On Aug 1, 2016, at 2:56 AM, Kurt Roeckx <k...@roeckx.be> wrote: > On Mon, Aug 01, 2016 at 02:37:58AM -0700, Rick Thomas wrote: >> This 8 year old bug is still present in jessie and stretch -- the change to >> systemd did not fix it! >> >> Please, somebody pay attention! This bug makes ntpd unreliable tending to >> useless on systems that get their network config from dhcp. > > There are various things broken, but as far as I know in stretch > things should just work. > > You seem to say that this is related to getting the ntp servers > from dhcp, but that's not making sense to me. The dhcp server > should give you IP addresses, so it can never be a problem with > DNS, the peers should always be there. > > > Kurt
I’ll try it again in sid and stretch, but it was there the last time I looked. The problem is not getting dhcpclient to give ntp servers. I’ve put hard coded ipv4 addresses in /etc/default/ntpdate, so that’s not it. The problem is that the network interface is not fully available when ntpdate runs. I think this is because dhcpclient has not provided an IP address for the interface yet. Here’s a snatch from journalctl that shows the problem in jessie: > Aug 01 02:49:46 dillserver kernel: sungem_phy: PHY ID: 206053, addr: 0 > Aug 01 02:49:46 dillserver kernel: gem 0002:20:0f.0 eth0: Found BCM5401 PHY > Aug 01 02:49:46 dillserver kernel: IPv6: ADDRCONF(NETDEV_UP): eth0: link is > not ready > Aug 01 02:49:46 dillserver ntpdate[661]: no servers can be used, exiting > Aug 01 02:49:46 dillserver networking[469]: Configuring network > interfaces...done. > Aug 01 02:49:46 dillserver systemd[1]: Started LSB: Raise network interfaces.. > Aug 01 02:49:46 dillserver systemd[1]: Starting ifup for eth0... > Aug 01 02:49:46 dillserver systemd[1]: Started ifup for eth0. > Aug 01 02:49:46 dillserver systemd[1]: Starting Network. > Aug 01 02:49:46 dillserver systemd[1]: Reached target Network. > Aug 01 02:49:46 dillserver systemd[1]: Starting Network is Online. > Aug 01 02:49:46 dillserver systemd[1]: Reached target Network is Online. > Aug 01 02:49:46 dillserver systemd[1]: Starting LSB: RPC portmapper > replacement... > Aug 01 02:49:47 dillserver rpcbind[672]: Starting rpcbind daemon.... > Aug 01 02:49:47 dillserver systemd[1]: Started LSB: RPC portmapper > replacement. > Aug 01 02:49:47 dillserver systemd[1]: Starting RPC Port Mapper. > Aug 01 02:49:47 dillserver systemd[1]: Reached target RPC Port Mapper. > Aug 01 02:49:47 dillserver systemd[1]: Starting LSB: NFS support files common > to client and server... > Aug 01 02:49:47 dillserver dhclient[685]: Internet Systems Consortium DHCP > Client 4.3.1 > Aug 01 02:49:47 dillserver dhclient[685]: Copyright 2004-2014 Internet > Systems Consortium. > Aug 01 02:49:47 dillserver dhclient[685]: All rights reserved. > Aug 01 02:49:47 dillserver dhclient[685]: For info, please visit > https://www.isc.org/software/dhcp/ > Aug 01 02:49:47 dillserver dhclient[685]: > Aug 01 02:49:47 dillserver ifup[671]: Internet Systems Consortium DHCP Client > 4.3.1 > Aug 01 02:49:47 dillserver ifup[671]: Copyright 2004-2014 Internet Systems > Consortium. > Aug 01 02:49:47 dillserver ifup[671]: All rights reserved. > Aug 01 02:49:47 dillserver ifup[671]: For info, please visit > https://www.isc.org/software/dhcp/ > Aug 01 02:49:47 dillserver dhclient[685]: Listening on > LPF/eth0/00:03:93:3d:bd:bc > Aug 01 02:49:47 dillserver dhclient[685]: Sending on > LPF/eth0/00:03:93:3d:bd:bc > Aug 01 02:49:47 dillserver dhclient[685]: Sending on Socket/fallback > Aug 01 02:49:47 dillserver dhclient[685]: DHCPDISCOVER on eth0 to > 255.255.255.255 port 67 interval 4 > Aug 01 02:49:47 dillserver ifup[671]: Listening on LPF/eth0/00:03:93:3d:bd:bc > Aug 01 02:49:47 dillserver ifup[671]: Sending on LPF/eth0/00:03:93:3d:bd:bc > Aug 01 02:49:47 dillserver ifup[671]: Sending on Socket/fallback > Aug 01 02:49:47 dillserver ifup[671]: DHCPDISCOVER on eth0 to 255.255.255.255 > port 67 interval 4 Rick
