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• OpenSSL error while running punjab

  - by Hunt

  i ran punjab - BOSH connection manager - using twistd -y punjab.tac command in my centos but i am getting following error Unhandled Error Traceback (most recent call last): File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 652, in run runApp(config) File "/usr/local/lib/python2.7/site-packages/twisted/scripts/twistd.py", line 23, in runApp _SomeApplicationRunner(config).run() File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 386, in run self.application = self.createOrGetApplication() File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 451, in createOrGetApplication application = getApplication(self.config, passphrase) --- <exception caught here> --- File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 462, in getApplication application = service.loadApplication(filename, style, passphrase) File "/usr/local/lib/python2.7/site-packages/twisted/application/service.py", line 405, in loadApplication application = sob.loadValueFromFile(filename, 'application', passphrase) File "/usr/local/lib/python2.7/site-packages/twisted/persisted/sob.py", line 210, in loadValueFromFile exec fileObj in d, d File "punjab.tac", line 39, in <module> '/etc/pki/tls/cert.pem', File "/usr/local/lib/python2.7/site-packages/twisted/internet/ssl.py", line 68, in __init__ self.cacheContext() File "/usr/local/lib/python2.7/site-packages/twisted/internet/ssl.py", line 78, in cacheContext ctx.use_privatekey_file(self.privateKeyFileName) OpenSSL.SSL.Error: [('x509 certificate routines', 'X509_check_private_key', 'key values mismatch')] Failed to load application: [('x509 certificate routines', 'X509_check_private_key', 'key values mismatch')] my configuration file of punjab is sslContext = ssl.DefaultOpenSSLContextFactory( '/etc/pki/tls/private/ca.key', '/etc/pki/tls/cert.pem', ) How can i resolve above error

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• Strange ssh key issue

  - by user55714

  Scenario 1. I am doing this from /home/deploy directory I am trying to set up ssh with github for capistrano deployment. this has been an absolute nightmare. when I do ssh [email protected] as the deploy account I get Permission denied (publickey). so may be the key is not being found, so If I do a ssh-add /home/deploy/.ssh/id_rsa Could not open a connection to your authentication agent. (i did verify that the ssh-agent was running) If I do exec ssh-agent bash and then repeat the ssh-add then the key does get added and I can ssh into github. Now I exit from the ssh connection to my server and ssh back in and I can't ssh into github anymore! Scenario 2 if I login to my remote server and then cd into my .ssh directory and ssh into github then it all works fine I guess there is a problem with locating the key and for some reason the agent isn't funcitoning correctly. Any ideas? Her is a pastie with more details..my .bashrc, permissions etc. http://pastie.org/pastes/1190557/

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• Connection between Asp.Net and Oracle 10g Express Edition

  - by l3gion

  Hello, I'm struggling to find a way to connect my Asp .Net + C# application with my Oracle 10g Express Edition. Here's my scenario, I'm at Mac OS and I have 2 Virtual machines, one for Win 7 (VS 2010 app) and another with a Parallels Virtual Appliance with Oracle 10g Express Edition 1.1. Which provider (Oledb, ODP.NET, etc..) should I use? How to make the connection to the server in C#? Right now I have this: <appSettings> <add key="conn" value="Data Source=10.211.55.11;Persist Security Info=True;User ID=l3gion;Password=l3gion;" /> </appSettings> And at the .cs file: SqlCommand cmd = new SqlCommand("insert_thing", new SqlConnection(ConfigurationManager.AppSettings["conn"])); cmd.CommandType = CommandType.StoredProcedure; *insert_thing is a stored procedure Using this I got this error: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) I've searched for some possible solutions. Tried some, including: firewall disabled, allow remote connection at oracle express edition using this cmd line ("EXEC DBMS_XDB.SETLISTENERLOCALACCESS(FALSE);").. The error persists. Can anyone guide me into the right direction? I'm a newbie with this type of things. Thank you for your patience. regards

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• Can't get php+sqlite working

  - by facha

  Hi, everyone I'm struggling all morning to make php work with an sqlite database. Here is a piece of php code that I try to execute: #less /var/www/html/test.php <?php $db=new PDO("sqlite:/var/www/test.sql"); $sql = "insert into test (login,pass) values ('login','pass');"; $db->exec($sql); ?> Here is how I've done tests: # sqlite3 /var/www/test.sql sqlite> create table test (login varchar,pass varchar); #chown apache:apache /var/www/test.sql #chmod 644 /var/www/test.sql Here is the stuff that drives me mad: When I execute from command line: #php test.php everything goes well. Sql is being executed and I can see a new row appear in the database. When I execute the same script from a browser - sql is not being executed. I don't get a new row in the database. There are no errors in the apache log file. Please, help

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• Error on LDAP Login - xsessions error - Session lasted less than 10 seconds

  - by Draineh

  I have two machines both running CentOS 5.6 64bit. On the LDAP Machine it has a DHCP, BIND and OpenLDAP Server. LDAP is correctly configured and users can authenticate against it. Using root I configure machine 2 to use LDAP for authentication and when trying to log in it successfully authenticates against a saved user on the LDAP Server but produces the following errors and then throws me back to the login screen. I can still sign in as root and use the machine as normal. The syslog doesn't show any errors and I disabled SELinux to see if it was interfering. The error; Your session only lasted less than 10 seconds. If you have not lgoged out yourself, this could mean that there is some installation problem or that you may be out of diskspace. Try logging in with one of the failsafe sessions to see if you can fix this problem. There is then a tickbox to view the contents of ~/.xsessions-errors which contains; /etc/gdm/PreSession/Default: Registering your session with utmp /etc/gdm/PreSession/Default: running: /usr/bin/sessreg -a -u /var/run/utmp -x "/var/gdm:0:Xservers" -h "" -l ":0" "admin" localuser:admin being added to access control list No profile for user 'admin' found /bin/sh: /usr/bin/dbus-launch --exit-with-session /etc/X11/Xinit/Xclients: No such file or directory /bin/sh: line 0: exec: /usr/bin/dbus-launch --exit-with-session /etc/X11/xinit/Xclients: cannot execute: No such file or directory Apologies if someone notices something isn't spelt quite right or doesn't sound right, the system never actually creates or saves this file so I have had to type it across from the screen. Through the authentication panel in CentOS on the client I have set it to create the users home directory on login. The user is being correctly authenticated and the /home/admin folder has been created but this error would suggest it has not? The client is a new install on an 80gb hard drive so there is well over 80% of the drive still available. Thanks for any suggestions or pointers.

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• How to autorun wpa_supplicant on Debian startup

  - by The Electric Muffin

  I'd like to run wpa_supplicant -D wext -i wlan0 -c /etc/wpa_supplicant.conf on Debian startup (runlevels 2-5). I found some vague instructions from a related question that said to put a script in /etc/init.d/ and then symlink to it from the apropriate /etc/rcRUNLEVEL.d/ directories. However, I noticed that there are already some files named "wpasupplicant" that probably run at startup: /etc/network/if-down.d/wpasupplicant /etc/network/if-post-down.d/wpasupplicant /etc/network/if-pre-up.d/wpasupplicant /etc/network/if-up.d/wpasupplicant They all are symlinks to the same script, /etc/wpa_supplicant/ifupdown.sh. It has a comment at the beginning saying it "[...] allows ifup(8), and ifdown(8) to manage wpa_supplicant(8) and wpa_cli(8) processes running in daemon mode." However, the closest it gets to calling wpa_supplicant itself is (in functions.sh): WPA_SUP_BIN="/sbin/wpa_supplicant" [snip] start-stop-daemon --start --oknodo $DAEMON_VERBOSITY \ --name $WPA_SUP_PNAME --startas $WPA_SUP_BIN --pidfile $WPA_SUP_PIDFILE \ -- $WPA_SUP_OPTIONS $WPA_SUP_CONF [snip] start-stop-daemon --stop --oknodo $DAEMON_VERBOSITY \ --exec $WPA_SUP_BIN --pidfile $WPA_SUP_PIDFILE Does that mean it's safe to make an init.d script for wpa_supplicant, and if so what would it look like? General info: Debian Squeeze (5.0) official wpasupplicant package (v0.6.10-2.1) The full contents of my system's functions.sh and ifupdown.sh are here (dependent, of course, on my system's uptime—it's a five-year-old laptop that greatly enjoys overheating): functions.sh ifupdown.sh

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• Amavisd-new(2.6.4-3) failing to do "lookup_sql_dsn" when large number of emails are need to be accessed

  - by sandip

  Amavis is failing to do sql lookup when large number of emails are sent to amavis. Its throwing out error after scanning 40 to 50 email. It shows error like. (!!)TROUBLE in process_request: sql exec: err=7, 57P01,DBD::Pg::st bind_param failed:FATAL: terminating connection due to administrator command\nSSL connection has been closed unexpectedly at (eval 103) line 164, <GEN50> line 5. at (eval 104) line 280, <GEN50> line 5. As soon as this error appears in the logs, Amavis stops and port 10024 is closed. Thinking it to an error due to ssl connection in the database(postgresql-8.4), i had stopped ssl in postgres, but it was of no use. I have tried to configure amavis on another server, but i got the same error again. This happening on a production server, So i am not being able to scan emails as per user settings. Anybody have any idea, what may be the source of this error ?? Please help. Thanks in advance

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• How Would I Restrict a Linux Binary to a Limited Amount of RAM?

  - by Ken S.

  I would like to be able to limit an installed binary to only be able to use up to a certain amount of RAM. I don't want it to get killed if it exceeds it, only that that would be the max amount that it could use. The problem I am facing is that I am running an Apache 2.2 server with PHP and some custom code that a developer is writing for us. The problem is that somewhere in there code they launch a PHP exec call that launches ImageMagick's 'convert' to create a resized image file. I'm not privy to a lot of details to the project or the code, but need to find a solution to keep them from killing the server until they can find a way to optimize the code. I had thought that I could do this with /etc/security/limits.conf and setting a limit on the apache user, but it seems to have no effect. This is what I used: www-data hard as 500 If I understand it correctly, this should have limited any apache user process to a maximum to 500kb, however, when I ran a test script that would chew up a lot of RAM, this actually got up to 1.5GB before I killed it. Here is the output of 'ps auxf' after the setting change and a system reboot: USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 5268 0.0 0.0 401072 10264 ? Ss 15:28 0:00 /usr/sbin/apache2 -k start www-data 5274 0.0 0.0 402468 9484 ? S 15:28 0:00 \_ /usr/sbin/apache2 -k start www-data 5285 102 9.4 1633500 1503452 ? Rl 15:29 0:58 | \_ /usr/bin/convert ../tours/28786/.…. www-data 5275 0.0 0.0 401072 5812 ? S 15:28 0:00 \_ /usr/sbin/apache2 -k start Next I thought I could do it with Apache's RlimitMEM setting, but get the same result of it not getting limited. Here is what I have in my apache.conf file: RLimitMEM 500000 512000 It wasn't until many hours later that I figured out that if the process actually reached that amount that it would die with an OOM error. Would love any ideas on how to set this limit so other things could function on the server, and all of them could play together nicely.

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• Adding file to /etc/cron.d doesn't make it run (ubuntu 10.04)

  - by tom

  If I scp a cron file into /etc/cron.d it doesn't run unless I edit the file and change the command. Then crond seems to pick up the cron file. How can I make cron reload its cron files in ubuntu 10.04? 'touch'ing the file doesn't work nor does 'restart cron' or 'reload cron'. My cron file is set to run every minute and logs to a file. Nothing ends up in the log file until I edit the command, and there's no entry for it in /var/log/syslog I'm stumped. Here's my cron file saved to /etc/cron.d/runscript # Runs the script every minute. This is safe because it will exit with success if it's already running * * * * * www-data if [ -f /usr/local/bin/thing ]; then exec /usr/bin/php /usr/local/bin/thing mode:prod -a 14 -d >> /var/log/thing/mything.log 2>&1; else echo `date +'[%D %T]'` "Thing not deployed. Command not run\n" >> /var/log/thing/mything.log; fi &

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• How to use a common library of environment variables among different languages?

  - by JDS

  We have three main languages with which we perform system tasks: Bash, Ruby, and PHP, and Perl. Four, four main languages. We use managed environment variables to provide authorization info that automated scripts need. For example, a mysql user account and password. We'd like to use one single managed file to maintain these variables. In some instances, for example, in cron, these environment variables are not available. They are made available in CLI scripts because we source the env file in everyone's profile. But something like cron doesn't do that. On the CLI, when the env file is sourced, any given script can access those variables. Bash has them directly, PHP in $_ENV, ruby in ENV, etc. We can't source the file into non-Bash scripts, because most languages implement shell commands by running them in a subshell. We considered parsing the Bash, converting to the script's lang, and running the equivalent of "exec(parsed_output)" on the resulting strings. What is a good solution to providing managed environment vars to scripts running in cron, or similar?

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• Connecting SVN from Remote Server

  - by Ashish

  I have hosted my repository in assebbla & it works fine. now I want to write a script that can automate the build process : 1. Take the code from assembla repository 2. Make a dump and copy it onto my web server. what I have researched from net states that use of commands like svn co svn+ssh://[email protected]/home/svn/test I believe I need to open Shell on my server and type these commands but shell has been disabled from my server admin. I tried to run the same from php using exec , admin has disabled that too. (am using shared hosting and want to do a automated deployment using these simple steps. i don't want to bring my local system in this process) now am not sure even if I get the shell access open to my server these commands like svn will work there as I don't have SVN installed on my server (its installed on assembla). kindly let me know if any more explanation is required regarding the same or if am going on the wrong track. Am a newbie so please be descriptive in answering :) Thanx in advance Ace

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• How to reduce celeryd memory consumption?

  - by Gringo Suave

  I'm using celery 2.5.1 with django on a micro ec2 instance with 613mb memory and as such have to keep memory consumption down. Currently I'm using it only for the scheduler "celery beat" as a web interface to cron, though I hope to use it for more in the future. I've noticed it is the biggest consumer of memory on my micro machine even though I have configured the number of workers to one. I don't have many other options set in settings.py: import djcelery djcelery.setup_loader() BROKER_BACKEND = 'djkombu.transport.DatabaseTransport' CELERYBEAT_SCHEDULER = 'djcelery.schedulers.DatabaseScheduler' CELERY_RESULT_BACKEND = 'database' BROKER_POOL_LIMIT = 2 CELERYD_CONCURRENCY = 1 CELERY_DISABLE_RATE_LIMITS = True CELERYD_MAX_TASKS_PER_CHILD = 20 CELERYD_SOFT_TASK_TIME_LIMIT = 5 * 60 CELERYD_TASK_TIME_LIMIT = 6 * 60 Here's the details via top: PID USER NI CPU% VIRT SHR RES MEM% Command 1065 wuser 10 0.0 283M 4548 85m 14.3 python manage_prod.py celeryd --beat 1025 wuser 10 1.0 577M 6368 67m 11.2 python manage_prod.py celeryd --beat 1071 wuser 10 0.0 578M 2384 62m 10.6 python manage_prod.py celeryd --beat That's about 214mb of memory (and not much shared) to run a cron job occasionally. Have I done anything wrong, or can this be reduced about ten-fold somehow? ;) Update: here's my upstart config: description "Celery Daemon" start on (net-device-up and local-filesystems) stop on runlevel [016] nice 10 respawn respawn limit 5 10 chdir /home/wuser/wuser/ env CELERYD_OPTS=--concurrency=1 exec sudo -u wuser -H /usr/bin/python manage_prod.py celeryd --beat --concurrency=1 --loglevel info --logfile /var/tmp/celeryd.log Update 2: I notice there is one root process, one user child process, and two grandchildren from that. So I think it isn't a matter of duplicate startup. root 34580 1556 sudo -u wuser -H /usr/bin/python manage_prod.py celeryd wuser 577M 67548 +- python manage_prod.py celeryd --beat --concurrency=1 wuser 578M 63784 +- python manage_prod.py celeryd --beat --concurrency=1 wuser 271M 76260 +- python manage_prod.py celeryd --beat --concurrency=1

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• Port to use CentOS init.d functions

  - by jcalfee314

  What are good equivalent centos commands using functions in /etc/init.d/functions such as daemon to perform the following tasks? STARTCMD='start-stop-daemon --start --exec /usr/sbin/swapspace --quiet --pidfile /var/run/swapspace.pid -- -d -p' STOPCMD='start-stop-daemon --stop --oknodo --quiet --pidfile /var/run/swapspace.pid' It looks like daemon will work for the start command and killproc is used for the stop command. . /etc/init.d/functions pushd /usr/sbin daemon --pidfile /var/run/swapspace.pid /usr/sbin/swapspace . /etc/init.d/functions killproc -p $(cat /var/run/swapspace.pid) Would the --oknodo be needed in the CentOS env (the swap file is really only boot-time)? "oknodo - Return exit status 0 instead of 1 if no actions are (would be) taken." I don't see quiet in daemon or killproc, I can't imagine that it would matter though. The original start-stop-daemon for swapspace seems to have both -p and --pidfile (the same command). That must be an error. Did I miss anything? Any idea why daemon not create the pid file?

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• Mounting fuse sshfs fails when invoked by Cron on FreeBSD 9.0

  - by Tal

  I have a remote server filesystem that I'm attempting to mount locally on a FreeBSD 9 machine via FUSE sshfs, and Cron for a backup routine. I have ssh keys between the boxes setup to allow for passwordless login as the root user on the local machine. Cron is set to run the following script (in Root's crontab): #!/bin/sh echo "Mounting Share" /usr/local/bin/sshfs -C -o reconnect -o idmap=user -o workaround=all <remote user>@<remote domain>.com: /mnt/remote_server As root, I can run this script on the command line without issue, and without being asked for a password the share mounts successfully. Yet, when run by Cron the script fails. The path to sshfs is identical to the value of which sshfs Here is the email root receives from the Cron Daemon: X-Cron-Env: <SHELL=/bin/sh> X-Cron-Env: <HOME=/root> X-Cron-Env: <PATH=/usr/bin:/bin> X-Cron-Env: <LOGNAME=root> X-Cron-Env: <USER=root> Mounting Share fuse: failed to exec mount program: No such file or directory fuse: failed to mount file system: No such file or directory I'm stumped as to why I'm receiving No such file or directory in this instance. It further seems odd given that the paths appear to be correct. I've also attempted to compare the output of env on the shell with env inserted into the script. I don't see any environment variables that should cause this trouble. At bootup, FUSE reports its version as: fuse4bsd: version 0.3.9-pre1, FUSE ABI 7.8 Help me ServerFault wizards, you're my only hope!

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• Changing the prompt in telnet

  - by wim

  With some help from people on here, I was able to set a custom prompt in an ssh session (thanks!). Now I need to do the same in telnet, but I'm not sure of what syntax I could use for that. Basically the telnet prompt is just a > character, I need to modify it to something I can more reliably detect in automation jobs. Hope this makes sense. From inside telnet, trying to escape that command with a bang like !PS1=spam and !PS2=eggs did not change it. wim@wim-acer:~$ ssh [email protected] -i ~/.ssh/guest_nopassphrase -t "export PS1='Sending a custom prompt \w \$ '; exec sh" Sending a custom prompt ~ $ set HOME='/var/tmp' IFS=' ' LOGNAME='guest' PATH='/sbin:/usr/sbin:/bin:/usr/bin' PPID='1128' PS1='Sending a custom prompt \w $ ' PS2='> ' PS4='+ ' PWD='' SHELL='/bin/sh' TERM='xterm' USER='guest' Sending a custom prompt ~ $ telnet localhost <snip> Entering character mode Escape character is '^]'. > !set CONSOLE='/dev/ttyp0' HOME='/var/tmp' IFS=' ' LOGNAME='root' PATH='/sbin:/bin:/usr/sbin:/usr/bin' PPID='546' PREVLEVEL='N' PS1='\w \$ ' PS2='> ' PS4='+ ' PWD='/var/tmp' RESPAWN_COUNT='1' RESPAWN_LAST='0' RESPAWN_MAX='5' RESPAWN_TIME='5' ROOTDEV='/dev/sla1' RUNLEVEL='5' SHELL='/bin/false' TERM='linux' USER='root' > > Connection closed by foreign host Sending a custom prompt ~ $ Connection to 192.168.1.124 closed. wim@wim-acer:~$

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• redirecting output from telnet / nc to file in script fails when cron'd

  - by qhartman

  So, I have device on my network which sits there listening on a port for a connection, and when a connection is made it dumps ascii data out. I need to capture that data to a file. I wrote a dead simple shell script that does this: #!/bin/bash #Config Variables. Age is in Days. DATA_ROOT=/root/data FILENAME=data_`date +%F`.dat HOST=device COMPRESS_AGE=3 #Sanity Checks if [ ! -e $DATA_ROOT ] then echo "The directory $DATA_ROOT seems to not exist. Please create it." exit 1 fi if [ -e $DATA_ROOT/$FILENAME ] then echo "You seem to have extracted data already today. Aborting" exit 1 fi #Get Data nc $HOST 2202 > $DATA_ROOT/$FILENAME #Compress old Data find $DATA_ROOT -type f -mtime +$COMPRESS_AGE -exec gzip {} \; exit 0 It works great when I run it by hand, but when I run it from cron, it doesn't capture any of the output. If I replace nc with telnet I see the initial telnet headers about escape sequences and whatnot, but not the data. Ideas? I've tried forcing bash to act like an interactive shell with -i. I've tried redirecting both stderr and stdout. I know it's got to be some silly simple thing, but I'm utterly failing. This is driving me nuts... EDIT I also just noticed that the nc processes from all my previous attempts at this have been siting sleeping, and when I killed them, cron sent me a bunch of non-sensical error messages. At least now I have something to dig into!

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• BackupExec 12 + RALUS - VERY slow backups

  - by LVDave

  We use Backup Exec 12 and the Remote Agent for Linux/Unix Servers (RALUS) to backup a large RHEL5 system. For various reasons we need to do a daily working set job. These working-set jobs run abysmally slow. The link between the target machine and the BE server is gigabit, and any other type of job runs 1-3GB/min. These working-set jobs start out at perhaps 40MB/min and over the course of the backup job slowly drops down so low that the BE job rate display in the "current jobs" goes blank.. Since we usually are only doing changed-files for one day, the job is usually small and finishes overnight and we don't worry abotu the slowness, but we had some issues with the backup server, and missed about 6 days of fairly heavy work on the Linux box, so this working-set job will be a doozy.. We have support with Symantec, and I've pestered them a lot about this, they've had me run RALUS in debug mode, sent them that log and a VXgather from the BE host and they had no fix/workaround.. To give an idea, I have the mentioned working-set job running for the last 3 1/2 hours and it's backed up just under 10MEGAbytes.... I'm posting this here to see if anybody in the "real world" has seen this/and/or has any ideas what might be causing these abysmally slow jobs, since Symantec seems to be clueless...

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• Run Python script at startup using upstart

  - by MarcusMaximus

  I'm trying to create an upstart script to run a python script on startup. In theory it looks simple enough but I just can't seem to get it to work. I'm using a skeleton script I found here and altered. description "Used to start python script as a service" author "Me <[email protected]>" # Stanzas # # Stanzas control when and how a process is started and stopped # See a list of stanzas here: http://upstart.ubuntu.com/wiki/Stanzas#respawn # When to start the service start on runlevel [2345] # When to stop the service stop on runlevel [016] # Automatically restart process if crashed respawn # Essentially lets upstart know the process will detach itself to the background expect fork # Start the process script exec python /usr/local/scripts/script.py end script The test script I want it to run is currently a simple python script that runs without any issue when run from a terminal. #!/usr/bin/python2 import os, sys, time if __name__ == "__main__": for i in range (10000): message = "UpstartTest " , i , time.asctime() , " - Username: " , os.getenv("USERNAME") #print message time.sleep(60) out = open("/var/log/scripts/scriptlogfile", "a") print >> out, message out.close() The location/var/log/scripts has permissions 777 The file /usr/local/scripts/script.py has permissions 775 The upstart script /etc/init.d/pythonupstart.conf has permissions 755

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• Reverse SSH tunnel: how can I send my port number to the server?

  - by Tom

  I have two machines, Client and Server. Client (who is behind a corporate firewall) opens a reverse SSH tunnel to Server, which has a publicly-accessible IP address, using this command: ssh -nNT -R0:localhost:2222 [email protected] In OpenSSH 5.3+, the 0 occurring just after the -R means "pick an available port" rather than explicitly calling for one. The reason I'm doing this is because I don't want to pick a port that's already in use. In truth, there are actually many Clients out there that need to set up similar tunnels. The problem at this point is that the server does not know which Client is which. If we want to connect back to one of these Clients (via localhost) then how do we know which port refers to which client? I'm aware that ssh reports the port number to the command line when used in the above manner. However, I'd also like to use autossh to keep the sessions alive. autossh runs its child process via fork/exec, presumably, so that the output of the actual ssh command is lost in the ether. Furthermore, I can't think of any other way to get the remote port from Client. Thus, I'm wondering if there is a way to determine this port on Server. One idea I have is to somehow use /etc/sshrc, which is supposedly a script that runs for every connection. However, I don't know how one would get the pertinent information here (perhaps the PID of the particular sshd process handling that connection?) I'd love some pointers. Thanks!

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• SSH hangs when executing command remotely

  - by Serty Oan

  Client : OpenSSH_5.1p1 Debian-5ubuntu1 (Ubuntu 9.04) Server : OpenSSH_5.1p1 Debian-5 (Proxmox 2.6.24-7-pve) I use SSH to execute commands remotely on the server (module check_by_ssh of Nagios). But SSH hangs from time to time when trying to execute commands. I can log to the server via SSH but not executing a simple 'ls'. And it seems to block from all clients from the same IP address. Authentication is not the problem, may it be made by SSH keys or password. ssh -l root -p 2222 server.domain.tld 'ls' Here the client debug info debug1: Entering interactive session. debug2: callback start debug2: client_session2_setup: id 0 debug1: Sending environment. debug3: Ignored env ORBIT_SOCKETDIR *** skipping approx 40 env var ignored debug1: Sending command: ls debug2: channel 0: request exec confirm 1 It hangs there. Then after a random time, it works again (without doing anything). Killing all sshd process on the server seems to work too. It works from a Putty. I saw that some people had trouble like this due to ISP reverse DNS problem, but it does not seem to be the case here. It can work for hours and then not work for half an hour or so. What could explain this behaviour ?

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• upstart scripts: run a task after networking goes up

  - by The Journeyman geek

  I'm working on moving my current server setup to newer hardware, and migrating from ubuntu karmic koala to lucid lynx. Currently i'm using gw6c (compiled from the gogo6 website, as opposed to the version from the repositories) to get ipv6 access for my systems. On the karmic koala system, i used simple init.d script to get the ipv6 client started #! /bin/sh /usr/local/gw6c/bin/gw6c -f /usr/local/gw6c/bin/gw6c.conf I figured since this runs at any runlevel, it should translate to respawn console none start on startup stop on shutdown script exec /usr/local/gw6c/bin/gw6c -f /usr/local/gw6c/bin/gw6c.conf emit free6_ipv6_started end script this works fine started from initctrl, but it apparently fails to start when it boots. - its status being stop/waiting. It works fine (and respawns) when started otherwise.Any ideas on where i'm going wrong, and what would be the appropriate 'start on' arguement? EDIT: the exact error is 'init: gw6c main process (xxx) ended with status 8' followed by the process respawning , with xxx being a PID i suspect. I'm also half suspecting this is cause gw6c starts before networking does, and i need my eth0 up before gw6c is

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• SBS 2008 Sharepoint Database good Memory Limit.

  - by ldelgado

  I manage a small network running on Small Business Server 2008. Lately, the Sharepoint embedded database is getting out of control with its memory usage. I've got a total of 16 GB of RAM on this server, and the Sharepoint database sometimes uses almost 8 GB of RAM. This never happened before, and it started happening after I installed Backup Exec 2010. It happens after a backup is performed. So I suspect there is a memory leak involved. I am working on that issue, but this question isn't about that. I would like to limit the amount of memory the Embedded database uses. I know how to do it. My question is, what would be the ideal amount of memory that I can allocate to Sharepoint? There are only 4 users on my network. One of the users uses two computers but not at the same time. They use sharepoint for a company calendar, and sometimes they share files that way also. Let me know if you need to know anything else. Thanks,

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• Quick introduction to Linux needed

  - by 0xDEAD BEEF

  Hi guys! I have to get into Linux ASAP and realy mean ASAP. I have installed Cygwin but as allways - things dont go as easy as one would like. First problem i enconter was - i choose KDE package, but there is no sign of KDE files anywhere in cygwin folder. How do i run KDE windows. Currently startx fires, but all looks ugly! My desire is to download and run Qt Creator. Seems that there is no cygwin package, but downloading source and compiling is good to go. Only that i have forgoten every linux command i ever knew! :D Please - what are default commands u use on linux? What does exec do? what ./ stands for? What is directory strucutre and why there is such mess in bin folder? Thanks god - i have windows over cygwin, so downloading files is not a problem, but again -how do i unpack them in linux style and how to i build? simply issue "make" command from folder, where i extracted files? Please help!

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• SSH & SFTP: Should I assign one port to each user to facilitate bandwidth monitoring?

  - by BertS

  There is no easy way to track real-time per-user bandwidth usage for SSH and SFTP. I think assigning one port to each user may help. Idea of implementation Use case Bob, with UID 1001, shall connect on port 31001. Alice, with UID 1002, shall connect on port 31002. John, with UID 1003, shall connect on port 31003. (I do not want to lauch several sshd instances as proposed in question 247291.) 1. Setup for SFTP: In /etc/ssh/sshd_config: Port 31001 Port 31002 Port 31003 Subsystem sftp /usr/bin/sftp-wrapper.sh The file sftp-wrapper.sh starts the sftp server only if the port is the correct one: #!/bin/sh mandatory_port=3`id -u` current_port=`echo $SSH_CONNECTION | awk '{print $4}'` if [ $mandatory_port -eq $current_port ] then exec /usr/lib/openssh/sftp-server fi 2. Additional setup for SSH: A few lines in /etc/profile prevents the user from connecting on the wrong port: if [ -n "$SSH_CONNECTION" ] then mandatory_port=3`id -u` current_port=`echo $SSH_CONNECTION | awk '{print $4}'` if [ $mandatory_port -ne $current_port ] then echo "Please connect on port $mandatory_port." exit 1 fi fi Benefits Now it should be easy to monitor per-user bandwidth usage. A Rrdtool-based application could produce charts like this: I know this won't be a perfect calculation of the bandwidth usage: for example, if somebody launches a bruteforce attack on port 31001, there will be a lot of traffic on this port although not from Bob. But this is not a problem to me: I do not need an exact computation of per-user bandwidth usage, but an indicator that is approximately correct in standard situations. Questions Is the idea of assigning one port for each user is a good one? Is the proposed setup an reliable one? If I have to open dozens of ports for many users, should I expect a performance drawback? Do you know a rrdtool-based application which could make the chart above?

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• Designing a persistent asynchronous TCP protocol

  - by dogglebones

  I have got a collection of web sites that need to send time-sensitive messages to host machines all over my metro area, each on its own generally dynamic IP. Until now, I have been doing this the way of the script kiddie: Each host machine runs an (s)FTP server, or an HTTP(s) server, and correspondingly has a certain port opened up by its gateway. Each host machine runs a program that watches a certain folder and automatically opens or prints or exec()s when a new file of a given extension shows up. Dynamic IP addresses are accommodated using a dynamic DNS service. Each web site does cURL or fsockopen or whatever and communicates directly with its recipient as-needed. This approach has been suprisingly reliable, however obvious issues have come up and the situation needs to be addressed. As stated, these messages are time-sensitive and failures need to be detected within minutes of submission by end-users. What I'm doing is building a messaging protocol. It will run on a machine and connection in my control. As far as the service is concerned, there is no distinction between web site and host machine -- there is only one device sending a message to another device. So that's where I'm at right now. I've got a skeleton server and a skeleton client. They can negotiate high-quality authentication and encryption. The (TCP) connection is persistent and asynchronous, and can handle delimited (i.e., read until \r\n or whatever) as well as length-prefixed (i.e., read exactly n bytes) messages. Unless somebody gives me a better idea, I think I'll handle messages as byte arrays. So I'm looking for suggestions on how to model the protocol itself -- at the application level. I'll mostly be transferring XML and DLM type files, as well as control messages for things like "handshake" and "is so-and-so online?" and so forth. Is there anything really stupid in my train of thought? Or anything I should read about before I get started? Stuff like that -- please and thanks.

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