Add autoscalers for dnsmasq and kubedns

By default kubedns and dnsmasq scale when installed.
Dnsmasq is no longer a daemonset. It is now a deployment.
Kubedns is no longer a replicationcluster. It is now a deployment.
Minimum replicas is two (to enable rolling updates).

Reduced memory erquirements for dnsmasq and kubedns
This commit is contained in:
Matthew Mosesohn 2017-02-28 17:56:00 +03:00
parent 21d3d75827
commit 9cb12cf250
9 changed files with 141 additions and 27 deletions

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@ -25,4 +25,8 @@ dnsmasq_image_tag: "{{ dnsmasq_version }}"
dns_cpu_limit: 100m dns_cpu_limit: 100m
dns_memory_limit: 170Mi dns_memory_limit: 170Mi
dns_cpu_requests: 70m dns_cpu_requests: 70m
dns_memory_requests: 70Mi dns_memory_requests: 50Mi
# Autoscaler parameters
dnsmasq_nodes_per_replica: 10
dnsmasq_min_replicas: 1

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@ -1,4 +1,6 @@
--- ---
- include: pre_upgrade.yml
- name: ensure dnsmasq.d directory exists - name: ensure dnsmasq.d directory exists
file: file:
path: /etc/dnsmasq.d path: /etc/dnsmasq.d
@ -54,26 +56,15 @@
src: "{{item.file}}" src: "{{item.file}}"
dest: "{{kube_config_dir}}/{{item.file}}" dest: "{{kube_config_dir}}/{{item.file}}"
with_items: with_items:
- {file: dnsmasq-ds.yml, type: ds} - {name: dnsmasq, file: dnsmasq-deploy.yml, type: deployment}
- {file: dnsmasq-svc.yml, type: svc} - {name: dnsmasq, file: dnsmasq-svc.yml, type: svc}
- {name: dnsmasq-autoscaler, file: dnsmasq-autoscaler.yml, type: deployment}
register: manifests register: manifests
when: inventory_hostname == groups['kube-master'][0] when: inventory_hostname == groups['kube-master'][0]
#FIXME: remove manifests.changed condition if kubernetes/features#124 is implemented
- name: Delete existing dnsmasq daemonset
kube:
name: dnsmasq
namespace: "{{system_namespace}}"
kubectl: "{{bin_dir}}/kubectl"
resource: "ds"
filename: "{{kube_config_dir}}/{{item.item.file}}"
state: absent
with_items: "{{ manifests.results }}"
when: inventory_hostname == groups['kube-master'][0] and item.item.type == "ds" and (manifests.changed or dnsmasq_config.changed)
- name: Start Resources - name: Start Resources
kube: kube:
name: dnsmasq name: "{{item.item.name}}"
namespace: "{{system_namespace}}" namespace: "{{system_namespace}}"
kubectl: "{{bin_dir}}/kubectl" kubectl: "{{bin_dir}}/kubectl"
resource: "{{item.item.type}}" resource: "{{item.item.type}}"
@ -88,3 +79,4 @@
port: 53 port: 53
delay: 5 delay: 5
when: inventory_hostname == groups['kube-node'][0] when: inventory_hostname == groups['kube-node'][0]

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@ -0,0 +1,9 @@
---
- name: Delete legacy dnsmasq daemonset
kube:
name: dnsmasq
namespace: "{{system_namespace}}"
kubectl: "{{bin_dir}}/kubectl"
resource: "ds"
state: absent
when: inventory_hostname == groups['kube-master'][0]

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@ -0,0 +1,50 @@
# Copyright 2016 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: dnsmasq-autoscaler
namespace: kube-system
labels:
k8s-app: dnsmasq-autoscaler
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
spec:
template:
metadata:
labels:
k8s-app: dnsmasq-autoscaler
annotations:
scheduler.alpha.kubernetes.io/critical-pod: ''
scheduler.alpha.kubernetes.io/tolerations: '[{"key":"CriticalAddonsOnly", "operator":"Exists"}]'
spec:
containers:
- name: autoscaler
image: gcr.io/google_containers/cluster-proportional-autoscaler-amd64:1.1.1
resources:
requests:
cpu: "20m"
memory: "10Mi"
command:
- /cluster-proportional-autoscaler
- --namespace=kube-system
- --configmap=dnsmasq-autoscaler
- --target=ReplicationController/dnsmasq
# When cluster is using large nodes(with more cores), "coresPerReplica" should dominate.
# If using small nodes, "nodesPerReplica" should dominate.
- --default-params={"linear":{"nodesPerReplica":{{ dnsmasq_nodes_per_replica }},"preventSinglePointFailure":true}}
- --logtostderr=true
- --v={{ kube_log_level }}

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@ -1,16 +1,22 @@
--- ---
apiVersion: extensions/v1beta1 apiVersion: extensions/v1beta1
kind: DaemonSet kind: Deployment
metadata: metadata:
name: dnsmasq name: dnsmasq
namespace: "{{system_namespace}}" namespace: "{{system_namespace}}"
labels: labels:
k8s-app: dnsmasq k8s-app: dnsmasq
kubernetes.io/cluster-service: "true"
spec: spec:
replicas: {{ dnsmasq_min_replicas }}
selector:
matchLabels:
k8s-app: dnsmasq
template: template:
metadata: metadata:
labels: labels:
k8s-app: dnsmasq k8s-app: dnsmasq
kubernetes.io/cluster-service: "true"
spec: spec:
containers: containers:
- name: dnsmasq - name: dnsmasq
@ -55,3 +61,4 @@ spec:
hostPath: hostPath:
path: /etc/dnsmasq.d-available path: /etc/dnsmasq.d-available
dnsPolicy: Default # Don't use cluster DNS. dnsPolicy: Default # Don't use cluster DNS.

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@ -7,8 +7,9 @@ exechealthz_version: 1.1
dns_cpu_limit: 100m dns_cpu_limit: 100m
dns_memory_limit: 170Mi dns_memory_limit: 170Mi
dns_cpu_requests: 70m dns_cpu_requests: 70m
dns_memory_requests: 70Mi dns_memory_requests: 50Mi
dns_replicas: 1 kubedns_min_replicas: 1
kubedns_nodes_per_replica: 10
# Images # Images
kubedns_image_repo: "gcr.io/google_containers/kubedns-amd64" kubedns_image_repo: "gcr.io/google_containers/kubedns-amd64"

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@ -13,15 +13,16 @@
src: "{{item.file}}" src: "{{item.file}}"
dest: "{{kube_config_dir}}/{{item.file}}" dest: "{{kube_config_dir}}/{{item.file}}"
with_items: with_items:
- {file: kubedns-rc.yml, type: rc} - {name: kubedns, file: kubedns-deploy.yml, type: deployment}
- {file: kubedns-svc.yml, type: svc} - {name: kubedns, file: kubedns-svc.yml, type: svc}
- {name: kubedns-autoscaler, file: kubedns-autoscaler.yml, type: deployment}
register: manifests register: manifests
when: dns_mode != 'none' and inventory_hostname == groups['kube-master'][0] when: dns_mode != 'none' and inventory_hostname == groups['kube-master'][0]
tags: dnsmasq tags: dnsmasq
- name: Kubernetes Apps | Start Resources - name: Kubernetes Apps | Start Resources
kube: kube:
name: kubedns name: "{{item.item.name}}"
namespace: "{{ system_namespace }}" namespace: "{{ system_namespace }}"
kubectl: "{{bin_dir}}/kubectl" kubectl: "{{bin_dir}}/kubectl"
resource: "{{item.item.type}}" resource: "{{item.item.type}}"

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@ -0,0 +1,49 @@
# Copyright 2016 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: kubedns-autoscaler
namespace: kube-system
labels:
k8s-app: kubedns-autoscaler
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
spec:
template:
metadata:
labels:
k8s-app: kubedns-autoscaler
annotations:
scheduler.alpha.kubernetes.io/critical-pod: ''
scheduler.alpha.kubernetes.io/tolerations: '[{"key":"CriticalAddonsOnly", "operator":"Exists"}]'
spec:
containers:
- name: autoscaler
image: gcr.io/google_containers/cluster-proportional-autoscaler-amd64:1.1.1
resources:
requests:
cpu: "20m"
memory: "10Mi"
command:
- /cluster-proportional-autoscaler
- --namespace=kube-system
- --configmap=kubedns-autoscaler
# Should keep target in sync with cluster/addons/dns/kubedns-controller.yaml.base
- --target=replicationcontroller/kubedns
- --default-params={"linear":{"nodesPerReplica":{{ kubedns_nodes_per_replica }},"min":{{ kubedns_min_replicas }}}}
- --logtostderr=true
- --v=2

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@ -1,5 +1,5 @@
apiVersion: v1 apiVersion: extensions/v1beta1
kind: ReplicationController kind: Deployment
metadata: metadata:
name: kubedns name: kubedns
namespace: {{ system_namespace }} namespace: {{ system_namespace }}
@ -8,8 +8,9 @@ metadata:
version: v19 version: v19
kubernetes.io/cluster-service: "true" kubernetes.io/cluster-service: "true"
spec: spec:
replicas: {{ dns_replicas }} replicas: {{ kubedns_min_replicas }}
selector: selector:
matchLabels:
k8s-app: kubedns k8s-app: kubedns
version: v19 version: v19
template: template: