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• Postmaster uses excessive CPU and Disk Writes

  - by wolfcastle

  using PostgreSQL 9.1.2 I'm seeing excessive CPU usage and large amounts of writes to disk from postmaster tasks. This happens even while my application is doing almost nothing (10s of inserts per MINUTE). There are a reasonable number of connections open however. I've been trying to determine what in my application is causing this. I'm pretty newb with postgresql, and haven't gotten anywhere so far. I've turned on some logging options in my config file, and looked at connections in the pg_stat_activity table, but they are all idle. Yet each connection consumes ~ 50% CPU, and is writing ~15M/s to disk (reading nothing). I'm basically using the stock postgresql.conf with very little tweaks. I'd appreciate any advice or pointers on what I can do to track this down. Here is a sample of what top/iotop is showing me: Cpu(s): 18.9%us, 14.4%sy, 0.0%ni, 53.4%id, 11.8%wa, 0.0%hi, 1.5%si, 0.0%st Mem: 32865916k total, 7263720k used, 25602196k free, 575608k buffers Swap: 16777208k total, 0k used, 16777208k free, 4464212k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 17057 postgres 20 0 236m 33m 13m R 45.0 0.1 73:48.78 postmaster 17188 postgres 20 0 219m 15m 11m R 42.3 0.0 61:45.57 postmaster 17963 postgres 20 0 219m 16m 11m R 42.3 0.1 27:15.01 postmaster 17084 postgres 20 0 219m 15m 11m S 41.7 0.0 63:13.64 postmaster 17964 postgres 20 0 219m 17m 12m R 41.7 0.1 27:23.28 postmaster 18688 postgres 20 0 219m 15m 11m R 41.3 0.0 63:46.81 postmaster 17088 postgres 20 0 226m 24m 12m R 41.0 0.1 64:39.63 postmaster 24767 postgres 20 0 219m 17m 12m R 41.0 0.1 24:39.24 postmaster 18660 postgres 20 0 219m 14m 9.9m S 40.7 0.0 60:51.52 postmaster 18664 postgres 20 0 218m 15m 11m S 40.7 0.0 61:39.61 postmaster 17962 postgres 20 0 222m 19m 11m S 40.3 0.1 11:48.79 postmaster 18671 postgres 20 0 219m 14m 9m S 39.4 0.0 60:53.21 postmaster 26168 postgres 20 0 219m 15m 10m S 38.4 0.0 59:04.55 postmaster Total DISK READ: 0.00 B/s | Total DISK WRITE: 195.97 M/s TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND 17962 be/4 postgres 0.00 B/s 14.83 M/s 0.00 % 0.25 % postgres: aggw aggw [local] idle 17084 be/4 postgres 0.00 B/s 15.53 M/s 0.00 % 0.24 % postgres: aggw aggw [local] idle 17963 be/4 postgres 0.00 B/s 15.00 M/s 0.00 % 0.24 % postgres: aggw aggw [local] idle 17188 be/4 postgres 0.00 B/s 14.80 M/s 0.00 % 0.24 % postgres: aggw aggw [local] idle 17964 be/4 postgres 0.00 B/s 15.50 M/s 0.00 % 0.24 % postgres: aggw aggw [local] idle 18664 be/4 postgres 0.00 B/s 15.13 M/s 0.00 % 0.23 % postgres: aggw aggw [local] idle 17088 be/4 postgres 0.00 B/s 14.71 M/s 0.00 % 0.13 % postgres: aggw aggw [local] idle 18688 be/4 postgres 0.00 B/s 14.72 M/s 0.00 % 0.00 % postgres: aggw aggw [local] idle 24767 be/4 postgres 0.00 B/s 14.93 M/s 0.00 % 0.00 % postgres: aggw aggw [local] idle 18671 be/4 postgres 0.00 B/s 16.14 M/s 0.00 % 0.00 % postgres: aggw aggw [local] idle 17057 be/4 postgres 0.00 B/s 13.58 M/s 0.00 % 0.00 % postgres: aggw aggw [local] idle 26168 be/4 postgres 0.00 B/s 15.50 M/s 0.00 % 0.00 % postgres: aggw aggw [local] idle 18660 be/4 postgres 0.00 B/s 15.85 M/s 0.00 % 0.00 % postgres: aggw aggw [local] idle

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• Transient network dropout for Xen DomU's

  - by Stephen C

  We've got a CentOS server running a cluster of virtuals. Occasionally the cluster's internal network drops out for a minute or so ... and then comes back. The problem is somehow related to the actual network traffic, but it is not a simple load issue. (The system is generally lightly loaded, and the problem occurs irrespective of actual load.) The setup: CentOS 5.6 on Dom0, various CentOS on the DomU's Hardware - a Dell R710 with a BroadCom NextXpress 2 NIC (sigh) using the latest drivers for the NIC from BroadCom Xen configured to use network-bridge and vif-bridge Some iptable tweaks to route an unrelated port to one of the virtuals. The system has one externally visible IP address, and Dom0 runs an Apache httpd configured with a number of virtual hosts each of which reverse proxies to web servers running on the virtuals. (The virtuals have to be NAT'ed, primarily because we don't have enough allocated public IP addresses.) The symptoms: Works fine most of the time. When someone tries to UPLOAD a large file to one virtuals, the internal network drops out ... for all virtuals: The Dom0 httpd sees a network timeout talking to the backend server on the virtual and reports a 502. A previously established ssh connection from Dom0 to any of the DomU's freezes. Our monitoring shows ping failures for traffic between virtuals. The Xen consoles to the DomU's do not freeze. No log messages in any log files that I can see, on either Dom0 or the DomU's ... apart from the Dom0 httpd logs. After a minute or so, the problem clears by itself. This is 100% reproducible. What we've tried: Downloading, building and installing the latest BNX2 driver on Dom0 Turning off MSI on the NIC - adding "options bnx2 disable_msi=1" to /etc/modprobe.conf Turning off tcp segmentation offload - "ethtool -K eth0 tso off". Sacrificing a black rooster at midnight. I've exhausted all my options apart from switching to KVM ... or slaughtering more roosters. Any suggestions?

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• Outlook 2011 Contact Import from CSV with Notes containing new lines / cr / lf

  - by Paul Hargreaves

  I'm trying to import several thousand contacts into Outlook 2011 for Mac. Everything is working well except the Notes field as I cannot figure out how to get new lines / carriage returns into it. There is no documentation for the exact format that Outlook supports. After searching the web and experimenting I have tried: Creating a single contact in Outlook with Notes containing several lines of text. I then export the contact to a csv, deleting the contact in Outlook, then re-import. All lines in Notes merge together :-/ Following tips I found such as containing new lines around quotes. e.g. http://creativyst.com/Doc/Articles/CSV/CSV01.htm (search for line-break) Switching the CSV format from DOS to Unix, experimenting using manually injected ctrl-characters such as ^M etc. I would include an example export/import but unfortunately the the new breaks included do not work well in a SU code block.

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• Why did my RWA Computers gadget stop working?

  - by payling

  Our company has SBS 2011 and the "Computers" gadget in Remote Web Access has suddenly stopped working. The below error appears in place of the list of computers: "There was a problem loading a gadget. Contact the person who manages your server." There hasn't been any recent changes to the server that I know of. Also, when I go to SBS standard console and go to properties of a user to view the list of computers the user has access to it says "querying..." instead of a list of computers. Any troubleshooting tips? Can't seem to figure out what is going on. I've tried restarting the server and poking around in the event logs and I couldn't find anything wrong. Update 1: I came across another error when viewing properties for a user through the SBS standard console. "There is no such object on the server."

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• DB2 insert performance - How to measure

  - by svrist

  [From stackoverflow] Im trying to find a way to speedup my inserts to a DB2 9.7.1 (ubuntu linux) Im watching vmstat and trying to gather some statistics via the db2 get snapshot commands but im not able to figure out which numbers im looking for to be able to see where the trouble is. I've read lits of stuff like http://www.eggheadcafe.com/software/aspnet/35692526/question-multiple-row-in.aspx, and http://www.ibm.com/developerworks/data/library/tips/dm-0403wilkins/ and tricks like ALTER TABLE lalala APPEND ON works somewhat (the difference between a dd if=/dev/zero and insert is still a factor 10) but I would like to be able to find the counters or other performance indicators that actually show why it makes sense to use those tricks. For example: What is the metric called that shows me that it is buffer pages allocation (FSCR stuff) that is the problem Where do I see that the insert time is hampered by clustered indexes? I find db2top very useful but im still searching for more direct view of "this is your bottleneck" methods

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• 401 - Unauthorized On Server 2008 R2 IIS 7.5

  - by mxmissile

  I have a web application deployed to Server 2008 IIS 7.5 box. From remote it gives this error: 401 - Unauthorized: Access is denied due to invalid credentials. (remote = desktops on the same LAN) Have tried several remote clients using different browsers, all the same result. (IE, FF, and Chrome) Hitting the application from the desktop of the server itself works flawlessly. The application is using Anonymous Authentication. The application is written in .NET 4.0 Asp.Net using the MVC framework. Sysinternals procmon returns these 2 results for each request: FAST IO DISALLOWED and PATH NOT FOUND. I have 2 other MVC apps running fine on the same server. I have checked the security on the folders and they all match. App runs fine on a Server 2008 IIS 7.0 box. Nothing shows up in the Event log on the server related to this. Pulling my hair out here, any troubleshooting tips?

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• Server with IIS and Apache - how to SSL encrypt Apache with IIS

  - by GAThrawn

  I have a Windows Server 2003 box already setup and working with IIS 6. IIS is set to serve a site out over both HTTP and HTTPS connections using default ports. For various reasons I need to set Apache up on the same server and it needs to serve its pages to end-users as SSL encrypted HTTPS pages. Neither IIS or Apache are (or are ever likely to be) particularly high traffic or high usage. The way I see it there are two possible ways this could be done. Either export the SSL cert from IIS,set it up in Apache and get Apache to server the HTTPS connections itself over a non-default port. Or use IIS to proxy Apache in some way over it's existing SSL security. What is going to end up easiest to setup, configure, maintain and run? Which is going to work best? Has anyone done this sort of thing before? Any tips or things to look out for?

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• OSX Snow Leopard hangs after login

  - by sleepyjames

  After restoring from backup following filesystem corruption my user account hangs after login (After entering my password the login window disappears and all I get is the background and a mouse pointer, no spinning wheel of death etc ..) I can login as a different user and then logout and login as my main account (sometimes!) but this is not consistant. I can login with safemode ok and have tried deleting /System/Caches, ~/Library/Caches and removing all my ~/Library/Preferences which worked once but not again. Does anyone have an any idea which logs I can look in, if any, to see whats happening after login or any other tips? I'm using 10.6.2. Cheers.

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• Migrate SBS 2008 with Exchange 2007 to new hardware

  - by MikeT505

  Hello, We have run out of hard disk space on our existing Small Business Server 2008 and simply wish to upgrade both of the hard drives (currently raid 1) - without too much hassle. My main concern is how to copy across the embedded version of Microsoft Exchange 2007. Is there a simple way to copy all the data across and upgrade? Or is it best to backup and do a clean install? - The difficulty is that it's the same server, so we can't replicate mailboxes for exchange. Any hints or tips welcomed!?

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• vpnc Not Adding Internal DNS Servers to resolv.conf

  - by AJ

  I'm trying to setup vpnc on Ubuntu. When I run vpnc, my resolv.conf file does not get changed. It still only contains my ISP's name servers: #@VPNC_GENERATED@ -- this file is generated by vpnc # and will be overwritten by vpnc # as long as the above mark is intact nameserver 65.32.5.111 nameserver 65.32.5.112 Here is my /etc/network/interfaces: auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 192.168.1.3 netmask 255.255.255.0 gateway 192.168.1.1 dns-nameservers 65.32.5.111 65.32.5.112 Any tips on how to troubleshoot/resolve this? Thanks in advance.

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• Email deliverability -- Whitelist solution or Email delivery service?

  - by JoefrshnJoeclean

  Hey Folks -- our company is encountering the same recurring problem - email deliverability. A lot of our emails are still getting trapped in yahoo and gmail spam filters. We followed yahoo's best practices guide as well as tips Ive found on serverfault. (setting up DKIM, SPF) And even took the Email Server Test (http://www.allaboutspam.com/email-server-test/) Now my question is: has anyone had success using whitelist solutions like goodmail or EmailReach? Alternatively, Im beginning to think that going with a email delivery service like Mailchimp will save me the headache and future stress of managing our email lists. So whitelist solution or just fork up the money and send via an email delivery service? Thanks!

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• Setting the viminfo path in gVim for portability (Windows)

  - by Will Vousden

  I'm trying to make my gVim installation as portable as possible, and in doing so I want to put the _viminfo file in the $VIM directory rather than $HOME. I'm pretty new to hacking vimrc configurations, but here's what I've been trying: let viminfopath=$VIM."\\_viminfo" execute "set viminfo='1000,n".escape(viminfopath, ' ') " Some other portability stuff. set nobackup set nowritebackup if has("win32") || has("win64") set directory=$TMP else set directory=~/tmp end This doesn't seem to be working, though; does anyone have any tips? Thanks!

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• touch pad randomly stopped working on ubuntu desktop

  - by Narcolapser

  Question: What steps can I take to make a touchpad that once worked, work again. Info: I'm running ubuntu desktop on my net book. it has been working more or less fine. There have been some minor issues. but nothing to bad. recently I was messing around with burning a mandriva .iso, and suddenly my touch pad just stops working. every now and then it will work for a brief moment after I bring back from sleep mode. The computer says that there is a touch pad and that it is active. any tips?

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• L2TP with PEAP authentication from MacOS/iOS

  - by Jose

  Following the recent security advisory, I'm reconfiguring our VPN servers and having trouble. We're using Windows 2008 R2 server for VPN services, running RRAS and NPS on the same server and configure it to use PEAP-EAP-MSCHAPV2 authentiation for all tunnel type(PPTP, L2TP, IKEv2, SSTP), which previously allowed plain MSCHAPv2. But Apple products, MacOS and iOS cannot connect to VPN after this change. I tried to install root certificate used in PEAP transaction but no change. Does anyone know whether MacOS/iOS supports PEAP-EAP-MSCHAPv2 authentication in PPTP/L2TP? If so any tips to make it work? (I know PEAP-EAP-MSCHAPv2 is supported in WPA/WPA2 enterprise) Regards.

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• Problems with wireless file copy - hangs during copy

  - by Eran Kampf

  I have this problem on my home network where when I try to copy files via wireless connection, at some point the copy fails and the machine doing the copy loses connection to the network. I'm pretty much lost as to figuring out the source for the problem... Some more details that might help: It's not OS related. I have Windows 7 machines and Leopard machines and this occurs on both I'm using a 3com OfficeConnect router Wired transfer works fine Other programs that require heavy wireless traffic work just fine:streaming large HD movies, Xbox Live! ... I'm lost as to how to even begin trying to diagnose the problem so any tips are welcome...

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• How can I make check_nrpe wait for my remote script to finish executing?

  - by Rauffle

  I have a python script that's being used as a plugin for NRPE. This script checks to see if a process if running on a virtual machine by doing an SSH one-liner with a "ps ax | grep process" attached. When executing the script manually, it works as expected and returns a single line of output for NRPE as well as a status based on whether or not the process is running. When I attempt to run the command setup to execute this script (from my Nagios server), I instantly get the output "NRPE: Unable to read output", however when I run the script manually it takes about a second before it returns output. Other commands run just fine, so it would seem like NRPE needs to wait a second or two for output rather than instantly failing, but I've been unable to find any way of accomplishing this; any tips? Thanks PS: The virtual machines are not accessible from anywhere other than the host machine, hence the need for the nrpe plugin to ssh from the host into the VM to check the process.

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• Red 5, First setup "ssl_error_rx_record_too_long" error message

  - by charles horvath

  I am using Windows 7 and I installed Red 5 0.9.1 just recently. After it installed I put 127.0.0.1 as the IP adress and 5080 as http port. After I start the service in windows I try to connect to the localhost in firefox (http://localhost:5080) and get this error An error occurred during a connection to localhost:5080. SSL received a record that exceeded the maximum permissible length. (Error code: ssl_error_rx_record_too_long) I checked my global flash settings and allowed localhost to pass along with the Red 5 folder in C/programfiles/red5. I currently have the up to date versions of JDK and JRE also. Any tips on what might be wrong?

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• Error installing php extension OAuth via pecl

  - by PJ

  I'm trying to install the php extension OAuth in my local environment. php.net suggests it's super easy. You just run pecl install oauth. I tried this, and here is the output in terminal: downloading oauth-1.0.0.tgz ... Starting to download oauth-1.0.0.tgz (42,834 bytes) ............done: 42,834 bytes 6 source files, building running: phpize grep: /usr/include/php/main/php.h: No such file or directory grep: /usr/include/php/Zend/zend_modules.h: No such file or directory grep: /usr/include/php/Zend/zend_extensions.h: No such file or directory Configuring for: PHP Api Version: Zend Module Api No: Zend Extension Api No: Cannot find autoconf. Please check your autoconf installation and the $PHP_AUTOCONF environment variable. Then, rerun this script. ERROR: `phpize' failed Any tips on how to fix the errors and install OAuth succesfully? I'm on Mac OS X 10.6.3 Thanks!

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• Searching for a specific option in a man page

  - by mitch_feaster

  I often find myself man'ing a command just to learn about one specific option. Most of the time I can search to the option just fine, unless it's something like ffmpeg or gcc where I have to step through about 40 matches until I get to the actual description of the option... Sometimes I can get lucky and search for the word "options" to get close and then refine it from there, but it would be nice if I could reliably jump straight to the option in question. It would be cool if there was a tool that could parse out the options and build a database on which you could do searches, but after looking at the groff markup for a few pages I've determined it would only be a best-guess effort due to the lack of meta-information in groff markup... In my ideal world woman mode in emacs would support searching for specific options... :) Any tips for jumping straight to a specific option in a man page?

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• How do I install a CentOS 5.5 in Xenserver?

  - by deweller

  When I try to install CentOS 5.5 in a new VM, I get an error that the installer is unable to retrieve stage2.img. I have verified the URL and I am able to download this file from a web browser. I suspect it is a networking/routing issue, but I can't figure out what is wrong. This is a new install of XenServer 5.6 on a new server. This server is remote, so I don't have physical access to the box - only ssh access. Can anyone give me some tips on what might be wrong here? Do I need to do something special to get a net install to work? For what its worth, I see the same error trying to install Debian Woody using a similar process. Thanks.

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• Tomcat 6 IP restrictions

  - by KB22

  I need to protect a certain folder within a web application of mine from access from outside of an defined IP range. With O'Reilly's Tomcat Tips I figured that: <Context path="/path/to/secret_files" ...> <Valve className="org.apache.catalina.valves.RemoteAddrValve" allow="127.0.0.1" deny=""/> </Context> Is the way to go? I'm not that much into tomcat configuration so I'm dazzled a little as to where to put these restrictions. Do I put this Within my web.xml or is this a thing I need to add to some general tomcat conf file?

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• Windows XP scheduled tasks and defragmenting?

  - by Gathris

  I am trying to set a seduled task to defrag my HDD on a regular basis and following the guide on http://www.microsoft.com/windowsxp/using/setup/learnmore/tips/gehrke1.mspx. It does not work. That process only brings a DOS window which does nothing (well it displays some text about the Microsoft defragging program). I tried using the "%SystemRoot%\system32\dfrg.msc C:" as the command path that is in the start menu but that brings up the program to start a defrag job and doesn't start automatically. What am I missing?

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• Does the Win XP/7 dual boot "missing restore points" problem apply to systems with separate hard disks for each O/S?

  - by Robert Oschler

  I'm in the process of installing Windows 7/64 on a system with Windows XP/32 on it. During my research, I read about a problem that occurs in the dual boot scenario where Windows XP deletes Windows 7's restore points when it accesses the Windows 7 volume: http://support.microsoft.com/kb/926185 I found a workaround but it seems pretty painful since it appears to involve using the registry to make the Windows 7 volume appear invisible or "offline" to Windows XP, making sharing disk data between the two O/S annoying since you have to use something like an external storage device to get it done: http://www.vistax64.com/tutorials/127417-system-restore-points-stop-xp-dual-boot-delete.html I was wondering if this problem only occurs with systems that have both O/S installed on the same physical hard drive (in different partitions)? In my case, I will have each O/S on a completely separate physical hard drive. Any other tips would be appreciated. -- roschler

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• Oracle: FRM-41211 Error Message when starting a Report from Oracle Forms (64 Bit Windows Server)

  - by DB.

  After installing Oracle Forms and Reports 6.0 (Patch 18) on a Windows 2008 64 Bit server we get the following error when we try to start a report from Forms. "FRM-41211 integration error: ssl failure running another product" The problem is reproducable on another server using the same Windows OS. One of the proposed solutions (extending the REPORTS60_PATH) we have already tried but that did not help solving our problem. Another tip has been to shorten the content of the path variable before installing Oracle Forms and Reports. We will try this later on another server. Any other tips or solutions for this error would be very much appreciated.

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• Using watch to run a shell script - but the script goes defunct

  - by PHP-Steven

  So I want to keep an eye on my network connectivity so I can make a report for my ISP. (seems like the modem goes out for about 30-60 seconds about once a day) So I copied this handy little script http://www.cyberciti.biz/tips/simple-linux-and-unix-system-monitoring-with-ping-command-and-scripts.html And an running it with watch -n 15 ./ping-test.sh I have been testing it by pulling the plug on my modem. The first time watch runs the script after the network goes out it runs fine (sends some email) and then goes defunct. Once networking is restored the script "finishes" and then watch runs it again. So I'm getting mail for when the network goes down, but not how long it was down for. If I run the script straight from the command line it runs (emails) and then exits. Any ideas why? How can I get the script to keep running once the network is down?

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