188a92fe0e
Add two files to Debian package kubernetes-unversioned to support
kubernetes upgrades. We need to remove undesired feature gates from the
kubeadm configmap before the upgrade to 1.24.
The following two files are both required by puppet class:
platform::kubernetes::upgrade_first_control_plane,
* upgrade_k8s_config.sh - upgrade script to update apiserver/kubelet
configmap
* kubelet_override.yaml - empty / non-customized override file. This
file is being referenced, we keep override functionality even though
we do not currently require kubelet overrides.
Test Plan:
TODO: Kubernetes upgrade from k8s 1.23 to 1.24
TODO: Platform upgrade from k8s 1.23, followed by kubernetes upgrade
from k8s 1.23 to 1.24
Story: 2010301
Task: 46692
Signed-off-by: Jim Gauld <james.gauld@windriver.com>
Change-Id: Ibb2438c79b2983d2bc6beeaec287795f3c6c124f
99 lines
3.4 KiB
Bash
Executable File
99 lines
3.4 KiB
Bash
Executable File
#!/bin/bash
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# Copyright (c) 2022 Wind River Systems, Inc.
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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# This will run during a k8s upgrade as a part of the control-plane upgrade of
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# the first master. It updates the kubeadm-config configmap to edit the
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# manifests and remove the 'feature-gates' lines.
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#
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# Background:
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# Kubernetes 1.24 no longer allows setting kube-apsierver feature-gate
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# RemoveSelfLink=false. All the other feature gates we were using now default
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# to true so we don't want to specify them anymore.
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# Temporary configuration file
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KUBEADM_CONFIGMAP_TMPFILE=$(mktemp /tmp/kubeadm_cm.yaml.XXXXXX 2>/dev/null)
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# Log info message to /var/log/daemon.log
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function LOG {
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logger -p daemon.info "$0($$): " "${@}"
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}
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# Log error message to /var/log/daemon.log
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function ERROR {
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logger -s -p daemon.error "$0($$): " "${@}"
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}
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# Cleanup and exit
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function cleanup_and_exit {
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rm -v -f "${KUBEADM_CONFIGMAP_TMPFILE}"
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exit "${1:-0}"
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}
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# Update the configmap for kubeadm
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function update_apiserver_configmap {
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LOG "Retrieving kubeadm configmap: ${KUBEADM_CONFIGMAP_TMPFILE}"
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counter=0
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RETRIES=10
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RC=0
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until [ $counter -gt $RETRIES ]; do
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kubectl --kubeconfig=/etc/kubernetes/admin.conf -n kube-system get \
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configmap kubeadm-config -o yaml > "${KUBEADM_CONFIGMAP_TMPFILE}"
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RC=$?
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if [ "$RC" = "0" ] ; then
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LOG "Kubeadm configmap retrieved."
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break
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((counter+=1))
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fi
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ERROR "Failed to retrieve kubeadm configmap, retrying..."
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sleep 5
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((counter+=1))
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done
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if [ $counter -gt $RETRIES ]; then
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ERROR "Failed to retrieve kubeadm configmap with error code [$RC]".
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cleanup_and_exit $RC
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fi
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if grep -q 'RemoveSelfLink=false' "${KUBEADM_CONFIGMAP_TMPFILE}"; then
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LOG "Updating kube-apiserver feature-gates in retrieved kubeadm-config"
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if sed -i '/feature-gates/d' "${KUBEADM_CONFIGMAP_TMPFILE}"; then
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if ! grep -q 'RemoveSelfLink=false' "${KUBEADM_CONFIGMAP_TMPFILE}";
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then
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LOG "Successfully updated retrieved kubeadm-config"
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if kubectl --kubeconfig=/etc/kubernetes/admin.conf replace -f \
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"${KUBEADM_CONFIGMAP_TMPFILE}"; then
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LOG 'Successfully replaced updated kubeadm configmap.'
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else
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RC=$?
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ERROR "Failed to replace updated kubeadm configmap with error code: [$RC]"
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cleanup_and_exit $RC
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fi
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else
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ERROR 'Failed to update kube-apiserver feature-gates with an unknown error'
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cleanup_and_exit 1
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fi
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else
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RC=$?
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ERROR "Failed to update ${KUBEADM_CONFIGMAP_TMPFILE} with error code: [$RC]"
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cleanup_and_exit $RC
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fi
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else
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LOG "Kubeadm configmap was already updated with RemoveSelfLink=false removed. Nothing to do."
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fi
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}
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# Update kube-apiserver configMap only for k8s 1.23.1
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K8S_VERSION_FROM='v1.23.1'
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K8S_VERSION=$(kubectl version --output=yaml| grep -m1 -oP 'gitVersion: \K(\S+)')
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if [[ "${K8S_VERSION}" == "${K8S_VERSION_FROM}" ]]; then
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LOG "k8s version ${K8S_VERSION} matches ${K8S_VERSION_FROM}"
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update_apiserver_configmap
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else
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LOG "k8s version ${K8S_VERSION} does not match ${K8S_VERSION_FROM}, skip update"
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fi
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cleanup_and_exit 0
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