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• Apache MaxClients reaching max 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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• 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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• Swap space maxing out - JVM dying

  - by travega

  I have a server running 3 WordPress instances, MySql, Apache and the play framework 2.0 on 64m initial & max heap. If I increase the max heap of the JVM that play is running in even by 16m I see the 128m of swap space steadily fill up until the the JVM dies. I notice that it is only when I am plugging away at the wordpress sites that the JVM will die. I assume this is because the JVM is not asking for memory at the time so gets collected. I notice that when I restart Apache I reclaim about half of my swap and RAM. So is there some way I can configure apache to consume less memory? Also what could be causing the swap space to get so heavily thrashed with just 16m added to the max heap size of the JVM? Server running: Ubuntu 12.04 RAM: 408m Swap: 128m Apache mods: alias.conf alias.load auth_basic.load authn_file.load authz_default.load authz_groupfile.load authz_host.load authz_user.load autoindex.conf autoindex.load cgi.load deflate.conf deflate.load dir.conf dir.load env.load mime.conf mime.load negotiation.conf negotiation.load php5.conf php5.load proxy_ajp.load proxy_balancer.conf proxy_balancer.load proxy.conf proxy_connect.load proxy_ftp.conf proxy_ftp.load proxy_http.load proxy.load reqtimeout.conf reqtimeout.load rewrite.load setenvif.conf setenvif.load status.conf status.load

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• Server high memory usage at same time every day

  - by Sam Parmenter

  Right, we moved one of our main sites onto a new AWS box with plenty of grunt as it would allow us more control that we had before and future proof ourselves. About a month ago we started running into issues with high memory usage at the same time every day. In the morning an export is run to export data to a file which is the FTPed to a local machine for processing. The issues were co-inciding with the rough time of the export but when we didn't run the export one day, the server still ran into the same issues. The export has been run at other times in the day since to monitor memory usage to see if it spikes. The conclusion is that the export is fine and barely touches the sides memory wise. No noticeable change in memory usage. When the issue happens, its effect is to kill mysql and require us to restart the process. We think it might be a mysql memory issue, but might just be that mysql is just the first to feel it. Looking at the logs there is no particular query run before the memory usage hits 90%. When it strikes at about 9:20am, the memory usage spikes from a near constant 25% to 98% and very quickly kills mysql to save itself. It usually takes about 3-4 minutes to die. There are no cron jobs running at that time of the day and we haven't noticed a spike in traffic over the period of the issues. Any help would be massively appreciated! thanks.

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• Using multiple computers effectively

  - by Benjamin Oakes

  I have some extra (old) Macs and PCs around the house and a MacBook that's sometimes overworked. I'm looking for tips on using multiple computers effectively. Basically, I'd like to add to the following list. Here's what I'm using so far: Teleport: lets you use a single mouse and keyboard to control several Macs, like Synergy Built-in file sharing: lets me run programs on another Mac, but only maintain one copy of the data Bazaar: distributed version control Mail.app, Thunderbird, etc.: IMAP for my mail accounts TuneConnect: control iTunes on another Mac with a nice interface, using the library on my MacBook (if I choose it by pressing option at startup) over file sharing OmniFocus: syncs across computers pretty seamlessly Web browsing across computers VNC/Remote Desktop Running X-windows programs using ssh -Y hostname for headless operation (but they die when I sleep the connecting computer -- something like GNU screen would be ideal) Plain-old ssh with GNU screen Really, a better idea of what I do might be necessary. Generally though, I'd like to distribute tasks across more than one computer when possible, but not have much overhead in doing so. The perfect solution? An Xgrid-like program that pushes processing across multiple computers automatically and seamlessly (although that seems unlikely). Here's what I have, in case it makes a difference: MacBook (Dual 2.16 GHz, OS X 10.6.3) eMac (1.25 GHz, OS X 10.4.11, soon to be 10.5) Dell Dimension (800 MHz, some version of Ubuntu) -- no dedicated monitor PowerMac G3 (400 MHz, OS X 10.4.11) -- no dedicated monitor iMac G3 DV (400 MHz, OS X 10.4.11) -- currently in the kitchen for recipes, email, web browsing, music, movies (DVDs), etc. (Total, they cost me around $650, mostly for the MacBook. Freecycle is wonderful, just in case you haven't heard of it.) I'm really only using the MacBook and eMac at this point, but I'd like to push more onto it and possibly the PowerMac and Dell.

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• Why would my HDD main partition suddenly become hidden?

  - by Luis Oscar

  A few days ago I was using my computer as usual and I turned it off. The next day it wouldn't boot up. It just stayed after the hardware diagnostic window on the intermittent underscore screen. So clearly It wasn't booting up. I tried turning it on and off a couple of times with no avail. Finally I used windows 7 disk and it seemed as if there was no HDD. not even the installation would see the HDD. So i thought it was dead, i bought a new one installed it with windows and used a external case with the old HDD. plug it in and still couldn't see it. I finally downloaded a partition program EASUS or something and my HDD was there listed WITHOUT a system letter. I could however explore it and i set it as Unhidden and it came back to life. I could see it normally. I really just wish someone could explain to me what happened here, was it a virus? does it means the HDD is about to die? How can i prevent this or what should I do now? should i stop using this OLD HDD? Thanks

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• can't get php mail() working on Ubuntu desktop version with sendmail and postfix

  - by user36428

  I'm running Ubuntu 9.10 LAMP and trying to do a simple email test with PHP and I'm not getting any emails sent. mail("[email protected]", "eric-linux test", "test") or die("can't send mail"); I get no errors from PHP when running that script. In my php.ini file is: sendmail_path = /usr/lib/sendmail -t -i $ sudo ps aux | grep sendmail eric 2486 0.0 0.4 8368 2344 pts/0 T 14:52 0:00 sendmail -s “Hello world” [email protected] eric 8747 0.0 0.3 5692 1616 pts/2 T 16:18 0:00 sendmail eric 8749 0.0 0.3 5692 1636 pts/2 T 16:18 0:00 sendmail start eric 9190 0.0 0.3 5692 1636 pts/2 T 19:12 0:00 sendmail start eric 9192 0.0 0.3 5692 1616 pts/2 T 19:12 0:00 sendmail eric 9425 0.0 0.3 5692 1620 pts/1 T 19:37 0:00 sendmail eric 9427 0.0 0.3 6584 1636 pts/1 T 19:37 0:00 sendmail restart eric 9429 0.0 0.3 5692 1636 pts/1 T 19:38 0:00 /usr/lib/sendmail restart eric 9432 0.0 0.1 3040 804 pts/1 R+ 19:38 0:00 grep --color=auto sendmail When I run $ sendmail start it just hangs there doing nothing. I installed postfix also to see if it would help, but it didn't. I tried to see port 25: eric@eric-linux:~$ telnet localhost 25 Trying ::1... Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 eric-linux ESMTP Postfix (Ubuntu) thanks

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• Windows Media Based video audio converter?

  - by acidzombie24

  This may seem like an odd question. Right now ONLY windows media player, VLC and media player classic opens and plays my audio video correctly. Virtualdub plays it back with the wrong framerate and losses the audio, Avidemux 2.5 seems to be able to dump the audio/video but the video (like all other apps) is either a bad framerate or is wrong (glitches and bad framerate or bad dump). Nothing recognizes the audio file and when playing the video Avidemux (and most other things) die. FFMPEG cant seem to split the video or audio (using copy -an and etc) and this is getting me very angry. VLC dumps the video incorrectly when i try dumping it with that too. What can i use to convert the video? its streaming so it starts at 26mins in and ends at 28 (this is where apps have the problem. They dont know this and fudge everything or crash). I manage to dump the audio with Avidemux but virtualdub and ffmpeg says unreconized codec. Even if i cant convert it (it seems compressed enough) i want to at least attach it back into an AVI.

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• Ubuntu 11.10 ATI Drivers vesa park

  - by Matthias

  This is probably not an issue, from all I can get it seems my hardware and drivers are properly installed. However when I go to system settings - system info - graphics. I get Driver: VESA:PARK. Experience: Standard. my graphics card is a: Ati Mobility Radeon HD 5470 512MB. I am pretty sure it's not a same-die GPU since there is a fan exhaust at the side of my laptop which I presume is the exhaust for the GPU... I have no clue whatsoever what this means. I installed the ati drivers first using the 'additional drivers' method. However I also decided to look a manual installation up via the terminal since I've had problems before with Ubuntu and ati cards. I used wget and something among the lines of sh dpkg -i. I can recall exactly, I took them from another stackoverflow answer. Anyway, it seems everything is installed properly since it shows up with these commands: sudo lshw -C video fglrxinfo however the first command seems to detect hardware, not the driver per se, although the driver is probably needed to detect the hardware anyway which would indicate its properly installed. I am still not sure about that VES:PARK thing though. I'd like to know what it means.. Also, if someone happens to know a good way of testing if the gpu is connected/being used...some sort of benchmark maybe...I'd like to hear it. P.s. I can find my way around in Ubuntu but I would probably still be considered a rookie by more experienced users.

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• Can one really fry a monitor by setting the wrong HorizSync and VertRefresh?

  - by rumtscho

  I've encountered this problem on several different systems with several different monitors: a monitor functions perfectly under Windows. I install a Linux and the max resolution is at some impossibly low value, mostly 640x480, changing it in Xorg.conf doesn't work. The X.org log file then shows that the driver cannot determine the correct refresh rate for the monitor, so it ignores everything in Xorg.conf and just loads in some default minimalistic mode. Googling the problem leads to an easy solution: set the HorizSync and VertRefresh in Xorg.conf, and everything works. The problem seems to be a common one, and I've seen dozens of results recommending the solution. Each of them contains the warning that you should use the value ranges provided with the monitor. Because if you don't, and your video card sends a signal with the wrong refresh rate, this can damage your monitor. Of course, you don't have a user manual for your monitor any more. If you are lucky to find one on the attic or on the net, it doesn't contain any information about the supported refresh rate. So you just type in the value suggested in the solution description, which varies wildly depending on your source, and cross your fingers. You restart, and... ... you've set the wrong values. So the monitor shows a short message like "input signal out of range", and you do a hard restart, repair your Xorg.conf in recovery mode, and everything is fine, including your monitor. So does this warning reflect a real possibility, or is it just a geeky urban legend? Or is it something which used to happen in the past, before manufacturers started protecting the monitors against it? Is it technically possible with every monitor technology, or is it maybe something which can only happen to a CRT? If you think that it's true, why? Have you ever witnessed a monitor die from the wrong refresh config, or have you read of it in a reputable source?

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• My desktop has started overheating -- how hot is hot?

  - by Jerry

  I have a two year old desktop, some random quad core HP desktop. It used to run very quietly, but in the past month, the fans start up anytime anything "serious" is being done -- compiles, playing video, etc. Right now, speedfan and speccy report the cores are between 50C and 70C. Speedfan reports this as hot. (Nice flame icon.) Well, the system does sit on my carpet, so two weeks ago, I took off the lid, and cough *cough* it was pretty filled with dust. I got out an air can, turned on a vacuum and carefully got out all the dust that I saw on the CPU fan the case fans any fan I saw (graphics board) and blew out all the dust I could from all the circuit boards. And then I closed the case back up. It has definitely run cooler since then, but it still runs hot, and I hear high speed fan noise I never heard before. How hot is too hot? At what temps do consumer grade CPUs die? What should I be looking to do? Replace CPU fan? (It seems to work) Replace power supply fan? Assuming the dust problem is gone, where should I be looking to determine why the machine is heating up? Epilogue: After following the various pieces of advice given here, the system did run cooler, but it was still noticeably running louder (hotter) than just a few months prior. I ended up purchasing a new cpu heatsink and fan and during installation found the cooling grease from the original heatsink was just a dried, cracked layer, probably more of an insulator than heat transfer agent. With the new fan AND the new heatsink compound, the system ran much much cooler and the fan rarely turns on.

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• Can I have damaged a CPU ?

  - by Pascal

  Hey guys, This is a question I asked on Anantech forums, but I just discovered this community and think this question would fit right in. Here goes: I built a PC around a Q9550 1 1/2 years ago (MoBo is an Asus P5Q deluxe). Specs give 2.83GHz, OC'ed it to 3.40 GHZ without any problem (or so I thought) till 2 months ago. Cooling is provided by stock Intel Fan... 2 Months ago, I began to see random crashes, bios saying CPU overheat error... PC would reboot at OC'ed speed without any problem. Since last saturday and a few more crashes, PC won't reboot at 3.40 GHz, and even at stock speed (2.83 GHz), I got core temperatures of (60 C idle, 95 C under load) on the first two cores. This is the 4 core temperatures I am talking about, not the T-CPU which obvioulsy is lower. Fan is running at a steady 2000 RPM. Questions for you : 1. Is 2000 RPM the normal speed of the Intel fan or is my fan somehow broken (which could explain the overheating). In this case, any recommendation for a good fan for OCing ? 2. Hypothesis I fear is the right one: can the CPU have been slowly damaged over time by this OCing, meaning there is nothing much to do except waiting for it to die ? (As a side note, I am surprised that the 9550 is still around 300 $CDN here... Thought it would have been cheaper with all those i3/i5/i7 around). Any help or advice would be more than welcome...

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• OSX 10.6 goes unresponsive

  - by mjb

  This behavior continues to perplex me. My MBP, running 10.6.7, stops responding to all Apple-based software. Whatever software I have open remains open (Terminal, iTunes, Safari), but if I try to use the F-shortcuts or launch any OSX-based software not already open (System Preferences for example) it just bounces in the dock then never launches. I also cannot reboot without hard rebooting. I left terminal open, so I see the following in /var/log/system.log Jun 25 19:39:02 mjb-2 com.apple.ReportCrash.Root[59432]: 2011-06-25 19:39:02.585 ReportCrash[59432:7f1f] Saved crash report for CoreServicesUIAgent[59576] version ??? (???) to /Library/Logs/DiagnosticReports/CoreServicesUIAgent_2011-06-25-193902_localhost.crash Jun 25 19:39:02 mjb-2 com.apple.ReportCrash.Root[59432]: 2011-06-25 19:39:02.586 ReportCrash[59432:b10f] Saved crash report for quicklookd[59571] version ??? (???) to /Library/Logs/DiagnosticReports/quicklookd_2011-06-25-193902_localhost.crash Two requests: (1) please don't send this off to the Apple area so it can die a slow painful rotting death of tumbleweed. (2) Suggest what I should kill -9 or logs to look at to cut this sh*$ out. Cheers, mjb

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• How to diagnose occasional sudden resets?

  - by steve314

  I have a Windows XP system, and have recently upgraded by adding 2 1GB sticks of RAM to the 2x0.5GB already present. Since then, about once per day (the system is used 8+ hours per day), the system has suddenly and unexpectedly reset. On a couple of occasions, the system has frozen completely, only responding to the power button being held in for several seconds to force power off. Nothing at all ever appears in the system event log that might indicate a possible cause - everything seems to suggest business as usual. Sounds like faulty memory - but memtest86+ says otherwise. A full test, taking over an hour, found no issues. The next likely suspicion, then, is that I've knocked something while installing the RAM. Trouble is, everything I can think of to test seems fine. I've opened up the case and prodded a few things around, hoping to get better contact on connections etc, but there's no sign yet as to whether that has made a difference or not. I thought about a malware-related timing fluke, but again, so far as I can tell I'm all clear. All I can think of to add to my checklist (mainly of things that I can't easily check) is... The power supply is (1) only 350W, (2) not necessarily the best quality, and (3) powering a Prescott P4 640 3.2GHz. Could that be borderline overloaded or about to die? How do I check? Is it possible that the CPU isn't getting cooled properly? I haven't had the fan past normal tickover even doing video encoding, and the only sane temperature reading from SpeedFan is pretty steady at 36 celcius, so probably not. Any thoughts? Is there a standard procedure for diagnosing this kind of fault?

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• Cable management techniques

  - by cornjuliox

  How do you manage the giant jungle of cables behind your PC? When you have 2 or more PCs next to each other, you wind up with this giant mess cables that's a pain in the neck to clean especially when both computers are running 24/7 and any fidgeting with the cables is likely to cause data loss and/or angry users. So far I've tried masking tape, cable ties and plain old string but none have been very effective. The masking tape kept the cables in place, but over time they ended up leaving this awful sticky residue on the sides of the cables that just won't come off gets all over your fingers and is horrible horrible horrible. I have nightmares about that stuff. We used cable ties and 'folded' up some of the longer cables so that they weren't any longer than they needed to be, but this meant that the position of some of our devices like the keyboard and the mouse were essentially 'fixed' until we removed the ties. The string didn't work much differently and required that we tie them properly or risk it coming loose. I would switch to a wireless keyboard and mouse, but I don't want to have to deal with the added expense of batteries, even the rechargable ones. Plus I don't want them to die on me at a crucial moment (happened to me once while playing Firearms _<). How do large offices and data centers manage their masses of cable?

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• Cable management techniques

  - by cornjuliox

  How do you manage the giant jungle of cables behind your PC? When you have 2 or more PCs next to each other, you wind up with this giant mess cables that's a pain in the neck to clean especially when both computers are running 24/7 and any fidgeting with the cables is likely to cause data loss and/or angry users. So far I've tried masking tape, cable ties and plain old string but none have been very effective. The masking tape kept the cables in place, but over time they ended up leaving this awful sticky residue on the sides of the cables that just won't come off gets all over your fingers and is horrible horrible horrible. I have nightmares about that stuff. We used cable ties and 'folded' up some of the longer cables so that they weren't any longer than they needed to be, but this meant that the position of some of our devices like the keyboard and the mouse were essentially 'fixed' until we removed the ties. The string didn't work much differently and required that we tie them properly or risk it coming loose. I would switch to a wireless keyboard and mouse, but I don't want to have to deal with the added expense of batteries, even the rechargable ones. Plus I don't want them to die on me at a crucial moment (happened to me once while playing Firearms _<). I know that there are people out there with home/office networks a thousand times more convoluted than mine, so

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• My linux server "Number of processes created" and "Context switches" are growing incredibly fast

  - by Jorge Fuentes González

  I have a strange behaviour in my server :-/. Is a OpenVZ VPS (I think is OpenVZ, because /proc/user_beancounters exists and df -h returns /dev/simfs drive. Also ifconfig returns venet0). When I do cat /proc/stat, I can see how each second about 50-100 processes are created and happens about 800k-1200k context switches! All that info is with the server completely idle, no traffic nor programs running. Top shows 0 load average and 100% idle CPU. I've closed all non-needed services (httpd, mysqld, sendmail, nagios, named...) and the problem still happens. I do ps -ALf each second too and I don't see any changes, only a new ps process is created each time and the PID is just the same as before + 1, so new processes are not created, so I thought that process growing in cat /proc/stat must be threads (Yes, seems that processes in /proc/stat counts threads creation too as this states: http://webcache.googleusercontent.com/search?q=cache:8NLgzKEzHQQJ:www.linuxhowtos.org/System/procstat.htm&hl=es&tbo=d&gl=es&strip=1). I've changed to /proc dir and done cat [PID]\status with all PIDs listed with ls (Including kernel ones) and in any process voluntary_ctxt_switches nor nonvoluntary_ctxt_switches are growing at the same speed as cat /proc/stat does (just a few tens/second), Threads keeps the same also. I've done strace -p PID to all process too so I can see if any process is crating threads or something but the only process that has a bit of movement is ssh and that movement is read/write operations because of the data is sending to my terminal. After that, I've done vmstat -s and saw that forks is growing at the same speed processes in /proc/stat does. As http://linux.die.net/man/2/fork says, each fork() creates a new PID but my server PID is not growing! The last thing I can think of is that all process data that proc/stat and vmstat -s show is shared with all the other VPS stored in the same machine, but I don't know if that is correct... If someone can throw some light on this I would be really grateful.

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• Sparing level on HP EVA 4000

  - by Samuel

  One of the disks of our EVA4000 died today. This diskgroup (all volumes vraid5 with sparing level 1 and almost no space left for more volumes, 1TiB drives) is being rebuilt with "spare space" right now, and it will take at least 15 hours to do the leveling/rebuilding. We can't get a new disk until Friday. So, the question is, what would happen if another disk dies before the leveling completes? Would we lose data? And after that, how many aditional disks could die before losing data? 1 or 2? In "usual" RAID, we would be vulnerable to data loss while the rebuild takes place, but in this case the space reserved for sparing is two times the size of the bigger disk, so at the very least the effect should be the same of having two spares. Thanks in advance. Update: I have found some interesting threads about this question but still can't answer to this question, so I'm starting a bounty. http://blog.thestoragearchitect.com/2008/10/27/understanding-eva/ http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&url=http%3A%2F%2Fwww.experts-exchange.com%2FStorage%2FStorage_Technology%2FQ_25548177.html (Expert Exchange question from google).

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• Blocking an IP from connecting

  - by Sam W.

  I have a problem with my Apache webserver where there's and IP than connecting to my server, using alot of connection and wont die which eventually making my webserver timeout. The connection will stay as SYN_SENT state if I check using netstat -netapu I even flush my iptables and use the basic rules and it still doesn't work. The IP will get connected when I start my Apache Basic rules that I use: iptables -A INPUT -i lo -j ACCEPT iptables -A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT iptables -A INPUT -s 89.149.244.117 -j REJECT iptables -A OUTPUT -s 89.149.244.117 -j REJECT iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A OUTPUT -j ACCEPT iptables -A INPUT -p tcp --dport 80 -j ACCEPT iptables -A INPUT -p tcp --dport 443 -j ACCEPT iptables -A INPUT -p tcp --dport 21 -j ACCEPT iptables -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT iptables -A INPUT -j REJECT iptables -A FORWARD -j REJECT The bold part is rule in question. Not sure this is related but tcp_syncookies value is 1. Can someone point out my mistake? Is there a way to block it for good. Thank you

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• PHP cannot connect to MySQL

  - by yogal

  Hello, I recently installed Apache 2 + PHP 5.3.1 + MySQL 5.1.44 on my Windows 7 64bit machine following this guide: http://sleeplessgeek.blogspot.com/2010/01/setting-up-apache-php-mysql-phpmyadmin.html It all went fine, php is working great (even with XDebug) but I cannot connect to mysql server. A simple script I wrote to test connection (yes, root has no pass): $username = "root"; $password = ""; $database = "test"; $hostname = "localhost"; $conn = mysql_connect($hostname, $username, $password) or die("Unable to connect to MySQL Database!!"); It prints this error after 60sec of timeout: Warning: mysql_connect() [function.mysql-connect]: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. I can connect to mysql using cmdmysql -h localhost -u root Services are working properly. There also seems to be a problem with PhpMyAdmin (using 3.2.5). As soon as I type user and pass the page loads and turns blank (content-lenght in headers is 0 but status code is 302 Found). Looks like something wrong with cookies (my auth method). I hope someone has a clue, it has to be something dumb simple I missed. Thanks in advance.

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• MySQL extension of PHP not working

  - by Víctor

  In a Debian server, and after intallation and removal of SquirrelMail (with some downgrade and upgrade of php5, mysql...) the MySQL extension of PHP has stopped working. I have php5-mysql installed, and when I try to connect to a database through php-cli, i connect successfully, but when I try to connect from a web served by Apache I cannot connect. This script, run by php5-cli: echo phpinfo(); $link = mysql_connect('localhost', 'user, 'password'); if (!$link) { die('Could not connect: ' . mysql_error()); } echo 'Connected successfully'; mysql_close($link); Prints the phpinfo, which includes "/etc/php5/cli/conf.d/mysql.ini", and also the MySQL section with all the configuration: SOCKET, LIBS... And then it prints "Connectes successfully". But when run by apache accessed by web browser, it displays the phpinfo, which includes "/etc/php5/apache2/conf.d/mysql.ini", but has the MySQL section missing, and the script dies printing "Fatal error: Call to undefined function mysql_connect()". Note that both "/etc/php5/cli/conf.d/mysql.ini" and "/etc/php5/apache2/conf.d/mysql.ini" are in fact the same configuration, because I have in debian the structure: /etc/php5/apache2 /etc/php5/cgi /etc/php5/cli /etc/php5/conf.d And both point at the same directory: /etc/php5/apache2/conf.d -> ../conf.d /etc/php5/cli -> ../conf.d Where /etc/php5/conf.d/mysql.ini consists of one line: extension=mysql.so So my question is: why is the MySQL extension for PHP not working if I have the configuration included just in the same way as in php-cli, which is working? Thanks a lot!

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• Running $ORIGIN linked binaries from setuid scripts on linux

  - by drscroogemcduck

  I'm using suidperl to run some programs that require root permissions. however, the runtime linker won't expand library paths which contain $ORIGIN entries so the programs i want to run (jstack from java) won't run. more info here There is one exception to the advice to make heavy use of $ORIGIN. The runtime linker will not expand tokens like $ORIGIN for secure (setuid) applications. This should not be a problem in the vast majority of cases. my program looks something like this: #!/usr/bin/perl $ENV{PATH} = "/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/java/jdk1.6.0_12/bin:/root/bin"; $ENV{JAVA_HOME} = "/usr/java/jdk1.6.0_12"; open(FILE, '/var/run/kil.pid'); $pid = <FILE>; close(FILE); chomp($pid); if ($pid =~ /^(\d+)/) { $pid = $1; } else { die 'nopid'; } system( "/usr/java/jdk1.6.0_12/bin/jstack", "$pid"); is there any way to fork off a child process in a way so that the linker will work correctly.

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• Windows authentication to SQL Server via IIS and PHP

  - by Jeff

  We're running a PHP 5.4 application on Server 2008 R2. We would like to connect to a SQL Server 2008 database, on a separate server, using Windows authentication (must be Windows authentication--the DB admins won't let us connect any other way). I have downloaded the SQL Server drivers for PHP and installed them. IIS is configured for Windows authentication, and anonymous authentication has been disabled. $_SERVER['AUTH_USER'] reports our currently logged on Windows account. In php.ini, we have set fastcgi.impersonate = 1. When we setup a connection using the following code from Microsoft: $serverName = "sqlserver\sqlserver"; $connectionInfo = array( "Database"=>"some_db"); /* Connect using Windows Authentication. */ $conn = sqlsrv_connect( $serverName, $connectionInfo); if( $conn === false ) { echo "Unable to connect.</br>"; die( print_r( sqlsrv_errors(), true)); } We are presented with the following error message: Unable to connect. Array ( [0] => Array ( [0] => 28000 [SQLSTATE] => 28000 [1] => 18456 [code] => 18456 [2] => [Microsoft][SQL Server Native Client 11.0][SQL Server]Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'. [message] => [Microsoft][SQL Server Native Client 11.0][SQL Server]Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'. ) Is it possible to connect to SQL Server 2008 via PHP using Windows authentication? Are there any additional required settings we need to make on IIS, SQL Server, or any other component (like a domain controller)?

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• SSH session becomes unresponsive when logged into Ubuntu Server virtual machine using VirtualBox

  - by nickbart

  Hi everyone, I'm really at my wits end here, so I'm hoping someone here can help me. I have a virtual machine running Ubuntu Server 9.10. It's just a small development environment so I can keep my code separate from the test and production environments. I am running it through VirtualBox 3.1.6 on a laptop running Ubuntu Desktop 9.10. I have it set up with a bridged network connection and it is bridged to my laptop's wireless adapter. We have no wired connections in this office. I boot up the VM and everything is fine. I can SSH into it using gnome-terminal and for a while everything is Kosher. Then seemingly randomly, the SSH terminal session with hang. No error message, nothing; it just becomes unresponsive. If I go to the VirtualBox terminal I find the VM itself is perfectly fine. It can ping and I can SSH out with it. If I restart the networking on the VM the SSH session in my gnome-terminal will most of the time become responsive again. Here's an interesting point, the SSH session will sometimes die right in the middle of me typing something (this points to it not being an idle session issue) and if I go to the VirtualBox terminal and restart the networking and then return to my gnome-terminal SSH session I find that it will come back to life and what I typed when the session hung originally will magically type itself in to the buffer. So, my input is getting stored somewhere and just can't make its way to the VM until the networking on the VM is restarted. I've tried different versions of VirtualBox and used vmdk images and vdi images and nothing seems to work. I can't tell if the problem is with my laptop, VirtualBox, or the Ubuntu Server VDI. Is there anyway to debug this issue? Or has anyone out there seen anything similar? Your help is much appreciated. Nick

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• hp DL380 G4 won't boot with disk plugged into front USB

  - by Kev

  We outgrew a few older external USB backup drives, and purchased WD My Passport 1 TB USB 3.0 drives to replace them. When they are plugged into the front of our G4, it will blink forever after the BIOS (which is current, BTW) and never boot, even though the USB disks are not "bootable" per se. Our old drives did not exhibit this behaviour (so I don't think it's this type of issue that I've read about other servers.) The old drives were USB 2.0, but this shouldn't make a difference, AFAICT--the specs say all of the G4's USB ports are the same, 2.0, anyway, so I'm not sure how one port would handle a USB 3.0 device better than another. If we plug the new drives in one of the back slots, it boots fine. What's the cause? My concern is that the front USB port, and possibly the motherboard, might be starting to die. (We are experiencing other strange issues with them, or were initially, like intermittent file permissions errors despite wide-open ACL on these local drives, but some serverfault users have me convinced they may be coincidental software/security related issues.)

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