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[local-preview] Support
127-0-0-1.nip.io
for DOMAIN
Due to the way docker works in non-native platforms, It is very hard to have a consistent experience across all platforms as we can't just use the [docker bridge netwrok IP's in non-native platforms](https://docs.docker.com/desktop/networking/). This means that users have to search their Host IP, and use It to get up and working [which we tried, but understand that it's not a good UX](https://github.com/gitpod-io/website/pull/2349). But users can use `127-0-0-1.nip.io` as the DOMAIN which resolves to `127.0.0.1` and is available in all platforms as its `localhost`. This works well and good for all user communication but internal communication fails as `127-0-0-1.nip.io` for them is something else. So, This PR fixes that by adding new coredns `gitpod.db` coredns config essentially asking to route all `127-0-0-1.nip.io` to `proxy.default.svc.cluster.local`. [As k3s does not yet support overriding coredns config in a sane-way](k3s-io/k3s#462) ,We instead skip the default coredns by adding `coredns.yaml.skip` file, and adding our own `custom-coredns.yaml` which is just plain `coredns.yaml` that comes with `k3s`, added with gitpod config. Signed-off-by: Tarun Pothulapati <tarun@gitpod.io>
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# Copyright (c) 2022 Gitpod GmbH. All rights reserved. | ||
# Licensed under the MIT License. See License-MIT.txt in the project root for license information. | ||
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apiVersion: v1 | ||
kind: ServiceAccount | ||
metadata: | ||
name: coredns | ||
namespace: kube-system | ||
--- | ||
apiVersion: rbac.authorization.k8s.io/v1beta1 | ||
kind: ClusterRole | ||
metadata: | ||
labels: | ||
kubernetes.io/bootstrapping: rbac-defaults | ||
name: system:coredns | ||
rules: | ||
- apiGroups: | ||
- "" | ||
resources: | ||
- endpoints | ||
- services | ||
- pods | ||
- namespaces | ||
verbs: | ||
- list | ||
- watch | ||
- apiGroups: | ||
- discovery.k8s.io | ||
resources: | ||
- endpointslices | ||
verbs: | ||
- list | ||
- watch | ||
--- | ||
apiVersion: rbac.authorization.k8s.io/v1beta1 | ||
kind: ClusterRoleBinding | ||
metadata: | ||
annotations: | ||
rbac.authorization.kubernetes.io/autoupdate: "true" | ||
labels: | ||
kubernetes.io/bootstrapping: rbac-defaults | ||
name: system:coredns | ||
roleRef: | ||
apiGroup: rbac.authorization.k8s.io | ||
kind: ClusterRole | ||
name: system:coredns | ||
subjects: | ||
- kind: ServiceAccount | ||
name: coredns | ||
namespace: kube-system | ||
--- | ||
apiVersion: v1 | ||
kind: ConfigMap | ||
metadata: | ||
name: coredns | ||
namespace: kube-system | ||
data: | ||
gitpod.db: | | ||
; 127-0-0-1.nip.io test file | ||
127-0-0-1.nip.io. IN SOA sns.dns.icann.org. noc.dns.icann.org. 2015082541 7200 3600 1209600 3600 | ||
127-0-0-1.nip.io. IN CNAME proxy.default.svc.cluster.local. | ||
*.127-0-0-1.nip.io. IN CNAME proxy.default.svc.cluster.local. | ||
*.ws.127-0-0-1.nip.io. IN CNAME proxy.default.svc.cluster.local. | ||
Corefile: | | ||
.:53 { | ||
errors | ||
health | ||
ready | ||
# extra configuration for `127-0-0-1.nip.io` | ||
file /etc/coredns/gitpod.db 127-0-0-1.nip.io | ||
kubernetes cluster.local in-addr.arpa ip6.arpa { | ||
pods insecure | ||
fallthrough in-addr.arpa ip6.arpa | ||
} | ||
hosts /etc/coredns/NodeHosts { | ||
ttl 60 | ||
reload 15s | ||
fallthrough | ||
} | ||
prometheus :9153 | ||
forward . /etc/resolv.conf | ||
cache 30 | ||
loop | ||
reload | ||
loadbalance | ||
} | ||
--- | ||
apiVersion: apps/v1 | ||
kind: Deployment | ||
metadata: | ||
name: coredns | ||
namespace: kube-system | ||
labels: | ||
k8s-app: kube-dns | ||
kubernetes.io/name: "CoreDNS" | ||
spec: | ||
#replicas: 1 | ||
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: "node-role.kubernetes.io/control-plane" | ||
operator: "Exists" | ||
effect: "NoSchedule" | ||
- key: "node-role.kubernetes.io/master" | ||
operator: "Exists" | ||
effect: "NoSchedule" | ||
nodeSelector: | ||
beta.kubernetes.io/os: linux | ||
containers: | ||
- name: coredns | ||
image: rancher/mirrored-coredns-coredns:1.9.1 | ||
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 | ||
securityContext: | ||
allowPrivilegeEscalation: false | ||
capabilities: | ||
add: | ||
- NET_BIND_SERVICE | ||
drop: | ||
- all | ||
readOnlyRootFilesystem: true | ||
livenessProbe: | ||
httpGet: | ||
path: /health | ||
port: 8080 | ||
scheme: HTTP | ||
initialDelaySeconds: 60 | ||
periodSeconds: 10 | ||
timeoutSeconds: 1 | ||
successThreshold: 1 | ||
failureThreshold: 3 | ||
readinessProbe: | ||
httpGet: | ||
path: /ready | ||
port: 8181 | ||
scheme: HTTP | ||
initialDelaySeconds: 0 | ||
periodSeconds: 2 | ||
timeoutSeconds: 1 | ||
successThreshold: 1 | ||
failureThreshold: 3 | ||
dnsPolicy: Default | ||
volumes: | ||
- name: config-volume | ||
configMap: | ||
name: coredns | ||
items: | ||
- key: gitpod.db | ||
path: gitpod.db | ||
- key: Corefile | ||
path: Corefile | ||
- key: NodeHosts | ||
path: NodeHosts | ||
--- | ||
apiVersion: v1 | ||
kind: Service | ||
metadata: | ||
name: kube-dns | ||
namespace: kube-system | ||
annotations: | ||
prometheus.io/port: "9153" | ||
prometheus.io/scrape: "true" | ||
labels: | ||
k8s-app: kube-dns | ||
kubernetes.io/cluster-service: "true" | ||
kubernetes.io/name: "CoreDNS" | ||
spec: | ||
selector: | ||
k8s-app: kube-dns | ||
clusterIP: 10.43.0.10 | ||
ports: | ||
- name: dns | ||
port: 53 | ||
protocol: UDP | ||
- name: dns-tcp | ||
port: 53 | ||
protocol: TCP | ||
- name: metrics | ||
port: 9153 | ||
protocol: TCP |