I have used Kubernetes and I deployed for example WordPress or nginx or etc. We install from yaml file. Where is it installed how can i find directory of pages(for example WordPress pages etc.) at same point at Google Cloud too. When I use Kubernetes at Google Cloud where is the path of installed files(ex. index.php).
If you are running the docker image directly without attaching anything like NFS, S3 or Disk then you will be able to get those files by default in the container file system(index.php and all).
With any K8s cluster you check files inside container either Gcloud or any :
kubectl get pods
kubectl exec -it <Wordpress pod name> -- /bin/bash
If you are attaching the File system like NFS, or object storage S3 or EFS you will be able to watch those files there unless you mount and apply config using the YAML file.
Regarding setup file (YAML),
Kubernetes uses the ETCD database as a data store. The flow is like this. Kubectl command connect to API server and sends the YAML file to API server. API parses and store the information in ETCD database so you wont be getting those file as it is in YAML format.
We setup a rancher cluster with 3 nodes for testing and I would like to apply for k8s conformance using this rancher cluster. However, while running sonobuoy it returns error
ERRO[0000] could not create sonobuoy client: failed to get rest config: invalid configuration: no configuration has been provided
It seems like Rancher does not have any kubernates binaries built-in (Kubectl, kubeadm etc). May I know if it is possible to be k8s conformance on a rancher cluster?
You should have kubeernetes cluster kubeconfig localy where you are running sonobuoy.
from Rancher documentation: How to Manage Kubernetes With Kubectl:
RKE:
When you create a Kubernetes cluster with RKE, RKE creates a
kube_config_rancher-cluster.yml file in the local directory that
contains credentials to connect to your new cluster with tools like
kubectl.
You can copy this file to $HOME/.kube/config or, if you are working
with multiple Kubernetes clusters
Rancher-Managed Kubernetes Clusters:
Within Rancher, you can download a kubeconfig file through the web UI
and use it to connect to your Kubernetes environment with kubectl.
From the Rancher UI, click on the cluster you would like to connect to
via kubectl. On the top right-hand side of the page, click the
Kubeconfig File button: Click on the button for a detailed look at
your config file as well as directions to place in ~/.kube/config.
Upon copying your configuration to ~/.kube/config, you will be able to
run kubectl commands without having to specify the –-kube-config file
location:
Check First launch with sonobuoy requests for a configuration - maybe it will be useful for you.
Also, look here - just for you: Conformance tests for Rancher 2.x Kubernetes
Run Conformance Test
Once you Rancher Kubernetes cluster is active, Fetch it's kubeconfig.yml file and save it locally.
Download a sonobuoy binary release of the CLI, or build it yourself by running:
$ go get -u -v github.com/heptio/sonobuoy
Configure your kubeconfig file by running:
$ export KUBECONFIG="/path/to/your/cluster/kubeconfig.yml"
Run sonobuoy:
$ sonobuoy run
Watch the logs:
$ sonobuoy logs
Check the status:
$ sonobuoy status
Once the status commands shows the run as completed, you can download the results tar.gz file:
$ sonobuoy retrieve
I'm trying to install Spinnaker on a Kubernetes setup onprem.
Following instructions from https://www.spinnaker.io/setup/
Install and run Halyard as Docker on the Kubernetes master.
Run everything as root
mkdir ~/.hal on Kubemaster. Created the service account as instrcuted in the site.
Copied the kubeconfig file from ./kube/config into ~/.hal/kubeconfig as it didnt work with docker -v option, there was some permission issue, so made it work this way
docker run halyard command -- all up and running fine.
Ran Bash and Inside halyard.
Now when I do these two things inside halyard
Point kubectl to the kubeconfig by export KUBECONFIG command
Enable kubernetes provider "hal config provider kubernetes enable"
The command gets executed sometimes successfully or it fails with this warning after timeout error
Getting object contents of versions.yml
Unexpected error comparing versions: com.netflix.spinnaker.halyard.core.error.v1.HalException: Could not load "versions.yml" from config bucket: www.googleapis.com.*
Even if it somehow manages to run successfully. When I run these,
CONTEXT=$(kubectl config current-context)
hal config provider kubernetes account add my-k8s-account --context $CONTEXT
It fails with the same error as above.
Total weird stuff. Its intermittent. Does it have something to do with the kubeconfig file? Any pointers or help would be greatly appreciated.
Thanks.
As noted in comments these kind of errors could result when there lack of network connectivity from inside the container.
As Vikram mentioned in his comment:
Yes, that was the problem. Azure support recommended installing a CNI plugin and it resolved the issue. So, it seems like inside of Azure VM without a Public IP, the CNI plugin is needed for a VM To connect to internet.
To configure CNI plugin on Azure platform use this guide.
Hope it helps.
I am trying to delete the entire kubernetes that created for my CI/CD pipeline R&D. So for deleting the cluster and everything I run the following command,
kubectl config delete-cluster <cluster-name>
kubectl config delete-context <Cluster-context>
For making sure that the clustee is deleted, I build the jenkins pipeline job again. So I found that it is deploying with updated changes.
When I run the command "kubectl config view", I found the following result,
docker#mildevdcr01:~$ kubectl config view
apiVersion: v1
clusters: []
contexts: []
current-context: kubernetes-admin#cluster.local
kind: Config
preferences: {}
users: []
docker#mildevdcr01:~$
Still my Spring Boot micro service is deploying in cluster with updated changes.
I created the Kubernetes cluster using kubespray tool that I got reference from Github:
https://github.com/kubernetes-incubator/kubespray.git
What do I need to do for the deletion of everything that I created for this Kubernetes cluster? I need to remove everything including master node.
If you setup your cluster using Kubespray, you ran whole installation using ansible, so to delete cluster you have to use it too.
But you can also reset the entire cluster for fresh installation:
$ ansible-playbook -i inventory/mycluster/hosts.ini reset.yml
Remember to keep the “hosts.ini” updated properly.
You can remove node by node from your cluster simply adding specific node do section [kube-node] in inventory/mycluster/hosts.ini file (your hosts file) and run command:
$ ansible-playbook -i inventory/mycluster/hosts.ini remove-node.yml
KubeSpray documentation: kubespray.
Useful articles: kubespray-steps, kubespray-ansible.
Okay so for a kubespray CI/CD pipeline it's a little more complicated then just deleting the cluster context. You have to actively delete other items on each node and perform a reset.yml for ETCD.
Sometimes just running the reset.yml is enough for your pipeline so it resets the cluster back to the initial state but if this is not enough then you have to delete docker, kubelet, repositories, /etc/kubernetes and many other directories on the nodes to get a clean deployment. In this case it's almost always easier to just provision new nodes in your pipeline using terraform and vsphere(vra) API.
Am working on Azure Kubernates where we can store Docker Images in Azure. Here am trying to check my kubectl version, then am getting
Unable to connect to the server: dial tcp [::1]:8080: connectex: No
connection could be made because the target machine actively refused
it.
For this I followed MSDN:uilding Microservices with AKS and VSTS – Part 2 and MSDOCS:Kubernetes on windows
So, can you please suggest me “How to resolve for this issue?”
I am on windows 10, and for me I did not enable kubernetes on Docker Desktop.
As you can see here, there are no contexts available.
So go to settings of docker desktop and enable it as follows.
Now run a command as follows.
kubectl config get-contexts
Ensure you see something like this.
Also you can also try listing the nodes as follows.
kubectl get nodes
I think you might missed out to configure the cluster, for that you need to run the below command in your command prompt.
az aks get-credentials --resource-group myResourceGroup --name myAKSCluster
The above CLI command creates .config file with complete cluster and nodes details in your local machine.
After that you run kubectl get nodes command in your command prompt, then you can get the list of nodes inside the cluster like in the below image.
For reference follow this Deploy an Azure Kubernetes Service (AKS) cluster.
If you can see that your config file is correctly configured by going to $HOME/.kube/config - Linux or %UserProfile%/.kube/config - Windows but you are still receiving the error message - try running command line as an administrator.
More information on the config file can be found here: https://kubernetes.io/docs/concepts/configuration/organize-cluster-access-kubeconfig/
In my case, I was shuffling between az aks k8s cluster and local docker-desktop.
So every time I change the cluster context I need to restart the docker, else I get the same described error.
Unable to connect to the server: dial tcp 127.0.0.1:6443: connectex: No connection could be made because the target machine actively refused it.
PS: make sure your cluster is started as shown in this picture showing (Stop local cluster)
For me it appeared to be due to Windows not having a HOME environment variable set. According to the docs kubectl will use the config file $(HOME)/.kube/config. But since this variable isn't set on Window it can't locate the file.
I created a HOME variable with the same value as USERPROFILE and it started working.
I'm using Hyper-V on Local Windows and I met this error because I didn't configure minikube.
(I know the question is about Azure, not minikube. But this article is on the top for the error message. So, I've put the solution here.)
1. enable Hyper-V.
Type in systeminfo on your Terminal. If you can find the line below,
Hyper-V Requirements: A hypervisor has been detected. Features required for Hyper-V will not be displayed.
Hyper-V works correctly.
If you can't, enable it from settings.
2. Create Hyper-V Network Switch
Open Hyper-V manager. (Searching it is the fastest way.)
Next, click your PC name on the left.
Then, you can find Virtual Switch Manager menu on the right.
Click it and choose External Virtual Switch with name: "Minikube Switch"
Click apply to create it.
3. start minikube
Go back to terminal and type in:
minikube start --vm-driver hyperv --hyperv-virtual-switch "Minikube Switch"
For more information, check the steps in this article.
Check docker is running and you started minikube or whichever cloud kube you using.
my issue resolved after running "minikube start --driver=docker"
Essentially this problem occurs if your minikube or kind isn't configured. Just try to restart your minikube or kind. If that doesn't solve your problem then try to restart your hypervisor which minikube uses.
minikube start
This command solved my issue.
I was facing the same error while firing the command "kubectl get pods"
The issue has been resolved by having following steps below:
a) First find out current-context
kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
b) if no context is set then set it manually by using
kubectl config set-context <Your context>
Hope this will help you.
If you're facing this error on windows, its possible that your docker instance is not running.
These are the steps I followed to replicate the above error;
Stopped docker and then tried to start-up an nginx-deployment. Doing this caused the mentioned error above to happen.
How did I solve it?
Check if minikube is running in my case this was not running
Start minikube
Retry applying your configuration above. In my case see the screenshot below
When you see that your deployment has been created, then all should be fine.
I had exactly the same problem even after having correct config (by running an azure cli command).
It seems that kubectl expects HOME env.variable set but it did not exist for me. There is however a solution:
If you add a KUBECONFIG environmental variable that will point to config it will start working.
Example:
setx KUBECONFIG %UserProfile%\.kube\config
When the variable is present kubectl has no troubles reading from file.
P.S. It is an alternative to setting a HOME variable as suggested in another answer.
Azure self-hosted agent doesn't have the permission to access Kubernates cluster:
Remove Azure self-hosted agent - .\config.cmd Remove
configure again ( .\config.cmd) with a user have permission to access Kubernates cluster
I encountered similar problem:
> kubectl cluster-info
"To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
Unable to connect to the server: dial tcp xxx.x.x.x:8080: connectex: No connection could be made because the target machine actively refused it."
> kubectl cluster-info dump
Unable to connect to the server: dial tcp xxx.0.0.x:8080: connectex: No connection could be made because the target machine actively refused it.
This setup was working fine until Docker for Desktop bought it's own copy of kubectl. There are 2 ways to overcome this situation:
1 - Quit / Stop Docker for Desktop while using the cluster
2 - Set KUBECONFIG file path
I tried both the options and they worked.
Found a good source for .kube/config, sending it over here for quick reference:
apiVersion: v1
clusters:
- cluster:
certificate-authority: fake-ca-file
server: https://1.2.3.4
name: development
- cluster:
insecure-skip-tls-verify: true
server: https://5.6.7.8
name: scratch
contexts:
- context:
cluster: development
namespace: frontend
user: developer
name: dev-frontend
- context:
cluster: development
namespace: storage
user: developer
name: dev-storage
- context:
cluster: scratch
namespace: default
user: experimenter
name: exp-scratch
current-context: ""
kind: Config
preferences: {}
users:
- name: developer
user:
client-certificate: fake-cert-file
client-key: fake-key-file
- name: experimenter
user:
password: some-password
username: exp
Reference: https://kubernetes.io/docs/tasks/access-application-cluster/configure-access-multiple-clusters/
Following #ilya-chernomordik,
I've added my config path to the System Variable by doing
setx KUBECONFIG "D:\Minikube\Minikube.minikube\config"
I have changed the default Location from C: Drive to D: Drive as i have less space in C.
Now the problem is fixed.
edit: after 5 mins, the api server again stopped. It's been more than 5-6 hours i'm trying to solve this issue. I'm not sure why this problem is happening, even after adding the coreect path.
On Rancher Desktop, make sure context is correctly choosen
In my situation, I'm in windows with docker desktop in a simple scenario just for studies, but the case is:
In the docker version in 20.10 or above, it come with kubernetes installed. Then it doesn't necessary installed a cluster adm like minikube. Then, when it just need to enable kubernetes in Docker Desktop configuration. Like:
Go to Docker Desktop: settings > kubernetes > check the box inside section Enable kubernetes and then click in Restart Kubernetes Cluster
When we do this, the docker provide all needed to works Kubernetes properly.
Referenced by: Blog