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Use DNS_SERVER_IP as --cluster-dns in all cases.

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NodeLocalDNS addon listens on both DNS_SERVER_IP as well as LOCAL_DNS_IP. So cluster-dns flag can continue to be DNS_SERVER_IP in all cases.
Documented the various variables in the yaml.
This commit is contained in:
prameshj 2019-10-22 23:51:04 -07:00 committed by Pavithra Ramesh
parent 2adadf9218
commit 328f8dfe12
2 changed files with 11 additions and 3 deletions
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11
cluster/addons/dns/nodelocaldns/README.md
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@ -14,6 +14,17 @@ The variables will be substituted by the configure scripts when the yaml is copi
To create a GCE cluster with nodelocaldns enabled, use the command:
`KUBE_ENABLE_NODELOCAL_DNS=true go run hack/e2e.go -v --up`
We have the following variables in the yaml:
`__PILLAR__DNS__SERVER__` - set to kube-dns service IP.
`__PILLAR__LOCAL__DNS__` - set to the link-local IP(169.254.20.10 by default).
`__PILLAR__DNS__DOMAIN__` - set to the cluster domain(cluster.local by default).
The following variables will be set by the node-cache images - k8s.gcr.io/k8s-dns-node-cache:1.15.6 or later.
The values will be determined by reading the kube-dns configMap for custom
Upstream server configuration.
`__PILLAR__CLUSTER__DNS__` - Upstream server for in-cluster queries.
`__PILLAR__UPSTREAM__SERVERS__` - Upstream servers for external queries.
### Network policy and DNS connectivity
When running nodelocaldns addon on clusters using network policy, additional rules might be required to enable dns connectivity.

3
cluster/gce/util.sh
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@ -950,9 +950,6 @@ function print-common-kubelet-config {
declare quoted_dns_server_ip
declare quoted_dns_domain
quoted_dns_server_ip=$(yaml-quote "${DNS_SERVER_IP}")
if [[ "${ENABLE_NODELOCAL_DNS:-}" == "true" ]]; then
quoted_dns_server_ip=$(yaml-quote "${LOCAL_DNS_IP}")
fi
quoted_dns_domain=$(yaml-quote "${DNS_DOMAIN}")
cat <<EOF
kind: KubeletConfiguration