kubernetes-operators-book / chapters Goto Github PK

go.mod file is missing in ch07 which makes provided operator undeployable.

The environment variable MYSQL_SERVICE_PORT has the value tcp:<ip>:3306 so the init script crashes when the app starts.
As a workaround, setting the environment variable fixes the problem.

ch05 uses deployment yaml files to deploy the sample application. To enable ingress, the files expose services as Nodeport.

This makes it quite difficult to reach the service in a multi-node OCP cluster. You have to:

1. Check where did the frontend pod get deployed (which node)
2. Check the IP address of the node
3. enable access to the port on the node
4. GET that particular ip:port

The Ingress resource makes this much easier by adding a resolvable hostname. Ingress should work on both minikube and codeready containers, with the added benefit of working on multi-node clusters.

Hello,

I'm following the tutorial on chapter 3 from this excellent book.

While creating the etcd-operator deployment, I got the following error with the associated image:

5s          Normal    Pulling             pod/etcd-operator-6dbbb9565d-htpwq    Pulling image "quay.io/coreos/etcd-operator:v0.9.4"
19s         Warning   Failed              pod/etcd-operator-6dbbb9565d-htpwq    Failed to pull image "quay.io/coreos/etcd-operator:v0.9.4": [DEPRECATION NOTICE] Docker Image Format v1 and Docker Image manifest version 2, schema 1 support is disabled by default and will be removed in an upcoming release. Suggest the author of quay.io/coreos/etcd-operator:v0.9.4 to upgrade the image to the OCI Format or Docker Image manifest v2, schema 2. More information at https://docs.docker.com/go/deprecated-image-specs/
19s         Warning   Failed              pod/etcd-operator-6dbbb9565d-htpwq    Error: ErrImagePull
19s         Normal    BackOff             pod/etcd-operator-6dbbb9565d-htpwq    Back-off pulling image "quay.io/coreos/etcd-operator:v0.9.4"
19s         Warning   Failed              pod/etcd-operator-6dbbb9565d-htpwq    Error: ImagePullBackOff

Any advice on this?

Thanks in advance.

Regards,

Fred Fadda

upon running oc create -f etcd-cluster-cr.yaml the example-etcd-cluster-* pods are not created

Create Etcdcluster in this branch, to fix the #10 issue, check-dns the init container of the etcd intance pod is fail:

$ k create -f etcd-operator-deployment.yaml

$ k logs -f example-etcd-cluster-9cwsm2n8g7 check-dns
nslookup: can't resolve 'example-etcd-cluster-9cwsm2n8g7.example-etcd-cluster.default.svc'
^VServer:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

(...repeating...)

It seems querying to pod(itself?) but like <pod-name>.<service-name>.<ns>.svc(?).
The rule of Pod DNS is pod-ip-address.my-namespace.pod.cluster-domain.example or pod-ip-address.service-name.my-namespace.svc.cluster-domain.example

Hello!

trying to run example in page #14 of the book, executed the command

$ kubectl create -f etcd-operator-crd.yaml

and got the error:

error: unable to recognize "etcd-operator-crd.yaml": no matches for kind "CustomResourceDefinition" in version "apiextensions.k8s.io/v1beta1"

in kubernetes 1.22 "apiextensions.k8s.io/v1beta1" version was removed

https://kubernetes.io/blog/2021/07/14/upcoming-changes-in-kubernetes-1-22/#:~:text=The%20beta%20CustomResourceDefinition%20API%20(apiextensions.k8s.io/v1beta1)

tried to use kubectl convert to convert the manifest to a new version but also getting an error

$ kubectl convert -f etcd-operator-crd.yaml --output-version apiextensions.k8s.io/v1
error: unable to decode "etcd-operator-crd.yaml": no kind "CustomResourceDefinition" is registered for version "apiextensions.k8s.io/v1beta1" in scheme "pkg/api/legacyscheme/scheme.go:30"

any ideas? how to create the CRD in this cluster ?

this is my env:

macOS Monterrey
Version 12.3.1

$ oc version
Client Version: openshift-clients-4.5.0-202006231303.p0-21-g297a4ac42
Server Version: 4.10.9
Kubernetes Version: v1.23.5+9ce5071
$ oc whoami  
kubeadmin

thanks

Chapter-6: Adapter Operators | Running the Helm Operator

Command in the book

$ operator-sdk up local --watches-file ./local-watches.yaml

Updated Command

$ operator-sdk run --local --watches-file ./local-watches.yaml

what would be the license of this repository?

Are these imports correct?

https://github.com/kubernetes-operators-book/chapters/blob/master/ch07/visitors-operator/cmd/manager/main.go#L13-L14