I've installed ArgoCD on my kubernetes cluster using
kubectl create namespace argocd
kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml
Now, how to remove it from the cluster totally?
You can delete the entire installation using this - kubectl delete -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml
Reference
I have followed instructions from this blog post to set up a k3s cluster on a couple of raspberry pi 4:
I'm now trying to get my hands dirty with traefik as front, but I'm having issues with the way it has been deployed as a 'HelmChart' I think.
From the k3s docs
It is also possible to deploy Helm charts. k3s supports a CRD
controller for installing charts. A YAML file specification can look
as following (example taken from
/var/lib/rancher/k3s/server/manifests/traefik.yaml):
So I have been starting up my k3s with the --no-deploy traefik option to manually add it with settings. So I therefore manually apply a yaml like this:
apiVersion: helm.cattle.io/v1
kind: HelmChart
metadata:
name: traefik
namespace: kube-system
spec:
chart: https://%{KUBERNETES_API}%/static/charts/traefik-1.64.0.tgz
set:
rbac.enabled: "true"
ssl.enabled: "true"
kubernetes.ingressEndpoint.useDefaultPublishedService: "true"
dashboard:
enabled: true
domain: "traefik.k3s1.local"
But when trying to iterate over settings to get it working as I want, I'm having trouble tearing it down. If I try kubectl delete -f on this yaml it just hangs indefinitely. And I can't seem to find a clean way to delete all the resources manually either.
I've been resorting now to just reinstall my entire cluster over and over because I can't seem to cleanup properly.
Is there a way to delete all the resources created by a chart like this without the helm cli (which I don't even have)?
Are you sure that kubectl delete -f is hanging?
I had the same issue as you and it seemed like kubectl delete -f was hanging, but it was really just taking a long time.
As far as I can tell, when you issue the kubectl delete -f a pod in the kube-system namespace with a name of helm-delete-* should spin up and try to delete the resources deployed via helm. You can get the full name of that container by running kubectl -n kube-system get pods, find the one with kube-delete-<name of yaml>-<id>. Then use the pod name to look at the logs using kubectl -n kube-system logs kube-delete-<name of yaml>-<id>.
An example of what I did was:
kubectl delete -f jenkins.yaml # seems to hang
kubectl -n kube-system get pods # look at pods in kube-system namespace
kubectl -n kube-system logs helm-delete-jenkins-wkjct # look at the delete logs
I see two options here:
Use the --now flag to delete your yaml file with minimal delay.
Use --grace-period=0 --force flags to force delete the resource.
There are other options but you'll need Helm CLI for them.
Please let me know if that helped.
I installed istio using these commands:
VERSION = 1.0.5
GCP = gcloud
K8S = kubectl
#$(K8S) apply -f istio-$(VERSION)/install/kubernetes/helm/istio/templates/crds.yaml
#$(K8S) apply -f istio-$(VERSION)/install/kubernetes/istio-demo-auth.yaml
#$(K8S) get pods -n istio-system
#$(K8S) label namespace default istio-injection=enabled
#$(K8S) get svc istio-ingressgateway -n istio-system
Now, how do I completely uninstall it including all containers/ingress/egress etc (everthing installed by istio-demo-auth.yaml?
Thanks.
If you used istioctl, it's pretty easy:
istioctl x uninstall --purge
Of course, it would be easier if that command were listed in istioctl --help...
Reference: https://istio.io/latest/docs/setup/install/istioctl/#uninstall-istio
Based on their documentation here, you can generate all specs as yml file then pipe it to simple kubectl's delete operation
istioctl manifest generate <your original installation options> | kubectl delete -f -
here's an example:
istioctl manifest generate --set profile=default | kubectl delete -f -
A drawback of this approach though is to remember all options you have used when you installed istio which might be quite hard to remember especially if you enabled specific components.
If you have installed istio using helm's chart, you can uninstall it easily
First, list all installed charts:
helm list -n istio-system
NAME NAMESPACE REVISION UPDATED STATUS
istiod istio-system 1 2020-03-07 15:01:56.141094 -0500 EST deployed
and then delete/uninstall the chart using the following syntax:
helm delete -n istio-system --purge istio-system
helm delete -n istio-system --purge istio-init
...
Check their website for more information on how to do this.
If you already installed istio using istioctl or helm in its own separate namespace, you can easily delete completely that namespace which will in turn delete all resources created inside it.
kubectl delete namespace istio-system
Just run kubectl delete for the files you applied.
kubectl delete -f istio-$(VERSION)/install/kubernetes/istio-demo-auth.yaml
You can find this in docs as well.
If you have installed it as described, then you will need to delete it in the same way.
kubectl delete -f istio-$(VERSION)/install/kubernetes/helm/istio/templates/crds.yaml
kubectl delete -f istio-$(VERSION)/install/kubernetes/istio-demo-auth.yaml
Then you would manually delete the folder, and istioctl, if you moved to anywhere.
IMPORTANT: Deleting a namespace is super comfortable to clean up, but you can't do it for all scenarios. In this situation, if you delete the namespace only, you are leaving all the permissions and credentials intact. Now, say you want to update Istio, and Istio team has made some security changes in their RBAC rules, but has not changed the name of the object. You would deploy the new yaml file, and it will throw an error saying the object (for example clusterrolebinding) already exists. If you don't pay attention to what that error was, you can end up with the worse type of errors (when there are no error, but something goes wrong).
Cleaning up Istio is a bit tricky, because of all the things it adds: CustomResourceDefinitions, ConfigMaps, MutatingWebhookConfigurations, etc. Just deleting the istio-system namespace is not sufficient. The safest bet is to use the uninstall instructions from istio.io for the method you used to install.
Kubectl: https://istio.io/docs/setup/kubernetes/install/kubernetes/#uninstall
Helm: https://istio.io/docs/setup/kubernetes/install/helm/#uninstall
When performing these steps, use the version of Istio you are attempting to remove. So if you are trying to remove Istio 1.0.2, grab that release from istio.io.
Don't forget to disable the injection:
kubectl delete -f istio-$(VERSION)/install/kubernetes/helm/istio/templates/crds.yaml
kubectl delete -f istio-$(VERSION)/install/kubernetes/istio-demo-auth.yaml
kubectl label default your-namespace istio-injection=disabled
Using the profile you used in installation, demo for example, run the following command
istioctl manifest generate --set profile=demo | kubectl delete -f -
After normal istio uninstall (depending on the way istio was installed by helm or istioctl) following steps can be performed
Check if anything still exists in the istio-system namespace, if exists then delete manually, also remove the istio-system namespace
Check if there is a sidecar associated with any pod (sometimes sidecars not get cleaned up in case of failed uninstallation)
kubectl get pods -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.namespace}{"\t"}{..image}{"\n\n"}{end}' -A | grep 'istio/proxyv' | grep -v istio-system
Get the CRD that is still in use and remove associated resources
kubectl get crds | grep 'istio.io' | cut -f1-1 -d "." | xargs -n1 -I{} bash -c " echo {} && kubectl get --all-namespaces {} -o wide && echo -e '---'"
Delete all the CRD
kubectl get crds | grep 'istio.io' | xargs -n1 -I{} sh -c "kubectl delete crd {}"
Edit the labels back (optional)
kubectl label default <namespace name> istio-injection=disabled
Just delete the ns
k delete ns istio-system
Deleting CRDs without needing to find the helm charts:
kubectl delete crd -l chart=istio
Hi if you installated via helm-template you can use these commands :
For CRD's:
$ helm template ${ISTIO_BASE_DIR}/install/kubernetes/helm/istio-init --name istio-init --namespace istio-system | kubectl delete -f -
$ kubectl delete crd $(kubectl get crd |grep istio)
For Deployment/NS..etc other resources:
$ helm template install/kubernetes/helm/istio --name istio --namespace istio-system\
--values install/kubernetes/helm/istio/values-istio-demo.yaml \
--set global.controlPlaneSecurityEnabled=true \
--set global.mtls.enabled=true | kubectl delete -f -
I am following along this article and try this on GKE. After adding the argument - --log_output_level=default:debug the change seems accepted as I get deployment.extensions/istio-sidecar-injector edited
, but I how do I know for sure?
The output of
pod=$(kubectl -n istio-system get pods -l istio=sidecar-injector -o jsonpath='{.items[0].metadata.name}')
and then
kubectl -n istio-system logs -f $pod
is the same as before and when I do (again)kubectl -n istio-system edit deployment istio-sidecar-injector the added argument is not there...
Depends on how installed Istio on GKE. There are multiple ways to install Istio from GKE.
If you're installing from http://cloud.google.com/istio which installs a Google-managed version of istio to your cluster, editing like kubectl -n istio-system edit deployment istio-sidecar-injector is a really bad idea, because Google will either revert it or the next version will wipe your modifications (so don't do it).
If you're installing yourself from Istio open source release, Istio is distributed as a Helm chart, and has bunch of kubernetes .yaml manifests. You can go edit those YAML manifests –or update Helm values.yaml files to add that argument. Then you can perform the Istio installation with the updated values.
If you're interested in getting help debugging istio, please get to a contributor community forum like Istio on Rocket Chat: https://istio.rocket.chat/ .
new to calico, trying to secure Kubernetes cluster using calico.
I have installed kubectl using command curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl referring the docs here.
I tried to install Calico Kubernetes NetworkPolicy using kubectl commands by refereeing here : kubectl create ns policy-demo creating namespace
This is then followed by creating nginx pod and services:
kubectl run --namespace=policy-demo nginx --replicas=2 --image=nginx
kubectl expose --namespace=policy-demo deployment nginx --port=80
Now, I want to uninstall and remove the policy-demo and namespace from the system.
Is there is ant way I can do it and remove this from my system using command?
How can I uninstall and remove the policy-demo?
There is a simple way of doing it.
You just need to use kubectl delete ns policy-demo to remove, clean and will delete the policy-demo namespace from the system using kubectl command.
It is already mentioned here in the end of the document: https://docs.projectcalico.org/v2.6/getting-started/kubernetes/tutorials/simple-policy