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add hostname check in kubeadm join: warning log only

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Co-authored-by: Lubomir I. Ivanov <neolit123@gmail.com>
This commit is contained in:
pacoxu 2021-02-18 17:51:23 +08:00
parent 4f1dd5d2fb
commit 2c89fa4a59
2 changed files with 7 additions and 1 deletions
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1
cmd/kubeadm/app/preflight/BUILD
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@ -25,6 +25,7 @@ go_library(
"//cmd/kubeadm/app/util/runtime:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/util/net:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/util/sets:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/util/validation:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/util/version:go_default_library",
"//staging/src/k8s.io/component-base/version:go_default_library",
"//vendor/github.com/PuerkitoBio/purell:go_default_library",

7
cmd/kubeadm/app/preflight/checks.go
View File

@ -38,6 +38,7 @@ import (
"github.com/pkg/errors"
netutil "k8s.io/apimachinery/pkg/util/net"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/validation"
versionutil "k8s.io/apimachinery/pkg/util/version"
kubeadmversion "k8s.io/component-base/version"
"k8s.io/klog/v2"
@ -402,8 +403,12 @@ func (HostnameCheck) Name() string {
}
// Check validates if hostname match dns sub domain regex.
// Check hostname length and format
func (hc HostnameCheck) Check() (warnings, errorList []error) {
klog.V(1).Infoln("checking whether the given node name is reachable using net.LookupHost")
klog.V(1).Infoln("checking whether the given node name is valid and reachable using net.LookupHost")
for _, msg := range validation.IsQualifiedName(hc.nodeName) {
warnings = append(warnings, errors.Errorf("invalid node name format %q: %s", hc.nodeName, msg))
}
addr, err := net.LookupHost(hc.nodeName)
if addr == nil {