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)
}
}
}
}
}
// ChooseHostAndPrivateKey parses the given Ansible inventory file for the hosts
// and chooses a single host inside it, returning the host name and the private key
func ChooseHostAndPrivateKey(thisPodName string, hosts string, c *client.Client, ns string, rcName string) (*HostEntry, *api.ReplicationController, map[string]string, error) {
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, nil, nil, fmt.Errorf("No Kubernetes Client specified!")
}
rc, err := c.ReplicationControllers(ns).Get(rcName)
if err != nil {
return nil, nil, nil, err
}
if rc == nil {
return nil, nil, nil, fmt.Errorf("No ReplicationController found for name %s", rcName)
}
pods, err := c.Pods(ns).List(api.ListOptions{})
if err != nil {
return nil, nil, nil, err
}
metadata := &rc.ObjectMeta
resourceVersion := metadata.ResourceVersion
if metadata.Annotations == nil {
metadata.Annotations = make(map[string]string)
}
annotations := metadata.Annotations
log.Info("Using ReplicationController with namespace %s name %s and version %s", ns, rcName, resourceVersion)
hostsText := annotations[HostInventoryAnnotation]
if len(hostsText) == 0 {
return nil, nil, nil, fmt.Errorf("Could not find annotation %s on ReplicationController %s", HostInventoryAnnotation, rcName)
}
hostEntries, err := LoadHostEntriesFromText(hostsText)
if err != nil {
return nil, nil, nil, err
}
log.Info("Found %d host entries", len(hostEntries))
// lets pick a random entry
if len(hostEntries) > 0 {
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, nil, 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, nil, nil, fmt.Errorf("Could not find host name for entry %s", pickedEntry.Name)
}
if len(pickedEntry.User) == 0 {
return nil, nil, nil, fmt.Errorf("Could not find User for entry %s", pickedEntry.Name)
}
// lets try pick this pod
annotations[AnsibleHostPodAnnotationPrefix+hostName] = thisPodName
rc, 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)
// lets update the Pod with the host name label
podClient := c.Pods(ns)
pod, err := podClient.Get(thisPodName)
if err != nil {
return pickedEntry, nil, nil, err
}
metadata := &pod.ObjectMeta
if metadata.Annotations == nil {
metadata.Annotations = make(map[string]string)
}
metadata.Annotations[HostNameAnnotation] = pickedEntry.Name
metadata.Annotations[HostAddressAnnotation] = pickedEntry.Host
//pod.Status = api.PodStatus{}
pod, err = podClient.UpdateStatus(pod)
if err != nil {
return pickedEntry, nil, nil, err
}
// lets export required environment variables
exportEnvVars := os.Getenv(EnvExportEnvVars)
envVars := make(map[string]string)
if len(exportEnvVars) > 0 {
names := strings.Split(exportEnvVars, " ")
for _, name := range names {
name = strings.TrimSpace(name)
if len(name) > 0 {
value := os.Getenv(name)
if len(value) > 0 {
envVars[name] = value
log.Debug("Exporting environment variable %s = %s", name, value)
}
}
}
}
err = forwardPorts(pod, pickedEntry)
return pickedEntry, rc, envVars, err
}
}
}
return nil, nil, nil, fmt.Errorf("Could not find any available hosts on the ReplicationController %s and hosts %s", rcName, hosts)
}
