/
addons.go
527 lines (471 loc) · 16.3 KB
/
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/rancher/rke/util"
"github.com/sirupsen/logrus"
"gopkg.in/yaml.v2"
)
const (
UserAddonResourceName = "rke-user-addon"
IngressAddonResourceName = "rke-ingress-controller"
UserAddonsIncludeResourceName = "rke-user-includes-addons"
IngressAddonJobName = "rke-ingress-controller-deploy-job"
MetricsServerAddonJobName = "rke-metrics-addon-deploy-job"
MetricsServerAddonResourceName = "rke-metrics-addon"
NginxIngressAddonAppName = "ingress-nginx"
KubeDNSAddonAppName = "kube-dns"
KubeDNSAutoscalerAppName = "kube-dns-autoscaler"
CoreDNSAutoscalerAppName = "coredns-autoscaler"
KubeAPIAuthAppName = "kube-api-auth"
CattleClusterAgentAppName = "cattle-cluster-agent"
CoreDNSProvider = "coredns"
KubeDNSProvider = "kube-dns"
)
var DNSProviders = []string{KubeDNSProvider, CoreDNSProvider}
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
Version string
}
type CoreDNSOptions struct {
RBACConfig string
CoreDNSImage string
CoreDNSAutoScalerImage string
ClusterDomain string
ClusterDNSServer string
ReverseCIDRs []string
UpstreamNameservers []string
NodeSelector map[string]string
}
type KubeDNSOptions struct {
RBACConfig string
KubeDNSImage string
DNSMasqImage string
KubeDNSAutoScalerImage string
KubeDNSSidecarImage string
ClusterDomain string
ClusterDNSServer string
ReverseCIDRs []string
UpstreamNameservers []string
NodeSelector map[string]string
}
type addonError struct {
err string
isCritical bool
}
func (e *addonError) Error() string {
return e.err
}
func getAddonResourceName(addon string) string {
AddonResourceName := "rke-" + addon + "-addon"
return AddonResourceName
}
func (c *Cluster) deployK8sAddOns(ctx context.Context) error {
if err := c.deployDNS(ctx); err != nil {
if err, ok := err.(*addonError); ok && err.isCritical {
return err
}
log.Warnf(ctx, "Failed to deploy DNS addon execute job for provider %s: %v", c.DNS.Provider, err)
}
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 %s", c.DNS.Provider)
KubeDNSConfig := KubeDNSOptions{
KubeDNSImage: c.SystemImages.KubeDNS,
KubeDNSSidecarImage: c.SystemImages.KubeDNSSidecar,
KubeDNSAutoScalerImage: c.SystemImages.KubeDNSAutoscaler,
DNSMasqImage: c.SystemImages.DNSmasq,
RBACConfig: c.Authorization.Mode,
ClusterDomain: c.ClusterDomain,
ClusterDNSServer: c.ClusterDNSServer,
UpstreamNameservers: c.DNS.UpstreamNameservers,
ReverseCIDRs: c.DNS.ReverseCIDRs,
NodeSelector: c.DNS.NodeSelector,
}
kubeDNSYaml, err := addons.GetKubeDNSManifest(KubeDNSConfig)
if err != nil {
return err
}
if err := c.doAddonDeploy(ctx, kubeDNSYaml, getAddonResourceName(c.DNS.Provider), false); err != nil {
return err
}
log.Infof(ctx, "[addons] %s deployed successfully", c.DNS.Provider)
return nil
}
func (c *Cluster) deployCoreDNS(ctx context.Context) error {
log.Infof(ctx, "[addons] Setting up %s", c.DNS.Provider)
CoreDNSConfig := CoreDNSOptions{
CoreDNSImage: c.SystemImages.CoreDNS,
CoreDNSAutoScalerImage: c.SystemImages.CoreDNSAutoscaler,
RBACConfig: c.Authorization.Mode,
ClusterDomain: c.ClusterDomain,
ClusterDNSServer: c.ClusterDNSServer,
UpstreamNameservers: c.DNS.UpstreamNameservers,
ReverseCIDRs: c.DNS.ReverseCIDRs,
NodeSelector: c.DNS.NodeSelector,
}
coreDNSYaml, err := addons.GetCoreDNSManifest(CoreDNSConfig)
if err != nil {
return err
}
if err := c.doAddonDeploy(ctx, coreDNSYaml, getAddonResourceName(c.DNS.Provider), false); err != nil {
return err
}
log.Infof(ctx, "[addons] CoreDNS deployed successfully..")
return nil
}
func (c *Cluster) deployMetricServer(ctx context.Context) error {
if c.Monitoring.Provider == "none" {
addonJobExists, err := addons.AddonJobExists(MetricsServerAddonJobName, c.LocalKubeConfigPath, c.K8sWrapTransport)
if err != nil {
return nil
}
if addonJobExists {
log.Infof(ctx, "[ingress] Removing installed metrics server")
if err := c.doAddonDelete(ctx, MetricsServerAddonResourceName, false); err != nil {
return err
}
log.Infof(ctx, "[ingress] Metrics server removed successfully")
} else {
log.Infof(ctx, "[ingress] Metrics Server is disabled, skipping Metrics server installation")
}
return nil
}
log.Infof(ctx, "[addons] Setting up Metrics Server")
s := strings.Split(c.SystemImages.MetricsServer, ":")
versionTag := s[len(s)-1]
MetricsServerConfig := MetricsServerOptions{
MetricsServerImage: c.SystemImages.MetricsServer,
RBACConfig: c.Authorization.Mode,
Options: c.Monitoring.Options,
Version: util.GetTagMajorVersion(versionTag),
}
metricsYaml, err := addons.GetMetricsServerManifest(MetricsServerConfig)
if err != nil {
return err
}
if err := c.doAddonDeploy(ctx, metricsYaml, MetricsServerAddonResourceName, false); err != nil {
return err
}
log.Infof(ctx, "[addons] Metrics Server 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 %s", resourceName)
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 ConfigMap for addon %s to Kubernetes", addonName)
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)
continue
}
log.Infof(ctx, "[addons] Successfully saved ConfigMap for addon %s to Kubernetes", 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,
IngressImage: c.SystemImages.Ingress,
IngressBackend: c.SystemImages.IngressBackend,
}
// since nginx ingress controller 0.16.0, it can be run as non-root and doesn't require privileged anymore.
// So we can use securityContext instead of setting privileges via initContainer.
var version string
ingressSplits := strings.SplitN(c.SystemImages.Ingress, ":", 2)
if len(ingressSplits) == 2 {
if strings.HasPrefix(ingressSplits[1], "nginx") {
// new version format nginx-0.25.1-rancher1
version = strings.Split(ingressSplits[1], "-")[1]
} else {
// old version format 0.16.0-rancher1
version = strings.Split(ingressSplits[1], "-")[0]
}
if version < "0.16.0" {
ingressConfig.AlpineImage = c.SystemImages.Alpine
}
}
// Currently only deploying nginx ingress controller
ingressYaml, err := addons.GetNginxIngressManifest(ingressConfig, version)
if err != nil {
return err
}
if err := c.doAddonDeploy(ctx, ingressYaml, IngressAddonResourceName, false); err != nil {
return err
}
log.Infof(ctx, "[ingress] ingress controller %s deployed successfully", c.Ingress.Provider)
return nil
}
func (c *Cluster) removeDNSProvider(ctx context.Context, dnsprovider string) error {
AddonJobExists, err := addons.AddonJobExists(getAddonResourceName(dnsprovider)+"-deploy-job", c.LocalKubeConfigPath, c.K8sWrapTransport)
if err != nil {
return err
}
if AddonJobExists {
log.Infof(ctx, "[dns] removing DNS provider %s", dnsprovider)
if err := c.doAddonDelete(ctx, getAddonResourceName(dnsprovider), false); err != nil {
return err
}
log.Infof(ctx, "[dns] DNS provider %s removed successfully", dnsprovider)
return nil
}
return nil
}
func (c *Cluster) deployDNS(ctx context.Context) error {
for _, dnsprovider := range DNSProviders {
if strings.EqualFold(dnsprovider, c.DNS.Provider) {
continue
}
if err := c.removeDNSProvider(ctx, dnsprovider); err != nil {
return err
}
}
switch DNSProvider := c.DNS.Provider; DNSProvider {
case DefaultDNSProvider:
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", getAddonResourceName(c.DNS.Provider), err)
}
log.Infof(ctx, "[dns] DNS provider %s deployed successfully", c.DNS.Provider)
return nil
case CoreDNSProvider:
if err := c.deployCoreDNS(ctx); err != nil {
if err, ok := err.(*addonError); ok && err.isCritical {
return err
}
log.Warnf(ctx, "Failed to deploy addon execute job [%s]: %v", getAddonResourceName(c.DNS.Provider), err)
}
log.Infof(ctx, "[dns] DNS provider %s deployed successfully", c.DNS.Provider)
return nil
case "none":
return nil
default:
log.Warnf(ctx, "[dns] No valid DNS provider configured: %s", c.DNS.Provider)
return nil
}
}