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[kubeadm] pre-flight check hostname to ensure kubelet can launch static pods

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This commit is contained in:
bulletRush 2016-10-30 09:40:33 -04:00
parent 34d6df6893
commit 590ef489c8
2 changed files with 19 additions and 0 deletions
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2
cmd/kubeadm/app/preflight/BUILD
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@ -16,6 +16,8 @@ go_library(
tags = ["automanaged"], tags = ["automanaged"],
deps = [ deps = [
"//cmd/kubeadm/app/apis/kubeadm:go_default_library", "//cmd/kubeadm/app/apis/kubeadm:go_default_library",
"//pkg/api/validation:go_default_library",
"//pkg/util/initsystem:go_default_library", "//pkg/util/initsystem:go_default_library",
"//pkg/util/node:go_default_library",
], ],
) )

17
cmd/kubeadm/app/preflight/checks.go
View File

@ -25,7 +25,9 @@ import (
"os/exec" "os/exec"
kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm" kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
"k8s.io/kubernetes/pkg/api/validation"
"k8s.io/kubernetes/pkg/util/initsystem" "k8s.io/kubernetes/pkg/util/initsystem"
"k8s.io/kubernetes/pkg/util/node"
) )
type PreFlightError struct { type PreFlightError struct {
@ -170,10 +172,24 @@ func (ipc InPathCheck) Check() (warnings, errors []error) {
return nil, nil return nil, nil
} }
// HostnameCheck checks if hostname match dns sub domain regex.
// If hostname doesn't match this regex, kubelet will not launch static pods like kube-apiserver/kube-controller-manager and so on.
type HostnameCheck struct{}
func (hc HostnameCheck) Check() (warnings, errors []error) {
errors = []error{}
hostname := node.GetHostname("")
for _, msg := range validation.ValidateNodeName(hostname, false) {
errors = append(errors, fmt.Errorf("hostname \"%s\" %s", hostname, msg))
}
return nil, errors
}
func RunInitMasterChecks(cfg *kubeadmapi.MasterConfiguration) error { func RunInitMasterChecks(cfg *kubeadmapi.MasterConfiguration) error {
// TODO: Some of these ports should come from kubeadm config eventually: // TODO: Some of these ports should come from kubeadm config eventually:
checks := []PreFlightCheck{ checks := []PreFlightCheck{
IsRootCheck{root: true}, IsRootCheck{root: true},
HostnameCheck{},
ServiceCheck{Service: "kubelet"}, ServiceCheck{Service: "kubelet"},
ServiceCheck{Service: "docker"}, ServiceCheck{Service: "docker"},
PortOpenCheck{port: int(cfg.API.BindPort)}, PortOpenCheck{port: int(cfg.API.BindPort)},
@ -207,6 +223,7 @@ func RunJoinNodeChecks() error {
// TODO: Some of these ports should come from kubeadm config eventually: // TODO: Some of these ports should come from kubeadm config eventually:
checks := []PreFlightCheck{ checks := []PreFlightCheck{
IsRootCheck{root: true}, IsRootCheck{root: true},
HostnameCheck{},
ServiceCheck{Service: "docker"}, ServiceCheck{Service: "docker"},
ServiceCheck{Service: "kubelet"}, ServiceCheck{Service: "kubelet"},
PortOpenCheck{port: 10250}, PortOpenCheck{port: 10250},