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• Server 2008 RAID5 resynching

  - by benpage

  I built a W2K8 R2 server last weekend, and built a R5 array using Disk Management, 5x 1TB drives. For the next 60 hours the status said 'Resynching (X%)' as it built the array. during this time i did read and write to the drive (slowly) and once the rebuild was complete speeds were quite fast. I was copying over some data from a USB hard drive overnight, and the machine crashed (looking in the error i believe it was the driver for the usb drive) and so the RAID5 went back to resynching, since the machine was not shut down properly. The issue is, it's been about 48 hours since that started and I'm happy to say it will take roughly 60 hours again to resynch, however.. all this time in Disk Management, the status has only said 'Resynching', not 'Resynching (X%)'. The hard drive light is going nuts, and read/writes are slow again, so I'm assuming it is actually resynching. The question is - is that a correct assumption? and why is disk management not telling me what %age it's done? Is this normal behaviour for a not-properly-shut-down r5 array?

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• fedora12, yum not releasing "lock" after performing an action

  - by James.Elsey

  Hello, This problem has been occurring quite frequently recently and I can't seem to find a way of preventing it. Whenever I perform an action with yum such as to install or remove software, it appears to execute successfully but then I'm unable to move onto the next yum command For example, I executed yum remove skype, it appeared to remove ok, but next when I try to yum search skype it appears that yum is still processing, and I have to manually kill that process via kill 1234 (or whatever the PID is) My output is as follows [root@nevada james]# yum remove skype Loaded plugins: presto, refresh-packagekit Setting up Remove Process Resolving Dependencies --> Running transaction check ---> Package skype.i586 0:2.1.0.47-fc10 set to be erased --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Removing: skype i586 2.1.0.47-fc10 installed 24 M Transaction Summary ================================================================================ Remove 1 Package(s) Reinstall 0 Package(s) Downgrade 0 Package(s) Is this ok [y/N]: y Downloading Packages: Running rpm_check_debug Running Transaction Test Finished Transaction Test Transaction Test Succeeded Running Transaction Erasing : skype-2.1.0.47-fc10.i586 1/1 Removed: skype.i586 0:2.1.0.47-fc10 Complete! [root@nevada james]# yum search skype Loaded plugins: presto, refresh-packagekit Existing lock /var/run/yum.pid: another copy is running as pid 3639. Another app is currently holding the yum lock; waiting for it to exit... The other application is: PackageKit Memory : 79 M RSS (372 MB VSZ) Started: Fri Dec 18 08:39:18 2009 - 00:01 ago State : Sleeping, pid: 3639 Kernel version : 2.6.31.6-166.fc12.x86_64 Any ideas how I can prevent this behaviour? Thanks

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• Programmable Home Security Alarm [closed]

  - by stej

  I don't ask for recommendation! (just wanted to say that; anyway it doesn't matter now as the question is closed) I've seen some advertisements about home alarms that notifies me that something is happening in my house. None of them mentioned programmability (with real programming language like e.g C, assembler, whatever). As a programmer I'd like to have a possibility to add some behaviour, that is not part of the alarm itself. This might be: take snapshots of all cameras in a house and send it to some email send email, twitter message, skype message to some predefined account send email to a police (silly, I know) start turning the lights on and off (scary, right?) etc. (would be veeery challenging with assembler, I know; but lets suppose I can use some more high level language) I don't expect that there is a alarm system capable of this stuff, that's why I'm looking for a programmable module. Question: Is it even possible? Is it good idea (my program could crash and cause instability of the system).

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• Postfix: LDAP not working (warning: dict_ldap_lookup: Search base not found: 32: No such object)

  - by Heinzi

  I set up LDAP access with postfix. ldapsearch -D "cn=postfix,ou=users,ou=system,[domain]" -w postfix -b "ou=users,ou=people,[domain]" -s sub "(&(objectclass=inetOrgPerson)(mail=[mailaddr]))" delivers the correct entry. The LDAP config file looks like root@server2:/etc/postfix/ldap# cat mailbox_maps.cf server_host = localhost search_base = ou=users,ou=people,[domain] scope = sub bind = yes bind_dn = cn=postfix,ou=users,ou=system,[domain] bind_pw = postfix query_filter = (&(objectclass=inetOrgPerson)(mail=%s)) result_attribute = uid debug_level = 2 The bind_dn and bind_pw should be the same as I used above with ldapsearch. Nevertheless, calling postmap doesn't work: root@server2:/etc/postfix/ldap# postmap -q [mailaddr] ldap:/etc/postfix/ldap/mailbox_maps.cf postmap: warning: dict_ldap_lookup: /etc/postfix/ldap/mailbox_maps.cf: Search base 'ou=users,ou=people,[domain]' not found: 32: No such object If I change LDAP configuration, so that anonymous users have complete access to LDAP olcAccess: {-1}to * by * read then it works: root@server2:/etc/postfix/ldap# postmap -q [mailaddr] ldap:/etc/postfix/ldap/mailbox_maps.cf [user-id] But when I restrict this access to the postfix user: olcAccess: {-1}to * by dn="cn=postfix,ou=users,ou=system,[domain]" read by * break it doesn't work but produces the error printed above (although ldapsearch works, only postmap doesn't). Why doesn't it work when binding with a postfix DN? I think I set up the LDAP ACL for the postfix user correctly, as the ldapsearch command should prove. What can be the reason for this behaviour?

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• Couldn't upload files to Sharepoint site while passing through Squid Proxy

  - by Ecio

  Hi all, we have this issue: one of our employees is collaborating with a supplier and he needs to upload documents on a Sharepoint site hosted on the supplier's main site. In our environment we use Squid Proxy to allow people navigate on the net (we have NTLM authentication and users transparently authenticate while using IE and FF). It seems that this specific Sharepoint site is using Integrated Windows Authentication only, and according to some research on the net it seems that this can have troubles with proxies. More specifically, we have tried two Squid versions: with Squid 3.0 we are unable to login to the site (the browser loads an empty page) with Squid 2.7 (that supports "Connection Pinning") we are able to login into the site, move on the different sections BUT.. when we try to upload a file that is bigger than a couple of KiloBytes (i.e. 10KB) the browser loads an error page (i think it's a 401 unauthorized but i must verify it) we've tried changing a couple of Squid options (in 2.7), what we got is that when you try to upload the file you got an authentication box (just like the initial login) and it refuses to go on even if you enter the same authentication credentials. What's really strange is that when you try to upload a small file (i.e. a text or binary 1KB file) the upload succeeds. I initially thought that maybe there was something misconfigured on their Sharepoint site but I've tried also this site: www.xsolive.com (it's a sharepoint 2007 demo site) and I've experienced the same problem. Has any of you experienced such behaviour? Thanks! Of course we've suggested to the supplier to activate also Basic+SSL and we're waiting for their reply..

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• 4in6 tunneling (via OpenVPN?)

  - by Deshene

  I have a local network with internet access. But unfortunately IPv4 internet connection speed is limited to 1mbps, which is realy sad. Fortunately I have a native IPv6, and there is no connection speed limit over IPv6. So, in order to get a good internet connection I made a plan: connect to the VPN-service over IPv6, and pass all IPv4 traffic through IPv6 tunnel, or something like that, I think you get the idea. I suggested to use service like HideMyAss.com, but unfortunately they don't support IPv6. The question is: Is there any existing VPN service that will make my dreams come true, and is easy to use, which I could connect over PPTP or OpenVPN (I want to set up connection to VPN in my router settings). Edit: It seems like there are couple of VPN services that supports IPv6 (it's odd, but the biggest VPN services support only IPv4), and there is none providing 4in6 tunnels. So, I came to the following solution: rent a VPS with IPv6 address, and manually setup 4in6 tunnel. I'm not good at networking, never did things like that, and don't know where to start, and what should I do. The use case, as I undestand, should look like this: I connect from my home computer to the VPS via OpenVPN, and after that all my IPv4 traffic pass through IPv6 (server do the job). OpenVPN - because I want to configure VPN connection to server in my router (Asus RT-N16?). How can I achieve this?

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• Toshiba Portege M400 screen rotation not working under Windows 7 x64

  - by Christi

  I have installed Windows 7 on my Toshiba Portege M400. This in itself was relatively tricky.* However, the button utilities aren't quite working for me. One of the buttons tries to launch the Toshiba Assist program, which doesn't appear to be available under Windows 7 for the M400, but this I can live without. More important is that the screen won't rotate as it is supposed to when you hold the "cancel" (X in a circle) button on the bezel. The PC is set to run "C:\Program Files (x860\Toshiba\Toshiba Rotation Utility\phtrot.exe". There is a "trot.exe" file in the same directory (the former appears to be to cause slightly different behaviour when rotation is done by press and hold). Neither of these programs rotates the screen either by using the buttons or from the command line. The screen is rotating normally when switching from tablet to laptop mode, so there does not appear to be an inherent problem with rotation. I'd just like to be able to use the buttons on the side of the screen to change the screen orientation. Windows XP used to have a "setrot" utility to do this, but that seems to have gone in Windows 7 Thanks for your help. *Just in case anyone comes looking for how to do this, you need to extract driver files from http://cdgenp01.csd.toshiba.com/content/support/downloads/util_raid_os2007252a.exe, which does not seem to be listed among the available files for the m400. This executable contains the SATA interface drivers that will need to be loaded by the installer before it can see your hard disk drive. It needs to be unpacked and the files copied to a USB key which they can then be loaded from in the install process. The utilities etc. for installation post windows install are all available from the Toshiba USA support website.

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• How can I solve the apache2 httpd error "mixing * ports and non-* ports with a NameVirtualHost addre

  - by rrc7cz

  Here is the error I get when booting up Apache2: * Starting web server apache2 apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName [Wed Oct 21 16:37:26 2009] [error] VirtualHost *:80 -- mixing * ports and non-* ports with a NameVirtualHost address is not supported, proceeding with undefined results [Wed Oct 21 16:37:26 2009] [error] VirtualHost *:80 -- mixing * ports and non-* ports with a NameVirtualHost address is not supported, proceeding with undefined results [Wed Oct 21 16:37:26 2009] [error] VirtualHost *:80 -- mixing * ports and non-* ports with a NameVirtualHost address is not supported, proceeding with undefined results [Wed Oct 21 16:37:26 2009] [error] VirtualHost *:80 -- mixing * ports and non-* ports with a NameVirtualHost address is not supported, proceeding with undefined results [Wed Oct 21 16:37:26 2009] [warn] NameVirtualHost *:80 has no VirtualHosts I first followed this guide on setting up Apache to host multiple sites: http://www.debian-administration.org/articles/412 I then found a similar question on ServerFault and tried applying the solution, but it didn't help. Here is an example of my final VirtualHost config: <VirtualHost *:80> ServerAdmin [email protected] ServerName www.xxx.com ServerAlias xxx.com # Indexes + Directory Root. DirectoryIndex index.html DocumentRoot /var/www/www.xxx.com # Logfiles ErrorLog /var/www/www.xxx.com/logs/error.log CustomLog /var/www/www.xxx.com/logs/access.log combined </VirtualHost> with the domain X'd out to protect the innocent :-) Also, I have the conf.d/virtual.conf file mentioned in the guide looking like this: NameVirtualHost * The odd thing is that everything appears to work fine for two of the three sites.

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• Server 2008 R2 Dns Lockup

  - by Richard Maynard

  Hi, We've deployed our first 2008 R2 server on a client site which has replaced their existing 2003 DC. This server provides DNS resolution services to all client machines on that site for general internet usage. Since using the 2008 R2 DNS services we have noticed every couple of days the DNS server starts timing out when requests to certain sites are made (google is the only example I can provide at this time although it seems to be larger sites with problems rather than small - CDN compatiblity issue?). When you restart the DNS Server service then resolution returns to normal... just only for a day or so. Is anybody aware of any significant changes to the DNS server architecture or configuration out of the box in R2 that may explain this intermittent behaviour? I have already tried the fix listed here to no avail: http://weblogs.asp.net/owscott/archive/2009/09/15/windows-server-2008-r2-dns-issues.aspx The following PS command prompt info illustrates the issue: PS C:\Users\Administrator.UK> nslookup Default Server: s8209001.uk.kingdomfaith.com Address: 10.1.3.4 > www.google.com Server: s8209001.uk.kingdomfaith.com Address: 10.1.3.4 Non-authoritative answer: Name: www.l.google.com Addresses: 66.102.9.99 66.102.9.104 66.102.9.105 66.102.9.103 66.102.9.147 Aliases: www.google.com > www.google.co.uk Server: s8209001.uk.kingdomfaith.com Address: 10.1.3.4 * s8209001.uk.kingdomfaith.com can't find www.google.co.uk: Server failed Thanks in advance. Regards,

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• nginx subdomains improperly act like wildcard?

  - by binjured

  I have an odd problem with nginx subdomains. First, my configuration: server { listen 443 ssl; server_name secure.example.com; ssl_certificate example.crt; ssl_certificate_key example.key; keepalive_timeout 70; location / { fastcgi_pass 127.0.0.1:8000; ... } } server { listen 80; server_name example.com www.example.com; location / { fastcgi_pass 127.0.0.1:8000; ... } } The idea being that I have a secure domain, secure.example.com and a normal domain, example.com. In practice, I can go to https://example.com and http://secure.example.com. I worked around the second issue with an intermediary server: server { listen 80; server_name secure.example.com; rewrite ^(.*) https://secure.example.com$1 permanent; } But this is not an optimal solution and I'd have to create another one to redirect https on the tld to the subdomain. I feel like I must be doing something wrong if I need multiple servers like that. Why does https://example.com work when there is no server listening on 443 there? Shouldn't it just fail to connect? I'm rather confused.

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• Side-By-Side Configuration Error VC90.CRT

  - by Swiss

  I keep receiving the following error when trying to run MikTeX 2.8 or Visual Studio 2008 on 64-Bit Windows Vista. It's particularly odd because both programs were working problem free until a few days ago. The application has failed to start because its side-by-side configuration is incorrect. Please see the application event log for more detail. Opening the Application log provides the following information: Activation context generation failed for "C:\Program Files (x86)\MiKTeX 2.8\miktex\bin\texworks.exe". Error in manifest or policy file "C:\Program Files (x86)\MiKTeX 2.8\miktex\bin\Microsoft.VC90.CRT.MANIFEST" on line 4. Component identity found in manifest does not match the identity of the component requested. Reference is Microsoft.VC90.CRT,processorArchitecture="x86",publicKeyToken="1fc8b3b9a1e18e3b",type="win32",version="9.0.30729.4148". Definition is Microsoft.VC90.CRT,processorArchitecture="x86",publicKeyToken="1fc8b3b9a1e18e3b",type="win32",version="9.0.30729.1". Please use sxstrace.exe for detailed diagnosis. It looks like the problem is with Microsoft.VC90.CRT.MANIFEST, but I am not sure why or how to fix this problem. I have tried uninstalling/reinstalling Visual Studio and MikTeX, as well as uninstalling/reinstalling Microsoft's C++ Redistributable, but nothing seems to be fixing this problem.

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• Why are my Windows 7 updates continuously failing?

  - by Chris C.

  I'm an advanced level user here with an odd issue. I have two Windows Updates that are failing to install, every single time. I'm getting a mysterious "Code 1" error on both updates, an error for which I'm having difficulty finding a solution. The updates in question are: Security Update for Microsoft Visual C++ 2008 Service Pack 1 Redistributable Package (KB2538243) System Update Readiness Tool for Windows 7 for x64-based Systems (KB947821) [May 2011] Because these updates are failing, the Shut Down button in my start menu always has the shield icon next to it, indicating that "new" updates will be installed on shut down. But, of course, they'll fail and when the PC is restarted, the shield icon is still there. When checking the update history and viewing the details of the failed updates, I get the following: Security Update for Microsoft Visual C++ 2008 Service Pack 1 Redistributable Package (KB2538243) Installation date: ?6/?29/?2011 3:00 AM Installation status: Failed Error details: Code 1 Update type: Important A security issue has been identified leading to MFC application vulnerability in DLL planting due to MFC not specifying the full path to system/localization DLLs. You can protect your computer by installing this update from Microsoft. After you install this item, you may have to restart your computer. More information: http://go.microsoft.com/fwlink/?LinkId=216803 System Update Readiness Tool for Windows 7 for x64-based Systems (KB947821) [May 2011] Installation date: ?6/?28/?2011 3:00 AM Installation status: Failed Error details: Code 1 Update type: Important This tool is being offered because an inconsistency was found in the Windows servicing store which may prevent the successful installation of future updates, service packs, and software. This tool checks your computer for such inconsistencies and tries to resolve issues if found. More information: http://support.microsoft.com/kb/947821 About My System I'm running Windows 7 Home Premium x64 Edition. This is a custom PC build and the OS was installed fresh, not an upgrade from a previous version. I've been running this system for about 4 months. Windows Updates aside, the system is usually quite stable. Thanks in advance for your help!

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• Preseeding Ubuntu partman recipe using LVM and RAID

  - by Swav

  I'm trying to preseed Ubuntu 12.04 server installation and created a recipe that would create RAID 1 on 2 drives and then partition that using LVM. Unfortunately partman complains when creating LVM volumes saying there no partitions in recipe that could be used with LVM (in console it complains about unusable recipe). The layout I'm after is RAID 1 on sdb and sdc (installing from USB stick so it takes sda) and then use LVM to create boot, root and swap. The odd thing is that if I change the mount point of boot_lv to home the recipe works fine (apart from mounting in wrong place), but when mounting at /boot it fails I know I could use separate /boot primary partition, but can anybody tell me why it fails. Recipe and relevant options below. ## Partitioning using RAID d-i partman-auto/disk string /dev/sdb /dev/sdc d-i partman-auto/method string raid d-i partman-lvm/device_remove_lvm boolean true d-i partman-md/device_remove_md boolean true #d-i partman-lvm/confirm boolean true d-i partman-auto-lvm/new_vg_name string main_vg d-i partman-auto/expert_recipe string \ multiraid :: \ 100 512 -1 raid \ $lvmignore{ } \ $primary{ } \ method{ raid } \ . \ 256 512 256 ext3 \ $defaultignore{ } \ $lvmok{ } \ method{ format } \ format{ } \ use_filesystem{ } \ filesystem{ ext3 } \ mountpoint{ /boot } \ lv_name{ boot_lv } \ . \ 2000 5000 -1 ext4 \ $defaultignore{ } \ $lvmok{ } \ method{ format } \ format{ } \ use_filesystem{ } \ filesystem{ ext4 } \ mountpoint{ / } \ lv_name{ root_lv } \ . \ 64 512 300% linux-swap \ $defaultignore{ } \ $lvmok{ } \ method{ swap } \ format{ } \ lv_name{ swap_lv } \ . d-i partman-auto-raid/recipe string \ 1 2 0 lvm - \ /dev/sdb1#/dev/sdc1 \ . d-i mdadm/boot_degraded boolean true #d-i partman-md/confirm boolean true #d-i partman-partitioning/confirm_write_new_label boolean true #d-i partman/choose_partition select Finish partitioning and write changes to disk #d-i partman/confirm boolean true #d-i partman-md/confirm_nooverwrite boolean true #d-i partman/confirm_nooverwrite boolean true EDIT: After a bit of googling I found below snippet of code from partman-auto-lvm, but I still don't understand why would they prevent that setup if it's possible to do manually and booting from boot partition on LVM is possible. # Make sure a boot partition isn't marked as lvmok if echo "$scheme" | grep lvmok | grep -q "[[:space:]]/boot[[:space:]]"; then bail_out unusable_recipe fi

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• Proliant RAID 1 Rebuild Questions

  - by Nicholas

  I have a HP Proliant ML350 G5 server that experienced a power supply failure overnight. The power supply was replaced but unfortunately it got restarted with only 1 disk in the RAID 1 set plugged in. (The raid controller is the build in E200i). The raid BIOS then said on start-up that it had entered Interim Recovery Mode. However I would have expected it to still start up with only the 1 drive. The bios however says that it cannot find a C: drive and enters a reboot loop polling the other boot devices. First question is, is this normal behaviour not to start up on 1 disk? The second drive was then plugged in (all drives are ok) and the raid bios started an automatic rebuild on that disk. This appears to be a background process as there is no progress shown. However based on the light flashing it looks like it is working. My second question is how long will this rebuild take? (36GB 15K SAS drive). I cannot see any error messages and it looks like it is rebuilding the drive ok, but the computer still will not start-up. It still says during the boot up process that the C: drive is not found. If I wait for the rebuild to finish, is it likely to fix itself and find the C: drive? Or is there some other problem here?

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• What is Apache Synapse?

  - by Aren B

  My website keeps getting hit by odd requests with the following user-agent string: Mozilla/4.0 (compatible; Synapse) Using our friendly tool Google I was able to determine this is the hallmark calling-card of our friendly neighborhood Apache Synapse. A 'Lightweight ESB (Enterprise Service Bus)'. Now, based on this information I was able to gather, I still have no clue what this tool is used for. All I can tell is that is has something to do with Web-Services, and supports a variety of protocols. The Info page only leads me to conclude it has something to do with proxies, and web-services. The problem I've run into is that while normally I wouldn't care, we're getting hit quite a bit by Russian IPs (not that russian's are bad, but our site is pretty regionally specific), and when they do they're shoving wierd (not xss/malicious at least not yet) values into our query string parameters. Things like &PageNum=-1 or &Brand=25/5/2010 9:04:52 PM. Before I go ahead and block these ips/useragent from our site, I'd like some help understanding just what is going on. Any help would be greatly appreciated :)

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• mdadm cron job sends email that cron has run

  - by Andrew

  I've got an Ubuntu 8.04 server using mdadm to create several RAID1 arrays. I created /etc/cron.hourly/mdadm as follows: #! /bin/sh set -e mdadm --monitor /dev/md0 /dev/md3 /dev/md4 --oneshot (Yes, the array numbers are not sequential, and I'm not using --scan beacuse I have a degraded array that may or may not have been used as swap and I can't delete, but I think that's a separate issue. If it's the underlying cause of this, I need to fix it.) mdadm sends me email (configured in the /etc/mdadm/mdadm.conf) on DegradedArray etc. events. This is the desired behaviour. What is not desired, and I can't work out, is why cron is sending me (relatively pointless) emails, via an alias in /etc/aliases: From: root@<hostname> (Cron Daemon) To: root@<hostname> Subject: Cron <root@<hostname>> cd / && run-parts --report /etc/cron.hourly Content-Type: text/plain; charset=ANSI_X3.4-1968 X-Cron-Env: <SHELL=/bin/sh> X-Cron-Env: <PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin> X-Cron-Env: <HOME=/root> X-Cron-Env: <LOGNAME=root> Message-Id: <id@hostname> Date: Fri, 7 May 2010 13:17:01 +0930 (CST) /etc/cron.hourly/mdadm: mdadm: Monitor using email address "<root_alias@domain>" from config file I've got a dozen other servers behaving correctly (mdadm sends email, cron doesnt') with identical /etc/crontab files: # /etc/crontab: system-wide crontab # <snip comments> SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin # m h dom mon dow user command 17 * * * * root cd / && run-parts --report /etc/cron.hourly <snip anacron jobs> Should I simply remove the --report, or is there something else in my cron config somewhere causing this?

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• Asus WL-520GU conflicting subnet (and/or IP) with 2Wire DSL

  - by Paula

  I have an Asus wireless router: WL-520GU... and an AT&T 2Wire for my DSL connection. When I try to browse anywhere, I just get an odd message from the Asus router (in the common Asus broken-English, bad formatting, and awful spelling): http://postimage.org/image/upxrjflcj I guess it's trying to say: Your Asus Router and your 2Wire have the same subnet mask. (It doesn't say if that's good, or bad... but it sounds like they must be different.) but... But for the "solution" it looks like it's trying to say: Your Asus Router and your 2Wire have the same IP address. My Asus has the defaults: 192.168.1.1 and 255.255.255.0 My 2Wire has: 192.168.1.66 I'm not seeing where the conflict(s) could be. The Asus firmware is v3.0.0.14 . None of these problems occur with the old v3.0.0.8 firmware. Any ideas on how to fix this? (PLEASE don't say to run a totally different DD/Tomato firmware because it's "better". I need to fix THIS 1 problem, not try to convince my company to switch everything to an entirely different set of problems.)

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• What can cause an increase in inactive memory and how to reclaim it?

  - by Boaz

  I have heavy application running on a CentOS server and I'm seeing a strange memory behavior. Here is a snapshot of a munin graph: As you can see the amount of committed memory increases gradually causing the swap file to be use. What strikes me odd is that the amount of inactive memory keeps growing as well. It is my understanding that the inactive memory is actually memory freed up but not yet clean by the OS and put back in the free memory pool. It seems that running out of memory is acutally caused by this lack of clean up, but I may be wrong. Can you give some tips to find the cause of the problem and/or cause CentOS to reclaim the inactive memory? Thanks. Some extra info: 1) I have a tmpfs mounted on /tmp and the number of files stored there grows (but it is double the amount of the inactive memory). 2) cat /proc/meminfo (at a later stage than the image) gives: MemTotal: 14371428 kB MemFree: 1207108 kB Buffers: 35440 kB Cached: 4276628 kB SwapCached: 785316 kB Active: 9038924 kB Inactive: 3902876 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 14371428 kB LowFree: 1207108 kB SwapTotal: 10223608 kB SwapFree: 6438320 kB Dirty: 627792 kB Writeback: 0 kB AnonPages: 7844560 kB Mapped: 49304 kB Slab: 146676 kB PageTables: 27480 kB NFS_Unstable: 0 kB Bounce: 0 kB CommitLimit: 17409320 kB Committed_AS: 16471488 kB VmallocTotal: 34359738367 kB VmallocUsed: 275852 kB VmallocChunk: 34359462007 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 Hugepagesize: 2048 kB 3) The application is a combination of MySQL, Heritrix (http://crawler.archive.org/ ) and a Tomcat based Java servlet to manage things.

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• Apache reaching MaxClients and locking the server

  - by Rodrigo Sieiro

  Hi. I currently have an Apache2 server running with mpm-prefork and mod_php on a OpenVZ VPS with 512M real / 1024M burstable RAM (no swap). After running some tests, I found that the maximum process size Apache gets is 23M, so I've set MaxClients to 25 (23M x 25 = 575 MB, ok for me). I decided to run some load tests on my server, and the results left me puzzled. I'm using ab on my desktop machine requesting the main page from a wordpress blog. When I run ab with 24 concurrent connections, everything seems fine. Sure, CPU goes up, free RAM goes down, and the result is about 2-3s response time per request. But if I run ab with 25 concurrent connections (my server limit), Apache just hangs after a couple of seconds. It starts processing the requests, then it stops responding, CPU goes back to 100% idle and ab times out. Apache log says it reached MaxClients. When this happens, Apache keeps itself locked up with 25 running processes (they're all in "W" if I check server status) and only after the TimeOut setting the processes start to die and the server starts responding again (in my case it's set to 45). My question: is that expected behaviour? Why Apache just dies when it reaches MaxClients? If it works with 24 connections, shouldn't it work with 25, just taking maybe more time to respond each request and queueing up the rest? It sounds kinda strange to me that any kid running ab can alone kill a webserver just by setting the concurrent connections to the servers MaxClients.

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• What can cause an increase in inactive memory and how to reclame it?

  - by Boaz

  Hi All, I have heavy application running on a CentOS server and I'm seeing a strange memory behavior. Here is a snapshot of a munin graph: As you can see the amount of committed memory increases gradually causing the swap file to be use. What strikes me odd is that the amount of inactive memory keeps growing as well. It is my understanding that the inactive memory is actually memory freed up but not yet clean by the OS and put back in the free memory pool. It seems that running out of memory is acutally caused by this lack of clean up, but I may be wrong. Can you give some tips to find the cause of the problem and/or cause CentOS to reclaim the inactive memory? Thanks. Some extra info: 1) I have a tmpfs mounted on /tmp and the number of files stored there grows (but it is double the amount of the inactive memory). 2) cat /proc/meminfo (at a later stage than the image) gives: MemTotal: 14371428 kB MemFree: 1207108 kB Buffers: 35440 kB Cached: 4276628 kB SwapCached: 785316 kB Active: 9038924 kB Inactive: 3902876 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 14371428 kB LowFree: 1207108 kB SwapTotal: 10223608 kB SwapFree: 6438320 kB Dirty: 627792 kB Writeback: 0 kB AnonPages: 7844560 kB Mapped: 49304 kB Slab: 146676 kB PageTables: 27480 kB NFS_Unstable: 0 kB Bounce: 0 kB CommitLimit: 17409320 kB Committed_AS: 16471488 kB VmallocTotal: 34359738367 kB VmallocUsed: 275852 kB VmallocChunk: 34359462007 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 Hugepagesize: 2048 kB

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• What can cause an increase in inactive memory and how to reclaim it?

  - by Boaz

  Hi All, I have heavy application running on a CentOS server and I'm seeing a strange memory behavior. Here is a snapshot of a munin graph: As you can see the amount of committed memory increases gradually causing the swap file to be use. What strikes me odd is that the amount of inactive memory keeps growing as well. It is my understanding that the inactive memory is actually memory freed up but not yet clean by the OS and put back in the free memory pool. It seems that running out of memory is acutally caused by this lack of clean up, but I may be wrong. Can you give some tips to find the cause of the problem and/or cause CentOS to reclaim the inactive memory? Thanks. Some extra info: 1) I have a tmpfs mounted on /tmp and the number of files stored there grows (but it is double the amount of the inactive memory). 2) cat /proc/meminfo (at a later stage than the image) gives: MemTotal: 14371428 kB MemFree: 1207108 kB Buffers: 35440 kB Cached: 4276628 kB SwapCached: 785316 kB Active: 9038924 kB Inactive: 3902876 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 14371428 kB LowFree: 1207108 kB SwapTotal: 10223608 kB SwapFree: 6438320 kB Dirty: 627792 kB Writeback: 0 kB AnonPages: 7844560 kB Mapped: 49304 kB Slab: 146676 kB PageTables: 27480 kB NFS_Unstable: 0 kB Bounce: 0 kB CommitLimit: 17409320 kB Committed_AS: 16471488 kB VmallocTotal: 34359738367 kB VmallocUsed: 275852 kB VmallocChunk: 34359462007 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 Hugepagesize: 2048 kB 3) The application is a combination of MySQL, Heritrix (http://crawler.archive.org/ ) and a Tomcat based Java servlet to manage things.

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• Tomcat 6 Windows Server 64 Redirect Connector Fails

  - by Rafe

  So is there some problem with running the Tomcat connectors under a 64 bit windows OS? Here's my configuration: Windows Server 2003 64 bit Intel Xeon Tomcat 6.0.26 JVM 1.6.0 (64bit) ISAPI Redirect Connector 1.2.30.0 (64 bit) Calling the IP address of the site with :8080 brings up the tomcat page so I know that's running and the examples all work so its obviously not having a problem with the JVM. Calling the site ip on port 80 however gives me error 324 - looking at the application log on windows shows "Could not load all ISAPI filters for site/service. Therefore startup aborted". The ISAPI filter page under the web site properties shows the status of this filter to be down with a red arrow. The ISAPI filter name is jakarta and there is a corresponding virtual directory set up in the root of the site pointing to the same directory as the filter. The jakarta web service extension is also pointing to the required dll (c:\program files\apache software foundation\jakarta isapi redirector\bin\isapi_redirect.dll). Incidentally, this same problem occurs when trying to use Tomcat 5.5. I've also tried swapping out various redirect versions. It's really odd because I got it to work once with a version of the redirector that came with Plesk but I've since uninstalled everything to do with plesk and even trying to use the plesk-compiled dll doesn't work now. I am pulling my hair out on this, any ideas?

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• Cisco 837 not passing UDP traffic properly (was: DNS query problem)

  - by TessellatingHeckler

  We have a setup of ADSL line - Cisco 837 ADSL router - Zyxel ZyWall 35 firewall/NAT - Switch - LAN. It has been fine for years, suddenly DNS resolution stopped working from the LAN to public DNS servers. No changes that I know of, so I can't revert anything. Current behaviour: DNS requests from the LAN using TCP show up in the oubound firewall log, in the Cisco debug log, in the dns-server-firewall, in tcpdump on the DNS server, the answer comes back, it works fine. DNS requests from the LAN using UDP show up in the outbound firewall log, in the Cisco debug log, but does NOT show in the dns-server-firewall, not in tcpdump on the DNS server, times out. DNS requests from the Cisco using UDP show up in the dns-server-firewall and in tcpdump on the DNS server, answer received, works fine. netcat connections to port 53 or a random port by TCP show up in the dns-server-firewall netcat connections to port 53 or a random port by UDP do not show up in the dns-server-firewall Summary: TCP seems fine throughought. UDP works from the Cisco over the ADSL, and it works from the LAN to the Cisco, but it doesn't seem to cross the Cisco 837 properly. Update: confirmed with netcat that any UDP traffic from the LAN is affected, not just traffic to port 53. Update: If I change the firewall's external IP to any other IP in the subnet, this starts working. When I put it back, it stops working. I now suspect it's an ISP issue (does that sound plausible?), and am removing the Cisco config.

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• 16-bit MS-DOS Subsystem: csrss.exe

  - by Wesley

  Hi all, I just booted up my Samsung N120 netbook (with Windows XP Home SP3) and a dialog box came up with a command prompt window behind it. The dialog box is titled 16 bit MS-DOS Subsystem and the message is as follows: C:\DOCUME~1\SAMSUNG\csrss.exe The NTVDM CPU has encountered an illegal instruction. CS:0544 IP:0117 OP:63 00 64 00 34 Choose 'Close' to terminate the application. This only started on my most recent boot-up. One thing to note is that when I downloaded the Dropbox installer and opened it up, Panda Cloud Antivirus detected a suspicious file, which was csrss.exe and "neutralized it." However, an actual virus or trojan was not detected immediately before the file was detected and neutralized. Just under two weeks ago, a trojan and two viruses were detected for some odd reason. (I only went to website I knew and I do not torrent or browse adult sites.) Anyhow, the two viruses came up in temporary files and the trojan was "neutralized." Anyways, the main question is: How can I repair the csrss.exe file such that Windows XP starts up properly? A screenshot could be posted upon request. Thanks in advance!

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• Explorer and open file dialog not responding (Vista)

  - by rohancragg

  Any explorer window opened for the first time on my machine causes the explorer window to display the folders tree and folder path in the address bar immediately but the file/folder list pane is blank and the window displays 'Not Responding' in the title bar, this hangs for up to a minute or more. Any file dialog displays 'Not Responding' in the title bar. The files list is eventually displayed after a few seconds or more. Steps to repro: Close all open instances of explorer Windows Key | Run | [enter a folder path such as 'c:\temp'] Or within any app: use a file open / save dialog Once there is at least one open instance of explorer the performance is still fairly poor but not nearly so bad and file lists are displayed in a timely fashion. What I've tried: Cleaned up registry with CCleaner tool, and uninstalled all other unused software Checked nothing unwanted running at startup with Autoruns Removed any ISO burner/recorder/mount software Still to try Get latest version of everything - especially stuff with shell extension behaviour such as TortoiseSVN Anyone have any other suggestions? Thanks alot. Update I'm wondering if this is related, I'll try the hotfix when I get home and report back: KB972685 - FIX:Explorer.exe hangs when using a shell extension written using MFC Update 2 Before I got a chance to try the hotfix it seems one of the above actions fixed this for me; either the removal of IsoRecorder or TortoiseHg (which I was no longer using anyway). Update 3 A similar issue with Explorer.exe has come back since installing TortoiseHg 1.01 :-(

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