Sergiusz Bazanski | 49b9a13 | 2019-01-14 00:02:59 +0100 | [diff] [blame] | 1 | # Deploy a per-cluster CoreDNS |
| 2 | |
| 3 | local kube = import "../../../kube/kube.libsonnet"; |
| 4 | |
| 5 | { |
| 6 | Environment: { |
| 7 | local env = self, |
| 8 | local cfg = env.cfg, |
| 9 | cfg:: { |
| 10 | image: "coredns/coredns:1.3.0", |
| 11 | namespace: "kube-system", |
| 12 | upstream_server: "185.236.240.1", |
| 13 | cluster_domain: "cluster.local", |
| 14 | reverse_cidrs: ["in-addr.arpa", "ip6.arpa"], |
| 15 | clusterIP: "10.10.12.254", |
| 16 | }, |
| 17 | |
| 18 | sa: kube.ServiceAccount("coredns") { |
| 19 | metadata+: { |
| 20 | namespace: cfg.namespace, |
| 21 | }, |
| 22 | }, |
| 23 | |
| 24 | cr: kube.ClusterRole("system:coredns") { |
| 25 | metadata+: { |
| 26 | labels: { |
| 27 | "kubernetes.io/bootstrapping": "rbac-defaults", |
| 28 | }, |
| 29 | }, |
| 30 | rules: [ |
| 31 | { |
| 32 | apiGroups: [""], |
| 33 | resources: ["endpoints", "services", "pods", "namespaces"], |
| 34 | verbs: ["list", "watch"], |
| 35 | }, |
| 36 | { |
| 37 | apiGroups: [""], |
| 38 | resources: ["nodes"], |
| 39 | verbs: ["get"], |
| 40 | }, |
| 41 | ], |
| 42 | }, |
| 43 | |
| 44 | crb: kube.ClusterRoleBinding("system:coredns") { |
| 45 | metadata+: { |
| 46 | labels: { |
| 47 | "kubernetes.io/bootstrapping": "rbac-defaults", |
| 48 | }, |
| 49 | annotations+: { |
| 50 | "rbac.authorization.kubernetes.io/autoupdate": "true", |
| 51 | }, |
| 52 | }, |
| 53 | roleRef: { |
| 54 | apiGroup: "rbac.authorization.k8s.io", |
| 55 | kind: "ClusterRole", |
| 56 | name: env.cr.metadata.name, |
| 57 | }, |
| 58 | subjects: [ |
| 59 | { |
| 60 | kind: "ServiceAccount", |
| 61 | name: env.sa.metadata.name, |
| 62 | namespace: env.sa.metadata.namespace, |
| 63 | }, |
| 64 | ], |
| 65 | }, |
| 66 | |
| 67 | cm: kube.ConfigMap("coredns") { |
| 68 | local map = self, |
| 69 | |
| 70 | upstream_server:: cfg.upstream_server, |
| 71 | cluster_domain:: cfg.cluster_domain, |
| 72 | reverse_cidrs:: std.join(" ", cfg.reverse_cidrs), |
| 73 | |
| 74 | metadata+: { |
| 75 | namespace: cfg.namespace, |
| 76 | }, |
| 77 | data: { |
| 78 | Corefile: ||| |
| 79 | .:53 { |
| 80 | log |
| 81 | errors |
| 82 | health |
| 83 | kubernetes %s %s { |
| 84 | pods insecure |
| 85 | upstream |
| 86 | fallthrough in-addr.arpa ip6.arpa |
| 87 | } |
Sergiusz Bazanski | 5c75574 | 2019-01-17 21:35:10 +0100 | [diff] [blame] | 88 | rewrite name suffix .svc.k0.hswaw.net .svc.cluster.local |
Sergiusz Bazanski | 49b9a13 | 2019-01-14 00:02:59 +0100 | [diff] [blame] | 89 | prometheus :9153 |
| 90 | proxy . %s |
| 91 | cache 30 |
| 92 | loop |
| 93 | reload |
| 94 | loadbalance |
| 95 | } |
| 96 | ||| % [map.cluster_domain, map.reverse_cidrs, map.upstream_server] |
| 97 | }, |
| 98 | }, |
| 99 | |
| 100 | deployment: kube.Deployment("coredns") { |
| 101 | metadata+: { |
| 102 | namespace: cfg.namespace, |
| 103 | labels+: { |
| 104 | "k8s-app": "coredns", |
| 105 | }, |
| 106 | }, |
| 107 | spec+: { |
| 108 | replicas: 2, |
| 109 | strategy: { |
| 110 | type: "RollingUpdate", |
| 111 | rollingUpdate: { maxUnavailable: 1 }, |
| 112 | }, |
| 113 | template+: { |
| 114 | spec+: { |
| 115 | serviceAccountName: env.sa.metadata.name, |
| 116 | tolerations: [ |
| 117 | { key: "CriticalAddonsOnly", operator: "Exists" }, |
| 118 | ], |
| 119 | dnsPolicy: "Default", |
| 120 | volumes_: { |
| 121 | config: { |
| 122 | configMap: { |
| 123 | name: env.cm.metadata.name, |
| 124 | items: [ { key: "Corefile", path: "Corefile" } ], |
| 125 | }, |
| 126 | }, |
| 127 | }, |
| 128 | containers_: { |
| 129 | coredns: kube.Container("coredns") { |
| 130 | local container = self, |
| 131 | |
| 132 | image: cfg.image, |
| 133 | args: [ |
| 134 | "-conf", "%s/Corefile" % container.volumeMounts[0].mountPath, |
| 135 | ], |
| 136 | imagePullPolicy: "IfNotPresent", |
| 137 | resources: { |
| 138 | limits: { memory: "170Mi" }, |
| 139 | requests: { memory: "70Mi", cpu: "100m" }, |
| 140 | }, |
| 141 | volumeMounts_: { |
| 142 | config: { |
| 143 | mountPath: "/etc/coredns", |
| 144 | }, |
| 145 | }, |
| 146 | ports_: { |
| 147 | dns: { |
| 148 | containerPort: 53, |
| 149 | protocol: "UDP", |
| 150 | }, |
| 151 | "dns-tcp": { |
| 152 | containerPort: 53, |
| 153 | protocol: "TCP", |
| 154 | }, |
| 155 | metrics: { |
| 156 | containerPort: 9153, |
| 157 | protocol: "TCP", |
| 158 | }, |
| 159 | }, |
| 160 | securityContext: { |
| 161 | allowPrivilegeEscalation: false, |
| 162 | capabilities: { |
| 163 | add: ["NET_BIND_SERVICE"], |
| 164 | drop: ["all"], |
| 165 | }, |
| 166 | readOnlyRootFilesystem: true, |
| 167 | }, |
| 168 | livenessProbe: { |
| 169 | httpGet: { |
| 170 | path: "/health", |
| 171 | port: 8080, |
| 172 | scheme: "HTTP", |
| 173 | }, |
| 174 | initialDelaySeconds: 60, |
| 175 | timeoutSeconds: 5, |
| 176 | successThreshold: 1, |
| 177 | failureThreshold: 5, |
| 178 | }, |
| 179 | }, |
| 180 | }, |
| 181 | }, |
| 182 | }, |
| 183 | }, |
| 184 | }, |
| 185 | svc: kube.Service("coredns") { |
| 186 | local svc = self, |
| 187 | metadata+: { |
| 188 | namespace: cfg.namespace, |
| 189 | }, |
| 190 | target_pod: env.deployment.spec.template, |
| 191 | spec+: { |
| 192 | ports: [ { name: p.name, port: p.containerPort, protocol: p.protocol } for p in svc.target_pod.spec.containers[0].ports ], |
| 193 | clusterIP: cfg.clusterIP, |
| 194 | }, |
| 195 | }, |
| 196 | }, |
| 197 | } |