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adding checks for DNS to ensure connectivity

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This commit is contained in:
afeiszli
2022-02-02 15:33:51 -05:00
committed by 0xdcarns
parent 239b9d36fc
commit cbf709166c
2 changed files with 53 additions and 3 deletions
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21
netclient/functions/daemon.go
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@@ -280,13 +280,16 @@ func NodeUpdate(client mqtt.Client, msg mqtt.Message) {
}
if newNode.DNSOn == "yes" {
ncutils.Log("setting up DNS")
if err = local.UpdateDNS(cfg.Node.Interface, cfg.Network, cfg.Server.CoreDNSAddr); err != nil {
ncutils.Log("error applying dns" + err.Error())
for _, server := range cfg.Node.NetworkSettings.DefaultServerAddrs {
if server.IsLeader {
go setDNS(cfg.Node.Interface, cfg.Network, server.Address)
break
}
}
}
}
//deal with DNS
if newNode.DNSOn != "yes" && shouldDNSChange {
if newNode.DNSOn != "yes" && shouldDNSChange && cfg.Node.Interface != "" {
ncutils.Log("settng DNS off")
_, err := ncutils.RunCmd("/usr/bin/resolvectl revert "+cfg.Node.Interface, true)
if err != nil {
@@ -295,6 +298,18 @@ func NodeUpdate(client mqtt.Client, msg mqtt.Message) {
}
}()
}
func setDNS(iface, network, address string) {
var reachable bool
for counter := 0; !reachable && counter < 5; counter++ {
reachable = local.IsDNSReachable(address)
time.Sleep(time.Second << 1)
}
if !reachable {
ncutils.Log("not setting dns, server unreachable: " + address)
} else if err := local.UpdateDNS(iface, network, address); err != nil {
ncutils.Log("error applying dns" + err.Error())
}
}
// UpdatePeers -- mqtt message handler for peers/<Network>/<NodeID> topic
func UpdatePeers(client mqtt.Client, msg mqtt.Message) {