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Articles indexed Friday June 8 2012

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• Clients didn't switch to secondary DNS server during fail over

  - by The Digital Ninja

  I have two internal dns servers set up and all my servers have both of them in the resolv.conf Our main dns server went down and suddenly no server could see each other. I edited a few of the servers resolv.conf manually and committed out the first (down) dns server and that machine would instantly be able to ping again. What did I do wrong, does it not auto switch to the secondary dns server when it times out? # File managed by puppet nameserver 192.168.146.100 nameserver 192.168.159.101 ;nameserver 72.14.188.5 domain example.com search example.com

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• A special user does not appear in Windows login screen

  - by shayan

  In the list of users (under Local Users and Groups in my Windows 7) I have an ASPNET user (its description says "Account used for running the ASP.NET worker process (aspnet_wp.exe)" and its full name is "ASP.NET Machine Account") The thing is this user does not appear in Windows login screen. What I have found: It is not a "Built-in security pricipal" user It belongs only to Users group I don't have HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts key in my registry In every sense I can see that it is a normal user yet it does not appear in login screen. Now the questions are: What does make it special? How can I create a user like this?

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• standart packages list

  - by Valintinr

  Im learning puppet system and now need to do next task. So we have few servers with same OS (Altlinux p6,t6) - puppet-agents and have puppet-master. On agents installed some packages, eg. 200 packages on first, 300 on second .... But necessary only 180 installed. We know names of necessary packages but dont know names of other (unnecessary packages) So task: Have i can check or install (if not installed yet) necessary packages and delete other packages (we dont know names of other installed packages) Help please WBR Valentin

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• How do I upgrade the BIOS to boot the motherboard when the CPU is not suported?

  - by Matt

  So I have a Tyan S8225 motherboard with a Valencia (Opteron 4200) CPU. Two of us have tried everything. We have even swapped the whole motherboard, Power supply, memory, even a different CPU (still Valencia). We even tried it without any memory installed and with only a single CPU. There are no beep codes as I suspect even those are controlled by the BIOS boot process. We put the whole thing on the bench with just the power supply, VGA, keyboard and network (for IPMI) connected. The IPMI is not even showing the BIOS starting, but the IPMI is working. After some hunting around, I discovered the claim on the website is that the Valencia CPU's are not supported on older BIOS revisions. For a start, I don't know what the bios revision is and if it's older but it's the only thing left. Could the BIOS be causing a board not to boot at all? If that's the case, then is there any other way to update the BIOS without buying an old CPU only to be put back in a box just to update the BIOS? Yes, we even tried updating the BIOS through IPMI but you can't do that either.

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• what reverse proxy server will direct traffic to healthy servers whose health is based on a result string

  - by joshua paul

  what reverse proxy server will direct traffic to healthy servers whose health is based on a result string?? ideally i'd like something like dnsmadeeasy or ultradns - lol - but for reverse proxy i have looked at pound, delegate, ha proxy, squid, varnish, nginx, apache, and cherokee but can't see that they will work - they only test for HTTP result code scenario client request www.aaa.com www.aaa.com is a reverse proxy reverse proxy looks at "test.php" on server 1.aaa.com, 2.aaa.com and 3.aaa.com for result string "OK" if the server is "OK" then proxy requests to them help!

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• IIS7 returns 403.1 (execute access denied) for image file

  - by Kristoffer

  I have a web app running in IIS7 on Windows Server 2008. There is a virtual directory pointing to a shared folder "/Content/Data" on another machine (running Windows Server 2003), as well as a real directory "/Content/Images" on the local machine (web app sub folder). Accessing images in "/Content/Images" is no problem, but when an image (e.g. a JPEG file) in the "/Content/Data" is accessed by a browser, IIS returns this error: HTTP Error 403.1 - Forbidden: Execute access is denied. However, the web app can read and write to / from it. I assume IIS and ASP.NET are running under different user accounts? Does anyone have an idea on what I have to do to make it work? I have set the permissions on the shared folder to Everyone Full Control, with no luck.

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• on Red Hat Enterprise and CentOS, what is creating /var/run/reboot-required?

  - by EdwardTeach

  On CentOS 5.8+ and Red Hat Enterprise 6+, when installing/updating packages, I notice a flag file /var/run/reboot-required is created when appropriate. On Ubuntu (and Debian too, I'm guessing), if package "update-notifier-common" is installed, a package postinst script triggers creation of this flag file. On RHEL/CentOS I can't figure out how this is happening. For instance, on RHEL and CentOS I recently installed several updates and /var/run/reboot-required was created. One of them was an "openssl" package upgrade. I assume this was what created the flag file, since on Ubuntu it also works this way. However I looked at all "rpm -q --scripts" for each updated package, and didn't see anything that was likely to have created that flag file. Mostly I saw "postinstall program: /sbin/ldconfig". So my questions are: What creates this flag file on RHEL/CentOS? Does it require a special package to be installed, analogous to the "update-notifier-common" package on Ubuntu?

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• django, mod_wsgi, MySQL High CPU - Problems

  - by Red Rover

  Good Evening, and thank you for reading this post. I am having a problem with Django after migrating the dB from SQLlite to MySQL. Initially, for the first 48hours, all ran well. But now we are experiencing high cpu about every 30 minutes. This is a production ESX4i VM host, with 2 x 2.8 ghz CPUs and 12 GB ram. I have allocated 4 cpu's to this VM and 4 GB memory. Any insight into this configuration and help with the spikes in CPU would be appreciated. IT is configured to use the prefork MPM. Outlined are the config's for the different services: MySQL Server version: 5.1.61 Source distribution Django 1.3 mod_wsgi Apache/2.2.15 httpd.conf Timeout 120 KeepAlive Off MaxKeepAliveRequests 400 KeepAliveTimeout 3 prefork MPM StartServers 8 MinSpareServers 8 MaxSpareServers 16 ServerLimit 40 MaxClients 40 MaxRequestsPerChild 0 worker MPM StartServers 16 MaxClients 1024 MinSpareThreads 64 MaxSpareThreads 256 ThreadsPerChild 64 MaxRequestsPerChild 10240 MySQL my.conf [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql symbolic-links=0 [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid my.cnf wsgi.conf LoadModule wsgi_module modules/mod_wsgi.so /etc/httpd/conf.d/wsgi.conf WSGISocketPrefix /var/run/wsgi WSGIPythonEggs /var/tmp WSGIDaemonProcess SITE maximum-requests=10000 WSGIProcessGroup SITE

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• Find out the type of an automounted device

  - by Steve Bennett

  I'm working on a system (Ubuntu Precise) with a mount defined in /etc/fstab as follows: /dev/vdb /mnt auto defaults,nobootwait,comment=cloudconfig 0 2 Originally I just wanted to find out if it's NFS (due to potential MySQL locking issues). Judging from man mount, it's not: If no -t option is given, or if the auto type is specified, mount will try to guess the desired type. Mount uses the blkid library for guessing the filesystem type; if that does not turn up anything that looks familiar, mount will try to read the file /etc/filesystems, or, if that does not exist, /proc/filesystems. All of the filesystem types listed there will be tried, except for those that are labeled "nodev" (e.g., devpts, proc and nfs). If /etc/filesystems ends in a line with a single * only, mount will read /proc/filesystems afterwards. But, out of curiosity now, how can I find out more about what type of device it actually is? (For context, this is a VM running on OpenStack. The device is a 60Gb allocation mounted from somewhere - but I don't know how.)` EDIT Including answers here: $ mount /dev/vdb on /mnt type ext3 (rw,_netdev) $ df -T /dev/vdb ext3 61927420 2936068 55845624 5% /mnt

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• Ubuntu 10.04: OpenVZ Kernel and pure-ftpd issues on HOST (no guest setup yet)

  - by Seidr

  After compiling and installing the OpenVZ flavour of kernel under Ubuntu 10.04, I am unable to browse to certain directories when connecting to the pure-ftpd server. The clients are dropping into PASSIVE mode, which is fine. This behaviour was happening before the change of kernel, however now when I browse to certain directories the connection just gets dropped. This only happens with a few directories under one login (web in specific), where as with another login it happens as soon as I connect. I've got the nf_conntrack_ftp kernel module installed (required to keep track of passive FTP connections as I understand, and an alias of the ip_conntrack_ftp module), however this has provided no alleviation of my problem. This module was actually required upon initial setup of my OS to get passive FTP working correctly, however when I compiled the OpenVZ kernel a lot of these modules were missing (iptables, conntrack etc). I recompiled the kernel with the missing modules, but to no effect. I've turned verbosity for the pure-ftpd server up, and still no clues have been spotted in either syslog or the transfer log. Neither did an strace provide any clues (that I could discern anyway) - although one strange thing is both in the output to the client and in the strace I notice that it does infact probe the directory and return the number of matches - it just fails after that. One more thing to mention is that if I FTP using the same credentials locally, everything works fine. This suggests that it is in fact an issue with either the conntrack_ftp module not functioning as expected, or a deeper networking issue. The Kernel was compiled and installed following the instructions at https://help.ubuntu.com/community/OpenVZ - bar the changes to the Kernel configuration (such as add iptables as a module). Below is an example of the log sent to the data (under FileZilla). Status: Resolving address of xxxx.co.uk Status: Connecting to 78.46.xxx.xxx:21... Status: Connection established, waiting for welcome message... Response: 220---------- Welcome to Pure-FTPd [privsep] [TLS] ---------- Response: 220-You are user number 4 of 10 allowed. Response: 220-Local time is now 08:52. Server port: 21. Response: 220-This is a private system - No anonymous login Response: 220-IPv6 connections are also welcome on this server. Response: 220 You will be disconnected after 15 minutes of inactivity. Command: USER xxx Response: 331 User xxx OK. Password required Command: PASS ******** Response: 230-User xxx has group access to: client1 sshusers Response: 230 OK. Current restricted directory is / Command: OPTS UTF8 ON Response: 200 OK, UTF-8 enabled Status: Connected Status: Retrieving directory listing... Command: PWD Response: 257 "/" is your current location Status: Directory listing successful Status: Retrieving directory listing... Command: CWD /web Response: 250 OK. Current directory is /web Command: TYPE I Response: 200 TYPE is now 8-bit binary Command: PORT 10,0,2,30,14,143 Response: 500 I won't open a connection to 10.0.2.30 (only to 188.220.xxx.xxx) Command: PASV Response: 227 Entering Passive Mode (78,46,79,147,234,110) Command: MLSD Response: 150 Accepted data connection Response: 226-ASCII Response: 226-Options: -a -l Response: 226 57 matches total Error: Could not read from transfer socket: ECONNRESET - Connection reset by peer Error: Failed to retrieve directory listing Any suggestions please? I'm willing to try anything!

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• How to fix? => Your system administrator does not allow the user of saved credentials to log on to the remote computer

  - by Pure.Krome

  At our office, any of our Windows 7 Clients get this error message when we try and RDP to a remote W2K8 Server outside of the office :- Your system administrator does not allow the user of saved credentials to log on to the remote computer XXX because its identity is not fully verified. Please enter new credentials A quick google search leads to some posts they all suggest I edit group policy, etc. I'm under the impression, that the common fix for this, is to follow those instructions -per Windows7 machine-. Ack :( Is there anyway I can do something via our office Active Directory .. which auto updates all Windows 7 clients in the office LAN?

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• Getting Server 2008 R2 to ignore all traffic from Internet-facing NIC, leaving it to a VM

  - by Wolvenmoon

  I got in to Server 2008 R2 via Dreamspark and would like to start learning on it. I don't have much option but to put it on a system sitting between the Internet and my home LAN due to electricity bills and the fact that 3 computers in an 11x11 space in 102 degree weather is pretty stygian. Currently I use a ClearOS gateway to manage everything, what I'd like to do is take my server 2008 R2 box, which has two NICs, and drop it at the head of my network. I'd want Server 2008 R2 to ignore all traffic on the external facing NIC and pass it to a virtual ClearOS gateway, and to put all its Internet traffic through its other NIC - which will face the rest of my network and be the default gateway for it. The theory is to keep the potentially vulnerable Server 2008 R2 install as tucked behind a Linux box as possible, without sacrificing too much performance. This is a home network that occasionally hosts dedicated game servers and voice chat servers, so most malicious activity is in the form of drive by non-targeted attacks, however, I don't trust Windows Server because I don't know the OS well enough, yet. So, three questions: How do I do this, am I going to be reasonably more secure doing this than if I just let the Server 2008 R2 rig handle all the network traffic and DHCP (not an option), and should I virtualize the Server 2008 R2 rig instead and if so in what? (Core 2 Duo e6600 w/ 5 gigs usable RAM)

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• What is the best/easiest way to use scripts to analyze network traffic?

  - by yungin

  I'm looking to analyze packets via scripts. I'd like to use something high level. I'm in a mac/linux environment. I'm currently looking at different python+libpcap libraries. Perhaps lua+wireshark too. Maybe tcpdump+bash (but not sure that has a lot of info i can use). I also heard good things about scapy. Not sure. I'm wondering if you have any recommendations? There's quite a few of them out there. What have you found that works best? I'd definitely want something scriptable not something that I need to compile (like c/c++, etc)

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• DELL switch 6248 port and mac mapping using SNMP

  - by Brad

  I have a Dell 6248 switch. I connect some of my servers to it and want to know which server nic connected to which switch port. I try using snmpwalk to get this information, but I just can get mac/ip mapping of my server nic from switch, I still can't get which switch port it connect. I try a tool named Managed Switch Port Mapping tool, it can show which switch port is connected to which nic/ip. I use WireShare to get all snmp packets but still can't find what's the snmp oid to get this information. Anyone knows how to get this?

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• What's the best way to know if your web server goes down?

  - by Mike Christensen

  I noticed my website only got 8 visitors today, which means it probably went down very early this morning and I never noticed. Why it went down is another story. Ideally, I'd like to be emailed if my web server becomes unresponsive or does not return an HTTP 200. Is there either a cloud-based service (either free or pretty cheap) that can monitor your website? If not, is there a good free/open source program I can run on either a Linux or Windows machine that will monitor a website and email me if it goes down? Thanks!

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• Huge host CPU usage in idle vmware guest. Ubuntu 10.04 host, Vista SP2 guest

  - by themesandmodules

  I'm experiencing huge host CPU usage with an idle vmware guest. Host: Ubuntu 10.04 32-bit 2.6.32-24-generic-pae. (Very new install, i.e 24 hours ago) Hardware is Dell XPS M1530 laptop, 4GB ram. Intel Core II Duo T9300 2.50Ghz The virtualization setting "VT" or something is enabled in my bios. Guest: Completely fresh install of Windows Vista, upgraded to latest SP2 and all windows updates installed. 1024 - 1512MB ram allocated. Absolutely no other software installed on it, apart from VMWare tools. Situation When the guest is doing absolutely nothing, I watch with sysinternals process watch on the guest. This shows that system idle process is between 70 and 99%, usually around 95%. No actual process doing anything. On the host, I watch with top, I get cpu usage of 20% - 80%, usually around 30%. What I have tried Single and Dual processor available to guest - no change. Turn off all peripherals to guest - no network, drives, usb etc - no change. Turn off 3d acceleration for guest - perhaps a small improvement, or no change. Upping allocated ram to guest from 1024MB to 1512MB - no change. Yelling at vmware - no change. I have experienced a similar issue in the past, which was solved by setting the guest to have 1 CPU. This time that hasn't worked.

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• Can't access a local site site on LAN

  - by Dilawar

  I have lighttpd setup on a machine (say ip is 10.107.105.13) with following details. inet addr : 10.107.105.13 Bcast : 10.107.111.255 Mask : 255.255.240.0 I can access my site on this computer by using firefox http://localhost/index.html. Now I am trying to access this site from another computer with following details inet addr : 10.14.42.7 Bcast : 10.14.42.255 Mask : 255.255.255.0 But it says 'access denied'. nmap 10.107.105.13 gives the following output. PORT STATE SERVICE 22/tcp open ssh 80/tcp open http 1234/tcp open hotline 3306/tcp open mysql 9418/tcp open git Following is the output of iptables -L -n -v on 10.107.105.13 141 11207 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 FORWARD and OUTPUT section empty. What is wrong with all this?

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• Consolidate SQL Server Reporting Services

  - by Eric C. Singer

  I've been a big fan of consolidating as many DB's to a few SQL servers for a while and I've had great success with it. However, I've never had to deal with SQL reporting services. Has anyone migrated SSRS from a bunch of random SQL servers into a consolidated SQL server? I don't exactly know a whole lot about SSRS which is part of the problem. To my knowlege, it's one DB per SSRS instance, so it sounds like i'd need to find a way of exporting data and merging it. Basically the process used to look like: Move DB from SQL Express to shared SQL server Change point in APP to point at new SQL server With reporting services, how do I move the reporting service compenent of the DB as well? I realize I may need to tweak the app, but my question is on the SQL side.

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• Resolving System Restore error - Error 0x800423F3 - The writer experienced a transient error

  - by Gishu

  System restore just stopped working, when I needed it most. (tried diff restore points... same error). Now everytime I run system-restore, it fails with the above error message. I cleared the event logs and retried to isolate the relevant events. I see 5 warnings and 1 info event from VSS and 1 error from System Restore. Here's the first warning from VSS and the error http://dl.dropbox.com/u/11733224/SystemRestore-FirstWarning.txt http://dl.dropbox.com/u/11733224/SystemRestore-FirstError.txt Tried a lot of stuff, but in vain; this error still persists.

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• Remove auto-complete field entries in Google Chrome

  - by NT.

  Is there a way to stop the gmail address field (on the login page) from displaying all the gmail addresses that you have ever typed in it? When logging in with Google Chrome or trying to set up a new account, anything you type which starts with the same letter as the one that you are trying to use currently will show up in the auto-complete field, I don't want that. I understand that this is a convenient feature in some cases, but the thing is--I know this shouldn't've happened, but it has actually happened more than once--I sometimes mistyped my password in the Gmail address field right after the address, mistakingly assuming that the prompt had already been moved to the password field, and then hit "Enter" without looking first. The next time I tried to enter my Gmail address, it popped up the address followed by my password as one of the entries on the list of email addresses that shows up, and I couldn't get rid of the entry. Is there a way to remove these?

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• My Unicomp Model M is double-striking on a key. What to do?

  - by Alex

  I realize this isn't strictly a computer-related question, but I figured that if there's any place to go for help about a broken keyboard, it would be a power users' forum. The O key on my Unicomp Model M has the tendency to strike twice. In other words, I press the key once, and it sends out two letters. There is probably a mechanical solution to this, but I'm not familiar enough with how these things work to come up with a fix myself. Has anyone had this problem?

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• how to tune libstdc++ to the native architecture when building gcc

  - by John D

  I recently found that when I build my C++ software, I get about a 10% speedup by using the g++ march=native option. When compiling gcc and libstc++, is it possible to tune the libstdc++ library to the native architecture as well? I couldn't find any mention of this in the gcc install configuration documentation. (I'm building gcc 4.6.2 on Linux Mint 11 with an Intel Core i7 Sandy Bridge-E processor.)

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• Dichroic Glass in Blender

  - by KalAurum

  I am trying to use blender to simulate the Lycurgus Cup. The cup is an example of dichroic (two-color) glass, and appears green when a light source is on the outside of the cup, and appears red when a light source is inside the cup. Here is an image of when light is outside and it appears green: Here is an image of when light is inside and it appears red: I have created a glass cup in blender. I have made the glass a red color, and then used the colorbands under the Object-Material/Shading-Ramps tab to add green specular and diffuse color. However, this makes the glass appear the same mix of red and green whether I put the light source on the inside or outside the cup. An example can be seen here: According to the second post here, someone was able to to fake the effect of a dichroic glass in blender rather easily through the use of a magic procedural texture but they provide no clues on how to do this (in blender). Does anyone know how to achieve this effect in blender?

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• apply seach criteria to whole cells

  - by Tom

  I am trying to use MATCH() and/or LOOKUP() in LibreOffice Calc. I have the "Search criteria = and < must apply to whole cells" and the "Enable regular expressions in formulas" options selected. The item I am looking for is a multi word string. How do I provide a search criteria as a cell reference (E3) in to LOOKUP(E3, B1:B20, C1:C20) and have it match the value in B1:B20 EXACTLY? Right now it is matching partial strings rather than matching the cell values exactly.

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• Unix/Linux find and sort by date modified

  - by Richard Easton

  How can I do a simple find which would order the results by most recently modified? Here is the current find I am using (I am doing a shell escape in PHP, so that is the reasoning for the variables): find '$dir' -name '$str'\* -print | head -10 How could I have this order the search by most recently modified? (Note I do not want it to sort 'after' the search, but rather find the results based on what was most recently modified.)

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