I am trying to deploy and manage the Kubernetes cluster using OpenID Connect issuer, I have followed this Microsoft Document to deploy the application on AKS for that I have created the resource group and install the AKS preview extension
`az group create --name myResourceGroup --location eastus
az extension add --name aks-preview
az extension update --name aks-preview
#register the enabled workload identity
az feature register --namespace "Microsoft.ContainerService" --name "EnableWorkloadIdentityPreview"az feature show --namespace "Microsoft.ContainerService" --name "EnableWorkloadIdentityPreview"
az provider register --namespace Microsoft.ContainerService`
After that when I am trying to create the Kubernetes cluster with --enable-oidc-isser I am getting below error, it is taking more than 10 minutes and showing some error
(OIDCIssuerUnsupportedk8sVersion) OIDC issuer feature requires at least Kubernetes version 1.20.0. Code: OIDCIssuerUnsupportedK8sVersion Message: OIDC issuer feature requires at least Kubernetes version 1.20.0
I have upgraded to the latest version but still getting same error.
How can I export OIDC Issuer to set the Environment variables on the cluster.
Thanks in Advance :)
I tried to reproduce the same issue in my environment and got the below results
My current version is 1.23.12
I have created the resource group and install the extension preview and registered the EnabledworkloadidentityPreview using below command
az feature register --namespace "Microsoft.ContainerService" --name "EnableWorkloadIdentityPreview"
To verify the status used the below command
az feature show --namespace "Microsoft.ContainerService" --name "EnableWorkloadIdentityPreview"
I have created the AKS cluster with --enable-oidc-issuer parameter to use the OIDC issuer using below command
az aks create -g rg -n cluster --node-count 1 --enable-oidc-issuer --enable-workload-identity --generate-ssh-keys
When I check in my environment and got the same error
To resolve this issue I have upgraded my AKS version using below commands
My current version is 1.23.12
I have upgraded the to newest version using this SO answer
My current version is 1.24.3 and when I the below OIDC command I am able access
az aks create -g <rg-name> -n cluster --node-count 1 --enable-oidc-issuer --enable-workload-identity --generate-ssh-keys
NOTE: This error will occur if the version is more than 1.20.0 we have to upgrade the version to latest version not to current version then only it will work
I would like to view kubelet logs going back in time in Azure AKS. All I could find from Azure docs was how to ssh into the nodes and list the logs (https://learn.microsoft.com/en-us/azure/aks/kubelet-logs) but I feel like this has to be aggregated in Log Analytics somewhere right ?
However I wasn't able to find anything in Log Analytics for Kubernetes. Am I missing something ?
We have omsagent daemonset installed and Microsoft.OperationalInsights/workspaces is enabled
Thanks :)
I tried to reproduce this issue in my environment and got below results:
I created resource group and VM by setting up the Subscription
az account set --subscription "subscription_name"
az group create --location westus resourcegroup_name
created the AKS Cluster with the parameter to enable the AKS Container Insights
The following Example will creates the Cluster with name AKSRG.
az aks create -g myResourceGroup -n resourceGroup_name --enable-managed-identity --node-count 1 --enable-addons monitoring --enable-msi-auth-for-monitoring --generate-ssh-keys
Here I have configured the kubectl to connect the kubernetes cluster with the get-credentials command
I have created the interactive shell connection to the node
using kubectl debug
kubectl debug node/pod_name -it --image=mcr.microsoft.com/dotnet/runtime-deps:6.0
I have used the below Command in after hash(#) tag
journalctl -u kubelet -o cat
To get the logs check the nodes and pods
We can use the below command to check the KUBE LOGS
kubectl logs pod_name
Reference:
View kubelet logs in Azure Kubernetes Service (AKS) - Azure Kubernetes Service | Microsoft Docs
I'm beginning to build out a kubernetes cluster for our applications. We are using Azure for cloud services, so my K8s cluster is built using AKS. The AKs cluster was created using the portal interface for Azure. It has one node, and I am attempting to create a pod with a single container to deploy to the node. Where I am stuck currently is trying to connect to the AKS cluster from Powershell.
The steps I have taken are:
az login (followed by logging in)
az account set --subscription <subscription id>
az aks get-credentials --name <cluster name> --resource-group <resource group name>
kubectl get nodes
After entering the last line, I am left with the error: Unable to connect to the server: dial tcp: lookup : no such host
I've also gone down a few other rabbit holes found on SO and other forums, but quite honestly, I'm looking for a straight forward way to access my cluster before complicating it further.
Edit: So in the end, I deleted the resource I was working with and spun up a new version of AKS, and am now having no trouble connecting. Thanks for the suggestions though!
As of now, the aks run command adds a fourth option to connect to private clusters extending #Darius's three options posted earlier:
Use the AKS Run Command feature.
Below are some copy/paste excerpts of a simple command, and one that requires a file. It is possible to chain multiple commands with &&.
az aks command invoke \
--resource-group myResourceGroup \
--name myAKSCluster \
--command "kubectl get pods -n kube-system"
az aks command invoke \
--resource-group myResourceGroup \
--name myAKSCluster \
--command "kubectl apply -f deployment.yaml -n default" \
--file deployment.yaml
In case you get a (ResourceGroupNotFound) error, try adding the subscription, too
az aks command invoke \
--resource-group myResourceGroup \
--name myAKSCluster \
--subscription <subscription> \
--command "kubectl get pods -n kube-system"
You can also configure the default subscription:
az account set -s <subscription>
Unable to connect to the server: dial tcp: lookup : no such host
The error is coming because of private cluster. The Private Cluster option is enabled while creating the AKS cluster. You need to disable this option.
Kubectl is a kubernetes control client. It is an external connectivity provider to connect with our kubernetes cluster. We can't connect with the private cluster externally.
Believe me.... just disable the private cluster options And see your success. Thank you.
Note: We can't disable this option after the cluster creation. you need to delete the cluster and again reform it.
Posting this as Community Wiki for better visibility.
Solution provided by OP:
Delete resource and spun up a new version of AKS.
For details, you can check docs Create a resource group, Create AKS cluster and resource create.
Next try worth to try:
kubectl config use-context <cluster-name>
as it was proposed in similar Github issue.
Gaurav's answer pretty much sums it up. In fact you can refer to the documentation which states that
The API server endpoint has no public IP address. To manage the API
server, you'll need to use a VM that has access to the AKS cluster's
Azure Virtual Network (VNet). There are several options for
establishing network connectivity to the private cluster.
To connect to a private cluster, there are only 3 methods:
Create a VM in the same Azure Virtual Network (VNet) as the AKS cluster.
Use a VM in a separate network and set up Virtual network peering. See the section below for more information on this option.
Use an Express Route or VPN connection.
It is more convenient to use Az module from desktop Powershell for any management operation with Azure portal. Microsoft adds a lot of new cmdlets for managing AKS and Service Fabric clusters.
Please take a look Az.Aks
In your case:
Connect-AzAccount
Get-AzAksNodePool
I was also facing the issue, I'm using a private cluster and I have a machine (bastion) in a different vnet with peering enabled but still, I was not able to connect the cluster (I was able to SSH and telnet to the machine).
Then I added a virtual network link in the private DNS zone for the vnet where the bastion host resides. It worked for me, I'm able to access the cluster.
When using a private cluster, the kubernetes api-endpoint is only accessible on the cluster's VNet. Connecting via VPN unfortunately does not work painlessly since the azure private DNS will not be available via for VPN clients (yet).
However, it is possible to connect kubectl directly to the IP-address of the api-endpoint, but that will require you to ignore certificate errors since we are using the IP directly.
If you edit your .kube/config and change the server address to the IP number. Then call kubectl with something like this
kubectl get all --all-namespaces --insecure-skip-tls-verify
Usually, this is all that is required to connect. Check whether firewall is not blocking any traffic. Also, verify subscription id and other identifiers again and make sure you are using the correct values. If the issue still persists, I recommend you ask azure support to help you out.
I had the same issues when running the kubectl command from jenkins. For me it was the permission issues of ~/.kube/config I gave it access to jenkins as well which solved the issue for me.
You can run kubectl commands on a private AKS cluster using az aks command invoke. Refer to this for more info.
As for why you might want to run private AKS clusters, read this
You can simply append "--admin" to the query as seen below.
az aks get-credentials --name <cluster name> --resource-group <resource group name> --admin
I also hit this after restarting my kubernetes cluster, but it turned out I was just not waiting long enough, after about 10 minutes the "kubectrl" commands started working again.
If you are using AWS with kops then this might help you
mkdir autoscaler
cd autoscaler/
git clone https://github.com/kubernetes/autoscaler.git
create a file called ig-policy.json with the contents
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"autoscaling:DescribeAutoScalingGroups",
"autoscaling:DescribeAutoScalingInstances",
"autoscaling:DescribeLaunchConfigurations",
"autoscaling:SetDesiredCapacity",
"autoscaling:TerminateInstanceInAutoScalingGroup"
],
"Resource": "*"
}
]
}
Then you need to create iam policy
aws iam create-policy --policy-name ig-policy --policy-document file://ig-policy.json
And attach the above create iam policy with the user id to the cluster name
aws iam attach-role-policy --policy-arn arn:aws:iam::005935423478650:policy/ig-policy --role-name nodes.testing.k8s.local
Then update the cluster
kops update cluster testing.k8s.local --yes
Then run
kops rolling-update cluster
Creating private not easy journey, but it has beautiful views so I encourage anyone to get there.
I did it all in terraform, so some names can be little different than they are in portal/azure CLI.
And this is how I did it:
Private DNS zone, with name as privatelink.westeurope.azmk8s.io
VNET where AKS will be placed (let's call it vnet-access)
Virtual network from which you want to access AKS
Private AKS (private_dns_zone_id set to dns zone form first point)
Virtual network link (in private DNS zone, pointing to VNET from point 3)
Peering between networks from points 2 and 3.
This should allow any machine in vnet-access to firstly resolve DNS, and then - to access cluster...
Yet... if you want to get there from your local machine, this is another setup. Fortunately Microsoft have such tutorial here
If you find that something is still not working - put the error in comment and I'll try to adapt my answer to cover this.
For me I had this issue when I was trying to connect a new Linux user to my Elastic Kubernetes Cluster in AWS.
I setup a new user called jenkins-user, then I tried to run the command below to get pods:
kubectl get pods
And then I will run into the error below:
Unable to connect to the server: dial tcp: lookup 23343445ADFEHGROGMFDFMG.sk1.eu-east-2.eks.amazonaws.com on 198.74.83.506:53: no such host
Here's how I solved it:
The issue was because I had not set the context for the Kubernetes cluster in the kube config file of the new linux user (jenkins-user).
All I had to do was either first install the aws-cli for this new user (install it into the home directory of this new user). And then run the command aws configure to configure the necessary credentials. Although, since I already had the aws-cli setup for the other users on the Linux system I simply copied the ~/.aws directory from an already existing user to the jenkins-user home directory using the command:
sudo cp -R /home/existing-user/.aws/ /home/jenkins-user/
Next, I had to create a context for the Kubernetes configuration which will create a new ~/.kube/config file for the jenkins-user using the command below:
aws eks --region my-aws-region update-kubeconfig --name my-cluster-name
Next, I checked the kube config file to confirm that my context has been added using the command:
sudo nano /.kube/config
This time when I ran the command below, it was successful:
kubectl get pods
Resources: Create a kubeconfig for Amazon EKS
I faced the same issue and resolved it by deleting .kube folder which was under the following path C:\Users\<your_username> and then restarting kubernetes cluster.
I add bitnami.bitnami/rabbitmq into my acr.
In VSO release pipeline, I add 2 tasks kubectl run & expose, looks like below.
kubectl run rabbitmq --image xxxxxx.azurecr.io/bitnami.bitnami/rabbitmq:3.7.7 --port=15672
kubectl expose deployment rabbitmq --type=LoadBalancer --port=15672 --target-port=15672
After save and release it, everything is successful, but now I can't proxy into my dashboard using
az aks browse -g {groupname} -n {k8sname}
When I remove the above 2 task in my release, I able to connect to my dashboard.
Can someone explain to me what going wrong, how to troubleshoot it.
You can check if the pods work well in your Azure Kubernetes Cluster. If everything is OK. Then you should make sure that if your current OS has the browser. The command az aks browse -g {groupname} -n {k8sname} need a browser to open the dashboard where it executes.
You can open the k8s dashboard in another OS with the command you posted after you get the credential with the command az aks get-credentials -g {groupname} -n {k8sname}. Of curse, you need to execute az login first.
If things above all are OK, you could try this link.
I have created a Azure container Service
orchestratorType : Kubernetes
Group-Name : Mygrp
DNS : MyDNs
Now I have to install kubectl on m/c and service , pods too
For this I logged into my account from azure CLI
I need azure kubernetes credentials for kubectl and command for taht is
az acs kubernetes get-credentials --resource-group=<cluster-resource-group> --name=<cluster-name>
From above Info , I know cluster-resource-group is Mygrp (or I am wrong ?) but what will be cluster-name ?
Or their is something I have configure for this ?
We can find the --name via Azure Portal: