diff --git a/tailnet/controllers.go b/tailnet/controllers.go
index e0a57660624e2..832baf09cddf5 100644
--- a/tailnet/controllers.go
+++ b/tailnet/controllers.go
@@ -883,23 +883,30 @@ type Workspace struct {
}
// updateDNSNames updates the DNS names for all agents in the workspace.
+// DNS hosts must be all lowercase, or the resolver won't be able to find them.
+// Usernames are globally unique & case-insensitive.
+// Workspace names are unique per-user & case-insensitive.
+// Agent names are unique per-workspace & case-insensitive.
func (w *Workspace) updateDNSNames() error {
+ wsName := strings.ToLower(w.Name)
+ username := strings.ToLower(w.ownerUsername)
for id, a := range w.agents {
+ agentName := strings.ToLower(a.Name)
names := make(map[dnsname.FQDN][]netip.Addr)
// TODO: technically, DNS labels cannot start with numbers, but the rules are often not
// strictly enforced.
- fqdn, err := dnsname.ToFQDN(fmt.Sprintf("%s.%s.me.coder.", a.Name, w.Name))
+ fqdn, err := dnsname.ToFQDN(fmt.Sprintf("%s.%s.me.coder.", agentName, wsName))
if err != nil {
return err
}
names[fqdn] = []netip.Addr{CoderServicePrefix.AddrFromUUID(a.ID)}
- fqdn, err = dnsname.ToFQDN(fmt.Sprintf("%s.%s.%s.coder.", a.Name, w.Name, w.ownerUsername))
+ fqdn, err = dnsname.ToFQDN(fmt.Sprintf("%s.%s.%s.coder.", agentName, wsName, username))
if err != nil {
return err
}
names[fqdn] = []netip.Addr{CoderServicePrefix.AddrFromUUID(a.ID)}
if len(w.agents) == 1 {
- fqdn, err := dnsname.ToFQDN(fmt.Sprintf("%s.coder.", w.Name))
+ fqdn, err := dnsname.ToFQDN(fmt.Sprintf("%s.coder.", wsName))
if err != nil {
return err
}
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