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Full Discussion: Help with autos and mount bind
Homework and Emergencies Emergency UNIX and Linux Support Help with autos and mount bind Post 302919391 by maverick_here on Wednesday 1st of October 2014 01:44:29 AM
Old 10-01-2014
RedHat Help with autos and mount bind
I have a sftp server running on Centos 5.10. It servers as upload/download interface for three users who basically are chrooted to three different locations.
Code:
User A -- >  /home/REGIONA/

User B -- > /home/REGIONB/

User C -- > /home/REGIONC/

The users run certain application procedures on app servers and on the app servers the code uploads data to the sftp server, there are three app servers for three users

Say
Code:
APP server A

APP server B

App server C

I have setup the autofs mounts on the Apps servers, where the application code upon completion will go to the mount point and dump the data


example


Code:
/sftp/REGIONA/upload   --> from APP server A

/sftp/REGIONB/upload   --> from APP server B

/sftp/REGIONC/upload  --> from APP server C

Everything works fine.


Now coming to the issue, I have a requirement of making the "UPLOAD" region common across all the three app servers so what i did was


mkdir /opt/upload

Code:
mount -o bind,rw /opt/upload /home/REGIONA/upload

mount -o bind,rw /opt/upload /home/REGIONB/upload

mount -o bind,rw /opt/upload /home/REGIONC/upload

Now, this works OK if i upload data from filezilla/winscp


However from the App servers which do a autofs mount of the remote ( sftp ) servers filesystems , they are not recognizing upload to be a bound mount.When I upload data
programmatically from the app servers the data si not visible


for example

From APP server A I run the script / application code

I does not show up on /home/REGIONA/upload

and when I umount /home/REGIONA/upload, it shows up.


I figure its an issue with autofs recognizing an underlying mount binded sub directory on the remote filesystem.

Any ideas ?
 

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LEARN ABOUT LINUX

sftp-server

SFTP-SERVER(8)						    BSD System Manager's Manual 					    SFTP-SERVER(8)

NAME

     sftp-server -- SFTP server subsystem

SYNOPSIS

     sftp-server [-ehR] [-f log_facility] [-l log_level] [-u umask]

DESCRIPTION

     sftp-server is a program that speaks the server side of SFTP protocol to stdout and expects client requests from stdin.  sftp-server is not
     intended to be called directly, but from sshd(8) using the Subsystem option.

     Command-line flags to sftp-server should be specified in the Subsystem declaration.  See sshd_config(5) for more information.

     Valid options are:

     -e      Causes sftp-server to print logging information to stderr instead of syslog for debugging.

     -f log_facility
	     Specifies the facility code that is used when logging messages from sftp-server.  The possible values are: DAEMON, USER, AUTH,
	     LOCAL0, LOCAL1, LOCAL2, LOCAL3, LOCAL4, LOCAL5, LOCAL6, LOCAL7.  The default is AUTH.

     -h      Displays sftp-server usage information.

     -l log_level
	     Specifies which messages will be logged by sftp-server.  The possible values are: QUIET, FATAL, ERROR, INFO, VERBOSE, DEBUG, DEBUG1,
	     DEBUG2, and DEBUG3.  INFO and VERBOSE log transactions that sftp-server performs on behalf of the client.	DEBUG and DEBUG1 are
	     equivalent.  DEBUG2 and DEBUG3 each specify higher levels of debugging output.  The default is ERROR.

     -R      Places this instance of sftp-server into a read-only mode.  Attempts to open files for writing, as well as other operations that
	     change the state of the filesystem, will be denied.

     -u umask
	     Sets an explicit umask(2) to be applied to newly-created files and directories, instead of the user's default mask.

     For logging to work, sftp-server must be able to access /dev/log.	Use of sftp-server in a chroot configuration therefore requires that
     syslogd(8) establish a logging socket inside the chroot directory.

SEE ALSO

     sftp(1), ssh(1), sshd_config(5), sshd(8)

     T. Ylonen and S. Lehtinen, SSH File Transfer Protocol, draft-ietf-secsh-filexfer-00.txt, January 2001, work in progress material.

HISTORY

     sftp-server first appeared in OpenBSD 2.8.

AUTHORS

     Markus Friedl <markus@openbsd.org>

BSD
								  January 9, 2010							       BSD
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