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Support running a nodelocal dns cache

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This change includes the yaml files and gce startup script changes
to run this addon. It is disabled by default, can be enabled by setting
KUBE_ENABLE_NODELOCAL_DNS=true
An ip address is required for the cache instance to listen for
requests on, default is a link local ip address of value 169.254.25.10

addressed review comments, updated image location
Picked a different prometheus port so stats port is not same as the
coredns deployment

Removed the nodelocaldns-ready label.
Set memory limit to 30Mi
This commit is contained in:
Pavithra Ramesh
2018-08-15 17:04:30 -07:00
parent 7e102de723
commit 73b548db06
14 changed files with 579 additions and 4 deletions
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28
hack/local-up-cluster.sh
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@@ -63,7 +63,9 @@ EVICTION_PRESSURE_TRANSITION_PERIOD=${EVICTION_PRESSURE_TRANSITION_PERIOD:-"1m"}
# Note also that you need API_HOST (defined above) for correct DNS.
KUBE_PROXY_MODE=${KUBE_PROXY_MODE:-""}
ENABLE_CLUSTER_DNS=${KUBE_ENABLE_CLUSTER_DNS:-true}
ENABLE_NODELOCAL_DNS=${KUBE_ENABLE_NODELOCAL_DNS:-false}
DNS_SERVER_IP=${KUBE_DNS_SERVER_IP:-10.0.0.10}
LOCAL_DNS_IP=${KUBE_LOCAL_DNS_IP:-169.254.20.10}
DNS_DOMAIN=${KUBE_DNS_NAME:-"cluster.local"}
KUBECTL=${KUBECTL:-"${KUBE_ROOT}/cluster/kubectl.sh"}
WAIT_FOR_URL_API_SERVER=${WAIT_FOR_URL_API_SERVER:-60}
@@ -704,7 +706,11 @@ function start_kubelet {
mkdir -p "/var/lib/kubelet" &>/dev/null || sudo mkdir -p "/var/lib/kubelet"
# Enable dns
if [[ "${ENABLE_CLUSTER_DNS}" = true ]]; then
dns_args="--cluster-dns=${DNS_SERVER_IP} --cluster-domain=${DNS_DOMAIN}"
if [[ "${ENABLE_NODELOCAL_DNS}" = true ]]; then
dns_args="--cluster-dns=${LOCAL_DNS_IP} --cluster-domain=${DNS_DOMAIN}"
else
dns_args="--cluster-dns=${DNS_SERVER_IP} --cluster-domain=${DNS_DOMAIN}"
fi
else
# To start a private DNS server set ENABLE_CLUSTER_DNS and
# DNS_SERVER_IP/DOMAIN. This will at least provide a working
@@ -908,6 +914,25 @@ function start_kubedns {
fi
}
function start_nodelocaldns {
if [[ "${ENABLE_NODELOCAL_DNS}" = true ]]; then
cp "${KUBE_ROOT}/cluster/addons/dns/nodelocaldns/localdns.yaml.in" nodelocaldns.yaml
sed -i -e "s/{{ pillar\['dns_domain'\] }}/${DNS_DOMAIN}/g" nodelocaldns.yaml
sed -i -e "s/{{ pillar\['dns_server'\] }}/${DNS_SERVER_IP}/g" nodelocaldns.yaml
sed -i -e "s/{{ pillar\['local_dns_ip'\] }}/${LOCAL_DNS_IP}/g" nodelocaldns.yaml
if [[ -n "${CLUSTER_IP_RANGE:-}" ]]; then
sed -i -e "s@{{ *pillar\['service_cluster_ip_range'\] *}}@${CLUSTER_IP_RANGE}@g" nodelocaldns.yaml
else
sed -i -e "s@{{ *pillar\['service_cluster_ip_range'\] *}}@0.0.0.0@g" nodelocaldns.yaml
fi
# TODO update to dns role once we have one.
# use kubectl to create nodelocaldns addon
${KUBECTL} --kubeconfig="${CERT_DIR}/admin.kubeconfig" --namespace=kube-system create -f nodelocaldns.yaml
echo "NodeLocalDNS addon successfully deployed."
rm nodelocaldns.yaml
fi
}
function start_kubedashboard {
if [[ "${ENABLE_CLUSTER_DASHBOARD}" = true ]]; then
echo "Creating kubernetes-dashboard"
@@ -1056,6 +1081,7 @@ if [[ "${START_MODE}" != "kubeletonly" ]]; then
fi
start_kubeproxy
start_kubedns
start_nodelocaldns
start_kubedashboard
fi