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Merge pull request #43537 from Random-Liu/disable-master-taint-by-default 

Automatic merge from submit-queue

Add an env KUBE_ENABLE_MASTER_NOSCHEDULE_TAINT and disable it by default

This PR changed master `NoSchedule` taint to opt-in.

As is discussed with @bgrant0607 @janetkuo, `NoSchedule` master taint breaks existing user workload, we should not enable it by default.

Previously, NPD required the taint because it can only support one OS distro with a specific configuration. If master and node are using different OS distros, NPD will not work either on master or node. However, we've already fixed this in https://github.com/kubernetes/kubernetes/pull/40206, so for NPD it's fine to disable the taint.

This should work, but I'll still try it in my cluster to confirm.

@kubernetes/sig-scheduling-misc @dchen1107 @mikedanese
pull/6/head
Kubernetes Submit Queue 2017-03-22 17:03:33 -07:00 committed by GitHub
parent 7c24d1a665 965c262aab
commit c415325ced
3 changed files with 1 additions and 3 deletions
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1
cluster/gce/container-linux/configure-helper.sh
View File

@ -516,7 +516,6 @@ function start-kubelet {
if [[ "${REGISTER_MASTER_KUBELET:-false}" == "true" ]]; then
flags+=" --api-servers=https://${KUBELET_APISERVER}"
flags+=" --register-schedulable=false"
flags+=" --register-with-taints=node.alpha.kubernetes.io/ismaster=:NoSchedule"
else
# Standalone mode (not widely used?)
flags+=" --pod-cidr=${MASTER_IP_RANGE}"

1
cluster/gce/gci/configure-helper.sh
View File

@ -684,7 +684,6 @@ function start-kubelet {
if [[ "${REGISTER_MASTER_KUBELET:-false}" == "true" ]]; then
flags+=" --api-servers=https://${KUBELET_APISERVER}"
flags+=" --register-schedulable=false"
flags+=" --register-with-taints=node.alpha.kubernetes.io/ismaster=:NoSchedule"
else
# Standalone mode (not widely used?)
flags+=" --pod-cidr=${MASTER_IP_RANGE}"

2
cluster/saltbase/salt/kubelet/default
View File

@ -33,7 +33,7 @@
# running on the master.
{% if grains.kubelet_api_servers is defined -%}
{% set api_servers_with_port = "--api-servers=https://" + grains.kubelet_api_servers -%}
{% set master_kubelet_args = master_kubelet_args + "--register-schedulable=false --register-with-taints=node.alpha.kubernetes.io/ismaster=:NoSchedule" -%}
{% set master_kubelet_args = master_kubelet_args + "--register-schedulable=false" -%}
{% else -%}
{% set api_servers_with_port = "" -%}
{% endif -%}