415 lines
13 KiB
Go
415 lines
13 KiB
Go
package controller
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import (
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"fmt"
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"os"
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"sync"
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"github.com/sirupsen/logrus"
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v1 "k8s.io/api/core/v1"
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rbacv1 "k8s.io/api/rbac/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/client-go/kubernetes/scheme"
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"k8s.io/client-go/tools/cache"
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"github.com/zalando/postgres-operator/pkg/apiserver"
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"github.com/zalando/postgres-operator/pkg/cluster"
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"github.com/zalando/postgres-operator/pkg/spec"
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"github.com/zalando/postgres-operator/pkg/util"
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"github.com/zalando/postgres-operator/pkg/util/config"
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"github.com/zalando/postgres-operator/pkg/util/constants"
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"github.com/zalando/postgres-operator/pkg/util/k8sutil"
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"github.com/zalando/postgres-operator/pkg/util/ringlog"
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acidv1informer "github.com/zalando/postgres-operator/pkg/generated/informers/externalversions/acid.zalan.do/v1"
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)
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// Controller represents operator controller
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type Controller struct {
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config spec.ControllerConfig
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opConfig *config.Config
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logger *logrus.Entry
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KubeClient k8sutil.KubernetesClient
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apiserver *apiserver.Server
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stopCh chan struct{}
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curWorkerID uint32 //initialized with 0
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curWorkerCluster sync.Map
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clusterWorkers map[spec.NamespacedName]uint32
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clustersMu sync.RWMutex
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clusters map[spec.NamespacedName]*cluster.Cluster
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clusterLogs map[spec.NamespacedName]ringlog.RingLogger
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clusterHistory map[spec.NamespacedName]ringlog.RingLogger // history of the cluster changes
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teamClusters map[string][]spec.NamespacedName
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postgresqlInformer cache.SharedIndexInformer
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podInformer cache.SharedIndexInformer
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nodesInformer cache.SharedIndexInformer
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podCh chan cluster.PodEvent
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clusterEventQueues []*cache.FIFO // [workerID]Queue
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lastClusterSyncTime int64
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lastClusterRepairTime int64
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workerLogs map[uint32]ringlog.RingLogger
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PodServiceAccount *v1.ServiceAccount
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PodServiceAccountRoleBinding *rbacv1.RoleBinding
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}
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// NewController creates a new controller
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func NewController(controllerConfig *spec.ControllerConfig) *Controller {
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logger := logrus.New()
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c := &Controller{
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config: *controllerConfig,
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opConfig: &config.Config{},
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logger: logger.WithField("pkg", "controller"),
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curWorkerCluster: sync.Map{},
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clusterWorkers: make(map[spec.NamespacedName]uint32),
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clusters: make(map[spec.NamespacedName]*cluster.Cluster),
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clusterLogs: make(map[spec.NamespacedName]ringlog.RingLogger),
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clusterHistory: make(map[spec.NamespacedName]ringlog.RingLogger),
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teamClusters: make(map[string][]spec.NamespacedName),
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stopCh: make(chan struct{}),
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podCh: make(chan cluster.PodEvent),
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}
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logger.Hooks.Add(c)
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return c
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}
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func (c *Controller) initClients() {
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var err error
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c.KubeClient, err = k8sutil.NewFromConfig(c.config.RestConfig)
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if err != nil {
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c.logger.Fatalf("could not create kubernetes clients: %v", err)
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}
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}
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func (c *Controller) initOperatorConfig() {
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configMapData := make(map[string]string)
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if c.config.ConfigMapName != (spec.NamespacedName{}) {
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configMap, err := c.KubeClient.ConfigMaps(c.config.ConfigMapName.Namespace).
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Get(c.config.ConfigMapName.Name, metav1.GetOptions{})
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if err != nil {
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panic(err)
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}
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configMapData = configMap.Data
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} else {
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c.logger.Infoln("no ConfigMap specified. Loading default values")
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}
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c.opConfig = config.NewFromMap(configMapData)
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c.warnOnDeprecatedOperatorParameters()
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if c.opConfig.SetMemoryRequestToLimit {
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isSmaller, err := util.IsSmallerQuantity(c.opConfig.DefaultMemoryRequest, c.opConfig.DefaultMemoryLimit)
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if err != nil {
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panic(err)
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}
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if isSmaller {
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c.logger.Warningf("The default memory request of %v for Postgres containers is increased to match the default memory limit of %v.", c.opConfig.DefaultMemoryRequest, c.opConfig.DefaultMemoryLimit)
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c.opConfig.DefaultMemoryRequest = c.opConfig.DefaultMemoryLimit
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}
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isSmaller, err = util.IsSmallerQuantity(c.opConfig.ScalyrMemoryRequest, c.opConfig.ScalyrMemoryLimit)
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if err != nil {
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panic(err)
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}
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if isSmaller {
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c.logger.Warningf("The memory request of %v for the Scalyr sidecar container is increased to match the memory limit of %v.", c.opConfig.ScalyrMemoryRequest, c.opConfig.ScalyrMemoryLimit)
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c.opConfig.ScalyrMemoryRequest = c.opConfig.ScalyrMemoryLimit
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}
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// generateStatefulSet adjusts values for individual Postgres clusters
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}
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}
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func (c *Controller) modifyConfigFromEnvironment() {
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c.opConfig.WatchedNamespace = c.getEffectiveNamespace(os.Getenv("WATCHED_NAMESPACE"), c.opConfig.WatchedNamespace)
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if c.config.NoDatabaseAccess {
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c.opConfig.EnableDBAccess = false
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}
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if c.config.NoTeamsAPI {
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c.opConfig.EnableTeamsAPI = false
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}
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scalyrAPIKey := os.Getenv("SCALYR_API_KEY")
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if scalyrAPIKey != "" {
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c.opConfig.ScalyrAPIKey = scalyrAPIKey
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}
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}
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// warningOnDeprecatedParameters emits warnings upon finding deprecated parmaters
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func (c *Controller) warnOnDeprecatedOperatorParameters() {
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if c.opConfig.EnableLoadBalancer != nil {
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c.logger.Warningf("Operator configuration parameter 'enable_load_balancer' is deprecated and takes no effect. " +
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"Consider using the 'enable_master_load_balancer' or 'enable_replica_load_balancer' instead.")
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}
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}
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func (c *Controller) initPodServiceAccount() {
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if c.opConfig.PodServiceAccountDefinition == "" {
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c.opConfig.PodServiceAccountDefinition = `
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{
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"apiVersion": "v1",
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"kind": "ServiceAccount",
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"metadata": {
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"name": "postgres-pod"
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}
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}`
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}
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// re-uses k8s internal parsing. See k8s client-go issue #193 for explanation
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decode := scheme.Codecs.UniversalDeserializer().Decode
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obj, groupVersionKind, err := decode([]byte(c.opConfig.PodServiceAccountDefinition), nil, nil)
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switch {
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case err != nil:
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panic(fmt.Errorf("Unable to parse pod service account definition from the operator configuration: %v", err))
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case groupVersionKind.Kind != "ServiceAccount":
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panic(fmt.Errorf("pod service account definition in the operator configuration defines another type of resource: %v", groupVersionKind.Kind))
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default:
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c.PodServiceAccount = obj.(*v1.ServiceAccount)
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if c.PodServiceAccount.Name != c.opConfig.PodServiceAccountName {
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c.logger.Warnf("in the operator configuration, the pod service account name %v does not match the name %v given in the account definition; using the former for consistency", c.opConfig.PodServiceAccountName, c.PodServiceAccount.Name)
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c.PodServiceAccount.Name = c.opConfig.PodServiceAccountName
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}
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c.PodServiceAccount.Namespace = ""
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}
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// actual service accounts are deployed at the time of Postgres/Spilo cluster creation
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}
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func (c *Controller) initRoleBinding() {
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// service account on its own lacks any rights starting with k8s v1.8
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// operator binds it to the cluster role with sufficient privileges
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// we assume the role is created by the k8s administrator
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if c.opConfig.PodServiceAccountRoleBindingDefinition == "" {
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c.opConfig.PodServiceAccountRoleBindingDefinition = fmt.Sprintf(`
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{
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"apiVersion": "rbac.authorization.k8s.io/v1",
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"kind": "RoleBinding",
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"metadata": {
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"name": "%s"
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},
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"roleRef": {
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"apiGroup": "rbac.authorization.k8s.io",
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"kind": "ClusterRole",
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"name": "%s"
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},
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"subjects": [
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{
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"kind": "ServiceAccount",
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"name": "%s"
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}
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]
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}`, c.PodServiceAccount.Name, c.PodServiceAccount.Name, c.PodServiceAccount.Name)
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}
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c.logger.Info("Parse role bindings")
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// re-uses k8s internal parsing. See k8s client-go issue #193 for explanation
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decode := scheme.Codecs.UniversalDeserializer().Decode
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obj, groupVersionKind, err := decode([]byte(c.opConfig.PodServiceAccountRoleBindingDefinition), nil, nil)
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switch {
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case err != nil:
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panic(fmt.Errorf("unable to parse the definition of the role binding for the pod service account definition from the operator configuration: %v", err))
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case groupVersionKind.Kind != "RoleBinding":
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panic(fmt.Errorf("role binding definition in the operator configuration defines another type of resource: %v", groupVersionKind.Kind))
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default:
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c.PodServiceAccountRoleBinding = obj.(*rbacv1.RoleBinding)
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c.PodServiceAccountRoleBinding.Namespace = ""
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c.logger.Info("successfully parsed")
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}
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// actual roles bindings are deployed at the time of Postgres/Spilo cluster creation
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}
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func (c *Controller) initController() {
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c.initClients()
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if configObjectName := os.Getenv("POSTGRES_OPERATOR_CONFIGURATION_OBJECT"); configObjectName != "" {
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if err := c.createConfigurationCRD(c.opConfig.EnableCRDValidation); err != nil {
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c.logger.Fatalf("could not register Operator Configuration CustomResourceDefinition: %v", err)
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}
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if cfg, err := c.readOperatorConfigurationFromCRD(spec.GetOperatorNamespace(), configObjectName); err != nil {
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c.logger.Fatalf("unable to read operator configuration: %v", err)
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} else {
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c.opConfig = c.importConfigurationFromCRD(&cfg.Configuration)
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}
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} else {
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c.initOperatorConfig()
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}
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c.initPodServiceAccount()
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c.initRoleBinding()
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c.modifyConfigFromEnvironment()
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if err := c.createPostgresCRD(c.opConfig.EnableCRDValidation); err != nil {
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c.logger.Fatalf("could not register Postgres CustomResourceDefinition: %v", err)
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}
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c.initPodServiceAccount()
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c.initSharedInformers()
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if c.opConfig.DebugLogging {
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c.logger.Logger.Level = logrus.DebugLevel
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}
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c.logger.Infof("config: %s", c.opConfig.MustMarshal())
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if infraRoles, err := c.getInfrastructureRoles(&c.opConfig.InfrastructureRolesSecretName); err != nil {
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c.logger.Warningf("could not get infrastructure roles: %v", err)
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} else {
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c.config.InfrastructureRoles = infraRoles
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}
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c.clusterEventQueues = make([]*cache.FIFO, c.opConfig.Workers)
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c.workerLogs = make(map[uint32]ringlog.RingLogger, c.opConfig.Workers)
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for i := range c.clusterEventQueues {
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c.clusterEventQueues[i] = cache.NewFIFO(func(obj interface{}) (string, error) {
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e, ok := obj.(ClusterEvent)
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if !ok {
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return "", fmt.Errorf("could not cast to ClusterEvent")
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}
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return queueClusterKey(e.EventType, e.UID), nil
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})
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}
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c.apiserver = apiserver.New(c, c.opConfig.APIPort, c.logger.Logger)
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}
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func (c *Controller) initSharedInformers() {
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c.postgresqlInformer = acidv1informer.NewPostgresqlInformer(
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c.KubeClient.AcidV1ClientSet,
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c.opConfig.WatchedNamespace,
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constants.QueueResyncPeriodTPR,
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cache.Indexers{})
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c.postgresqlInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
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AddFunc: c.postgresqlAdd,
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UpdateFunc: c.postgresqlUpdate,
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DeleteFunc: c.postgresqlDelete,
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})
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// Pods
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podLw := &cache.ListWatch{
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ListFunc: c.podListFunc,
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WatchFunc: c.podWatchFunc,
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}
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c.podInformer = cache.NewSharedIndexInformer(
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podLw,
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&v1.Pod{},
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constants.QueueResyncPeriodPod,
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cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})
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c.podInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
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AddFunc: c.podAdd,
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UpdateFunc: c.podUpdate,
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DeleteFunc: c.podDelete,
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})
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// Kubernetes Nodes
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nodeLw := &cache.ListWatch{
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ListFunc: c.nodeListFunc,
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WatchFunc: c.nodeWatchFunc,
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}
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c.nodesInformer = cache.NewSharedIndexInformer(
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nodeLw,
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&v1.Node{},
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constants.QueueResyncPeriodNode,
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cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})
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c.nodesInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
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AddFunc: c.nodeAdd,
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UpdateFunc: c.nodeUpdate,
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DeleteFunc: c.nodeDelete,
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})
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}
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// Run starts background controller processes
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func (c *Controller) Run(stopCh <-chan struct{}, wg *sync.WaitGroup) {
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c.initController()
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// start workers reading from the events queue to prevent the initial sync from blocking on it.
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for i := range c.clusterEventQueues {
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wg.Add(1)
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c.workerLogs[uint32(i)] = ringlog.New(c.opConfig.RingLogLines)
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go c.processClusterEventsQueue(i, stopCh, wg)
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}
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// populate clusters before starting nodeInformer that relies on it and run the initial sync
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if err := c.acquireInitialListOfClusters(); err != nil {
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panic("could not acquire initial list of clusters")
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}
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wg.Add(5)
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go c.runPodInformer(stopCh, wg)
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go c.runPostgresqlInformer(stopCh, wg)
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go c.clusterResync(stopCh, wg)
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go c.apiserver.Run(stopCh, wg)
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go c.kubeNodesInformer(stopCh, wg)
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c.logger.Info("started working in background")
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}
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func (c *Controller) runPodInformer(stopCh <-chan struct{}, wg *sync.WaitGroup) {
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defer wg.Done()
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c.podInformer.Run(stopCh)
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}
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func (c *Controller) runPostgresqlInformer(stopCh <-chan struct{}, wg *sync.WaitGroup) {
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defer wg.Done()
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c.postgresqlInformer.Run(stopCh)
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}
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func queueClusterKey(eventType EventType, uid types.UID) string {
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return fmt.Sprintf("%s-%s", eventType, uid)
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}
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func (c *Controller) kubeNodesInformer(stopCh <-chan struct{}, wg *sync.WaitGroup) {
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defer wg.Done()
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c.nodesInformer.Run(stopCh)
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}
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func (c *Controller) getEffectiveNamespace(namespaceFromEnvironment, namespaceFromConfigMap string) string {
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namespace := util.Coalesce(namespaceFromEnvironment, util.Coalesce(namespaceFromConfigMap, spec.GetOperatorNamespace()))
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if namespace == "*" {
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namespace = v1.NamespaceAll
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c.logger.Infof("Listening to all namespaces")
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} else {
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if _, err := c.KubeClient.Namespaces().Get(namespace, metav1.GetOptions{}); err != nil {
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c.logger.Fatalf("Could not find the watched namespace %q", namespace)
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} else {
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c.logger.Infof("Listenting to the specific namespace %q", namespace)
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}
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}
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return namespace
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}
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