Hi.

On Tue, 31 Jul 2018 10:42:42 -0700 Rick Stevens wrote:

> On 07/31/2018 10:23 AM, francis.montag...@inria.fr wrote:
>>> If you don't have the automount stuff, I think the most reliable thing
>>> is to give your client a fixed IP/netmask/gateway combination. ...

>> This may not be sufficient: I had a client with fixed IP configuration
>> that fails to mount an NFS server at boot.

> Yes, I realize this. This is one of the issues with systemd in general,
> it parallelizes stuff and causes these race conditions.

Not quite the problem IMO. systemd parallelizes yes, but offers
(various) ways to specify dependencies for proper ordering.

This problem is here with NetworkManager that starts
asynchronously. Note also that NetworkManager was adopted far before
systemd.

And thanks to systemd to allow overloading/overriding the
configurations of the system *without* modifying a configuration file
but by adding a drop-in .conf file.

In this case, it allows you to specify what you want for
"the network is up". One may for example extend this from:

the default:

   nm-online -s -q --timeout=30

to (the choice I made):

   routes defined and gateway reachable

or to:

   routes defined and gateway reachable and DNS servers reachable

-- 
francis
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