/
manifests.go
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/
manifests.go
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/*
Copyright 2017 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.
*/
package dns
const (
// CoreDNSService is the CoreDNS Service manifest
CoreDNSService = `
apiVersion: v1
kind: Service
metadata:
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
kubernetes.io/name: "CoreDNS"
name: kube-dns
namespace: kube-system
annotations:
prometheus.io/port: "9153"
prometheus.io/scrape: "true"
# Without this resourceVersion value, an update of the Service between versions will yield:
# Service "kube-dns" is invalid: metadata.resourceVersion: Invalid value: "": must be specified for an update
resourceVersion: "0"
spec:
clusterIP: {{ .DNSIP }}
ports:
- name: dns
port: 53
protocol: UDP
targetPort: 53
- name: dns-tcp
port: 53
protocol: TCP
targetPort: 53
- name: metrics
port: 9153
protocol: TCP
targetPort: 9153
selector:
k8s-app: kube-dns
`
// CoreDNSDeployment is the CoreDNS Deployment manifest
CoreDNSDeployment = `
apiVersion: apps/v1
kind: Deployment
metadata:
name: {{ .DeploymentName }}
namespace: kube-system
labels:
k8s-app: kube-dns
spec:
replicas: {{ .Replicas }}
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
spec:
priorityClassName: system-cluster-critical
serviceAccountName: coredns
tolerations:
- key: CriticalAddonsOnly
operator: Exists
- key: {{ .OldControlPlaneTaintKey }}
effect: NoSchedule
- key: {{ .ControlPlaneTaintKey }}
effect: NoSchedule
nodeSelector:
kubernetes.io/os: linux
containers:
- name: coredns
image: {{ .Image }}
imagePullPolicy: IfNotPresent
resources:
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
readOnly: true
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9153
name: metrics
protocol: TCP
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /ready
port: 8181
scheme: HTTP
securityContext:
allowPrivilegeEscalation: false
capabilities:
add:
- NET_BIND_SERVICE
drop:
- all
readOnlyRootFilesystem: true
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile
`
// CoreDNSConfigMap is the CoreDNS ConfigMap manifest
CoreDNSConfigMap = `
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
data:
Corefile: |
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes {{ .DNSDomain }} in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
`
// CoreDNSClusterRole is the CoreDNS ClusterRole manifest
CoreDNSClusterRole = `
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: system:coredns
rules:
- apiGroups:
- ""
resources:
- endpoints
- services
- pods
- namespaces
verbs:
- list
- watch
- apiGroups:
- ""
resources:
- nodes
verbs:
- get
- apiGroups:
- discovery.k8s.io
resources:
- endpointslices
verbs:
- list
- watch
`
// CoreDNSClusterRoleBinding is the CoreDNS Clusterrolebinding manifest
CoreDNSClusterRoleBinding = `
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: system:coredns
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:coredns
subjects:
- kind: ServiceAccount
name: coredns
namespace: kube-system
`
// CoreDNSServiceAccount is the CoreDNS ServiceAccount manifest
CoreDNSServiceAccount = `
apiVersion: v1
kind: ServiceAccount
metadata:
name: coredns
namespace: kube-system
`
)