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Merge pull request #91390 from vinayakankugoyal/nonroot

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Updating kube-controller-manager to run as non-root.
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Kubernetes Prow Robot 2020-06-21 00:56:38 -07:00 committed by GitHub
commit c6011f2d54
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19
cluster/gce/gci/configure-helper.sh
View File

@ -1804,6 +1804,16 @@ function update-node-label() {
done
}
# A helper function that sets file permissions for kube-controller-manager to
# run as non root.
function run-kube-controller-manager-as-non-root {
prepare-log-file /var/log/kube-controller-manager.log ${KUBE_CONTROLLER_MANAGER_RUNASUSER} ${KUBE_CONTROLLER_MANAGER_RUNASGROUP}
setfacl -m u:${KUBE_CONTROLLER_MANAGER_RUNASUSER}:r "${CA_CERT_BUNDLE_PATH}"
setfacl -m u:${KUBE_CONTROLLER_MANAGER_RUNASUSER}:r "${SERVICEACCOUNT_CERT_PATH}"
setfacl -m u:${KUBE_CONTROLLER_MANAGER_RUNASUSER}:r "${SERVICEACCOUNT_KEY_PATH}"
}
# Starts kubernetes controller manager.
# It prepares the log file, loads the docker image, calculates variables, sets them
# in the manifest file, and then copies the manifest file to /etc/kubernetes/manifests.
@ -1901,6 +1911,15 @@ function start-kube-controller-manager {
sed -i -e "s@{{flexvolume_hostpath}}@${FLEXVOLUME_HOSTPATH_VOLUME}@g" "${src_file}"
sed -i -e "s@{{cpurequest}}@${KUBE_CONTROLLER_MANAGER_CPU_REQUEST}@g" "${src_file}"
if [[ -n "${KUBE_CONTROLLER_MANAGER_RUNASUSER:-}" && -n "${KUBE_CONTROLLER_MANAGER_RUNASGROUP:-}" ]]; then
run-kube-controller-manager-as-non-root
sed -i -e "s@{{runAsUser}}@${KUBE_CONTROLLER_MANAGER_RUNASUSER}@g" "${src_file}"
sed -i -e "s@{{runAsGroup}}@${KUBE_CONTROLLER_MANAGER_RUNASGROUP}@g" "${src_file}"
else
sed -i -e "s@{{runAsUser}}@0@g" "${src_file}"
sed -i -e "s@{{runAsGroup}}@0@g" "${src_file}"
fi
cp "${src_file}" /etc/kubernetes/manifests
}

12
cluster/gce/manifests/kube-controller-manager.manifest
View File

@ -13,12 +13,24 @@
}
},
"spec":{
"securityContext": {
"runAsUser": {{runAsUser}},
"runAsGroup": {{runAsGroup}}
},
"priorityClassName": "system-node-critical",
"priority": 2000001000,
"hostNetwork": true,
"containers":[
{
"name": "kube-controller-manager",
"securityContext": {
"allowPrivilegeEscalation": false,
"capabilities": {
"drop": [
"all"
]
}
},
"image": "{{pillar['kube_docker_registry']}}/kube-controller-manager-amd64:{{pillar['kube-controller-manager_docker_tag']}}",
"resources": {
"requests": {