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addons.go
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addons.go
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package cluster
import (
"bytes"
"context"
"fmt"
"os"
"os/exec"
"time"
"io/ioutil"
"net/http"
"strings"
"github.com/rancher/rke/addons"
"github.com/rancher/rke/k8s"
"github.com/rancher/rke/log"
"github.com/sirupsen/logrus"
"gopkg.in/yaml.v2"
)
const (
KubeDNSAddonResourceName = "rke-kubedns-addon"
UserAddonResourceName = "rke-user-addon"
IngressAddonResourceName = "rke-ingress-controller"
UserAddonsIncludeResourceName = "rke-user-includes-addons"
IngressAddonJobName = "rke-ingress-controller-deploy-job"
IngressAddonDeleteJobName = "rke-ingress-controller-delete-job"
MetricsServerAddonResourceName = "rke-metrics-addon"
)
type ingressOptions struct {
RBACConfig string
Options map[string]string
NodeSelector map[string]string
ExtraArgs map[string]string
AlpineImage string
IngressImage string
IngressBackend string
}
type MetricsServerOptions struct {
RBACConfig string
Options map[string]string
MetricsServerImage string
}
type addonError struct {
err string
isCritical bool
}
func (e *addonError) Error() string {
return e.err
}
func (c *Cluster) deployK8sAddOns(ctx context.Context) error {
if err := c.deployKubeDNS(ctx); err != nil {
if err, ok := err.(*addonError); ok && err.isCritical {
return err
}
log.Warnf(ctx, "Failed to deploy addon execute job [%s]: %v", KubeDNSAddonResourceName, err)
}
if c.Monitoring.Provider == DefaultMonitoringProvider {
if err := c.deployMetricServer(ctx); err != nil {
if err, ok := err.(*addonError); ok && err.isCritical {
return err
}
log.Warnf(ctx, "Failed to deploy addon execute job [%s]: %v", MetricsServerAddonResourceName, err)
}
}
if err := c.deployIngress(ctx); err != nil {
if err, ok := err.(*addonError); ok && err.isCritical {
return err
}
log.Warnf(ctx, "Failed to deploy addon execute job [%s]: %v", IngressAddonResourceName, err)
}
return nil
}
func (c *Cluster) deployUserAddOns(ctx context.Context) error {
log.Infof(ctx, "[addons] Setting up user addons")
if c.Addons != "" {
if err := c.doAddonDeploy(ctx, c.Addons, UserAddonResourceName, false); err != nil {
return err
}
}
if len(c.AddonsInclude) > 0 {
if err := c.deployAddonsInclude(ctx); err != nil {
return err
}
}
if c.Addons == "" && len(c.AddonsInclude) == 0 {
log.Infof(ctx, "[addons] no user addons defined")
} else {
log.Infof(ctx, "[addons] User addons deployed successfully")
}
return nil
}
func (c *Cluster) deployAddonsInclude(ctx context.Context) error {
var manifests []byte
log.Infof(ctx, "[addons] Checking for included user addons")
if len(c.AddonsInclude) == 0 {
log.Infof(ctx, "[addons] No included addon paths or urls..")
return nil
}
for _, addon := range c.AddonsInclude {
if strings.HasPrefix(addon, "http") {
addonYAML, err := getAddonFromURL(addon)
if err != nil {
return err
}
log.Infof(ctx, "[addons] Adding addon from url %s", addon)
logrus.Debugf("URL Yaml: %s", addonYAML)
if err := validateUserAddonYAML(addonYAML); err != nil {
return err
}
manifests = append(manifests, addonYAML...)
} else if isFilePath(addon) {
addonYAML, err := ioutil.ReadFile(addon)
if err != nil {
return err
}
log.Infof(ctx, "[addons] Adding addon from %s", addon)
logrus.Debugf("FilePath Yaml: %s", string(addonYAML))
// make sure we properly separated manifests
addonYAMLStr := string(addonYAML)
if !strings.HasPrefix(addonYAMLStr, "---") {
addonYAML = []byte(fmt.Sprintf("%s\n%s", "---", addonYAMLStr))
}
if err := validateUserAddonYAML(addonYAML); err != nil {
return err
}
manifests = append(manifests, addonYAML...)
} else {
log.Warnf(ctx, "[addons] Unable to determine if %s is a file path or url, skipping", addon)
}
}
log.Infof(ctx, "[addons] Deploying %s", UserAddonsIncludeResourceName)
logrus.Debugf("[addons] Compiled addons yaml: %s", string(manifests))
return c.doAddonDeploy(ctx, string(manifests), UserAddonsIncludeResourceName, false)
}
func validateUserAddonYAML(addon []byte) error {
yamlContents := make(map[string]interface{})
return yaml.Unmarshal(addon, &yamlContents)
}
func isFilePath(addonPath string) bool {
if _, err := os.Stat(addonPath); os.IsNotExist(err) {
return false
}
return true
}
func getAddonFromURL(yamlURL string) ([]byte, error) {
resp, err := http.Get(yamlURL)
if err != nil {
return nil, err
}
defer resp.Body.Close()
addonYaml, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
return addonYaml, nil
}
func (c *Cluster) deployKubeDNS(ctx context.Context) error {
log.Infof(ctx, "[addons] Setting up KubeDNS")
kubeDNSConfig := map[string]string{
addons.KubeDNSServer: c.ClusterDNSServer,
addons.KubeDNSClusterDomain: c.ClusterDomain,
addons.KubeDNSImage: c.SystemImages.KubeDNS,
addons.DNSMasqImage: c.SystemImages.DNSmasq,
addons.KubeDNSSidecarImage: c.SystemImages.KubeDNSSidecar,
addons.KubeDNSAutoScalerImage: c.SystemImages.KubeDNSAutoscaler,
addons.RBAC: c.Authorization.Mode,
}
kubeDNSYaml, err := addons.GetKubeDNSManifest(kubeDNSConfig)
if err != nil {
return err
}
if err := c.doAddonDeploy(ctx, kubeDNSYaml, KubeDNSAddonResourceName, false); err != nil {
return err
}
log.Infof(ctx, "[addons] KubeDNS deployed successfully..")
return nil
}
func (c *Cluster) deployMetricServer(ctx context.Context) error {
log.Infof(ctx, "[addons] Setting up Metrics Server")
MetricsServerConfig := MetricsServerOptions{
MetricsServerImage: c.SystemImages.MetricsServer,
RBACConfig: c.Authorization.Mode,
Options: c.Monitoring.Options,
}
kubeDNSYaml, err := addons.GetMetricsServerManifest(MetricsServerConfig)
if err != nil {
return err
}
if err := c.doAddonDeploy(ctx, kubeDNSYaml, MetricsServerAddonResourceName, false); err != nil {
return err
}
log.Infof(ctx, "[addons] KubeDNS deployed successfully..")
return nil
}
func (c *Cluster) deployWithKubectl(ctx context.Context, addonYaml string) error {
buf := bytes.NewBufferString(addonYaml)
cmd := exec.Command("kubectl", "--kubeconfig", c.LocalKubeConfigPath, "apply", "-f", "-")
cmd.Stdin = buf
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
func (c *Cluster) doAddonDeploy(ctx context.Context, addonYaml, resourceName string, isCritical bool) error {
if c.UseKubectlDeploy {
if err := c.deployWithKubectl(ctx, addonYaml); err != nil {
return &addonError{fmt.Sprintf("%v", err), isCritical}
}
}
addonUpdated, err := c.StoreAddonConfigMap(ctx, addonYaml, resourceName)
if err != nil {
return &addonError{fmt.Sprintf("Failed to save addon ConfigMap: %v", err), isCritical}
}
log.Infof(ctx, "[addons] Executing deploy job..")
k8sClient, err := k8s.NewClient(c.LocalKubeConfigPath, c.K8sWrapTransport)
if err != nil {
return &addonError{fmt.Sprintf("%v", err), isCritical}
}
node, err := k8s.GetNode(k8sClient, c.ControlPlaneHosts[0].HostnameOverride)
if err != nil {
return &addonError{fmt.Sprintf("Failed to get Node [%s]: %v", c.ControlPlaneHosts[0].HostnameOverride, err), isCritical}
}
addonJob, err := addons.GetAddonsExecuteJob(resourceName, node.Name, c.Services.KubeAPI.Image)
if err != nil {
return &addonError{fmt.Sprintf("Failed to generate addon execute job: %v", err), isCritical}
}
if err = c.ApplySystemAddonExecuteJob(addonJob, addonUpdated); err != nil {
return &addonError{fmt.Sprintf("%v", err), isCritical}
}
return nil
}
func (c *Cluster) doAddonDelete(ctx context.Context, resourceName string, isCritical bool) error {
k8sClient, err := k8s.NewClient(c.LocalKubeConfigPath, c.K8sWrapTransport)
if err != nil {
return &addonError{fmt.Sprintf("%v", err), isCritical}
}
node, err := k8s.GetNode(k8sClient, c.ControlPlaneHosts[0].HostnameOverride)
if err != nil {
return &addonError{fmt.Sprintf("Failed to get Node [%s]: %v", c.ControlPlaneHosts[0].HostnameOverride, err), isCritical}
}
deleteJob, err := addons.GetAddonsDeleteJob(resourceName, node.Name, c.Services.KubeAPI.Image)
if err != nil {
return &addonError{fmt.Sprintf("Failed to generate addon delete job: %v", err), isCritical}
}
if err := k8s.ApplyK8sSystemJob(deleteJob, c.LocalKubeConfigPath, c.K8sWrapTransport, c.AddonJobTimeout*2, false); err != nil {
return &addonError{fmt.Sprintf("%v", err), isCritical}
}
// At this point, the addon should be deleted. We need to clean up by deleting the deploy and delete jobs.
tmpJobYaml, err := addons.GetAddonsExecuteJob(resourceName, node.Name, c.Services.KubeAPI.Image)
if err != nil {
return err
}
if err := k8s.DeleteK8sSystemJob(tmpJobYaml, k8sClient, c.AddonJobTimeout); err != nil {
return err
}
if err := k8s.DeleteK8sSystemJob(deleteJob, k8sClient, c.AddonJobTimeout); err != nil {
return err
}
return nil
}
func (c *Cluster) StoreAddonConfigMap(ctx context.Context, addonYaml string, addonName string) (bool, error) {
log.Infof(ctx, "[addons] Saving addon ConfigMap to Kubernetes")
updated := false
kubeClient, err := k8s.NewClient(c.LocalKubeConfigPath, c.K8sWrapTransport)
if err != nil {
return updated, err
}
timeout := make(chan bool, 1)
go func() {
for {
updated, err = k8s.UpdateConfigMap(kubeClient, []byte(addonYaml), addonName)
if err != nil {
time.Sleep(time.Second * 5)
fmt.Println(err)
continue
}
log.Infof(ctx, "[addons] Successfully Saved addon to Kubernetes ConfigMap: %s", addonName)
timeout <- true
break
}
}()
select {
case <-timeout:
return updated, nil
case <-time.After(time.Second * UpdateStateTimeout):
return updated, fmt.Errorf("[addons] Timeout waiting for kubernetes to be ready")
}
}
func (c *Cluster) ApplySystemAddonExecuteJob(addonJob string, addonUpdated bool) error {
if err := k8s.ApplyK8sSystemJob(addonJob, c.LocalKubeConfigPath, c.K8sWrapTransport, c.AddonJobTimeout, addonUpdated); err != nil {
return err
}
return nil
}
func (c *Cluster) deployIngress(ctx context.Context) error {
if c.Ingress.Provider == "none" {
addonJobExists, err := addons.AddonJobExists(IngressAddonJobName, c.LocalKubeConfigPath, c.K8sWrapTransport)
if err != nil {
return nil
}
if addonJobExists {
log.Infof(ctx, "[ingress] removing installed ingress controller")
if err := c.doAddonDelete(ctx, IngressAddonResourceName, false); err != nil {
return err
}
log.Infof(ctx, "[ingress] ingress controller removed successfully")
} else {
log.Infof(ctx, "[ingress] ingress controller is disabled, skipping ingress controller")
}
return nil
}
log.Infof(ctx, "[ingress] Setting up %s ingress controller", c.Ingress.Provider)
ingressConfig := ingressOptions{
RBACConfig: c.Authorization.Mode,
Options: c.Ingress.Options,
NodeSelector: c.Ingress.NodeSelector,
ExtraArgs: c.Ingress.ExtraArgs,
AlpineImage: c.SystemImages.Alpine,
IngressImage: c.SystemImages.Ingress,
IngressBackend: c.SystemImages.IngressBackend,
}
// Currently only deploying nginx ingress controller
ingressYaml, err := addons.GetNginxIngressManifest(ingressConfig)
if err != nil {
return err
}
if err := c.doAddonDeploy(ctx, ingressYaml, IngressAddonResourceName, false); err != nil {
return err
}
log.Infof(ctx, "[ingress] ingress controller %s is successfully deployed", c.Ingress.Provider)
return nil
}