Skip to content

[client] Add env var to skip DNS probing #5270

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
lixmal merged 1 commit into from
Feb 9, 2026
Merged

[client] Add env var to skip DNS probing #5270

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
15 changes: 15 additions & 0 deletions client/internal/dns/server.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,9 @@ import (
"fmt"
"net/netip"
"net/url"
"os"
"runtime"
"strconv"
"strings"
"sync"

Expand All @@ -27,6 +29,8 @@ import (
"github.com/netbirdio/netbird/shared/management/domain"
)

const envSkipDNSProbe = "NB_SKIP_DNS_PROBE"

// ReadyListener is a notification mechanism what indicate the server is ready to handle host dns address changes
type ReadyListener interface {
OnReady()
Expand Down Expand Up @@ -439,6 +443,17 @@ func (s *DefaultServer) SearchDomains() []string {
// ProbeAvailability tests each upstream group's servers for availability
// and deactivates the group if no server responds
func (s *DefaultServer) ProbeAvailability() {
if val := os.Getenv(envSkipDNSProbe); val != "" {
skipProbe, err := strconv.ParseBool(val)
if err != nil {
log.Warnf("failed to parse %s: %v", envSkipDNSProbe, err)
}
if skipProbe {
log.Infof("skipping DNS probe due to %s", envSkipDNSProbe)
return
}
}

var wg sync.WaitGroup
for _, mux := range s.dnsMuxMap {
wg.Add(1)
Expand Down
Loading