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kubeadm join: polling discovery service API #34718

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Oct 15, 2016
Merged

kubeadm join: polling discovery service API #34718

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19 changes: 15 additions & 4 deletions cmd/kubeadm/app/node/discovery.go
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Original file line number Diff line number Diff line change
Expand Up @@ -22,11 +22,16 @@ import (
"fmt"
"io"
"net/http"
"time"

jose "github.com/square/go-jose"
kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
"k8s.io/kubernetes/pkg/util/wait"
)

// the amount of time to wait between each request to the discovery API
const discoveryRetryTimeout = 5 * time.Second

func RetrieveTrustedClusterInfo(s *kubeadmapi.NodeConfiguration) (*kubeadmapi.ClusterInfo, error) {
host, port := s.MasterAddresses[0], 9898
requestURL := fmt.Sprintf("http://%s:%d/cluster-info/v1/?token-id=%s", host, port, s.Secrets.TokenID)
Expand All @@ -37,10 +42,16 @@ func RetrieveTrustedClusterInfo(s *kubeadmapi.NodeConfiguration) (*kubeadmapi.Cl

fmt.Printf("<node/discovery> created cluster info discovery client, requesting info from %q\n", requestURL)

res, err := http.DefaultClient.Do(req)
if err != nil {
return nil, fmt.Errorf("<node/discovery> failed to request cluster info [%v]", err)
}
var res *http.Response
wait.PollInfinite(discoveryRetryTimeout, func() (bool, error) {
res, err = http.DefaultClient.Do(req)
if err != nil {
fmt.Printf("<node/discovery> failed to request cluster info, will try again: [%s]\n", err)
return false, nil
}
return true, nil
})

buf := new(bytes.Buffer)
io.Copy(buf, res.Body)
res.Body.Close()
Expand Down