Re: [sshfs] bridged sshfs hangs

[Miklos S. <mi...@sz...>]

> I am trying to find a solution for a problem we have delivering large
> files to vendors. The problem is, we use AWS - EC2 to package up are
> files -- wich can range from 10 - 40GB -- then they go to a bridged
> server that connects to our vendors. Unfortunately, AWS does not offer
> static IP's, and our vendors require an IP to allow us access through
> the FW.
> 
> I decided to give SSHFS a shot.. and it seems to work fine, except it
> randomly hangs. Is it possible that it's just a server variable I'm
> missing in the ssh config? Or is this just a dumb thing to do
> entirely.
> 
> To recap a bit, my AWS instances build these large packages, and push
> them to my bridged server which I have mounted to our vendors file
> system via sshfs.
> 
> Here is a list of my setup.
> 
> OS - RHEL4
> KERNEL - 2.6.9-55.ELsmp #1 SMP x86_64
> 
> SSHFS version 1.8
> FUSE library version: 2.7.1
> fusermount version: 2.7.1
> using FUSE kernel interface version 7.8
> 
> 
> On the AWS side, in the ssh_config I do have ServerAliveInterval 15 as
> well as on my bridged server.

Very interesting.  This is not a known issue, although there have been
reports of similar hangs, which we didn't manage to track down
completely.

Can you help with debugging this?  It might take a few iterations.

The first thing to try is to enable debugging in the sshfs client with:

   sshfs -odebug,sshfs_debug ...  2> /tmp/sshfs.log

The other thing is, IIRC sftp-server was suspected to play a part in
these hangs.  So a strace might be useful.  After mounting sshfs on
the client you can start strace on the sever:

   strace -o /tmp/sftp-server.strace -p `pidof sftp-server`

Thanks,
Miklos