Beispiel #1
0
func deletePodsForOldHosts(c *client.Client, ns string, annotations map[string]string, pods *api.PodList, hostEntries []HostEntry) {
	for annKey, podName := range annotations {
		if strings.HasPrefix(annKey, AnsibleHostPodAnnotationPrefix) {
			hostName := annKey[len(AnsibleHostPodAnnotationPrefix):]
			if k8s.PodIsRunning(pods, podName) {
				hostEntry := getHostEntryByName(hostEntries, hostName)
				if hostEntry == nil {
					log.Info("Deleting pod %s as there is no longer an Ansible inventory host called %s", podName, hostName)
					c.Pods(ns).Delete(podName, nil)
				}
			}
		}
	}
}
Beispiel #2
0
// ChooseHostAndPrivateKey parses the given Ansbile inventory file for the hosts
// and chooses a single host inside it, returning the host name and the private key
func ChooseHostAndPrivateKey(inventoryFile string, hosts string, c *client.Client, ns string, rcName string) (*HostEntry, error) {
	hostEntries, err := LoadHostEntries(inventoryFile, hosts)
	if err != nil {
		return nil, err
	}
	log.Info("Found %d host entries", len(hostEntries))

	// lets pick a random entry
	if len(hostEntries) > 0 {
		thisPodName := os.Getenv("HOSTNAME")
		if len(thisPodName) == 0 {
			return nil, fmt.Errorf("Could not find the pod name using $HOSTNAME!")
		}

		retryAttempts := 20

		for i := 0; i < retryAttempts; i++ {
			if i > 0 {
				// lets sleep before retrying
				time.Sleep(time.Duration(random(1000, 20000)) * time.Millisecond)
			}
			if c == nil {
				return nil, fmt.Errorf("No Kubernetes Client specified!")
			}
			rc, err := c.ReplicationControllers(ns).Get(rcName)
			if err != nil {
				return nil, err
			}
			if rc == nil {
				return nil, fmt.Errorf("No ReplicationController found for name %s", rcName)
			}

			pods, err := c.Pods(ns).List(nil, nil)
			if err != nil {
				return nil, err
			}

			metadata := &rc.ObjectMeta
			resourceVersion := metadata.ResourceVersion
			if metadata.Annotations == nil {
				metadata.Annotations = make(map[string]string)
			}
			annotations := metadata.Annotations
			log.Info("found RC with name %s.%s and version %s", ns, rcName, resourceVersion)

			filteredHostEntries := hostEntries
			for annKey, podName := range annotations {
				if strings.HasPrefix(annKey, AnsibleHostPodAnnotationPrefix) {
					hostName := annKey[len(AnsibleHostPodAnnotationPrefix):]

					if k8s.PodIsRunning(pods, podName) {
						if podName != thisPodName {
							log.Info("Pod %s podName has already claimed host %s", podName, hostName)
							filteredHostEntries = removeHostEntry(filteredHostEntries, hostName)
						}
					} else {
						// lets remove this annotation as the pod is no longer valid
						log.Info("Pod %s is no longer running so removing the annotation %s", podName, annKey)
						delete(metadata.Annotations, annKey)
					}
				}
			}

			count := len(filteredHostEntries)

			if count == 0 {
				log.Info("There are no more hosts available to be supervised by this pod!")
				return nil, fmt.Errorf("No more hosts available to be supervised!")
			}
			log.Info("After filtering out hosts owned by other pods we have %v host entries left", count)

			pickedEntry := filteredHostEntries[random(0, count)]
			hostName := pickedEntry.Name
			if len(pickedEntry.Host) == 0 {
				return nil, fmt.Errorf("Could not find host name for entry %s", pickedEntry.Name)
			}
			if len(pickedEntry.PrivateKey) == 0 {
				return nil, fmt.Errorf("Could not find PrivateKey for entry %s", pickedEntry.Name)
			}
			if len(pickedEntry.User) == 0 {
				return nil, fmt.Errorf("Could not find User for entry %s", pickedEntry.Name)
			}

			// lets try pick this pod
			annotations[AnsibleHostPodAnnotationPrefix+hostName] = thisPodName

			_, err = c.ReplicationControllers(ns).Update(rc)
			if err != nil {
				log.Info("Failed to update the RC, could be concurrent update failure: %s", err)
			} else {
				log.Info("Picked host " + pickedEntry.Host)
				return &pickedEntry, nil
			}
		}

	}
	return nil, fmt.Errorf("Could not find any hosts for inventory file %s and hosts %s", inventoryFile, hosts)
}