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", |
Sergiusz Bazanski | 54490d3 | 2019-10-02 20:47:18 +0200 | [diff] [blame] | 13 | cluster_domains: [ |
| 14 | "cluster.local", |
| 15 | ], |
Sergiusz Bazanski | 49b9a13 | 2019-01-14 00:02:59 +0100 | [diff] [blame] | 16 | reverse_cidrs: ["in-addr.arpa", "ip6.arpa"], |
| 17 | clusterIP: "10.10.12.254", |
| 18 | }, |
| 19 | |
| 20 | sa: kube.ServiceAccount("coredns") { |
| 21 | metadata+: { |
| 22 | namespace: cfg.namespace, |
| 23 | }, |
| 24 | }, |
| 25 | |
| 26 | cr: kube.ClusterRole("system:coredns") { |
| 27 | metadata+: { |
| 28 | labels: { |
| 29 | "kubernetes.io/bootstrapping": "rbac-defaults", |
| 30 | }, |
| 31 | }, |
| 32 | rules: [ |
| 33 | { |
| 34 | apiGroups: [""], |
| 35 | resources: ["endpoints", "services", "pods", "namespaces"], |
| 36 | verbs: ["list", "watch"], |
| 37 | }, |
| 38 | { |
| 39 | apiGroups: [""], |
| 40 | resources: ["nodes"], |
| 41 | verbs: ["get"], |
| 42 | }, |
| 43 | ], |
| 44 | }, |
| 45 | |
| 46 | crb: kube.ClusterRoleBinding("system:coredns") { |
| 47 | metadata+: { |
| 48 | labels: { |
| 49 | "kubernetes.io/bootstrapping": "rbac-defaults", |
| 50 | }, |
| 51 | annotations+: { |
| 52 | "rbac.authorization.kubernetes.io/autoupdate": "true", |
| 53 | }, |
| 54 | }, |
| 55 | roleRef: { |
| 56 | apiGroup: "rbac.authorization.k8s.io", |
| 57 | kind: "ClusterRole", |
| 58 | name: env.cr.metadata.name, |
| 59 | }, |
| 60 | subjects: [ |
| 61 | { |
| 62 | kind: "ServiceAccount", |
| 63 | name: env.sa.metadata.name, |
| 64 | namespace: env.sa.metadata.namespace, |
| 65 | }, |
| 66 | ], |
| 67 | }, |
| 68 | |
| 69 | cm: kube.ConfigMap("coredns") { |
| 70 | local map = self, |
| 71 | |
| 72 | upstream_server:: cfg.upstream_server, |
Sergiusz Bazanski | 54490d3 | 2019-10-02 20:47:18 +0200 | [diff] [blame] | 73 | cluster_domains:: std.join(" ", cfg.cluster_domains), |
Sergiusz Bazanski | 49b9a13 | 2019-01-14 00:02:59 +0100 | [diff] [blame] | 74 | reverse_cidrs:: std.join(" ", cfg.reverse_cidrs), |
| 75 | |
| 76 | metadata+: { |
| 77 | namespace: cfg.namespace, |
| 78 | }, |
| 79 | data: { |
| 80 | Corefile: ||| |
| 81 | .:53 { |
| 82 | log |
| 83 | errors |
| 84 | health |
| 85 | kubernetes %s %s { |
| 86 | pods insecure |
| 87 | upstream |
| 88 | fallthrough in-addr.arpa ip6.arpa |
| 89 | } |
Sergiusz Bazanski | 5c75574 | 2019-01-17 21:35:10 +0100 | [diff] [blame] | 90 | rewrite name suffix .svc.k0.hswaw.net .svc.cluster.local |
Sergiusz Bazanski | 49b9a13 | 2019-01-14 00:02:59 +0100 | [diff] [blame] | 91 | prometheus :9153 |
| 92 | proxy . %s |
| 93 | cache 30 |
| 94 | loop |
| 95 | reload |
| 96 | loadbalance |
| 97 | } |
Sergiusz Bazanski | 54490d3 | 2019-10-02 20:47:18 +0200 | [diff] [blame] | 98 | ||| % [map.cluster_domains, map.reverse_cidrs, map.upstream_server] |
Sergiusz Bazanski | 49b9a13 | 2019-01-14 00:02:59 +0100 | [diff] [blame] | 99 | }, |
| 100 | }, |
| 101 | |
| 102 | deployment: kube.Deployment("coredns") { |
| 103 | metadata+: { |
| 104 | namespace: cfg.namespace, |
| 105 | labels+: { |
| 106 | "k8s-app": "coredns", |
| 107 | }, |
| 108 | }, |
| 109 | spec+: { |
| 110 | replicas: 2, |
| 111 | strategy: { |
| 112 | type: "RollingUpdate", |
| 113 | rollingUpdate: { maxUnavailable: 1 }, |
| 114 | }, |
| 115 | template+: { |
| 116 | spec+: { |
| 117 | serviceAccountName: env.sa.metadata.name, |
| 118 | tolerations: [ |
| 119 | { key: "CriticalAddonsOnly", operator: "Exists" }, |
| 120 | ], |
| 121 | dnsPolicy: "Default", |
| 122 | volumes_: { |
| 123 | config: { |
| 124 | configMap: { |
| 125 | name: env.cm.metadata.name, |
| 126 | items: [ { key: "Corefile", path: "Corefile" } ], |
| 127 | }, |
| 128 | }, |
| 129 | }, |
| 130 | containers_: { |
| 131 | coredns: kube.Container("coredns") { |
| 132 | local container = self, |
| 133 | |
| 134 | image: cfg.image, |
| 135 | args: [ |
| 136 | "-conf", "%s/Corefile" % container.volumeMounts[0].mountPath, |
| 137 | ], |
| 138 | imagePullPolicy: "IfNotPresent", |
| 139 | resources: { |
| 140 | limits: { memory: "170Mi" }, |
| 141 | requests: { memory: "70Mi", cpu: "100m" }, |
| 142 | }, |
| 143 | volumeMounts_: { |
| 144 | config: { |
| 145 | mountPath: "/etc/coredns", |
| 146 | }, |
| 147 | }, |
| 148 | ports_: { |
| 149 | dns: { |
| 150 | containerPort: 53, |
| 151 | protocol: "UDP", |
| 152 | }, |
| 153 | "dns-tcp": { |
| 154 | containerPort: 53, |
| 155 | protocol: "TCP", |
| 156 | }, |
| 157 | metrics: { |
| 158 | containerPort: 9153, |
| 159 | protocol: "TCP", |
| 160 | }, |
| 161 | }, |
| 162 | securityContext: { |
| 163 | allowPrivilegeEscalation: false, |
| 164 | capabilities: { |
| 165 | add: ["NET_BIND_SERVICE"], |
| 166 | drop: ["all"], |
| 167 | }, |
| 168 | readOnlyRootFilesystem: true, |
| 169 | }, |
| 170 | livenessProbe: { |
| 171 | httpGet: { |
| 172 | path: "/health", |
| 173 | port: 8080, |
| 174 | scheme: "HTTP", |
| 175 | }, |
| 176 | initialDelaySeconds: 60, |
| 177 | timeoutSeconds: 5, |
| 178 | successThreshold: 1, |
| 179 | failureThreshold: 5, |
| 180 | }, |
| 181 | }, |
| 182 | }, |
| 183 | }, |
| 184 | }, |
| 185 | }, |
| 186 | }, |
| 187 | svc: kube.Service("coredns") { |
| 188 | local svc = self, |
| 189 | metadata+: { |
| 190 | namespace: cfg.namespace, |
| 191 | }, |
| 192 | target_pod: env.deployment.spec.template, |
| 193 | spec+: { |
| 194 | ports: [ { name: p.name, port: p.containerPort, protocol: p.protocol } for p in svc.target_pod.spec.containers[0].ports ], |
| 195 | clusterIP: cfg.clusterIP, |
| 196 | }, |
| 197 | }, |
| 198 | }, |
| 199 | } |