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kubeadm join: polling discovery service API

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* `kubeadm join` will now retry to connect to the discovery service
API instead of exit on first failure. Allows for parallel install.
of master and slave nodes.
This commit is contained in:
Atanas Mirchev 2016-10-12 16:09:18 +02:00
parent 1c65d1df86
commit 32edc87e4b
1 changed files with 15 additions and 4 deletions
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15
cmd/kubeadm/app/node/discovery.go
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@ -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)
@ -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)
var res *http.Response
wait.PollInfinite(discoveryRetryTimeout, func() (bool, error) {
res, err = http.DefaultClient.Do(req)
if err != nil {
return nil, fmt.Errorf("<node/discovery> failed to request cluster info [%v]", err)
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()