Re: [MooseFS-Users] mfsmaster config reload breaks client mounts?

[Aleksander W. <ale...@mo...>]

Hi,
This sounds really odd.
Another problem is that we are not able to repeat this scenario.
Can you provide us system log from MooseFS master server.
Maybe this will tell us something more.

I'm looking forward to hearing from you.
Aleksander Wieliczko

On 14.09.2016 22:29, Wilson, Steven M wrote:
>
> Hi Aleksander,
>
>
> I needed to add another line to mfsexports.cfg today.  I didn't change 
> any existing lines; I just added the following line:
>
>     10.163.216.88   /       rw,alldirs,maproot=0
>
>
> After adding this line, I took a deep breath and then sent a HUP 
> signal to the mfsmaster process.  ​Rats...  all the clients for that 
> MooseFS server immediately had empty mount points.
>
>
> This occurred on a different MooseFS master server than the one 
> mentioned in my original email.  The version of this mfsmaster is 
> 3.0.78.  This time I did not use Ansible but instead manually edited 
> the mfsexports.cfg file and manually sent a HUP signal to mfsmaster 
> process.
>
>
> Unfortunately, this looks like a reproducible problem in my 
> environment and not just a one-time fluke.
>
>
> Is there any additional information that I can send to be of help to 
> you? The clients and server are running on Ubuntu 16.04.
>
>
> Best regards,
>
> Steve
>
>
> ------------------------------------------------------------------------
> *From:* Wilson, Steven M <st...@pu...>
> *Sent:* Monday, September 12, 2016 9:28 AM
> *To:* Aleksander Wieliczko; Krzysztof Kielak
> *Cc:* MooseFS-Users
> *Subject:* Re: [MooseFS-Users] mfsmaster config reload breaks client 
> mounts?
>
> ​Hi Aleksander,
>
>
> Thanks for attempting to reproduce the problem in your environment. 
>  I'll send the mfsexports.cfg files to you (prior to the change and 
> after the change).  I use Ansible for configuration management and I 
> normally make all changes on my Ansible server in a file of my own 
> format that is then used to build mfsexports.cfg files on each MooseFS 
> master server.  So I'll also send the script that Ansible calls to 
> build the mfsexports.cfg file and issue a HUP signal to mfsmaster.
>
>
> Thanks,
>
>
> Steve
>
>
> ------------------------------------------------------------------------
> *From:* Aleksander Wieliczko <ale...@mo...>
> *Sent:* Monday, September 12, 2016 6:25 AM
> *To:* Wilson, Steven M; Krzysztof Kielak
> *Cc:* MooseFS-Users
> *Subject:* Re: [MooseFS-Users] mfsmaster config reload breaks client 
> mounts?
> Hi,
>
> I would like to inform you that we are not able to reproduce this 
> problem in our development environment.
> Also I would like to add that in MooseFS is scenario which can cause 
> mfsmount session drop.
> When you change permissions in mfsexports.cfg file for connected 
> mounts and you send HUP signal, MooseFS master will check permissions 
> again, and if permissions have been changed access to cluster will be 
> denied.
>
> We have another question for you.
> Can you send us old and new "mfsexports.cfg" files, so we will be able 
> to understand what had happened?
>
> You can send itto dwt[at]moosefs.com
>
> Best regards
> Aleksander Wieliczko
> Technical Support Engineer
> MooseFS.com <moosefs.com>