[CentOS-devel] Vagrant centos/7 v1811.01 breaks nfs at boot

On Sat, Jan 12, 2019 at 4:24 PM Laurențiu Păncescu
<lpancescu at centosproject.org> wrote:
>
> Hi John-Paul,
>
> I think you have a more generic problem, not something affecting just
> the Vagrant images.
>
> On 2019-01-11 22:19, John-Paul Robinson wrote:
> > It seems that the latest vagrant box for centos/7 is breaking nfs
> > mounts at boot.   My vagrant project has an nfs server and client
> > node.  The client has two nfs mount in fstab.
> > https://gitlab.rc.uab.edu/jpr/ohpc_vagrant
> >
> > Using the image from the prior release (1804.02, kernel
> > 3.10.0-862.2.3.el7.x86_64, CentOS Linux release 7.5.1804 (Core) ) the
> > mounts complete successfully.  The newest releases (1811.02 and
> > 1809.01) fail to mount the drives at boot.
>
> We'll go back to using XFS in starting with 1812, but I wouldn't rely on
> timing to see if NFS is going to work or not - that's too fragile.  I
> wasn't able to find an fstab in the Ansible playbooks your repo points
> to, perhaps you could provide a direct link?
>
> Are you already using the _netdev mount option in your fstab?  That
> should make sure that these mounts are only attempted after the network
> is working.  This should be mentioned by 'man systemd-mount', didn't use
> NFS myself though.
>
> Best regards,
> Laurențiu

NFS CIFS, and external USB drives are one of the best places to ue
automount, instead of /etc/fstab. The behavior in case of failures,
and the attempts to restry the mount point, and the absence of the
mountpoint except when the mount is successful, is more useful than
the hardcoded /etc/fstab workarounds.  Not having the mountpoint.
exist helps prevent accidentally writing *under* the NFS mount, while
it is not present, then mounting NFS shares on top of the files. That
can be *nasty*: I ran into it recently with a MySQL share mounted, on
top of a running MySQL.