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• Invalid operation dist-ugprade

  - by drdarwin

  i'm running Apache 2 on Debian at my VPS. Naturally i have problem with restricted GD-library of my php package and i need to fix it (i need imagerotate() function). Before installing php-gd pugin it's necessary to update php 5.2 to php 5.3 my /etc/apt/sources.list is: #deb http://ftp.ru.debian.org/debian/ lenny main contrib non-free #deb http://security.debian.org lenny/updates main contrib non-free #deb http://ftp.ru.debian.org/debian lenny main #deb-src http://volatile.debian.org/debian-volatile lenny/volatile main contrib deb http://packages.dotdeb.org stable all deb-src http://packages.dotdeb.org stable all The problem comes after apt-get dist-ugprade executing: /$ apt-get update Hit http://packages.dotdeb.org stable Release.gpg Hit http://packages.dotdeb.org stable Release Ign http://packages.dotdeb.org stable/all Packages/DiffIndex Ign http://packages.dotdeb.org stable/all Sources/DiffIndex Hit http://packages.dotdeb.org stable/all Packages Hit http://packages.dotdeb.org stable/all Sources Reading package lists... /$ apt-get dist-ugprade E: Invalid operation dist-ugprade What can cause this problem? How much should i wait while Reading package lists...? Is there any simple guideline for further php-gd installation?

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• nagios wrongly reports packet loss

  - by Alien Life Form

  Lately, on my nagios 3.2.3 install (CentOS5, monitoring ~ 300 hosts, 1150 services) has sdtarted to occasionally report high packet loss on 50-60 hosts at a time. Problem is it's bogus. Manual runs of ping (or its own check_ping binary) finds no fault with any of the affected hosts. The only possible cures I found so far are: run all the checks manually (they will succeed but it may act up again on next check) acknowledge and wait for the problem to go away (may take several ours) I suspect (but have no particular reason other than single rescheduled checks succeeding) that the problem may lay with all the checks being mass scheduled together - in which case introducing some jitter in the scheduling (how?) might help. Or it may be something completely different. Ideas, anyone?

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• How do I make compiling code not bring my system to its knees?

  - by Jason Baker

  I have a macbook with snow leopard and 2 gigs of RAM. When I compile C or C++ code, my system becomes all but unusable. For instance, when I compile llvm I notice that there are about 10 or 11 processes (cc1plus) getting launched at a time that suck up my CPU time and memory. Is there any way to maybe make it compile less at one time? I'll gladly wait a while longer to have my system usable while I'm compiling. Or is this something that you just have to live with when compiling C or C++?

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• SYN flooding still a threat to servers?

  - by Rob

  Well recently I've been reading about different Denial of Service methods. One method that kind of stuck out was SYN flooding. I'm a member of some not-so-nice forums, and someone was selling a python script that would DoS a server using SYN packets with a spoofed IP address. However, if you sent a SYN packet to a server, with a spoofed IP address, the target server would return the SYN/ACK packet to the host that was spoofed. In which case, wouldn't the spoofed host return an RST packet, thus negating the 75 second long-wait, and ultimately failing in its attempt to DoS the server?

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• CentOS - dual boot from new partition

  - by Dima

  I need to install two copies of the CentOS 5.5 (bank A and bank B) on different partitions of the same hard disk and install grub boot loader to another partition (visible from both banks). The boot loader should redirect the boot menu to bank A or bank B (according to the configuration). The new partition is mounted to /common_partition and grub is installed on it using following command: grub-install /dev/hda In the new partition I'm created the following menu.lst file: title BOOTCONTROL REDIRECT : PLEASE WAIT root (hd0,1) configfile /boot/menu.lst boot On my setup: both partitions (bank A and bank B) are primary and grub is installed on MBR. The problem is: but the new boot loader (on common_partition) did not load. What wrong on my configuration?

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• How to redirect (or Alias) jump page with Apache

  - by Meltemi

  I'm not an Apache expert but need to make a small change to a web server. We are introducing a "jump page" URL that is different from a primary URL (for tracking reasons). /productA/index.html /productA/jump_index.html Basically i want to log that jump_index.html was requested and then return index.html. I don't want the client to wait 8 seconds or so for a redirect. How should we be handling this? Simply symlink (or alias) the file in the filesystem? Use mod_alias Alias Match (if so how exactly)? something better still? Edit: mod_rewrite in httpd.conf: <IfModule mod_rewrite.c> RewriteEngine On RewriteCond %{REQUEST_METHOD} ^TRACE RewriteRule .* - [F] </IfModule>

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• GDM login screen is not displayed with VNC

  - by niboshi

  Hi, I set up VNC server with xinetd. Also configured GDM so that XDMCP is enabled. VNC connection seems okay, but GDM login screen is not shown. Instead I can only see old bare X screen (gray meshed background and X-shaped mouse pointer), which I can't do any interaction with it. What can I do to fix the problem? No log is written below /var/log/. Server distribution: Ubuntu marverick /etc/xinetd.d/vnc is like below: service vnc1024 { disable = no socket_type = stream protocol = tcp wait = no user = nobody server = /usr/bin/Xvnc server_args = -inetd -query localhost -geometry 1024x768 -depth 24 -once securitytypes=none port = 12345 } /etc/gdm/custom.conf: [daemon] [security] DisallowTCP=false [xdmcp] Enable=true [gui] [greeter] [chooser] [debug] [servers] /etc/services is also configured. Thanks

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• My PC becomes very slow after changing page file in XP.

  - by Jane

  Hello there, I have 5 partitions in my computer (C, D, E, F, G), and C: is the system partition. Recently I changed the page file setting to use 768-768 MB from the G:, without changing the C: default value (256-512 MB). Everything runs fine until I rebooted my PC. I unset the G:'s page file before I rebooted my PC. Well, after I rebooted my PC, my XP becomes VERY slow. damn slow. I don't know how long I wasted to wait for the boot screen to disappear. (Well, maybe about 1-3 mins. Normally it is under 10 secs) and when I tried to enter the desktop, it just like using a computer without a VGA card, or VGA driver installed. Very slow. Any suggestions to fix this problem? Because I hate to repair-install my XP =\ Thanks.

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• 503 service unavailable when debugging PHP script in Zend Studio

  - by user25932

  I have a web server with apache 2.0 installed. It comes with Zend Server install pack. When I’m trying to debug my php files apache serves a blank page with 503 service unavailable. Of course slow server-side code is tying up Apache requests for far too long, but I need it to wait, until my debugging comes to end. When I call to the page from a browser it launches ZendStudio debugging my PHP script (request redirects Zend Debugger module). I debug through my script and if I finish debugging in 120 seconds, I normally return to the browser. When it takes more than 120 seconds the browser displays '503 service unavailable' and I can't return to page output. I have even forced 'max_execution_time = 300' 'max_input_time = 600' in php.ini and 'TimeOut = 500' in httpd.conf. No matter whether it is Opera, IE or Firefox. I spent two days googling it, no right answer until now.

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• Windows server 2008 r2 console stuck at "waiting for user profile service"

  - by support

  Hi, I have a windows 2008 R2 server, running on dell poweredge t300. Using hyper-v to run a windows 2008 R2 server also. Suddenly, today, my virtual console (on the virtual copy of windows 2008 server r2) will not let me login as administrator. It starts to login but then sticks at the message: Please wait for the User profile Service and is unresponsive to keypresses (incl ctrl-alt-del). The only way out is a crash. It starts up in safe mode without networking ok but not in safe mode with networking. Any suggestions on how to fix this would be appreciated Thanks

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• Time tracking tool for monitoring application usage

  - by wizlog

  I want to know how I'm really using my computer, and where the time goes (eg. I have an English paper due, and I intend on getting it done, its 2:30 PM... no wait, its 8:30 PM...). What software can tell me- a. what programs I use, and when b. within programs like Google Chrome or Firefox, which tabs do I spend the most time on. (So I know if I'm spending the time playing a game, or watching a movie on Hulu...)

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• C - circular character buffer w/ pthreads

  - by Matt

  I have a homework assignment where I have to implement a circular buffer and add and remove chars with separate threads: #include <pthread.h> #include <stdio.h> #define QSIZE 10 pthread_cond_t full,/* count == QSIZE */ empty,/* count == 0 */ ready; pthread_mutex_t m, n; /* implements critical section */ unsigned int iBuf, /* tail of circular queue */ oBuf; /* head of circular queue */ int count; /* count characters */ char buf [QSIZE]; /* the circular queue */ void Put(char s[]) {/* add "ch"; wait if full */ pthread_mutex_lock(&m); int size = sizeof(s)/sizeof(char); printf("size: %d", size); int i; for(i = 0; i < size; i++) { while (count >= QSIZE) pthread_cond_wait(&full, &m);/* is there empty slot? */ buf[iBuf] = s[i]; /* store the character */ iBuf = (iBuf+1) % QSIZE; /* increment mod QSIZE */ count++; if (count == 1) pthread_cond_signal(&empty);/* new character available */ } pthread_mutex_unlock(&m); } char Get() {/* remove "ch" from queue; wait if empty */ char ch; pthread_mutex_lock(&m); while (count <= 0) pthread_cond_wait(&empty, &m);/* is a character present? */ ch = buf[oBuf]; /* retrieve from the head of the queue */ oBuf = (oBuf+1) % QSIZE; count--; if (count == QSIZE-1) pthread_cond_signal(&full);/* signal existence of a slot */ pthread_mutex_unlock(&m); return ch; } void * p1(void *arg) { int i; for (i = 0; i < 5; i++) { Put("hella"); } } void * p2(void *arg) { int i; for (i = 0; i < 5; i++) { Put("goodby"); } } int main() { pthread_t t1, t2; void *r1, *r2; oBuf = 0; iBuf = 0; count=0; /* all slots are empty */ pthread_cond_init(&full, NULL); pthread_cond_init(&empty, NULL); pthread_mutex_init(&m, NULL); pthread_create(&t1, NULL, p1, &r1); pthread_create(&t2, NULL, p2, &r2); printf("Main"); char c; int i = 0; while (i < 55) { c = Get(); printf("%c",c); i++; } pthread_join(t1, &r1); pthread_join(t2, &r2); return 0; } I shouldn't have to change the logic much at all, the requirements are pretty specific. I think my problem lies in the Put() method. I think the first thread is going in and blocking the critical section and causing a deadlock. I was thinking I should make a scheduling attribute? Of course I could be wrong. I am pretty new to pthreads and concurrent programming, so I could really use some help spotting my error.

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• Network Path not found while joining Active Directory

  - by Chiggins

  So I have an Amazon EC2 box running Windows Server 2008 with Active Directory installed on it. I also have a Windows 7 virtual machine, which is set to use the Active Directory box as its DNS and WINS server. I'm trying to join the virtual machine to the domain, and I'm asked for authentication. I give authentication, wait a minute, and I get an error saying: The following error occurred attempting to join the domain "ad.chigs.me": The network path was not found. How can I fix this so that I'll be able to join the domain?

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• Dell Dimension running Fedora12 does a "Sleeping Beauty" and I am not am not a "handsome prince"!

  - by Jim Dobbs

  Dell Dimension 2350 with a Pentium IV processor and integrated video and network chips running Fedora12 does a "Sleeping Beauty" and I, apparently, am not am not a "handsome prince"! The system puts video and network to sleep and it will not wakeup. I have heard of this problem on laptops, but this is a tower. Any ideas or help is appreciated. I tried to ping the network card from another system and ping fails. The logs indicate that the system continues to be active. Pressing keyboard short-cut keys makes the disk light blink but neither the video or network card comes alive. Failing all else, are there any Linux commands that I could schedule in cron to pulse video and network adapters hourly that will keep them awake? Or, should I wait on Fedora13? Before this machine, I built a Dimension 2400 with Pentium IV and it had the same problem. Fedora9 on the same hardware is fine.

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• Mysql Master-ColdMaster

  - by enedebe

  I explain my case: I'm at Amazon AWS and I want to be fault tolerant on a entire region failure. My basic problem is to have the db in sync with 2 regions. My options: Master-Master (high lag) Hand made sync every 5 minutes Master-ColdMaster?! (copy on the fly but Master won't wait the other region commit) In my system we could afford loosing a piece of data (we're not a bank) the last inserts in the db, but we could not afford more than 10 minutes of downtime. The database is small and the level of inserts is low, and I wouldn't affect the normal usage waiting other region commit. Is the 3 solution posible? And the most important, once the primary fail how we can detect and change the rol between master-coldmaster -- coldmaster-master ? Is there any clean-mode to restore between failure? Thank's!

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• Nginx request forking

  - by Adam

  Hi, I'm wondering if nginx can "fork" a request. Let's imagine config: upstream backend { server localhost:8080; ... more servers here } server { location /myloc { FORK-REQUEST http://my-other-url:3135/something proxy_pass http://backend; } } I would like nginx to send a copy of request to the url specified by FORK-REQUEST and after that to load balance it with backend servers and return the response to the client. As I don't need the response from FORK-REQUEST it would be best if this request was async so normal prcessing doesn't have to wait. Is a scenario like this possible?

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• How to properly use windows xp mode

  - by user23950

  I just want to know how could I access the applications installed on xp mode in windows 7. I just installed the application in the default location in xp mode which is c:\program files Do I have to install it on the drive where windows 7 is installed so that I could access it quickly? Because I still have to wait for about 2-4 minutes just to open up a word document(ms office installed in xp mode) that is saved in my desktop in my physical machine. Please help. Details: 2Gb of Ram Pentium Dual Core processor 250GB of HDD

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• VGA resolution with Sony Bravia TV

  - by prestomation

  I just bought Sony Bravia KDL40S5100 tv. The VGA input is acting weird. I have a Gateway desktop with Windows 7 and Intel 945 graphics. I also have a laptop running Ubuntu 9.04. The TV will not display the gateway when the resolution is over 1360x768, I have to wait for it to time out and bring me back. The Intel driver even urges me to switch to the "recommended" 1920x1080. I just installed Win7 using this tv as the monitor. When the orginial welcome screen started after setup, it started me at 1080. I had to start in safemode to set a res that would work! When I plug my laptop into the TV, 1920x1080 works just fine. Any ideas? This laptop also has Win7, which I am going to try, but I haven't gotten a chance yet.

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• aligning truecrypt partition on 1.5TB 4kB sector drive

  - by pQd

  hi, aligning partitions to start at real physical sector of ssds / stripped raids / 4kB drives is a 'good thing to do'. but i've run into a problems when trying to do it for a truecrypt partition that will contain ext3 on it. or so it seems. when drive is question is partitioned properly and formatted with ext3 i get very reasonable write speeds around 70-80MB/s, but when i put truecrypt and ext3 on the top of it write performance becomes very unstable and goes between 1-25MB/s with very high io-wait. on the same server i dont have any performance issues with ext3 on the top of truecrypt on regular 512B-sector 500GB sata disks. so my best guess is that iowaits are caused by misalignment but i cannot really find reliable information on how to calculate optimal partition beginning. i've tried to start it at 128 logical sector, i've also tried 8132 sector as suggested here but both gave me very bad and unstable performance. do you have any experience with similar setup? thanks!

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• How to get LAN ip to a variable in a Windows batch file

  - by Ville Koskinen

  I'm streaming audio from my Windows 7 laptop to a sound card attached to a router. I have a little batch script to start streaming. REM Kill any instances of vlc taskkill /im vlc.exe "c:\Program Files\VideoLAN\VLC\vlc.exe" <parameters to start http streaming> REM Wait for vlc TIMEOUT /T 10 REM start playback on router plink -ssh [email protected] -pw password killall -9 madplay plink -ssh [email protected] -pw password wget -q -O - http://192.1.159:8080/audio | madplay -Q --no-tty-control - & As you see the http stream is hard coded. It would be nice to get the address dynamically to reuse the script on other machines. Any ideas?

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• Configure postfix to filter email into hold queue

  - by Ian

  Hey, I would like postfix to send all emails received on SMTP off to an external process, which will decide whether to allow them through as normal, or whether to put them into the hold queue (or another quarantine area), where they have to wait for admin approval. I was thinking of doing this with an after-queue content filter, which uses pipe(8) to run a script on each message, and the script itself will spawn "postsuper -h " if it decides to put the message on hold. Then the admin can do postsuper -d or -r to delete or pass the message on as appropriate. So, my questions are - a) will this work, and b) is this the best way to do it? Would a milter or another type of content filter be a better approach?

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• Windows 8 - Synaptics driver - Mouse keeps freezing

  - by KickAss

  I have Win-8 Pro installed on my Dell XPS. This has Synaptic PS/2 Port TouchPad. As I upgraded the Laptop from Win7 to Win8 all my factory Mouse software (along with other preinstalled software) was all deleted. So for the mouse, I installed Windows 8/7/XP/Vista 64/32-bit Edition v16.3.15.1. Problem - every few seconds (or minutes at times), the mouse freezes. Windows is still working, it's just the mouse. I have to wait 5-15 seconds before the mouse works again. I thought this was because the Synaptic Driver I am installing is not Win-8 compatible but this is not the case. It seems the mouse freezes when Windows is working, loading or opening new programs/windows. I have the same problem in my other Laptop which has upgraded Win8 pro. This is a Dell Studio. What's causing this?

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• TFTP PUT Failing Across Hosts

  - by Jason

  I have a TFTP server installed on a CentOS host. /etc/xinetd.d/tftp: service tftp { disable = no socket_type = dgram protocol = udp wait = yes user = root server = /usr/sbin/in.tftpd server_args = -c -s /var/lib/tftpboot per_source = 11 cps = 100 2 flags = IPv4 } If I try to PUT a file from a remote host to the host running the TFTP server, I get Transfer Timed Out - however, it does create the file in /var/lib/tftpboot but the file is empty. If I tftp from the tftp server to itself (localhost) and PUT a file, it works fine. I have verified that SELinux is disabled and IPTables are turned off. I can connect from the remote hosts with no issue - just seems to be the PUT I have issue with: [root@SVR01 TEST]# tftp 10.100.2.15 tftp> status Connected to 10.100.2.15. Mode: netascii Verbose: off Tracing: off Literal: off Rexmt-interval: 5 seconds, Max-timeout: 25 seconds tftp>

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• What is Mobsync.exe? Assuming I don't need it, can I disable it in Windows 7 without ill side effect

  - by Chris W. Rea

  I'm running Windows 7. Occasionally when I resume my computer from standby, it seems to wait 20-30 seconds or so before giving me full control back. In an attempt to diagnose why, I've been watching what's going on using the awesome Process Explorer. One of the processes I've noticed being started during that hiccup time is Mobsync.exe, described as "Microsoft Sync Center". Sync? Sync what? So, what is Mobsync.exe used for, exactly? Assuming I don't need its functionality, can I disable it in Windows 7 without ill side effect? If so, what's the best way to disable Mobsync.exe?

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• How can a single disk in a hardware SATA RAID-10 array bring the entire array to a screeching halt?

  - by Stu Thompson

  Prelude: I'm a code-monkey that's increasingly taken on SysAdmin duties for my small company. My code is our product, and increasingly we provide the same app as SaaS. About 18 months ago I moved our servers from a premium hosting centric vendor to a barebones rack pusher in a tier IV data center. (Literally across the street.) This ment doing much more ourselves--things like networking, storage and monitoring. As part the big move, to replace our leased direct attached storage from the hosting company, I built a 9TB two-node NAS based on SuperMicro chassises, 3ware RAID cards, Ubuntu 10.04, two dozen SATA disks, DRBD and . It's all lovingly documented in three blog posts: Building up & testing a new 9TB SATA RAID10 NFSv4 NAS: Part I, Part II and Part III. We also setup a Cacit monitoring system. Recently we've been adding more and more data points, like SMART values. I could not have done all this without the awesome boffins at ServerFault. It's been a fun and educational experience. My boss is happy (we saved bucket loads of $$$), our customers are happy (storage costs are down), I'm happy (fun, fun, fun). Until yesterday. Outage & Recovery: Some time after lunch we started getting reports of sluggish performance from our application, an on-demand streaming media CMS. About the same time our Cacti monitoring system sent a blizzard of emails. One of the more telling alerts was a graph of iostat await. Performance became so degraded that Pingdom began sending "server down" notifications. The overall load was moderate, there was not traffic spike. After logging onto the application servers, NFS clients of the NAS, I confirmed that just about everything was experiencing highly intermittent and insanely long IO wait times. And once I hopped onto the primary NAS node itself, the same delays were evident when trying to navigate the problem array's file system. Time to fail over, that went well. Within 20 minuts everything was confirmed to be back up and running perfectly. Post-Mortem: After any and all system failures I perform a post-mortem to determine the cause of the failure. First thing I did was ssh back into the box and start reviewing logs. It was offline, completely. Time for a trip to the data center. Hardware reset, backup an and running. In /var/syslog I found this scary looking entry: Nov 15 06:49:44 umbilo smartd[2827]: Device: /dev/twa0 [3ware_disk_00], 6 Currently unreadable (pending) sectors Nov 15 06:49:44 umbilo smartd[2827]: Device: /dev/twa0 [3ware_disk_07], SMART Prefailure Attribute: 1 Raw_Read_Error_Rate changed from 171 to 170 Nov 15 06:49:45 umbilo smartd[2827]: Device: /dev/twa0 [3ware_disk_10], 16 Currently unreadable (pending) sectors Nov 15 06:49:45 umbilo smartd[2827]: Device: /dev/twa0 [3ware_disk_10], 4 Offline uncorrectable sectors Nov 15 06:49:45 umbilo smartd[2827]: Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error Nov 15 06:49:45 umbilo smartd[2827]: # 1 Short offline Completed: read failure 90% 6576 3421766910 Nov 15 06:49:45 umbilo smartd[2827]: # 2 Short offline Completed: read failure 90% 6087 3421766910 Nov 15 06:49:45 umbilo smartd[2827]: # 3 Short offline Completed: read failure 10% 5901 656821791 Nov 15 06:49:45 umbilo smartd[2827]: # 4 Short offline Completed: read failure 90% 5818 651637856 Nov 15 06:49:45 umbilo smartd[2827]: So I went to check the Cacti graphs for the disks in the array. Here we see that, yes, disk 7 is slipping away just like syslog says it is. But we also see that disk 8's SMART Read Erros are fluctuating. There are no messages about disk 8 in syslog. More interesting is that the fluctuating values for disk 8 directly correlate to the high IO wait times! My interpretation is that: Disk 8 is experiencing an odd hardware fault that results in intermittent long operation times. Somehow this fault condition on the disk is locking up the entire array Maybe there is a more accurate or correct description, but the net result has been that the one disk is impacting the performance of the whole array. The Question(s) How can a single disk in a hardware SATA RAID-10 array bring the entire array to a screeching halt? Am I being naïve to think that the RAID card should have dealt with this? How can I prevent a single misbehaving disk from impacting the entire array? Am I missing something?

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