.svc.cluster.local:8080",
"recommendation",
"recommendation:8080",
"recommendation.tutorial.svc.cluster",
"recommendation.tutorial.svc.cluster:8080",
"recommendation.tutorial.svc",
"recommendation.tutorial.svc:8080",
"recommendation.tutorial",
"recommendation.tutorial:8080",
"172.30.103.127",
"172.30.103.127:8080"
],
"routes": [
{
"match": {
"prefix": "/"
},
"route": {
"cluster": "outbound|8080||recommendation.tutorial.svc.cluster.local"
},
"decorator": {
"operation": "default-route"
}
}
]
}
],Now add a new destinationrule and virtualservice.
istioctl create -f istiofiles/destination-rule-recommendation-v1-v2.yml
istioctl create -f istiofiles/virtual-service-recommendation-v2.ymlThe review the routes again
oc exec $CPOD -c customer -n tutorial curl http://localhost:15000/config_dump > bfile.json
or
kubectl exec $CPOD -c customer -n tutorial curl http://localhost:15000/config_dump > bfile.jsonHere is the Before:
"route": {
"cluster": "out.recommendation.springistio.svc.cluster.local|http",
"timeout": "0s"
},and
"decorator": {
"operation": "default-route"
}And the After:
"route": {
"cluster": "outbound|8080|version-v2|recommendation.tutorial.svc.cluster.local",
},and
"decorator": {
"operation": "recommendation"
}If you need the Pod IP
oc get pods -o jsonpath='{.items[*].status.podIP}' -l app=customer -n tutorial
or
kubectl get pods -o jsonpath='{.items[*].status.podIP}' -l app=customer -n tutorialDive into the istio-proxy container
oc exec -it $CPOD -c istio-proxy -n tutorial /bin/bash
or
kubectl exec -it $CPOD -c istio-proxy -n tutorial /bin/bash
cd /etc/istio/proxy
ls
cat envoy-rev0.jsonSnowdrop Troubleshooting