can't join the second master on lab 16.2

Hi,
I´m having problems joining a second master to the cluster.
I ran this command and I get the next message:
[email protected]:~$ sudo kubeadm join k8smaster:6443 --token lmcgs9.mwh1gukep4zrrsrb --discovery-token-ca-cert-hash sha256:c7f09153d5eb1ca4d1aaae5a72563b249893b0c0d5ba4c0f66ff309ab51cbd6e --control-plane --certificate-key 03b1178073e62dada4c46e06e9b9f60ce974806153f3af0e6783d0c410e2e4b9
[preflight] Running pre-flight checks
[WARNING Service-Docker]: docker service is not enabled, please run 'systemctl enable docker.service'
[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 -o yaml'
error execution phase preflight:
One or more conditions for hosting a new control plane instance is not satisfied.
unable to add a new control plane instance a cluster that doesn't have a stable controlPlaneEndpoint address
Please ensure that:
- The cluster has a stable controlPlaneEndpoint address.
- The certificates that must be shared among control plane instances are provided.
To see the stack trace of this error execute with --v=5 or higher
[email protected]:~$
what should I check on this situation? how can i check my control plane has a stable controlPlaneEndpoint address?
Thanks in advance
Emiliano
Comments
-
Hi @emiliano.sutil,
The steps to join the second and third control-plane nodes are based on similar steps from earlier lab exercises when the worker node joined the primary control-plane node. These errors may be the result of an incomplete step either during software packages installation, or /etc/hosts file configured with an incorrect IP address for the "k8smaster" alias instead of the proxy IP and your request not reaching the primary API server.
I would suggest running through these steps one more time with a clean second control-plane node, ensuring that all steps are followed as closely as possible.
Regards,
-Chris0 -
Hi @chrispokorni
Thanks for your answer.I have repeated the process and I get the same problem.
the ips on the hosts files are:
k8smaster
10.128.1.20 k8smaster k8smasterha-proxy
10.128.1.20 k8smaster k8smastermaster:
10.128.1.20 k8smaster k8smastersecondmaster:
10.128.1.20 k8smaster k8smasterthe haproxy.cfg
backend k8sServers
balance roundrobin
server master 10.128.1.3:6443 checkthe 10.128.1.3 is the ip of my master
the http://10.128.1.20:9999/stats/
works fine and when I run
kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8smaster Ready control-plane,master 57d v1.20.1
worker Ready 57d v1.20.1the stats updates, so I think the haproxy is properly configured.
any idea?
thanks in advance
0 -
Hi @emiliano.sutil,
Your issues are caused by your host naming convention, which is not aligned with the host naming convention presented in the lab guide.
The lab guide introduces three control-plane nodes:
master
,SecondMaster
, andThirdMaster
, withworker
andha-proxy
nodes. Thek8smaster
alias is just that, an alias assigned to themaster
node for the first 13 chapters (from Ch 3 to Ch 15) and then assigned to theha-proxy
node in Ch 16, to help the cluster identify the one node that captures traffic meant for the control-plane. In the beginning, themaster
node alone represents the control-plane and it is aliased withk8smaster
. In the HA chapter, theha-proxy
node becomes thek8smaster
once the control-plane grows from one to three nodes.In your situation, you have a node with the
k8smaster
hostname which has one IP address, and you also have thek8smaster
alias on theha-proxy
node with the 10.128.1.20 IP address.This configuration is confusing for cluster traffic management and needs to be cleaned up.
Regards,
-Chris0
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