In certain situations (see details below), the deployment to Kubernetes fails with:
> "The Deployment [DEPLOYMENT_OBJECT] is invalid: [...] `selector` does not match template `labels`".
This is caused by the K8S Deployment manifests missing an explicit `selector` value.
This commit:
* adds explicit `selector` values for all Deployment objects.
* bumps the K8S API from the deprecated `extensions/v1beta1` version to the stable `apps/v1` version. This version made the `selector` property of the Deployment a required value, preventing any issues with missing selectors in the future.
This change is backwards compatible with existing deployments of the microservices demo app. I.e. you should be able to pull this change and run `skaffold run` against an existing deployment of the app without issues.
This will not however resolve the issue for existing deployments. Selectors are immutable and will therefore retain their current defaulted value. You should run `skaffold delete` followed by `skaffold run` after having pulled this change to do a clean re-deployment of the app, which will resolve the issue.
**The nitty-gritty details**
In the `extensions/v1beta1` version of K8S API (the version that was used by this project), the `selector` property of a Deployment object is optional and is defaulted to the labels used in the pod template. This can cause subtle issues leading to deployment failures. This project, where Deployment selectors were omitted, is a good example of what can go wrong with defaulted selectors.
Consider this:
1. Run `skaffold run` to build locally with Docker and deploy.
Since the Deployment specs don't have explict selectors, they will be defaulted to the pod template labels. And since skaffold adds additional labels to the pod template like `skaffold-builder` and `skaffold-deployer`, the end-result will be a selector that looks like this:
> app=cartservice,cleanup=true,docker-api-version=1.39,skaffold-builder=local,skaffold-deployer=kubectl,skaffold-tag-policy=git-commit,tail=true
So far, so good.
2. Now run `skaffold run -p gcb --default-repo=your-gcr-repo` to build on Google Cloud Build instead of building locally.
This will blow up when attempting to deploy to Kubernetes with an error similar to:
> The Deployment "cartservice" is invalid: spec.template.metadata.labels: Invalid value: map[string]string{"skaffold-builder":"google-cloud-build", "profiles"="gcb", "skaffold-deployer":"kubectl", "skaffold-tag-policy":"git-commit", "docker-api-version":"1.39", "tail":"true", "app":"cartservice", "cleanup":"true"}: `selector` does not match template `labels`
(and the same error for every other deployment object)
This is because the skaffold labels that were automatically added to the pod template have changed to include references to Google Cloud Build. That normally shouldn't be an issue.
But without explicit Deployment selectors, this results in the defaulted selectors for our Deployment objects to have also changed. Which means that the new version of our Deployment objects are now managing different sets of Pods. Which is thankfully caught by kubectl before the deployment happens (otherwise this would have resulted in orphaned pods).
In this commit, we explicitely set the `selector` value of all Deployment objects, which fixes this issue. We also bump the K8S API version to the stable `apps/v1`, which makes the `selector` property a required value and will avoid accidently forgetting selectors in the future.
More details if you're curious:
* Why defaulted Deployment selectors cause problems: https://github.com/kubernetes/kubernetes/issues/26202
* Why Deployment selectors should be (and were made) immutable: https://github.com/kubernetes/kubernetes/issues/50808
This is the first service that exports to jaeger. Others to follow.
Requires jaeger to be instantiated using
- helm install --name jaeger stable/jaeger-operator
- kubectl apply -f jaeger.yaml
=== jaeger.yaml Content ===
apiVersion: io.jaegertracing/v1alpha1
kind: Jaeger
metadata:
name: jaeger
Above steps will be added to README in subsequent PR.
This removes hardcoded GCP project name from images and requires an explicit repository flag to skaffold. Also updating the cloudbuild.yaml for staging with the gcr.io/k8s-skaffold/skaffold image.
Fixes#17.
adservice has beeing OOMkill'ed over the weekend. it looks like the memory
goes up to ~130MiB and then gets killed.
Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>
* Initial commit for Ads Service.
* update comments for AdsService and AdsServiceClient
* Refactor Ads to Ad
Move building AdService to Docker
Use default setting for Stackdriver Exporter.
Add license text.
* Revert the projectId
- also remove commented code from frontend/rpc.go
* Add adservie to skaffold.yaml
* Remove skaffold-adservice.yaml
* Replace personal projectId with demo projectId.
* Fix the crash in adservice when ran in locally.
* Ignore .skaffold*yaml file and .kubernetes-manifests-*/ dir for easy ProjectID switch.
* Fixed review comments.
1. Changed Ad redirect urls to products.
2. Removed leftovers from Dockerfile/kub*manifests*yaml
3. Added retry for StackDriver.
4. Added log for Ad request.
5. Added comment for gradle caching.
6. Added README.md to src/adservice.
* Added GRPC Health service to Ad Service
Also added
1. timeout to getAd RPC call in frontend.
2. Async thread for stackdriver init.
