rpi.carlosedp.cluster-monitoring/modules/arm_exporter.jsonnet

local utils = import '../utils.libsonnet';
local k = import 'ksonnet/ksonnet.beta.4/k.libsonnet';

{
  _config+:: {
    namespace: 'monitoring',

    versions+:: {
      armExporter: 'latest',
    },

    imageRepos+:: {
      armExporter: 'carlosedp/arm_exporter',
    },
  },

  armExporter+:: {
    serviceAccount:
      utils.newServiceAccount('arm-exporter', $._config.namespace, null),

    clusterRole:
      utils.newClusterRole('arm-exporter', [
        {
          apis: ['authentication.k8s.io'],
          res: ['tokenreviews'],
          verbs: ['create'],
        },
        {
          apis: ['authorization.k8s.io'],
          res: ['subjectaccessreviews'],
          verbs: ['create'],
        },
      ], null),

    clusterRoleBinding:
      utils.newClusterRoleBinding('arm-exporter', 'arm-exporter', $._config.namespace, 'arm-exporter', null),

    daemonset:
      local daemonset = k.apps.v1.daemonSet;
      local container = daemonset.mixin.spec.template.spec.containersType;
      local containerPort = container.portsType;
      local containerEnv = container.envType;

      local podLabels = { 'k8s-app': 'arm-exporter' };

      local armExporter =
        container.new('arm-exporter', $._config.imageRepos.armExporter + ':' + $._config.versions.armExporter) +
        container.withCommand([
          '/bin/rpi_exporter',
          '--web.listen-address=127.0.0.1:9243',
        ]) +
        container.mixin.securityContext.withPrivileged(true) +
        container.mixin.resources.withRequests({ cpu: '50m', memory: '50Mi' }) +
        container.mixin.resources.withLimits({ cpu: '100m', memory: '100Mi' });

      local ip = containerEnv.fromFieldPath('IP', 'status.podIP');
      local proxy =
        container.new('kube-rbac-proxy', $._config.imageRepos.kubeRbacProxy + ':' + $._config.versions.kubeRbacProxy) +
        container.withArgs([
          '--secure-listen-address=$(IP):9243',
          '--upstream=http://127.0.0.1:9243/',
          '--tls-cipher-suites=' + std.join(',', $._config.tlsCipherSuites),
        ]) +
        container.withPorts(containerPort.new(9243) + containerPort.withHostPort(9243) + containerPort.withName('https')) +
        container.mixin.resources.withRequests({ cpu: '10m', memory: '20Mi' }) +
        container.mixin.resources.withLimits({ cpu: '20m', memory: '40Mi' }) +
        container.withEnv([ip]);
      local c = [armExporter, proxy];

      daemonset.new() +
      daemonset.mixin.metadata.withName('arm-exporter') +
      daemonset.mixin.metadata.withNamespace($._config.namespace) +
      daemonset.mixin.metadata.withLabels(podLabels) +
      daemonset.mixin.spec.selector.withMatchLabels(podLabels) +
      daemonset.mixin.spec.template.metadata.withLabels(podLabels) +
      daemonset.mixin.spec.template.spec.affinity.nodeAffinity.requiredDuringSchedulingIgnoredDuringExecution.withNodeSelectorTerms([{ matchExpressions: [{ key: 'kubernetes.io/arch', operator: 'In', values: ['arm', 'arm64'] }] }]) +
      daemonset.mixin.spec.template.spec.withTolerations([{ operator: 'Exists' }]) +
      daemonset.mixin.spec.template.spec.withServiceAccountName('arm-exporter') +
      daemonset.mixin.spec.template.spec.withContainers(c),

    service:
      local service = k.core.v1.service;
      local servicePort = k.core.v1.service.mixin.spec.portsType;

      local armExporterPort = servicePort.newNamed('https', 9243, 'https');

      service.new('arm-exporter', $.armExporter.daemonset.spec.selector.matchLabels, armExporterPort) +
      service.mixin.metadata.withNamespace($._config.namespace) +
      service.mixin.metadata.withLabels({ 'k8s-app': 'arm-exporter' }) +
      service.mixin.spec.withClusterIp('None'),

    serviceMonitor:
      utils.newServiceMonitorHTTPS(
        'arm-exporter',
        $._config.namespace,
        { 'k8s-app': 'arm-exporter' },
        $._config.namespace,
        'https',
        'https',
        '/var/run/secrets/kubernetes.io/serviceaccount/token',
      ),
  },
}