kubeadm upgrade apply - stuck

hello2sharad

I am upgrading kubernetes using kubeadm from 20.1 to 20.2
Console Output -
[upgrade/staticpods] Component "kube-scheduler" upgraded successfully!
[upgrade/postupgrade] Applying label node-role.kubernetes.io/control-plane='' to Nodes with label node-role.kubernetes.io/master='' (deprecated)
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.20" in namespace kube-system with the configuration for the kubelets in the cluster
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to get nodes
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[addons] Applied essential addon: CoreDNS

In another putty session - showing below

NAME READY STATUS RESTARTS AGE
calico-kube-controllers-744cfdf676-fgtgr 0/1 CrashLoopBackOff 28 141m

Any idea

serewicz

Hello,

Our lab environment is not yet using 20.1 nor updating to 20.2. What happens when you follow the lab as written?

Are there any errors or indications in the output of kubectl -n kube-system logs calico-kube-controllers-?

Regards,

hello2sharad

Thanks Serewicz for the response. I can see below error in log

2021-01-16 21:27:03.488 [ERROR][1] client.go 261: Error getting cluster information config ClusterInformation="default" error=Get "https://10.96.0.1:443/apis/crd.projectcalico.org/v1/clusterinformations/default": dial tcp 10.96.0.1:443: connect: no route to host
2021-01-16 21:27:03.488 [FATAL][1] main.go 114: Failed to initialize Calico datastore error=Get "https://10.96.0.1:443/apis/crd.projectcalico.org/v1/clusterinformations/default": dial tcp 10.96.0.1:443: connect: no route to host

chrispokorni

Hi @hello2sharad,

Did you try to delete the calico-kube-controller-... Pod to allow the Deployment controller to re-deploy it?

Regards,
-Chris

furqanbaqai

Hi,

I bumped in to the same issue and it seems to be a bug reported here as well Kubeadm Issue# 2035

Jus to highlight, i am updating from v.18.8 to v1.19.0, also reconciled with https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm-upgrade/ but error is persisting.

[email protected]:~/k8ssetup$ sudo kubeadm upgrade apply v1.19.0
[upgrade/config] Making sure the configuration is correct:
[upgrade/config] Reading configuration from the cluster...
[upgrade/config] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[preflight] Running pre-flight checks.
[upgrade] Running cluster health checks
[upgrade/version] You have chosen to change the cluster version to "v1.19.0"
[upgrade/versions] Cluster version: v1.19.7
[upgrade/versions] kubeadm version: v1.19.7
[upgrade/confirm] Are you sure you want to proceed with the upgrade? [y/N]: y
[upgrade/prepull] Pulling images required for setting up a Kubernetes cluster
[upgrade/prepull] This might take a minute or two, depending on the speed of your internet connection
[upgrade/prepull] You can also perform this action in beforehand using 'kubeadm config images pull'
[upgrade/apply] Upgrading your Static Pod-hosted control plane to version "v1.19.0"...
Static pod: kube-apiserver-ckan01 hash: a9e702f54ca7ad08e4f0aad39aedabc7
Static pod: kube-controller-manager-ckan01 hash: c5e60c4d599740592efddb382b4c673d
Static pod: kube-scheduler-ckan01 hash: 3167cdaddf6f15b096f2eb409185adc5
[upgrade/etcd] Upgrading to TLS for etcd
[upgrade/etcd] Non fatal issue encountered during upgrade: the desired etcd version "3.4.13-0" is not newer than the currently installed "3.4.13-0". Skipping etcd upgrade
[upgrade/staticpods] Writing new Static Pod manifests to "/etc/kubernetes/tmp/kubeadm-upgraded-manifests053835124"
[upgrade/staticpods] Preparing for "kube-apiserver" upgrade
[upgrade/staticpods] Renewing apiserver certificate
[upgrade/staticpods] Renewing apiserver-kubelet-client certificate
[upgrade/staticpods] Renewing front-proxy-client certificate
[upgrade/staticpods] Renewing apiserver-etcd-client certificate
[upgrade/staticpods] Moved new manifest to "/etc/kubernetes/manifests/kube-apiserver.yaml" and backed up old manifest to "/etc/kubernetes/tmp/kubeadm-backup-manifests-2021-01-23-10-19-02/kube-apiserver.yaml"
[upgrade/staticpods] Waiting for the kubelet to restart the component
[upgrade/staticpods] This might take a minute or longer depending on the component/version gap (timeout 5m0s)
Static pod: kube-apiserver-ckan01 hash: a9e702f54ca7ad08e4f0aad39aedabc7
Static pod: kube-apiserver-ckan01 hash: 98610ddf262474b522fe96193a20c293
[apiclient] Found 1 Pods for label selector component=kube-apiserver
[upgrade/staticpods] Component "kube-apiserver" upgraded successfully!
[upgrade/staticpods] Preparing for "kube-controller-manager" upgrade
[upgrade/staticpods] Renewing controller-manager.conf certificate
[upgrade/staticpods] Moved new manifest to "/etc/kubernetes/manifests/kube-controller-manager.yaml" and backed up old manifest to "/etc/kubernetes/tmp/kubeadm-backup-manifests-2021-01-23-10-19-02/kube-controller-manager.yaml"
[upgrade/staticpods] Waiting for the kubelet to restart the component
[upgrade/staticpods] This might take a minute or longer depending on the component/version gap (timeout 5m0s)
Static pod: kube-controller-manager-ckan01 hash: c5e60c4d599740592efddb382b4c673d
Static pod: kube-controller-manager-ckan01 hash: ead3b8933eb874ce423dbc0be136df58
[apiclient] Found 1 Pods for label selector component=kube-controller-manager
[upgrade/staticpods] Component "kube-controller-manager" upgraded successfully!
[upgrade/staticpods] Preparing for "kube-scheduler" upgrade
[upgrade/staticpods] Renewing scheduler.conf certificate
[upgrade/staticpods] Moved new manifest to "/etc/kubernetes/manifests/kube-scheduler.yaml" and backed up old manifest to "/etc/kubernetes/tmp/kubeadm-backup-manifests-2021-01-23-10-19-02/kube-scheduler.yaml"
[upgrade/staticpods] Waiting for the kubelet to restart the component
[upgrade/staticpods] This might take a minute or longer depending on the component/version gap (timeout 5m0s)
Static pod: kube-scheduler-ckan01 hash: 3167cdaddf6f15b096f2eb409185adc5
Static pod: kube-scheduler-ckan01 hash: 23d2ea3ba1efa3e09e8932161a572387
[apiclient] Found 1 Pods for label selector component=kube-scheduler
[upgrade/staticpods] Component "kube-scheduler" upgraded successfully!
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.19" in namespace kube-system with the configuration for the kubelets in the cluster
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to get nodes
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[addons] Applied essential addon: CoreDNS

Also performed the following steps:

• Deleted calico-kube-controllers deployment
• Deleted coredns and re-enable the add on by issuing following command:

[email protected]:~/k8ssetup$ sudo kubeadm init phase addon coredns --config kubeadm-config.yaml
W0123 10:09:38.823436   14857 configset.go:348] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io]
[addons] Applied essential addon: CoreDNS       

Details of the Environment
Operating System:

Distributor ID: Ubuntu
Description:    Ubuntu 18.04.1 LTS
Release:        18.04
Codename:       bionic

kubeadm Version:

[email protected]:~$ kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.7", GitCommit:"1dd5338295409edcfff11505e7bb246f0d325d15", GitTreeState:"clean", BuildDate:"2021-01-13T13:21:39Z", GoVersion:"go1.15.5", Compiler:"gc", Platform:"linux/amd64"}

kubectl version:

[email protected]:~$ kubectl version
Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.15", GitCommit:"73dd5c840662bb066a146d0871216333181f4b64", GitTreeState:"clean", BuildDate:"2021-01-13T13:22:41Z", GoVersion:"go1.13.15", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.0", GitCommit:"e19964183377d0ec2052d1f1fa930c4d7575bd50", GitTreeState:"clean", BuildDate:"2020-08-26T14:23:04Z", GoVersion:"go1.15", Compiler:"gc", Platform:"linux/amd64"}

Appreciate some help

serewicz

Hello,

I note that you have version 1.18.15 and 1.19.0 for kubectl and 1.19.7 for kubeadm. This tends to be problematic, as typically the upgrade is designed to match versions. We lock our version of kubernetes in the lab, so somewhere you have diverged from the lab.

What happens when you follow the lab and all the software is on 1.18.1 before you update to 1.19.0?

Regards,