forked from zalando/postgres-operator
/
resources.go
635 lines (527 loc) · 20.8 KB
/
resources.go
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package cluster
import (
"fmt"
"strconv"
"strings"
"k8s.io/api/apps/v1beta1"
"k8s.io/api/core/v1"
policybeta1 "k8s.io/api/policy/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"github.com/zalando-incubator/postgres-operator/pkg/util"
"github.com/zalando-incubator/postgres-operator/pkg/util/constants"
"github.com/zalando-incubator/postgres-operator/pkg/util/k8sutil"
"github.com/zalando-incubator/postgres-operator/pkg/util/retryutil"
)
const (
rollingUpdateStatefulsetAnnotationKey = "zalando-postgres-operator-rolling-update-required"
)
func (c *Cluster) listResources() error {
if c.PodDisruptionBudget != nil {
c.logger.Infof("found pod disruption budget: %q (uid: %q)", util.NameFromMeta(c.PodDisruptionBudget.ObjectMeta), c.PodDisruptionBudget.UID)
}
if c.Statefulset != nil {
c.logger.Infof("found statefulset: %q (uid: %q)", util.NameFromMeta(c.Statefulset.ObjectMeta), c.Statefulset.UID)
}
for _, obj := range c.Secrets {
c.logger.Infof("found secret: %q (uid: %q)", util.NameFromMeta(obj.ObjectMeta), obj.UID)
}
for role, endpoint := range c.Endpoints {
c.logger.Infof("found %s endpoint: %q (uid: %q)", role, util.NameFromMeta(endpoint.ObjectMeta), endpoint.UID)
}
for role, service := range c.Services {
c.logger.Infof("found %s service: %q (uid: %q)", role, util.NameFromMeta(service.ObjectMeta), service.UID)
}
pods, err := c.listPods()
if err != nil {
return fmt.Errorf("could not get the list of pods: %v", err)
}
for _, obj := range pods {
c.logger.Infof("found pod: %q (uid: %q)", util.NameFromMeta(obj.ObjectMeta), obj.UID)
}
pvcs, err := c.listPersistentVolumeClaims()
if err != nil {
return fmt.Errorf("could not get the list of PVCs: %v", err)
}
for _, obj := range pvcs {
c.logger.Infof("found PVC: %q (uid: %q)", util.NameFromMeta(obj.ObjectMeta), obj.UID)
}
return nil
}
func (c *Cluster) createStatefulSet() (*v1beta1.StatefulSet, error) {
c.setProcessName("creating statefulset")
statefulSetSpec, err := c.generateStatefulSet(&c.Spec)
if err != nil {
return nil, fmt.Errorf("could not generate statefulset: %v", err)
}
statefulSet, err := c.KubeClient.StatefulSets(statefulSetSpec.Namespace).Create(statefulSetSpec)
if err != nil {
return nil, err
}
c.Statefulset = statefulSet
c.logger.Debugf("created new statefulset %q, uid: %q", util.NameFromMeta(statefulSet.ObjectMeta), statefulSet.UID)
return statefulSet, nil
}
func getPodIndex(podName string) (int32, error) {
parts := strings.Split(podName, "-")
if len(parts) == 0 {
return 0, fmt.Errorf("pod has no index part")
}
postfix := parts[len(parts)-1]
res, err := strconv.ParseInt(postfix, 10, 32)
if err != nil {
return 0, fmt.Errorf("could not parse pod index: %v", err)
}
return int32(res), nil
}
func (c *Cluster) preScaleDown(newStatefulSet *v1beta1.StatefulSet) error {
masterPod, err := c.getRolePods(Master)
if err != nil {
return fmt.Errorf("could not get master pod: %v", err)
}
if len(masterPod) == 0 {
return fmt.Errorf("no master pod is running in the cluster")
}
podNum, err := getPodIndex(masterPod[0].Name)
if err != nil {
return fmt.Errorf("could not get pod number: %v", err)
}
//Check if scale down affects current master pod
if *newStatefulSet.Spec.Replicas >= podNum+1 {
return nil
}
podName := fmt.Sprintf("%s-0", c.Statefulset.Name)
masterCandidatePod, err := c.KubeClient.Pods(c.clusterNamespace()).Get(podName, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("could not get master candidate pod: %v", err)
}
// some sanity check
if !util.MapContains(masterCandidatePod.Labels, c.OpConfig.ClusterLabels) ||
!util.MapContains(masterCandidatePod.Labels, map[string]string{c.OpConfig.ClusterNameLabel: c.Name}) {
return fmt.Errorf("pod %q does not belong to cluster", podName)
}
if err := c.patroni.Switchover(&masterPod[0], masterCandidatePod.Name); err != nil {
return fmt.Errorf("could not failover: %v", err)
}
return nil
}
// setRollingUpdateFlagForStatefulSet sets the indicator or the rolling upgrade requirement
// in the StatefulSet annotation.
func (c *Cluster) setRollingUpdateFlagForStatefulSet(sset *v1beta1.StatefulSet, val bool) {
anno := sset.GetAnnotations()
c.logger.Debugf("rolling upgrade flag has been set to %t", val)
if anno == nil {
anno = make(map[string]string)
}
anno[rollingUpdateStatefulsetAnnotationKey] = strconv.FormatBool(val)
sset.SetAnnotations(anno)
}
// applyRollingUpdateFlagforStatefulSet sets the rolling update flag for the cluster's StatefulSet
// and applies that setting to the actual running cluster.
func (c *Cluster) applyRollingUpdateFlagforStatefulSet(val bool) error {
c.setRollingUpdateFlagForStatefulSet(c.Statefulset, val)
sset, err := c.updateStatefulSetAnnotations(c.Statefulset.GetAnnotations())
if err != nil {
return err
}
c.Statefulset = sset
return nil
}
// getRollingUpdateFlagFromStatefulSet returns the value of the rollingUpdate flag from the passed
// StatefulSet, reverting to the default value in case of errors
func (c *Cluster) getRollingUpdateFlagFromStatefulSet(sset *v1beta1.StatefulSet, defaultValue bool) (flag bool) {
anno := sset.GetAnnotations()
flag = defaultValue
stringFlag, exists := anno[rollingUpdateStatefulsetAnnotationKey]
if exists {
var err error
if flag, err = strconv.ParseBool(stringFlag); err != nil {
c.logger.Warnf("error when parsing %q annotation for the statefulset %q: expected boolean value, got %q\n",
rollingUpdateStatefulsetAnnotationKey,
types.NamespacedName{Namespace: sset.Namespace, Name: sset.Name},
stringFlag)
flag = defaultValue
}
}
return flag
}
// mergeRollingUpdateFlagUsingCache return the value of the rollingUpdate flag from the passed
// statefulset, however, the value can be cleared if there is a cached flag in the cluster that
// is set to false (the disrepancy could be a result of a failed StatefulSet update).s
func (c *Cluster) mergeRollingUpdateFlagUsingCache(runningStatefulSet *v1beta1.StatefulSet) bool {
var (
cachedStatefulsetExists, clearRollingUpdateFromCache, podsRollingUpdateRequired bool
)
if c.Statefulset != nil {
// if we reset the rolling update flag in the statefulset structure in memory but didn't manage to update
// the actual object in Kubernetes for some reason we want to avoid doing an unnecessary update by relying
// on the 'cached' in-memory flag.
cachedStatefulsetExists = true
clearRollingUpdateFromCache = !c.getRollingUpdateFlagFromStatefulSet(c.Statefulset, true)
c.logger.Debugf("cached StatefulSet value exists, rollingUpdate flag is %t", clearRollingUpdateFromCache)
}
if podsRollingUpdateRequired = c.getRollingUpdateFlagFromStatefulSet(runningStatefulSet, false); podsRollingUpdateRequired {
if cachedStatefulsetExists && clearRollingUpdateFromCache {
c.logger.Infof("clearing the rolling update flag based on the cached information")
podsRollingUpdateRequired = false
} else {
c.logger.Infof("found a statefulset with an unfinished pods rolling update")
}
}
return podsRollingUpdateRequired
}
func (c *Cluster) updateStatefulSetAnnotations(annotations map[string]string) (*v1beta1.StatefulSet, error) {
c.logger.Debugf("updating statefulset annotations")
patchData, err := metaAnnotationsPatch(annotations)
if err != nil {
return nil, fmt.Errorf("could not form patch for the statefulset metadata: %v", err)
}
result, err := c.KubeClient.StatefulSets(c.Statefulset.Namespace).Patch(
c.Statefulset.Name,
types.MergePatchType,
[]byte(patchData), "")
if err != nil {
return nil, fmt.Errorf("could not patch statefulset annotations %q: %v", patchData, err)
}
return result, nil
}
func (c *Cluster) updateStatefulSet(newStatefulSet *v1beta1.StatefulSet) error {
c.setProcessName("updating statefulset")
if c.Statefulset == nil {
return fmt.Errorf("there is no statefulset in the cluster")
}
statefulSetName := util.NameFromMeta(c.Statefulset.ObjectMeta)
//scale down
if *c.Statefulset.Spec.Replicas > *newStatefulSet.Spec.Replicas {
if err := c.preScaleDown(newStatefulSet); err != nil {
c.logger.Warningf("could not scale down: %v", err)
}
}
c.logger.Debugf("updating statefulset")
patchData, err := specPatch(newStatefulSet.Spec)
if err != nil {
return fmt.Errorf("could not form patch for the statefulset %q: %v", statefulSetName, err)
}
statefulSet, err := c.KubeClient.StatefulSets(c.Statefulset.Namespace).Patch(
c.Statefulset.Name,
types.MergePatchType,
patchData, "")
if err != nil {
return fmt.Errorf("could not patch statefulset spec %q: %v", statefulSetName, err)
}
if newStatefulSet.Annotations != nil {
statefulSet, err = c.updateStatefulSetAnnotations(newStatefulSet.Annotations)
if err != nil {
return err
}
}
c.Statefulset = statefulSet
return nil
}
// replaceStatefulSet deletes an old StatefulSet and creates the new using spec in the PostgreSQL CRD.
func (c *Cluster) replaceStatefulSet(newStatefulSet *v1beta1.StatefulSet) error {
c.setProcessName("replacing statefulset")
if c.Statefulset == nil {
return fmt.Errorf("there is no statefulset in the cluster")
}
statefulSetName := util.NameFromMeta(c.Statefulset.ObjectMeta)
c.logger.Debugf("replacing statefulset")
// Delete the current statefulset without deleting the pods
deletePropagationPolicy := metav1.DeletePropagationOrphan
oldStatefulset := c.Statefulset
options := metav1.DeleteOptions{PropagationPolicy: &deletePropagationPolicy}
if err := c.KubeClient.StatefulSets(oldStatefulset.Namespace).Delete(oldStatefulset.Name, &options); err != nil {
return fmt.Errorf("could not delete statefulset %q: %v", statefulSetName, err)
}
// make sure we clear the stored statefulset status if the subsequent create fails.
c.Statefulset = nil
// wait until the statefulset is truly deleted
c.logger.Debugf("waiting for the statefulset to be deleted")
err := retryutil.Retry(constants.StatefulsetDeletionInterval, constants.StatefulsetDeletionTimeout,
func() (bool, error) {
_, err := c.KubeClient.StatefulSets(oldStatefulset.Namespace).Get(oldStatefulset.Name, metav1.GetOptions{})
return err != nil, nil
})
if err != nil {
return fmt.Errorf("could not delete statefulset: %v", err)
}
// create the new statefulset with the desired spec. It would take over the remaining pods.
createdStatefulset, err := c.KubeClient.StatefulSets(newStatefulSet.Namespace).Create(newStatefulSet)
if err != nil {
return fmt.Errorf("could not create statefulset %q: %v", statefulSetName, err)
}
// check that all the previous replicas were picked up.
if newStatefulSet.Spec.Replicas == oldStatefulset.Spec.Replicas &&
createdStatefulset.Status.Replicas != oldStatefulset.Status.Replicas {
c.logger.Warningf("number of pods for the old and updated Statefulsets is not identical")
}
c.Statefulset = createdStatefulset
return nil
}
func (c *Cluster) deleteStatefulSet() error {
c.setProcessName("deleting statefulset")
c.logger.Debugln("deleting statefulset")
if c.Statefulset == nil {
return fmt.Errorf("there is no statefulset in the cluster")
}
err := c.KubeClient.StatefulSets(c.Statefulset.Namespace).Delete(c.Statefulset.Name, c.deleteOptions)
if err != nil {
return err
}
c.logger.Infof("statefulset %q has been deleted", util.NameFromMeta(c.Statefulset.ObjectMeta))
c.Statefulset = nil
if err := c.deletePods(); err != nil {
return fmt.Errorf("could not delete pods: %v", err)
}
if err := c.deletePersistenVolumeClaims(); err != nil {
return fmt.Errorf("could not delete PersistentVolumeClaims: %v", err)
}
return nil
}
func (c *Cluster) createService(role PostgresRole) (*v1.Service, error) {
c.setProcessName("creating %v service", role)
serviceSpec := c.generateService(role, &c.Spec)
service, err := c.KubeClient.Services(serviceSpec.Namespace).Create(serviceSpec)
if err != nil {
return nil, err
}
c.Services[role] = service
return service, nil
}
func (c *Cluster) updateService(role PostgresRole, newService *v1.Service) error {
c.setProcessName("updating %v service", role)
if c.Services[role] == nil {
return fmt.Errorf("there is no service in the cluster")
}
serviceName := util.NameFromMeta(c.Services[role].ObjectMeta)
endpointName := util.NameFromMeta(c.Endpoints[role].ObjectMeta)
// TODO: check if it possible to change the service type with a patch in future versions of Kubernetes
if newService.Spec.Type != c.Services[role].Spec.Type {
// service type has changed, need to replace the service completely.
// we cannot use just pach the current service, since it may contain attributes incompatible with the new type.
var (
currentEndpoint *v1.Endpoints
err error
)
if role == Master {
// for the master service we need to re-create the endpoint as well. Get the up-to-date version of
// the addresses stored in it before the service is deleted (deletion of the service removes the endpooint)
currentEndpoint, err = c.KubeClient.Endpoints(c.Namespace).Get(c.endpointName(role), metav1.GetOptions{})
if err != nil {
return fmt.Errorf("could not get current cluster %s endpoints: %v", role, err)
}
}
err = c.KubeClient.Services(serviceName.Namespace).Delete(serviceName.Name, c.deleteOptions)
if err != nil {
return fmt.Errorf("could not delete service %q: %v", serviceName, err)
}
c.Endpoints[role] = nil
svc, err := c.KubeClient.Services(serviceName.Namespace).Create(newService)
if err != nil {
return fmt.Errorf("could not create service %q: %v", serviceName, err)
}
c.Services[role] = svc
if role == Master {
// create the new endpoint using the addresses obtained from the previous one
endpointSpec := c.generateEndpoint(role, currentEndpoint.Subsets)
ep, err := c.KubeClient.Endpoints(endpointSpec.Namespace).Create(endpointSpec)
if err != nil {
return fmt.Errorf("could not create endpoint %q: %v", endpointName, err)
}
c.Endpoints[role] = ep
}
return nil
}
// update the service annotation in order to propagate ELB notation.
if len(newService.ObjectMeta.Annotations) > 0 {
if annotationsPatchData, err := metaAnnotationsPatch(newService.ObjectMeta.Annotations); err == nil {
_, err = c.KubeClient.Services(serviceName.Namespace).Patch(
serviceName.Name,
types.MergePatchType,
[]byte(annotationsPatchData), "")
if err != nil {
return fmt.Errorf("could not replace annotations for the service %q: %v", serviceName, err)
}
} else {
return fmt.Errorf("could not form patch for the service metadata: %v", err)
}
}
patchData, err := specPatch(newService.Spec)
if err != nil {
return fmt.Errorf("could not form patch for the service %q: %v", serviceName, err)
}
// update the service spec
svc, err := c.KubeClient.Services(serviceName.Namespace).Patch(
serviceName.Name,
types.MergePatchType,
patchData, "")
if err != nil {
return fmt.Errorf("could not patch service %q: %v", serviceName, err)
}
c.Services[role] = svc
return nil
}
func (c *Cluster) deleteService(role PostgresRole) error {
c.logger.Debugf("deleting service %s", role)
service := c.Services[role]
if err := c.KubeClient.Services(service.Namespace).Delete(service.Name, c.deleteOptions); err != nil {
return err
}
c.logger.Infof("%s service %q has been deleted", role, util.NameFromMeta(service.ObjectMeta))
c.Services[role] = nil
return nil
}
func (c *Cluster) createEndpoint(role PostgresRole) (*v1.Endpoints, error) {
var (
subsets []v1.EndpointSubset
)
c.setProcessName("creating endpoint")
if !c.isNewCluster() {
subsets = c.generateEndpointSubsets(role)
} else {
// Patroni will populate the master endpoint for the new cluster
// The replica endpoint will be filled-in by the service selector.
subsets = make([]v1.EndpointSubset, 0)
}
endpointsSpec := c.generateEndpoint(role, subsets)
endpoints, err := c.KubeClient.Endpoints(endpointsSpec.Namespace).Create(endpointsSpec)
if err != nil {
return nil, fmt.Errorf("could not create %s endpoint: %v", role, err)
}
c.Endpoints[role] = endpoints
return endpoints, nil
}
func (c *Cluster) generateEndpointSubsets(role PostgresRole) []v1.EndpointSubset {
result := make([]v1.EndpointSubset, 0)
pods, err := c.getRolePods(role)
if err != nil {
if role == Master {
c.logger.Warningf("could not obtain the address for %s pod: %v", role, err)
} else {
c.logger.Warningf("could not obtain the addresses for %s pods: %v", role, err)
}
return result
}
endPointAddresses := make([]v1.EndpointAddress, 0)
for _, pod := range pods {
endPointAddresses = append(endPointAddresses, v1.EndpointAddress{IP: pod.Status.PodIP})
}
if len(endPointAddresses) > 0 {
result = append(result, v1.EndpointSubset{
Addresses: endPointAddresses,
Ports: []v1.EndpointPort{{Name: "postgresql", Port: 5432, Protocol: "TCP"}},
})
} else if role == Master {
c.logger.Warningf("master is not running, generated master endpoint does not contain any addresses")
}
return result
}
func (c *Cluster) createPodDisruptionBudget() (*policybeta1.PodDisruptionBudget, error) {
podDisruptionBudgetSpec := c.generatePodDisruptionBudget()
podDisruptionBudget, err := c.KubeClient.
PodDisruptionBudgets(podDisruptionBudgetSpec.Namespace).
Create(podDisruptionBudgetSpec)
if err != nil {
return nil, err
}
c.PodDisruptionBudget = podDisruptionBudget
return podDisruptionBudget, nil
}
func (c *Cluster) updatePodDisruptionBudget(pdb *policybeta1.PodDisruptionBudget) error {
if c.PodDisruptionBudget == nil {
return fmt.Errorf("there is no pod disruption budget in the cluster")
}
if err := c.deletePodDisruptionBudget(); err != nil {
return fmt.Errorf("could not delete pod disruption budget: %v", err)
}
newPdb, err := c.KubeClient.
PodDisruptionBudgets(pdb.Namespace).
Create(pdb)
if err != nil {
return fmt.Errorf("could not create pod disruption budget: %v", err)
}
c.PodDisruptionBudget = newPdb
return nil
}
func (c *Cluster) deletePodDisruptionBudget() error {
c.logger.Debug("deleting pod disruption budget")
if c.PodDisruptionBudget == nil {
return fmt.Errorf("there is no pod disruption budget in the cluster")
}
pdbName := util.NameFromMeta(c.PodDisruptionBudget.ObjectMeta)
err := c.KubeClient.
PodDisruptionBudgets(c.PodDisruptionBudget.Namespace).
Delete(c.PodDisruptionBudget.Name, c.deleteOptions)
if err != nil {
return fmt.Errorf("could not delete pod disruption budget: %v", err)
}
c.logger.Infof("pod disruption budget %q has been deleted", util.NameFromMeta(c.PodDisruptionBudget.ObjectMeta))
c.PodDisruptionBudget = nil
err = retryutil.Retry(c.OpConfig.ResourceCheckInterval, c.OpConfig.ResourceCheckTimeout,
func() (bool, error) {
_, err2 := c.KubeClient.PodDisruptionBudgets(pdbName.Namespace).Get(pdbName.Name, metav1.GetOptions{})
if err2 == nil {
return false, nil
}
if k8sutil.ResourceNotFound(err2) {
return true, nil
}
return false, err2
})
if err != nil {
return fmt.Errorf("could not delete pod disruption budget: %v", err)
}
return nil
}
func (c *Cluster) deleteEndpoint(role PostgresRole) error {
c.setProcessName("deleting endpoint")
c.logger.Debugln("deleting endpoint")
if c.Endpoints[role] == nil {
return fmt.Errorf("there is no %s endpoint in the cluster", role)
}
if err := c.KubeClient.Endpoints(c.Endpoints[role].Namespace).Delete(c.Endpoints[role].Name, c.deleteOptions); err != nil {
return fmt.Errorf("could not delete endpoint: %v", err)
}
c.logger.Infof("endpoint %q has been deleted", util.NameFromMeta(c.Endpoints[role].ObjectMeta))
c.Endpoints[role] = nil
return nil
}
func (c *Cluster) deleteSecret(secret *v1.Secret) error {
c.setProcessName("deleting secret %q", util.NameFromMeta(secret.ObjectMeta))
c.logger.Debugf("deleting secret %q", util.NameFromMeta(secret.ObjectMeta))
err := c.KubeClient.Secrets(secret.Namespace).Delete(secret.Name, c.deleteOptions)
if err != nil {
return err
}
c.logger.Infof("secret %q has been deleted", util.NameFromMeta(secret.ObjectMeta))
delete(c.Secrets, secret.UID)
return err
}
func (c *Cluster) createRoles() (err error) {
// TODO: figure out what to do with duplicate names (humans and robots) among pgUsers
return c.syncRoles()
}
// GetServiceMaster returns cluster's kubernetes master Service
func (c *Cluster) GetServiceMaster() *v1.Service {
return c.Services[Master]
}
// GetServiceReplica returns cluster's kubernetes replica Service
func (c *Cluster) GetServiceReplica() *v1.Service {
return c.Services[Replica]
}
// GetEndpointMaster returns cluster's kubernetes master Endpoint
func (c *Cluster) GetEndpointMaster() *v1.Endpoints {
return c.Endpoints[Master]
}
// GetEndpointReplica returns cluster's kubernetes master Endpoint
func (c *Cluster) GetEndpointReplica() *v1.Endpoints {
return c.Endpoints[Replica]
}
// GetStatefulSet returns cluster's kubernetes StatefulSet
func (c *Cluster) GetStatefulSet() *v1beta1.StatefulSet {
return c.Statefulset
}
// GetPodDisruptionBudget returns cluster's kubernetes PodDisruptionBudget
func (c *Cluster) GetPodDisruptionBudget() *policybeta1.PodDisruptionBudget {
return c.PodDisruptionBudget
}