You want to get a field from a kubernetes configmap using json but the name contains a dot (ie ca.crt)
You can use the following (escaping the dot)
kubectl get configmap <configmap> o jsonpath='{.data.ca\.crt}’
Upgrading Grafana (kube-prometheus-stack) from version 23.1 to the latest one currently 44.2.1 results in many Grafana graphs to disappear from the existing dashboards.
Since editing the actual graphs and trying to use ‘Run queries’ does not seem to work, a work around is the following:
Since the documentation does not contain any information about how you can connect an existing application to the newly created percona pgo cluster, you can use something like the following in your pod postgresql connection string.
postgresql://username:password@cluster1.pgo-perc-production.svc.cluster.local/production
where cluster1.pgo-perc-production.svc.cluster.local points to your newly created cluster and the /production is the database to connect to.
Trying to create an auto-cluster either using terraform or gcloud cli, and specifying the region name returns the error that ‘Autopilot clusters must be regional clusters.
So with gcloud this is the command and output
kosmas: (master %)$ gcloud container clusters create-auto test-cluster --region=europe-west6-b Note: The Pod address range limits the maximum size of the cluster. Please refer to https://cloud.google.com/kubernetes-engine/docs/how-to/flexible-pod-cidr to learn how to optimize IP address allocation. ERROR: (gcloud.container.clusters.create-auto) ResponseError: code=400, message=Autopilot clusters must be regional clusters.
Using the actual region name (that can be taken from the list of available zones/regions)
gcloud compute zones list NAME REGION STATUS NEXT_MAINTENANCE TURNDOWN_DATE us-east1-b us-east1 UP us-east1-c us-east1 UP ... europe-west6-b europe-west6 UP ...
And using the correct region name (without the b)
gcloud container clusters create-auto test-cluster --region=europe-west6 --verbosity debug ... Created [https://container.googleapis.com/v1/projects/gitlab-runner-343714/zones/europe-west6/clusters/test-cluster]. ... NAME LOCATION MASTER_VERSION MASTER_IP MACHINE_TYPE NODE_VERSION NUM_NODES STATUS test-cluster europe-west6 1.21.6-gke.1503 xxx.xxx.xxx.xxx e2-medium 1.21.6-gke.1503 3 RUNNING
When you have two pods with different labels, let’s say one with two labels a=something and b=other, and the second one with label b=other, when you use kubectl to get them there is a difference in the way that the -l selector is used.
So using kubectl -n namespace get pods -l a=something -l b=other it will give you back both pods as it works as an OR operator.
If you wanted to get only the first one that has both labels, but not the second, you would need to use it as in kubectl -n namespace get pods -l a=something,b=other.
In other words the comma separator acts as a logical AND operator in selecting the labels.
To show all events on a specific kubernetes namespace ordered by date use the following:
kubectl -n namespace_name get events --sort-by='.metadata.creationTimestamp'
To get or set in environment variables the platform information of a system you can use the following:
export ARCH=$(case $(arch) in x86_64) echo -n amd64 ;; aarch64) echo -n arm64 ;; *) echo -n $(arch) ;; esac)
export OS=$(uname | awk '{print tolower($0)}')Taken from the installation instructions of the Operator SKD here: https://master.sdk.operatorframework.io/docs/installation/
You are trying to set up kubernetes on your local machine but trying to use initialize it with kubeadmin init, returns the following error:
[init] Using Kubernetes version: v1.18.3
[preflight] Running pre-flight checks
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR Swap]: running with swap on is not supported. Please disable swap
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
To see the stack trace of this error execute with --v=5 or higher
Switch the swap to off (Ubuntu command below) and try again.
sudo swapoff -a
You would like to follow the example for working with skaffold by using the skaffold dev command but you are getting the following error:
kosmas:getting-started (master)$ skaffold dev
WARN[0000] Your Skaffold version might be too old. Download the latest version (1.0.1) at https://storage.googleapis.com/skaffold/releases/latest/skaffold-linux-amd64 Download the latest release from here https://github.com/GoogleContainerTools/skaffold/releases and follow the instructions for installing it in your system (ie linux):
curl -Lo skaffold https://storage.googleapis.com/skaffold/releases/v1.0.1/skaffold-linux-amd64 && chmod +x skaffold && sudo mv skaffold /usr/local/binYou get the following error when trying to start minikube:
Error setting up kubeconfig: writing kubeconfig: Error writing file : open : no such file or directory
Unset the KUBECONFIG variable like:
unset KUBECONFIG