I have a kubernetes cluster with 3 master nodes. They are named master-1, master-2 and master-3. I would like to rename them as control-plane-n.
I could not find a clear procedure to do this. The closest one is how to rename a node in a cluster. So I just tried that. Here is what I did (my hosts are running ubuntu 18.04, and kubernetes v1.16.2):
On master-1:
kubectl drain master-3 --ignore-daemonsets
kubectl delete node master-3
Run "kubeadm token create --print-join-command" and copy the output
On master-3:
sudo kubeadm reset
sudo hostnamectl set-hostname control-plane-3
Modify /etc/cloud/cloud.cfg to set preserve_hostname to true
Reboot the VM
Paste in the join command from master-1, with --control-plane option added
Here is the log I got:
sudo kubeadm join 172.22.19.188:6443 --control-plane --token nxxzby.zsfdx86e7cv1rq0e --discovery-token-ca-cert-hash sha256:553366c2f91fd3abffe3e3d1c39d9314e2d73e8a6181f4da9938a8e24fd77456
[preflight] Running pre-flight checks
[WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[preflight] Running pre-flight checks before initializing the new control plane instance
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
[certs] Using certificateDir folder "/data/kubernetes/pki"
error execution phase control-plane-prepare/certs: error creating PKI assets: failed to write or validate certificate "apiserver": certificate apiserver is invalid: x509: certificate is valid for master-3, kubernetes, kubernetes.default, kubernetes.default.svc, kubernetes.default.svc.cluster.local, not control-plane-3
To see the stack trace of this error execute with --v=5 or higher
How can I proceed? Or is there a better approach?
Thanks in advance for any idea or suggestion you can offer.
Based on #zerkms comment, you can create a 4th node with a proper name, join, then remove one of the old from the cluster.
Doing this 3 times you will be able to have all node with the desired name.
Related
I have a dask cluster running in minikube in a remote VM (Oracle Linux, 64GB, 8 core). The VM connects through proxy to external networks.
I want to access the Jupyter notebook provided by Dask from my browser running in my local Mac.
I would like to understand what are the options available for me to setup this connection.
Here is what I tried:
minikube start --driver=docker --base-image="gcr.io/k8s-minikube/kicbase:v0.0.29" --memory 32768 --cpus 6
minikube tunnel
helm install mydask dask/dask --set scheduler.serviceType=LoadBalancer --set jupyter.serviceType=LoadBalancer
While this does provide external-ip to the 'mydask-jupyter' service, the IP is not in the same subnet as my VM. Therefore it is not publicly accessible.
Next I tried starting minikube as below:
minikube start --driver=none
However running into other errors:
💢 initialization failed, will try again: wait: /bin/bash -c "sudo env PATH="/var/lib/minikube/binaries/v1.23.1:$PATH" kubeadm init --config /var/tmp/minikube/kubeadm.yaml --ignore-preflight-errors=DirAvailable--etc-kubernetes-manifests,DirAvailable--var-lib-minikube,DirAvailable--var-lib-minikube-etcd,FileAvailable--etc-kubernetes-manifests-kube-scheduler.yaml,FileAvailable--etc-kubernetes-manifests-kube-apiserver.yaml,FileAvailable--etc-kubernetes-manifests-kube-controller-manager.yaml,FileAvailable--etc-kubernetes-manifests-etcd.yaml,Port-10250,Swap,Mem": exit status 1
stdout:
[init] Using Kubernetes version: v1.23.1
[preflight] Running pre-flight checks
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
stderr:
[WARNING Firewalld]: firewalld is active, please ensure ports [8443 10250] are open or your cluster may not function correctly
[WARNING Swap]: swap is enabled; production deployments should disable swap unless testing the NodeSwap feature gate of the kubelet
[WARNING Hostname]: hostname "my-dask" could not be reached
[WARNING Hostname]: hostname "my-dask": lookup my-dask on <<IP>> no such host
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-apiserver:v1.23.1: output: Trying to pull repository k8s.gcr.io/kube-apiserver ...
Get "https://k8s.gcr.io/v2/": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
, error: exit status 1
...
My Questions:
What configurations are required to fix this?
Is there a better alternative to minikube that will be convenient for this use-case?
Thank you.
I'm playing around with Kubernetes on Virtualbox. I have created 2 VMs, one is the Master - the other one is the Worker. The Worker is a clone of the basis installation of the master. I guess that's the root-cause of the problem, maybe there's some config left over which causes conflicts.
When I try to join the Worker with ...
sudo kubeadm join 192.168.56.101:6443 --token ... --discovery-token-ca-cert-hash ...
I get the following error ...
error execution phase kubelet-start: a Node with name "test-virtualbox"
and status "Ready" already exists in the cluster. You must delete the
existing Node or change the name of this new joining Node
I have tried to reset the config with ...
sudo kubeadm reset
But after running the join command I get the same error again.
I also tried to delete the node "test-virtualbox" by running ...
sudo kubectl delete node test-virtualbox
But this results in the error ...
The connection to the server localhost:8080 was refused
There are several problems or questions you mentioned
a Node with name "test-virtualbox" and status "Ready" already exists in the cluster.
kubeadm uses the hostname as the node name by default, as you Clone the worker from the master, they should have the same hostname as the error said.
the solution for this could be:
Give Worker a new hostname by hostnamectl or some other tools.
Use the --node-name flag when joining the worker
sudo kubeadm reset
reset is used to reset a node inside the cluster, your worker has not yet joined, it does nothing when you did this.
sudo kubectl delete node test-virtualbox
This is executed on the Worker, right?
The Worker has not yet joined the cluster, so you do not have a kubeconfig in ~/.kube/config, kubectl will use localhost:8080 as server address by default, it can not connect to the target API Server, so that error occurred.
just running "sudo kubectl delete node test-virtualbox" on the master
When I restart the docker service in work node, the logs of kubelet in master node report a no such file error.
# in work node
# systemctl restart docker service
# in master node
# journalctl -u kubelet
# failed to load Kubelet config file /var/lib/kubelet/config.yaml, error failed to read kubelet config file "/var/lib/kubelet/config.yaml", error: open /var/lib/kubelet/config.yaml: no such file or directory
Arghya is right but I would like to add some info you should be aware of:
You can execute kubeadm init phase kubelet-start to only invoke a particular step that will write the kubelet configuration file and environment file and then start the kubelet.
After performing a restart there is a chance that swap would re-enable. Make sure to run swapoff -a in order to turn it off.
If you encounter any token validation problems than simply run kubeadm token create --print-join-command and than do the join process with the provided info. Remember that tokens expire after 24 hours by default.
If you wish to know more about kubeadm init phase you can find it here and here.
Please let me know if that helped.
You might have done kubeadm reset which cleans up all files.
Just do kubeadm reset --force to reset the node and then kubeadm init in master node and kubeadm join in woker node thereafter.
I follow this to install kubernetes on my cloud.
When I run command kubectl get nodes I get this error:
The connection to the server localhost:6443 was refused - did you specify the right host or port?
How can I fix this?
If you followed only mentioned docs it means that you have only installed kubeadm, kubectl and kubelet.
If you want to run kubeadm properly you need to do 3 steps more.
1. Install docker
Install Docker ubuntu version. If you are using another system chose it from left menu side.
Why:
If you will not install docker you will receive errror like below:
preflight] WARNING: Couldn't create the interface used for talking to the container runtime: docker is required for container runtime: exec: "docker": e
xecutable file not found in $PATH
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR FileContent--proc-sys-net-bridge-bridge-nf-call-iptables]: /proc/sys/net/bridge/bridge-nf-call-iptables does not exist
[ERROR FileContent--proc-sys-net-ipv4-ip_forward]: /proc/sys/net/ipv4/ip_forward contents are not set to 1
[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
2. Initialization of kubeadm
You have installed properly kubeadm and docker but now you need to initialize kubeadm. Docs can be found here
In short version you have to run command
$ sudo kubeadm init
After initialization you will receive information to run commands like:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
and token to join another VM to cluster. It looks like
kubeadm join 10.166.XX.XXX:6443 --token XXXX.XXXXXXXXXXXX \
--discovery-token-ca-cert-hash sha256:aXXXXXXXXXXXXXXXXXXXXXXXX166b0b446986dd05c1334626aa82355e7
If you want to run some special action in init phase please check this docs.
3. Change node status to Ready
After previous step you will be able to execute
$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
ubuntu-kubeadm NotReady master 4m29s v1.16.2
But your node will be in NotReady status. If you will describe it $ kubectl describe node you will see error:
Ready False Wed, 30 Oct 2019 09:55:09 +0000 Wed, 30 Oct 2019 09:50:03 +0000 KubeletNotReady runtime network not ready: Ne
tworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized
It means that you have to install one of CNIs. List of them can be found here.
EDIT
Also one thing comes to my mind.
Sometimes when you turned off and on VM you need to restart
kubelet and docker service. You can do it by using
$ service docker restart
$ systemctl restart kubelet
Hope it helps.
Looks like kubeconfig file is missing.. Did you copy admin.conf file to ~/.kube/config ?
Verify if there are any proxies set like "http_proxy" or "https_proxy", mostly we set it as environment variables. If yes, then remove the proxies and it should work for you.
I did the following 2 steps. The kubectl works now.
$ service docker restart
$ systemctl restart kubelet
I have set up my master node and I am trying to join a worker node as follows:
kubeadm join 192.168.30.1:6443 --token 3czfua.os565d6l3ggpagw7 --discovery-token-ca-cert-hash sha256:3a94ce61080c71d319dbfe3ce69b555027bfe20f4dbe21a9779fd902421b1a63
However the command hangs forever in the following state:
[preflight] Running pre-flight checks
[WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/
Since this is just a warning, why does it actually fails?
edit: I noticed the following in my /var/log/syslog
Mar 29 15:03:15 ubuntu-xenial kubelet[9626]: F0329 15:03:15.353432 9626 server.go:193] failed to load Kubelet config file /var/lib/kubelet/config.yaml, error failed to read kubelet config file "/var/lib/kubelet/config.yaml", error: open /var/lib/kubelet/config.yaml: no such file or directory
Mar 29 15:03:15 ubuntu-xenial systemd[1]: kubelet.service: Main process exited, code=exited, status=255/n/a
Mar 29 15:03:15 ubuntu-xenial systemd[1]: kubelet.service: Unit entered failed state.
First if you want to see more detail when your worker joins to the master use:
kubeadm join 192.168.1.100:6443 --token m3jfbb.wq5m3pt0qo5g3bt9 --discovery-token-ca-cert-hash sha256:d075e5cc111ffd1b97510df9c517c122f1c7edf86b62909446042cc348ef1e0b --v=2
Using the above command I could see that my worker could not established connection with the master, so i just stoped the firewall:
systemctl stop firewalld
This can be solved by creating a new token
using this command:
kubeadm token create --print-join-command
and use the token generated for joining other nodes to the cluster
The problem had to do with kubeadm not installing a networking CNI-compatible solution out of the box;
Therefore, without this step the kubernetes nodes/master are unable to establish any form of communication;
The following task addressed the issue:
- name: kubernetes.yml --> Install Flannel
shell: kubectl -n kube-system apply -f https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml
become: yes
environment:
KUBECONFIG: "/etc/kubernetes/admin.conf"
when: inventory_hostname in (groups['masters'] | last)
I did get the same error on CentOS 7 but in my case join command worked without problems, so it was indeed just a warning.
> [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker
> cgroup driver. The recommended driver is "systemd". Please follow the
> guide at https://kubernetes.io/docs/setup/cri/ [preflight] Reading
> configuration from the cluster... [preflight] FYI: You can look at
> this config file with 'kubectl -n kube-system get cm kubeadm-config
> -oyaml' [kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.14" ConfigMap in the kube-system namespace
As the official documentation mentions, there are two common issues that make the init hang (I guess it also applies to join command):
the default cgroup driver configuration for the kubelet differs from
that used by Docker. Check the system log file (e.g. /var/log/message)
or examine the output from journalctl -u kubelet. If you see something
like the following:
First try the steps from official documentation and if that does not work please provide more information so we can troubleshoot further if needed.
I had a bunch of k8s deployment scripts that broke recently with this same error message... it looks like docker changed it's install. Try this --
previous install:
apt-get isntall docker-ce
updated install:
apt-get install docker-ce docker-ce-cli containerd.io
How /var/lib/kubelet/config.yaml is created?
Regarding the /var/lib/kubelet/config.yaml: no such file or directory error.
Below are steps that should occur on the worker node in order for the mentioned file to be created.
1 ) The creation of the /var/lib/kubelet/ folder. It is created when the kubelet service is installed as mentioned here:
sudo apt-get update && sudo apt-get install -y apt-transport-https curl
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
cat <<EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF
sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl
2 ) The creation of config.yaml. The kubeadm join flow should take place so when you run kubeadm join, kubeadm uses the Bootstrap Token credential to perform a TLS bootstrap, which fetches the credential needed to download the kubelet-config-1.X ConfigMap and writes it to /var/lib/kubelet/config.yaml.
After a successful execution you should see the logs below:
.
.
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
.
.
So, after these 2 steps you should have /var/lib/kubelet/config.yaml in place.
Failure of the kubeadm join flow
In your case, it seems that the kubeadm join flow failed which might happen due to multiple reasons like bad configuration of iptables, ports that are already in use, container runtime not installed properly, etc' - as described here and here.
As far as I know, the fact that no networking CNI-compatible solution was in place should not affect the creation of /var/lib/kubelet/config.yaml:
A) We can see the under the kubeadm preflight checks what issues will cause the join phase to fail.
B ) I also tested this issue by removing the current solution I used (Calico) and ran kubeadm reset and kubeadm join again and no errors appeared in the kubeadm logs (I've got the successful execution logs I mentioned above) and /var/lib/kubelet/config.yaml was created properly.
(*) Of course that the cluster can't function in this state - I just wanted to emphasize that I think the problem was one of the options mentioned in A.