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node-local-ha.yaml
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---
apiVersion: v1
kind: ServiceAccount
metadata:
name: coredns-nodecache
namespace: kube-system
labels:
kubernetes.io/cluster-service: "true"
---
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns-nodecache-primary
namespace: kube-system
data:
Corefile: |
cluster.local:53 {
errors
cache {
success 9984 30
denial 9984 5
prefetch 3 60s 15%
}
reload
loop
bind 169.254.20.10 # Set your cluster dns to this
nodecache skipteardown
template IN AAAA {
rcode NOERROR
}
forward . 100.64.0.10 { # Kube-DNS IP
force_tcp
}
prometheus :9253
health 169.254.20.10:8080
}
in-addr.arpa:53 {
errors
cache 120
reload
loop
bind 169.254.20.10
nodecache skipteardown
template IN AAAA {
rcode NOERROR
}
forward . /etc/resolv.conf {
force_tcp
}
prometheus :9253
}
.:53 {
errors
cache {
prefetch 3 60s 15%
}
reload
loop
bind 169.254.20.10
nodecache skipteardown
template IN AAAA {
rcode NOERROR
}
forward . /etc/resolv.conf {
force_tcp
}
prometheus :9253
}
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: coredns-nodecache-primary
namespace: kube-system
labels:
k8s-app: coredns-nodecache
kubernetes.io/cluster-service: "true"
spec:
updateStrategy:
rollingUpdate:
maxUnavailable: 10%
selector:
matchLabels:
k8s-app: coredns-nodecache
template:
metadata:
labels:
k8s-app: coredns-nodecache
spec:
priorityClassName: system-node-critical
serviceAccountName: coredns-nodecache
hostNetwork: true
dnsPolicy: Default
tolerations:
- key: CriticalAddonsOnly
operator: Exists
- key: node-role.kubernetes.io/master
effect: NoSchedule
containers:
- name: coredns-nodecache
image: contentful/coredns-nodecache:latest
resources:
limits:
memory: 50Mi
requests:
cpu: 25m
memory: 5Mi
args:
- -conf
- /etc/coredns/Corefile
securityContext:
privileged: true
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9253
name: metrics
protocol: TCP
livenessProbe:
httpGet:
host: 169.254.20.10
path: /health
port: 8080
initialDelaySeconds: 60
timeoutSeconds: 5
volumeMounts:
- mountPath: /run/xtables.lock
name: xtables-lock
readOnly: false
- name: config-volume
mountPath: /etc/coredns
volumes:
- name: xtables-lock
hostPath:
path: /run/xtables.lock
type: FileOrCreate
- name: config-volume
configMap:
name: coredns-nodecache-primary
items:
- key: Corefile
path: Corefile
---
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns-nodecache-secondary
namespace: kube-system
data:
Corefile: |
cluster.local:53 {
errors
cache {
success 9984 30
denial 9984 5
prefetch 3 60s 15%
}
reload
loop
bind 169.254.20.10 # Set your cluster dns to this
template IN AAAA {
rcode NOERROR
}
forward . 100.64.0.10 { # Kube-DNS IP
force_tcp
}
prometheus :9254
health 169.254.20.10:8082
}
in-addr.arpa:53 {
errors
cache 120
reload
loop
bind 169.254.20.10
template IN AAAA {
rcode NOERROR
}
forward . /etc/resolv.conf {
force_tcp
}
prometheus :9254
}
.:53 {
errors
cache {
prefetch 3 60s 15%
}
reload
loop
bind 169.254.20.10
template IN AAAA {
rcode NOERROR
}
forward . /etc/resolv.conf {
force_tcp
}
prometheus :9254
}
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: coredns-nodecache-secondary
namespace: kube-system
labels:
k8s-app: coredns-nodecache
kubernetes.io/cluster-service: "true"
spec:
updateStrategy:
rollingUpdate:
maxUnavailable: 10%
selector:
matchLabels:
k8s-app: coredns-nodecache
template:
metadata:
labels:
k8s-app: coredns-nodecache
spec:
priorityClassName: system-node-critical
serviceAccountName: coredns-nodecache
hostNetwork: true
dnsPolicy: Default
tolerations:
- key: CriticalAddonsOnly
operator: Exists
- key: node-role.kubernetes.io/master
effect: NoSchedule
containers:
- name: coredns-nodecache
image: contentful/coredns-nodecache:latest
resources:
limits:
memory: 50Mi
requests:
cpu: 25m
memory: 5Mi
args:
- -conf
- /etc/coredns/Corefile
securityContext:
privileged: true
ports:
- containerPort: 9254
name: metrics
protocol: TCP
livenessProbe:
httpGet:
host: 169.254.20.10
path: /health
port: 8082
initialDelaySeconds: 60
timeoutSeconds: 5
volumeMounts:
- mountPath: /run/xtables.lock
name: xtables-lock
readOnly: false
- name: config-volume
mountPath: /etc/coredns
volumes:
- name: xtables-lock
hostPath:
path: /run/xtables.lock
type: FileOrCreate
- name: config-volume
configMap:
name: coredns-nodecache-secondary
items:
- key: Corefile
path: Corefile