I installed the minikube for local kubernetes development according to article DevOps-Kubernetes-1-Running-Kubernetes-Locally-via-Minikube
Ubuntu 16.04 LTS
minikube 0.20.0
The default kubernetes for minikube 0.20.0 is v1.6.4 and I use follow command to use new release v1.7.0
minikube start --kubernetes-version v1.7.0
How can I set this as default in configuration for minikube ?
So far, if I run minikube start, it always starts default v1.6.4 even the server VM is upgraded to v1.7.0
$ minikube start
Starting local Kubernetes v1.6.4 cluster...
Starting VM...
...
$ kubectl version
Client Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.0",
GitCommit:"d3ada0119e776222f11ec7945e6d860061339aad", GitTreeState:"clean",
BuildDate:"2017-06-29T23:15:59Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}
The connection to the server 192.168.42.96:8443 was refused - did you specify the right host or port?
You can set its default value with:
minikube config set kubernetes-version v1.7.0
It edits ~/.minikube/config/config.json and adds:
{
"kubernetes-version": "v1.7.0"
}
Check out Selecting a Kubernetes version in the documentation. Check source code config.go for reference.
Related
I'm using minikube to test the kompose.
I installed k8s using the following minikube command
# minikube start --driver=none --kubernetes-version v1.16.0
minikube v1.9.2 on Ubuntu 18.04
✨ Using the none driver based on user configuration
👍 Starting control plane node in cluster minikube
🤹 Running on localhost (CPUs=XX, Memory=XXXXXMB, Disk=XXXXXMB) ...
ℹ️ OS release is Ubuntu 18.04.3 LTS
🐳 Preparing Kubernetes v1.16.0 on Docker 18.09.7 ...
▪ kubelet.resolv-conf=/run/systemd/resolve/resolv.conf
❗ This bare metal machine is having trouble accessing https://k8s.gcr.io
💡 To pull new external images, you may need to configure a proxy: https://minikube.sigs.k8s.io/docs/reference/networking/proxy/
🌟 Enabling addons: default-storageclass, storage-provisioner
🤹 Configuring local host environment ...
❗ The 'none' driver is designed for experts who need to integrate with an existing VM
💡 Most users should use the newer 'docker' driver instead, which does not require root!
📘 For more information, see: https://minikube.sigs.k8s.io/docs/reference/drivers/none/
❗ kubectl and minikube configuration will be stored in /root
❗ To use kubectl or minikube commands as your own user, you may need to relocate them. For example, to overwrite your own settings, run:
▪ sudo mv /root/.kube /root/.minikube $HOME
▪ sudo chown -R $USER $HOME/.kube $HOME/.minikube
💡 This can also be done automatically by setting the env var CHANGE_MINIKUBE_NONE_USER=true
🏄 Done! kubectl is now configured to use "minikube"
💡 For best results, install kubectl: https://kubernetes.io/docs/tasks/tools/install-kubectl/
and curl, chmod, mv install kubectl
# kubectl versionClient Version: version.Info{Major:"1", Minor:"16", GitVersion:"v1.16.0", GitCommit:"2bd9643cee5b3b3a5ecbd3af49d09018f0773c77", GitTreeState:"clean", BuildDate:"2019-09-18T14:36:53Z", GoVersion:"go1.12.9", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"16", GitVersion:"v1.16.0", GitCommit:"2bd9643cee5b3b3a5ecbd3af49d09018f0773c77", GitTreeState:"clean", BuildDate:"2019-09-18T14:27:17Z", GoVersion:"go1.12.9", Compiler:"gc", Platform:"linux/amd64"}
But when I use the kompose up command, it shows connection rejection
kompose -f docker-compose.yaml up
INFO We are going to create Kubernetes Deployments, Services and PersistentVolumeClaims for your Dockerized application. If you need different kind of resources, use the 'kompose convert' and 'kubectl create -f' commands instead.
FATA Error while deploying application: Get https://127.0.0.1:6443/api: dial tcp 127.0.0.1:6443: connect: connection refused
Querying the kubectl configuration found that its port was 8443, different from the 6443 connected by kompose up
# kubectl cluster-info
Kubernetes master is running at https://172.26.90.122:8443
KubeDNS is running at https://172.26.90.122:8443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
I think that's the problem, but I don't know how to fix it to make the ports match, right.
I would appreciate it if you could tell me how to solve it?
You add this flag in the start command
--apiserver-port=6443
MacOs
I just install kubectl via: https://kubernetes.io/docs/tasks/tools/install-kubectl/#install-kubectl-on-macos
MacBook-Air:~ admin$ kubectl version
Client Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.0", GitCommit:"70132b0f130acc0bed193d9ba59dd186f0e634cf", GitTreeState:"clean", BuildDate:"2019-12-07T21:20:10Z", GoVersion:"go1.13.4", Compiler:"gc", Platform:"darwin/amd64"}
The connection to the server localhost:8080 was refused - did you specify the right host or port?
what could be the problem, Any ideas?
kubectl version prints out both the client version and server version. To fetch the server version, it connects to kubernetes api server. You either do not have the cluster installed or have not configured your kubectl properly to communicate with the remote cluster. So it is only printing client version and throwing an error for server version.
Sample output:
# kubectl version
Client Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.5", GitCommit:"2166946f41b36dea2c4626f90a77706f426cdea2", GitTreeState:"clean", BuildDate:"2019-03-25T15:26:52Z", GoVersion:"go1.11.5", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.5", GitCommit:"2166946f41b36dea2c4626f90a77706f426cdea2", GitTreeState:"clean", BuildDate:"2019-03-25T15:19:22Z", GoVersion:"go1.11.5", Compiler:"gc", Platform:"linux/amd64"}
You can use kubectl version --client to get only client version.
# kubectl version --client
Client Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.5", GitCommit:"2166946f41b36dea2c4626f90a77706f426cdea2", GitTreeState:"clean", BuildDate:"2019-03-25T15:26:52Z", GoVersion:"go1.11.5", Compiler:"gc", Platform:"linux/amd64"}
As you mentioned you have installed kubectl - command-line tool, which allows you to run commands against Kubernetes clusters. You can use kubectl to deploy applications, inspect and manage cluster resources, and view logs.
However to kubectl could run any command you need to have a cluster.
The most common is Minikube. However, you will need a hypervisor as Virtualbox or Hyperkit.
You also should read about Docker Desktop on Mac.
If you will search for more information you can find that people also using Kubeadm but its not supported on MacOS.
It was mentioned in another StackOverflow question, you can find it here.
Note : kubectl is a command-line tool tool that allows you to run commands against Kubernetes clusters
In order for kubectl to find and access a given kubernetes cluster, it needs kubeconfig file for a given K8s cluster you want to connect with (if you dont have one you can install a local cluster to play with using something like K8s Minikube which will then give you this file to connect to minikube)
If you already have a cluster then check that kubectl is properly configured use kubectl cluster-info command , if it is not you will receive below error log.
$ kubectl cluster-info
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
The connection to the server localhost:8080 was refused - did you specify the right host or port?
So to connect to a cluster you want work toward using kubectl you need to find kubeconfig file and configure the environment variable to point to it. Meaning if your $HOME/.kube/config file is not already listed in your KUBECONFIG environment variable, fix your KUBECONFIG environment variable by export KUBECONFIG=$KUBECONFIG:$HOME/.kube/config to point to correct kubeconfig file to be used.
Once you have right kubeconfig exported cluster-info command should load the details as below
$ kubectl cluster-info
Kubernetes master is running at https://xx.xx.xx.xx:6443
KubeDNS is running at https://xx.xx.xx.xx:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
I just finished installing kubectl via Ubuntu 64 (Linux).
I followed the online Kubernetes guide, but I've had an error with the host. After the first step (install kubectl), when I checked the kubectl version, this was the message (I didn't yet install and deploy the minikube because I've not the connection according to this problem):
root#ubuntu:~# kubectl version
Client Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.1", GitCommit:"eec55b9ba98609a46fee712359c7b5b365bdd920", GitTreeState:"clean", BuildDate:"2018-12-13T10:39:04Z", GoVersion:"go1.11.2", Compiler:"gc", Platform:"linux/amd64"}
The connection to the server localhost:8080 was refused - did you specify the right host or port?
Does someone have the same problem? How can I fix it?
The reason behind that is kubectl version prints Client Version and Server Version (kubernetes version) both. When you just install kubectl it is just Kubernetes client. If you have kubernetes cluster installed, it will print both kubectl version and kubernetes version.
If you want to just want to print client version, then use following command:
kubectl version --client=true
The error meant kubectl tried to contact the kubernetes server to get its version but couldn't connect. Are you specifying the right host or port to connect to the kubernetes server.
The reason behind the error is you have not installed kubernetes cluster on you mac. You just installed kubectl which is just a client to access kubernetes cluster. Once you install the kubernetes cluster the output of kubectl version will be like:
[root#ip-10-0-1-138 centos]# kubectl version
Client Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.1",
GitCommit:"eec55b9ba98609a46fee712359c7b5b365bdd920", GitTreeState:"clean", BuildDate:"2018-12-13T10:39:04Z", GoVersion:"go1.11.2", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.3", GitCommit:"2bba0127d85d5a46ab4b778548be28623b32d0b0", GitTreeState:"clean", BuildDate:"2018-05-21T09:05:37Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
If you want to install the complete kubernetes cluster on mac, please try minikube to install cluster locally.
This happens when Kubectl command cannot find the config file inside the user's .kube folder. Here are the steps that you will need for your user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Or if you are the root user:
export KUBECONFIG=/etc/kubernetes/admin.conf
When i run the kubectl version command , I get the following error message.
kubectl version
Client Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.0", GitCommit:"925c127ec6b946659ad0fd596fa959be43f0cc05", GitTreeState:"clean", BuildDate:"2017-12-15T21:07:38Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"linux/amd64"}
Unable to connect to the server: dial tcp 192.168.99.100:8443: i/o timeout
How do I resolve this?
You can get relevant information about the client-server status by using the following command.
kubectl config view
Now you can update or set k8s context accordingly with the following command.
kubectl config use-context CONTEXT-CHOSEN-FROM-PREVIOUS-COMMAND-OUTPUT
you can do further action on kubeconfig file. the following command will provide you with all necessary information.
kubectl config --help
You have to run first
minikube start
on your terminal. This will do following things for you:
Restarting existing virtualbox VM for "minikube" ...
⌛ Waiting for SSH access ...
📶 "minikube" IP address is 192.168.99.100
🐳 Configuring Docker as the container runtime ...
🐳 Version of container runtime is 18.06.3-ce
⌛ Waiting for image downloads to complete ...
✨ Preparing Kubernetes environment ...
🚜 Pulling images required by Kubernetes v1.14.1 ...
🔄 Relaunching Kubernetes v1.14.1 using kubeadm ...
⌛ Waiting for pods: apiserver proxy etcd scheduler controller dns
📯 Updating kube-proxy configuration ...
🤔 Verifying component health ......
💗 kubectl is now configured to use "minikube"
🏄 Done! Thank you for using minikube!
If you use minikube then you should run, kubectl config use-context minikube
If you use latest docker for desktop that comes with kubernetes then you should run, kubectl config use-context docker-for-desktop
I was facing the same issue on Ubuntu 18.04.1 LTS.
The solution provided here worked for me.
Just putting the same data here:
Get current cluster name and Zone:
gcloud container clusters list
Configure Kubernetes to use your current cluster:
gcloud container clusters get-credentials [cluster name] --zone [zone]
Hope it helps.
I had the same issue when I tried use kubrnetes installed with Docker. It turned out that it was not enbled by default.
First I enabled kubrnetes in Docker options and then I changed context for docker-for-desktop
kubectl config get-contexts
kubectl config use-context docker-for-desktop
It solved the issue.
This problem occurs because of minikube. Restart minikube will solve this problem.Run below command and it will work-
minikube stop
minikube delete
minikube start
Was facing the same problem with accessing GKE master from Google Cloud Shell.
Then I followed this GCloud doc to solve it.
Open GCloud Shell
Get External IP of the current GCloud Shell with:
dig +short myip.opendns.com #resolver1.opendns.com
Add this External IP into the "Master authorized networks" section of the GKE cluster - with a CIDR suffix of /32
After that, running kubectl get nodes from the GCloud Shell worked right away.
I got similar problem when I run
$ kubectl version
Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.11", GitCommit:"637c7e288581ee40ab4ca210618a89a555b6e7e9", GitTreeState:"clean", BuildDate:"2018-11-26T14:38:32Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"darwin/amd64"}
Unable to connect to the server: dial tcp 192.168.99.100:8443: i/o timeout
And here's how I tried and finally worked.
I installed Docker Desktop on Mac (Version 2.0.0.3) firstly.
Then I installed the kubectl with command
$ brew install kubectl
.....
==> Pouring kubernetes-cli-1.16.0.high_sierra.bottle.tar.gz
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink bin/kubectl
Target /usr/local/bin/kubectl
already exists. You may want to remove it:
rm '/usr/local/bin/kubectl'
To force the link and overwrite all conflicting files:
brew link --overwrite kubernetes-cli
To list all files that would be deleted:
brew link --overwrite --dry-run kubernetes-cli
Possible conflicting files are:
/usr/local/bin/kubectl -> /Applications/Docker.app/Contents/Resources/bin/kubectl
.....
That doesn't matter, we have already got the kubectl.
Then I install minikube with command
$ brew cask install minikube
...
==> Linking Binary 'minikube-darwin-amd64' to '/usr/local/bin/minikube'.
🍺 minikube was successfully installed!
start minikube first time (VirtualBox not installed)
$ minikube start
😄 minikube v1.4.0 on Darwin 10.13.6
💿 Downloading VM boot image ...
> minikube-v1.4.0.iso.sha256: 65 B / 65 B [--------------] 100.00% ? p/s 0s
> minikube-v1.4.0.iso: 135.73 MiB / 135.73 MiB [-] 100.00% 7.75 MiB p/s 18s
🔥 Creating virtualbox VM (CPUs=2, Memory=2000MB, Disk=20000MB) ...
🔄 Retriable failure: create: precreate: VBoxManage not found. Make sure VirtualBox is installed and VBoxManage is in the path
...
💣 Unable to start VM
❌ Error: [VBOX_NOT_FOUND] create: precreate: VBoxManage not found. Make sure VirtualBox is installed and VBoxManage is in the path
💡 Suggestion: Install VirtualBox, or select an alternative value for --vm-driver
📘 Documentation: https://minikube.sigs.k8s.io/docs/start/
⁉️ Related issues:
▪ https://github.com/kubernetes/minikube/issues/3784
Install VirtualBox, then start minikube second time (VirtualBox installed)
$ minikube start
😄 13:37:01.006849 35511 cache_images.go:79] CacheImage kubernetesui/dashboard:v2.0.0-beta4 -> /Users/kaka.go/.minikube/cache/images/kubernetesui/dashboard_v2.0.0-beta4 failed: read tcp 10.49.52.206:50350->104.18.125.25:443: read: operation timed out
🐳 Preparing Kubernetes v1.16.0 on Docker 18.09.9 ...
E1002 13:37:33.632298 35511 start.go:706] Error caching images: Caching images for kubeadm: caching images: caching image /Users/kaka.go/.minikube/cache/images/kubernetesui/dashboard_v2.0.0-beta4: read tcp 10.49.52.206:50350->104.18.125.25:443: read: operation timed out
❌ Unable to load cached images: loading cached images: loading image /Users/kaka.go/.minikube/cache/images/kubernetesui/dashboard_v2.0.0-beta4: stat /Users/kaka.go/.minikube/cache/images/kubernetesui/dashboard_v2.0.0-beta4: no such file or directoryminikube v1.4.0 on Darwin 10.13.6
🔥 Creating virtualbox VM (CPUs=2, Memory=2000MB, Disk=20000MB) ...
E1002
💾 Downloading kubeadm v1.16.0
💾 Downloading kubelet v1.16.0
🚜 Pulling images ...
🚀 Launching Kubernetes ...
💣 Error starting cluster: timed out waiting to elevate kube-system RBAC privileges: Temporary Error: creating clusterrolebinding: Post https://192.168.99.100:8443/apis/rbac.authorization.k8s.io/v1beta1/clusterrolebindings: dial tcp 192.168.99.100:8443: i/o timeout
😿 Sorry that minikube crashed. If this was unexpected, we would love to hear from you:
👉 https://github.com/kubernetes/minikube/issues/new/choose
❌ Problems detected in kube-addon-manager [b17d460ddbab]:
error: no objects passeINFO:d == Kuto apberneply
error: no objectNsF Op:a == Kubernetssed tes ado appdon ely
start minikube 3rd time
$ minikube start
😄 minikube v1.4.0 on Darwin 10.13.6
💡 Tip: Use 'minikube start -p <name>' to create a new cluster, or 'minikube delete' to delete this one.
🏃 Using the running virtualbox "minikube" VM ...
⌛ Waiting for the host to be provisioned ...
🐳 Preparing Kubernetes v1.16.0 on Docker 18.09.9 ...
🔄 Relaunching Kubernetes using kubeadm ...
! still got stuck on Relaunching
I enable Kubernetes config in Docker Preferences setting, restart my Mac and switch the Kubernetes context to docker-for-desktop.
Oh, the kubectl version works this time, but with the context docker-for-desktop
$ kubectl version
Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.11", GitCommit:"637c7e288581ee40ab4ca210618a89a555b6e7e9", GitTreeState:"clean", BuildDate:"2018-11-26T14:38:32Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.11", GitCommit:"637c7e288581ee40ab4ca210618a89a555b6e7e9", GitTreeState:"clean", BuildDate:"2018-11-26T14:25:46Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
start minikube 4th time (after restart system maybe)
$ minikube start
😄 minikube v1.4.0 on Darwin 10.13.6
💡 Tip: Use 'minikube start -p <name>' to create a new cluster, or 'minikube delete' to delete this one.
🔄 Starting existing virtualbox VM for "minikube" ...
⌛ Waiting for the host to be provisioned ...
🐳 Preparing Kubernetes v1.16.0 on Docker 18.09.9 ...
🔄 Relaunching Kubernetes using kubeadm ...
⌛ Waiting for: apiserver proxy etcd scheduler controller dns
🏄 Done! kubectl is now configured to use "minikube"
Finally, it works with minikube context...
$ kubectl version
Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.11", GitCommit:"637c7e288581ee40ab4ca210618a89a555b6e7e9", GitTreeState:"clean", BuildDate:"2018-11-26T14:38:32Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"16", GitVersion:"v1.16.0", GitCommit:"2bd9643cee5b3b3a5ecbd3af49d09018f0773c77", GitTreeState:"clean", BuildDate:"2019-09-18T14:27:17Z", GoVersion:"go1.12.9", Compiler:"gc", Platform:"linux/amd64"}
i checked the firewall port and it was closed, i opened it and it started working.
If you are using azure and have recently changed your password try this:
az account clear
az login
After logging in successfully:
az aks get-credentials --name project_name --resource-group resource_group_name
Now when you run
kubectl get nodes
you should see something. Also, make sure you are using the correct kubectl context.
My problem was that I use 2 virtual networks on my VM. The network which Kubernetes uses is always the one of the Default Gateway. However the communication network between my VMs was the other one.
You can force Kubernetes to use a different network by using the folowing flags:
sudo kubeadm init --pod-network-cidr=192.168.0.0/16 --apiserver-cert-extra-sans=xxx.xxx.xxx.xxx --apiserver-advertise-address=xxx.xxx.xxx.xxx
Change the xxx.xxx.xxx.xxx with the commmunication IP address of your K8S master.
I have two contexts and I got this error when I was in the incorrect one of the two so I switched the context and this error was resolved.
To see your current context: kubectl config current-context
To see the contexts you have: kubectl config view
To switch context: kubectl config use-context context-cluster-name
Adding this here so it can help someone with a similar problem.
In our case, we had to configure our VPC network to export its custom routes for VPC peering “gke-jn7hiuenrg787hudf-77h7-peer” in project “” to the control plane's VPC network.
The control plane's VPC network is already configured to import custom routes. This provides a path for the control plane to send packets back to on-premise resources.
Step-1: Run command to see all list of context:
kubectl config view
Step-2: Now switch your context where you want to work.
kubectl config use-context [context-name]
For example:
kubectl config use-context docker-desktop
I face the same issue, it might be your ip was not added into authorize network list in the Kubernetes Cluster. Simply navigate to:
GCP console -> Kubernetes Engine -> Click into the Clusters you wish to interact with
In the target Cluster page look for:
Control plane authorized networks -> click pencil icon -> Add Authorized Network
Add your External Ip with a CIDR suffix of /32 (xxx.xxx.xxx.xxx/32).
One way to get your external IP on terminal / CMD:
curl -4 ifconfig.co
I need some help in creating my first Kubernetes cluster with Vagrant. I have installed Kubernetes, Vagrant and libvirt. My kubectl status displays:
[root#localhost ~]# kubectl version
Client Version: version.Info{Major:"1", Minor:"0", GitVersion:"v1.0.6", GitCommit:"388061f00f0d9e4d641f9ed4971c775e1654579d", GitTreeState:"clean"}
Server Version: version.Info{Major:"1", Minor:"0", GitVersion:"v1.0.6", GitCommit:"388061f00f0d9e4d641f9ed4971c775e1654579d", GitTreeState:"clean"}
From the documentation I can read that the cluster can be started with:
export KUBERNETES_PROVIDER=vagrant ./cluster/kube-up.sh
However no "cluster" folder has been created by installing kubernetes, nor the "kube-up.sh" command is available. I can see only the following ones:
kube-apiserver kube-controller-manager kubectl kubelet kube-proxy kube-scheduler kube-version-change
Am I missing some steps ? Thanks
From the documentation I can read that the cluster can be started with:
export KUBERNETES_PROVIDER=vagrant ./cluster/kube-up.sh
This documentation assumes that you have downloaded a kubernetes release. You can grab the latest release (1.1.7) from the github releases page. Once you unpack kubernetes.tar.gz you should see a cluster directory with kube-up.sh inside of it that you can execute it as suggested by the documentation.