Kubernetes allows you to create a service without selector, and cluster will not create related endpoint for this service, this feature is usually used to proxy a legacy component or an outside component. Create a service without selector apiVersion: v1 kind: Service metadata: name: my-service spec: ports: – protocol: TCP port: 1443 targetPort: <YOUR_MYSQL_PORT> Create … Read more
CHECK WITHOUT METRICS SERVER or ANY THIRD PARTY TOOL If you want to check pods cpu/memory usage without installing any third party tool then you can get memory and cpu usage of pod from cgroup. Go to pod’s exec mode kubectl exec -it pod_name -n namespace — /bin/bash Run cat /sys/fs/cgroup/cpu/cpuacct.usage for cpu usage Run … Read more
If you consider a project like hseeberger/constructr and its issue 179, a native Akka solution should be based on akka/akka-management: This repository contains interfaces to inspect, interact and manage various Parts of Akka, primarily Akka Cluster. Future additions may extend these concepts to other parts of Akka. There is a demo for kubernetes.
I thought about was having the container query the kubernetes/AWS API to fetch this information however that would mean adding quite a lot of complexity to my containers. This is currently the recommended approach for getting information not available in the downward API. To avoid the additional complexity in your containers, you could use a … Read more
I’m using ubuntu with Minikube and my database runs outside of minikube inside a docker container and can be accessed from localhost @ 172.17.0.2. My Kubernetes service for my external mysql container reads as follows: kind: Service apiVersion: v1 metadata: name: mysql-db-svc namespace: external spec: type: ExternalName externalName: 10.0.2.2 Then inside my .env for a … Read more
You could do it via the REST API using the PATCH verb. However, an easier way is to use kubectl patch. The following command updates your app’s tag: kubectl patch deployment myapp-deployment -p \ ‘{“spec”:{“template”:{“spec”:{“containers”:[{“name”:”myapp”,”image”:”172.20.34.206:5000/myapp:img:3.0″}]}}}}’ According to the documentation, YAML format should be accepted as well. See Kubernetes issue #458 though (and in particular this … Read more
Do this: export KUBECONFIG=~/.kube/config:~/someotherconfig kubectl config view –flatten You can then pipe that out to a new file if needed.
You can use the ‘describe pod‘ syntax For OpenShift use: oc describe pod <pod-id> For vanilla Kubernetes: kubectl describe pod <pod-id> Examine the events of the output. In my case it shows Back-off pulling image unreachableserver/nginx:1.14.22222 In this case the image unreachableserver/nginx:1.14.22222 can not be pulled from the Internet because there is no Docker registry … Read more
There is a way to pre-bind PVs to PVCs today, here is an example showing how: Create a PV object with a ClaimRef field referencing a PVC that you will subsequently create: $ kubectl create -f pv.yaml persistentvolume “pv0003” created where pv.yaml contains: apiVersion: v1 kind: PersistentVolume metadata: name: pv0003 spec: storageClassName: “” capacity: storage: … Read more
One option is to tell kubectl that you don’t want the certificate to be validated. Obviously this brings up security issues but I guess you are only testing so here you go: kubectl –insecure-skip-tls-verify –context=employee-context get pods The better option is to fix the certificate. Easiest if you reinitialize the cluster by running kubeadm reset … Read more