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add coredns migration support to upgrade.sh

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This commit is contained in:
Sandeep Rajan 2019-05-24 10:34:13 -04:00
parent f2dd24820a
commit e57b867957
1 changed files with 83 additions and 0 deletions
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83
cluster/gce/upgrade.sh
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@ -439,6 +439,85 @@ function do-node-upgrade() {
echo "== Finished upgrading nodes to ${KUBE_VERSION}. ==" >&2
}
function update-coredns-config() {
# Get the current CoreDNS version
local -r coredns_addon_path="/etc/kubernetes/addons/0-dns/coredns"
local -r tmpdir=/tmp
local -r download_dir=$(mktemp --tmpdir=${tmpdir} -d coredns-migration.XXXXXXXXXX) || exit 1
# Get the new installed CoreDNS version
echo "Waiting for CoreDNS to update"
until [[ $(${KUBE_ROOT}/cluster/kubectl.sh -n kube-system get deployment coredns -o=jsonpath='{$.metadata.resourceVersion}') -ne ${COREDNS_DEPLOY_RESOURCE_VERSION} ]]; do
sleep 1
done
echo "Fetching the latest installed CoreDNS version"
NEW_COREDNS_VERSION=$(${KUBE_ROOT}/cluster/kubectl.sh -n kube-system get deployment coredns -o=jsonpath='{$.spec.template.spec.containers[:1].image}' | cut -d ":" -f 2)
case "$(uname -m)" in
x86_64*)
host_arch=amd64
;;
i?86_64*)
host_arch=amd64
;;
amd64*)
host_arch=amd64
;;
aarch64*)
host_arch=arm64
;;
arm64*)
host_arch=arm64
;;
arm*)
host_arch=arm
;;
i?86*)
host_arch=x86
;;
s390x*)
host_arch=s390x
;;
ppc64le*)
host_arch=ppc64le
;;
*)
echo "Unsupported host arch. Must be x86_64, 386, arm, arm64, s390x or ppc64le." >&2
exit 1
;;
esac
# Download the CoreDNS migration tool
echo "== Downloading the CoreDNS migration tool =="
wget -P ${download_dir} "https://github.com/coredns/corefile-migration/releases/download/v1.0.2/corefile-tool-${host_arch}" >/dev/null 2>&1
chmod +x ${download_dir}/corefile-tool-${host_arch}
# Migrate the CoreDNS ConfigMap depending on whether it is being downgraded or upgraded.
${KUBE_ROOT}/cluster/kubectl.sh -n kube-system get cm coredns -o jsonpath='{.data.Corefile}' > ${download_dir}/Corefile-old
if test "$(printf '%s\n' ${CURRENT_COREDNS_VERSION} ${NEW_COREDNS_VERSION} | sort -V | head -n 1)" != ${NEW_COREDNS_VERSION}; then
echo "== Upgrading the CoreDNS ConfigMap =="
./corefile-tool-${host_arch} migrate --from ${CURRENT_COREDNS_VERSION} --to ${NEW_COREDNS_VERSION} --corefile ${download_dir}/Corefile-old > ${download_dir}/Corefile
${KUBE_ROOT}/cluster/kubectl.sh -n kube-system create configmap coredns --from-file ${download_dir}/Corefile -o yaml --dry-run | ${KUBE_ROOT}/cluster/kubectl.sh apply -f -
else
# In case of a downgrade, a custom CoreDNS Corefile will be overwritten by a default Corefile. In that case,
# the user will need to manually modify the resulting (default) Corefile after the downgrade is complete.
echo "== Applying the latest default CoreDNS configuration =="
gcloud compute --project ${PROJECT} scp --zone ${ZONE} ${MASTER_NAME}:${coredns_addon_path}/coredns.yaml ${download_dir}/coredns-manifest.yaml > /dev/null
${KUBE_ROOT}/cluster/kubectl.sh apply -f ${download_dir}/coredns-manifest.yaml
fi
# clean up
rm -rf ${download_dir}
echo "== The CoreDNS Config has been updated =="
}
echo "Fetching the previously installed CoreDNS version"
CURRENT_COREDNS_VERSION=$(${KUBE_ROOT}/cluster/kubectl.sh -n kube-system get deployment coredns -o=jsonpath='{$.spec.template.spec.containers[:1].image}' | cut -d ":" -f 2)
COREDNS_DEPLOY_RESOURCE_VERSION=$(${KUBE_ROOT}/cluster/kubectl.sh -n kube-system get deployment coredns -o=jsonpath='{$.metadata.resourceVersion}')
master_upgrade=true
node_upgrade=true
node_prereqs=false
@ -580,6 +659,10 @@ if [[ "${node_upgrade}" == "true" ]]; then
fi
fi
if [[ "${CLUSTER_DNS_CORE_DNS:-}" == "true" ]]; then
update-coredns-config
fi
echo "== Validating cluster post-upgrade =="
"${KUBE_ROOT}/cluster/validate-cluster.sh"