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• Apache2 process stuck at 100% cpu, CLOSE_WAIT socket lingering

  - by mmazing

  I've troubleshooted the heck out of this today, and I can't seem to find any information on how to determine what is happening exactly. Basically, on my development server, another developer is causing CLOSE_WAIT connections that eat up one or more apache2 processes for several hours if I don't restart apache2. strace on any of the processes yields no information, only that it was able to attach. mod_proxy is not enabled. KeepAlive is on, KeepAliveTimeout is 15 seconds, MaxKeepAliveRequests is 100. From what I've been reading, this may or may not be an apache issue at all, just that that's how CLOSE_WAIT works (the server is waiting for a FIN packet to close the connection). I just can't believe that a server would be crippled so easily by not receiving a packet from a remote host telling it to close the connection. Especially without any intervention for well over an hour. Any tips? I'm about to pull my hair out. Edit : Also, there are no unusual entries in any apache log files. Edit 2: lsof -i shows only a single CLOSE_WAIT per hanging process. (That's what has been bothering me about this, as most other discussions talk about many CLOSE_WAIT connections, while I only have one per process.) The nature of the code that is running (php) doesn't really lend itself to closing open connections and whatnot. I can run the same code that he is executing with the same session data, and not result in a hanging process.

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• OpenVPN bandwith restrictrictions and cpu power needed

  - by user197664

  In Open VPN is there a way to set a maximum limit of data and speed per user? Say user "reptar' is abusing the VPN and I wanted to limit his/her speeds and/or data how would one go about doing this? Would I need to know the IP address of the abuser? Also, I have seen articles around the internet about turing a Rasberry PI in to a VPN server. If I did such a thing how many users would this device be able to handle at a given time? I believe it runs at 512 gb and clocks at around 700 mhz.

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• Trying to get Hobbit clients to show cpu, mem, disk, etc

  - by Bryan Agee

  I have a Hobbit server set up with a handful of hosts using conn, http, ssh, and sslcert services, but would like to add the other tests as well. I've installed hobbit-client on a server, and added: # CLIENT:fqdn.example.com to it's host line in bb-hosts, and added: HOST=fqdn.example.com before the default configuration in hobbit-clinets.cfg, but no joy. Does anyone know what else I need to do for those tests to register?

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• Optimize apache for 10K+ wordpress views a day on 2GB RAM E6500 CPU

  - by Broke artist

  I have a dedicated server with apache/php on ubuntu serving my Wordpress blog with about 10K+ pageviews a day. I have W3TC plug in installed with APC. But every now and then server stop responding or goes dead slow and i have to restart apache to get it back. Heres my config what am i doing wrong? ServerRoot "/etc/apache2" LockFile /var/lock/apache2/accept.lock PidFile ${APACHE_PID_FILE} TimeOut 40 KeepAlive on MaxKeepAliveRequests 200 KeepAliveTimeout 2 StartServers 5 MinSpareServers 5 MaxSpareServers 8 ServerLimit 80 MaxClients 80 MaxRequestsPerChild 1000 StartServers 3 MinSpareServers 3 MaxSpareServers 3 ServerLimit 80 MaxClients 80 MaxRequestsPerChild 1000 StartServers 3 MinSpareServers 3 MaxSpareServers 3 ServerLimit 80 MaxClients 80 MaxRequestsPerChild 1000 User ${APACHE_RUN_USER} Group ${APACHE_RUN_GROUP} AccessFileName .htaccess Order allow,deny Deny from all Satisfy all DefaultType text/plain HostnameLookups Off ErrorLog /var/log/apache2/error.log LogLevel error Include /etc/apache2/mods-enabled/.load Include /etc/apache2/mods-enabled/.conf Include /etc/apache2/httpd.conf Include /etc/apache2/ports.conf LogFormat "%v:%p %h %l %u %t \"%r\" %s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined LogFormat "%h %l %u %t \"%r\" %s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %s %O" common LogFormat "%{Referer}i - %U" referer LogFormat "%{User-agent}i" agent CustomLog /var/log/apache2/other_vhosts_access.log vhost_combined Include /etc/apache2/conf.d/ Include /etc/apache2/sites-enabled/

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• Deleting large no of files on linux eats up CPU

  - by Sanjay

  I generate more than 50GB of cache files on my RHEL server (and typical file size is 200kb so no of files is huge). When I try to delete these files it takes 8-10 hours. However, the bigger issue is that the system load goes to critical for these 8-10 hours. Is there anyway where I can keep the system load under control during the deletion. I tried using nice -n19 rm -rf * but that doesn't help in system load. P.S. I asked the same question on superuser.com but didn't get a good enough answer so trying here.

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• CPU fan twitching phase leds blinking - computer won't boot

  - by SooX

  I have a big problem that I got today. Yesterday computer was "on" normally, I went to sleep without shutting it down. When I woke up, I heard a strange sound and was unable to bring it up from hibernate. I unplugged the PSU. When I plugged the PSU back in, the sound came back. When I opened the case, I saw the fan "twitching" like it is about to start and fan LEDs were blinking. Also, motherboard LEDs were blinking in the same pattern - the first green one has more of luminosity then others. When I cut down the power with 0/1 button on PSU, the fans continue to make sounds like the machine is trying to boot before the capacitors run out and the power dies. Does anyone have a clue what to do? I tried disassembling everything but that doesn't work. I will try with friend's PSU later today.

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• Gateway MX6440 CPU Upgrade

  - by BPugh

  I have received an a Gateway MX6440 laptop as a freebie, but I'm interested in upgrading its AMD Turion 64 ML-32 (socket 754) to something faster (and more cache). I know the range of processors that could work based on the family list in Wikipedia. However, this computer has the stock bios, and any updates I haven't applied from Gateway doesn't specify processor support. I'm looking to go to at least a 2.2 (ML-40). Has anybody upgraded the processor in this model or other in the series success or failure and do you happen to have any guides handy for working with the heat sink? Any Googling I have done keeps hitting RAM marketers. Update Computer died before I had a chance to try this out.

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• Home Server: cpu virtualisation, what to choose?

  - by Huygens

  I'm looking for virtualisation solutions for storage and OS for a home server. A sort of private cloud where I manage the storage space independently of the VM one. This question focus on VM (or compute instance) management and what would best suit my needs. (I have another question related to the storage management). My use cases are: A backup server: rsync and other services running. A personal cloud server: a kind of owned dropbox system, à la ownCloud. " users foreseen. A media server: streaming videos and displaying photos. Here my environement and wishes: Server: HP Proliant MicroServer with 8 GB RAM (AMD Turion dual core with AMD-V technology) OS types: only Linux (perhaps a *BSD VM in the future) Linux distributions do not matter, I'm familiar with RHEL, Fedora, Suse, Ubuntu, but any other recommandation will be fine 2-3 VMs foreseen: backup server, owncloud server and media server (optional). Those are only servers, so no graphical console needed (I don't need VirtualBox) By VM I mean a virtualised environment like KVM, Xen, etc. or a compute instance like with OpenStack storage should be "virtualised/cloudified" see my other question. VM should be able to be migrated to another server in the future if performance cannot be fullfilled anymore by the current server It does not matter if installation of such setup is complicated as long as management tools allow for easy maintenance I don't have Windows at home, so solution should be Linux friendly and would be nice to be web based. But native apps are OK too. System should be easy to enhance: by adding a new server to migate some of the VMs to it. So it's really a kind of private cloud on which I could run some Linux OS. I would prefer free (libre, as in a free speach) and open source tools. But it does not have to be free as in a free beer. So Xen, KVM, VitualBox or OpenStack? What would you recommend?

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• Running a VM on a hyperthreaded CPU

  - by gbrandt

  Is it better to run a VM on a dual core hyperthreaded machine as a four core or as a two core VM. The hyperthreaded 'virtual' cores are not as fast as the real cores. Does this effect the VM?

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• A lots of Apache processes are using my CPU uses always more than 70%

  - by Barkat Ullah

  I am running a plesk panel in 1and1. I have 120 sites running and all are using pligg cms, each site has 600 visitors per day. Please see the details of my server below: HDD-1000GB RAM-16GB Processor-6 Core I always see a lot of apache processes running in my # top view, so the server seems overloaded. If I can reduce the amount apache processes I think the server will be ok. But I don't know why too many apache processes are running. Please see the link below for the screenshot of my # top view: http://dl.dropbox.com/u/26967109/%23Top-2.jpg Sometimes I saw too many connection error in my plesk control panel, so I added the below line in my [mysqld] section: set-variable=max_connections=416 But I didn't find a solution yet. I have also added maxclients and serverlimit 416 in the config /etc/httpd/conf/httpd.conf But no solution yet. I am researching around more than 7 days but don't get any solution. Please help me to solve the problem. In peak hours my sites are taking too much time to load, but off-peak hour it is ok. Please help me to find out the actual problem.

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• Deleting large no of files on linux eats up CPU

  - by Sanjay

  I generate more than 50GB of cache files on my RHEL server (and typical file size is 200kb so no of files is huge). When I try to delete these files it takes 8-10 hours. However, the bigger issue is that the system load goes to critical for these 8-10 hours. Is there anyway where I can keep the system load under control during the deletion. I tried using nice -n19 rm -rf * but that doesn't help in system load.

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• Top cpu% analyis

  - by user111196

  I would like the know in what cpus % can be considered in save range and also load average? Which indication will give signal something is wrong with the server? top - 22:55:51 up 3 days, 6:39, 1 user, load average: 0.53, 0.43, 0.37 Tasks: 229 total, 2 running, 227 sleeping, 0 stopped, 0 zombie Cpu0 : 16.2%us, 0.7%sy, 0.0%ni, 82.8%id, 0.0%wa, 0.0%hi, 0.3%si, 0.0%st Cpu1 : 10.5%us, 0.7%sy, 0.0%ni, 88.5%id, 0.0%wa, 0.0%hi, 0.3%si, 0.0%st Cpu2 : 9.0%us, 0.0%sy, 0.0%ni, 91.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu3 : 0.3%us, 0.3%sy, 0.0%ni, 99.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu4 : 1.0%us, 0.0%sy, 0.0%ni, 99.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu5 : 44.8%us, 2.6%sy, 0.0%ni, 37.0%id, 0.0%wa, 9.4%hi, 6.2%si, 0.0%st Cpu6 : 3.0%us, 0.0%sy, 0.0%ni, 96.7%id, 0.0%wa, 0.0%hi, 0.4%si, 0.0%st Cpu7 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 16468596k total, 2423908k used, 14044688k free, 200172k buffers

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• Suggested benchmark for testing CPU footprint of antivirus software

  - by Alex Chernavsky

  Our organization is currently running Symantec Corporate Antivirus, which is rumored to be a big resource hog. I know that we do have a lot of older machines that are running slow. Our PCs are all running Windows XP Pro and are used only for business applications (mostly Microsoft Office), e-mail, and web surfing. They're not used for gaming (one would hope not, anyway). I'd like to take one of the old PCs and do a speed benchmark test while it's running Symantec AV, then another test with no antivirus, and a third test with ESET NOD32. As I said, I don't care much about graphics performance. What would be an appropriate benchmarking program program to use? Freeware is best, of course. Thank you for considering my question.

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• CPU cores and workers / maxservers

  - by user80666

  I'm trying to optimize my apache and nginx installations and have been looking for information on how to setup correct number or min/max servers and connections in Apache and worker processes in Nginx. I was wondering whether or not Apache and Nginx take advantage of multy core processors and how to set configuration in Apache and Nginx? For example, lets say I have a 4 core processor, should I set workers to 4 in nginx? what should I set spare server in apache to?

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• average temperature of CPU

  - by lego 69

  I downloaded the program named speedFan(for measuring the temperature of the hardware), and I have parameters like these GPU: 60C HDO: 38C Temp1: 50C Core 0: 44C Core 1: 44C Core: 59C Ambient: 0C I know that it shows me temperature of the different parts of my hardware, but I have no idea which ones, can You please explain it and also, is it something wrong with my laptop (because temperature of GPU is 60C) thanks in advance

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• CPU Configuration Issue for 2 Servers (Server 2008 R2)

  - by Bill Moreland

  I have 2 servers running the exact same Classic ASP code with Access DBs (yes, not ideal, but it is what it is, for now). 1) Xeon 5520 @ 2.27 GHz (6 GB Memory) 2) Xeon E5-2620 @ 2.00 GHz (2 processors, 32 GB Memory) For most pages the newer E5-2620 processes the pages between 10-15% faster. On pages requiring heavy and/or multiple complicated access stored procedures (queries) the older 5520 does a much better job. I believe the servers are configured nearly identically. My question: is it possible that the newer, multi-processor server is not as good at handling Classic ASP as the older single processor? Is there a configuration difference that needs to be in place that I'm missing since I'm shooting for identical implementations?

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• How to make one CPU to be used simulataneously be three different users

  - by beginning_steps

  As a bootstrapping start-up we are thinking of saving on the IT hardware cost by making more use of the hardware that we have. As a solopreneur I have a laptop config : intel core2duo processor, 3Gb RAM and 250 GB RAM. Now we are planning to increase our team to 3 members. Will like your suggestions on the nest cost-effective step that I can take so that I can use the computing power of the existing laptop to act as a kind of server and then buy to more monitors where the new recruits can do the daily work on and they need to have different login id and access and they dont need access to all the files/applications as are available in my laptop. We use internet intensively to do our day to day activity. Please share you experience, whether you think this is a good ploy or there is any other more effective way of achieving the same result.

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• Webserver - Memory-bound or CPU-bound? [closed]

  - by JJP

  Possible Duplicate: How do you do Load Testing and Capacity Planning for Web Sites I'm installing a social network using Zend Framework & MySql, with lots of plugins & queries. I want Webserver & Sql server on one box. I'm trying to choose between two machines (on hetzner.de): A) intel i7-2600 3.4 GHz 16 GB DDR3 RAM B) intel i7-920 2.6 GHz 24 GB DDR3 RAM B has 50% more RAM but 30% slower clock speed. Q is: is it obvious where the bottleneck will be? Would I ever need 24GB of RAM, even with lots of concurrent users?

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• Removing Little Snitch completely (Mac OS X Snow Leopard)

  - by Mathias Bynens

  I uninstalled Little Snitch months ago. Or so, I thought. When opening Console.app, I see something like this: Here’s a textual log: 21/11/09 22:05:31 com.apple.launchd[1] (at.obdev.littlesnitchd[10045]) Exited with exit code: 1 21/11/09 22:05:31 com.apple.launchd[1] (at.obdev.littlesnitchd) Throttling respawn: Will start in 10 seconds 21/11/09 22:05:33 Little Snitch UIAgent[10046] 2.0.4.385: m65968c1c 21/11/09 22:05:33 Little Snitch UIAgent[10046] 2.0.4.385: m579328b9 21/11/09 22:05:33 Little Snitch UIAgent[10046] 2.0.4.385: m41531ded 21/11/09 22:05:33 com.apple.launchd.peruser.501[170] (at.obdev.LittleSnitchUIAgent) Throttling respawn: Will start in 10 seconds 21/11/09 22:05:41 com.apple.launchd[1] (at.obdev.littlesnitchd[10049]) Exited with exit code: 1 21/11/09 22:05:41 com.apple.launchd[1] (at.obdev.littlesnitchd) Throttling respawn: Will start in 10 seconds 21/11/09 22:05:43 Little Snitch UIAgent[10050] 2.0.4.385: m65968c1c 21/11/09 22:05:43 Little Snitch UIAgent[10050] 2.0.4.385: m579328b9 21/11/09 22:05:43 Little Snitch UIAgent[10050] 2.0.4.385: m41531ded 21/11/09 22:05:43 com.apple.launchd.peruser.501[170] (at.obdev.LittleSnitchUIAgent) Throttling respawn: Will start in 10 seconds Spotlight searches for ‘little snitch’ or ‘littlesnitch’ yield no results. Yet, it seems like I didn’t get rid of Little Snitch entirely, since it’s still using up my CPU. Any ideas?

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• Why does my computer crash randomly?

  - by Donavon Decker

  The other day I went out to my van to get my Tower and when I opened the trunk it fell out. I brought it into the house and opened it, and everything looked ok. When I started it up, about 1-3 minutes afterwards it would crash. It did this over and over until I reseated the cooler. Everything seemed normal again, until after about 10 minutes of gameplay (any game), it would crash. I reseated my GPU + reinstalled the drivers, however I still get the same error. A while back, I'd check my 'Windows Rating' periodically, and all of them were in the '6.0-6.9' range except for my hard disk usage (always been like that [not relative]). Today I went in and looked, and my Processor and Memory was rated 5.4. I reseated my cpu and my memory, refreshed the windows rating, and then my processor and memory went from 5.4, to 5.1. A few minutes ago I reseated them once again, and now it's back to 5.4. Note: Not sure if this is relevant to the issue, but I updated my bios earlier today I honestly have no idea what the issue is, but I'm getting aggravated at the problem. Here are some images which contain images of my specifications: i1271.photobucket.com/albums/jj623/donxdeck/1_zps09f0607c.jpg i1271.photobucket.com/albums/jj623/donxdeck/4_zps381cd00a.jpg i1271.photobucket.com/albums/jj623/donxdeck/3_zps54bba720.jpg i1271.photobucket.com/albums/jj623/donxdeck/2_zps945d3d72.jpg Thanks for the help

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• fail2ban log parsing too slow on Raspberry Pi - options? [migrated]

  - by Gordon Morehouse

  I'm running fail2ban on a Raspberry Pi at 950MHz which I cannot overclock further. The Pi is occasionally subject to SYN floods on particular ports. I've set up iptables to throttle the rate of SYNs on the port of interest; when the throttle limits are exceeded, hosts which send SYNs are dropped into the REJECT chain and the particular SYN packet which exceeded the limit is logged. fail2ban then watches for these logged SYNs and, after seeing a few, temporarily bans the host for a short time (this is a transient issue in the app I'm working with). The problem is that the SYN floods can occasionally reach rates which are too fast for fail2ban to keep up with; I'll see 20-40 log messages per second, and eventually fail2ban falls behind and becomes ineffective. To add insult to injury, it continues consuming a LOT of CPU as it tries to catch up. I have verified that DROP chained packets from hosts already banned by fail2ban are not logged, and thus do not add to its load. What are my options here? I have a few ideas, but no clear path forward. Could I make the log-parse regex "easier" so it takes fewer cycles? Would using iptables --log-prefix to put a token near the start of the log message, and/or otherwise simplifying/altering the fail2ban regex help? Here is the current fail2ban config line containing a regex: failregex = kernel:.*?SRC=(?:::f{4,6}:)?(?P<host>[\w\-.^_]+) DST.*?SYN Is there a faster way for fail2ban to watch for the packets exceeding the limits than parsing kern.log? Could fail2ban be run under PyPy instead of CPython with minimal nonstandard wizardry (the OS is Raspbian 7, so, mostly Debian 7)? Is there something better than fail2ban that I could use to watch for the packets which exceed the SYN limits, and after N exceeds in X seconds, temporarily put the offending IP into the iptables DROP bucket, and take it out when the ban timer expires? Again, I'd vastly prefer a solution that uses as much software available in Debian as possible, though I can build Debian packages in a pinch.

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• does my machine configuration make sense?

  - by user1227914

  i couldn't think of a better place to ask this question, so here it goes. we're putting together a dedicated server for a website that will initially host the web server and the mysql database. as the website grows, we'll move the database to a different server and this machine will eventually only server the actual website. so the question is ...does my configuration look okay? it's the first time i'm building a server from scratch so i want to make sure i don't combine components that don't fit or something. things like ..do the drives i picked work for the hot swap ..etc. what do you guys think? am i good to go with this configuration? :) Chassis: Supermicro SuperServer 6016T-MTHF (6x DDR3 SDRAM - ECC DIMM 240-pin, 2x LGA1366 Socket, Power Provided: 600 Watt, 4 (free) x hot-swap - 3.5") CPU: Intel BX80614E5620 Xeon E5620 Processor - 4 Core, 2.40GHz, LGA 1366, 5.86GT/s QPI 12MB Cache, 64-Bit, 80W, HyperThreading Memory: Crucial CT51272BB1339 4GB PC10600 DDR3 Memory - 1333MHz, ECC, Registered, 1x4096MB (possibly 3 or 4 of them) Hard Drives: Western Digital WD2002FAEX Caviar Black Hard Drive - 2TB, 3.5", SATA 6Gbps, 7200 RPM, 64MB (possibly 2 or 3). thank you very much for any professional advice :)

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• Computer restarts without warning; code bcc116

  - by Robert C.

  Processor: Intel i5 4430 4-Core 4x3Ghz Motherboard: msi h87-g41 Graphics Card: Nvidia GTX760 Power supply: eps-750 cm RAM: 8GB I bought a new assembled gaming PC which worked fine for a few days. Then it started rebooting without warning. After it restarts windows 7 gives me an bbc 116 error code. Apparently it's something to do with my video card, either it overheating or wrong drivers. I've installed the latest driver from Nvidia for my graphics card. Since it's brand new it can't be dust, I'm running it with its lid open to see if the problem persists. I'm also running prime95 now to see if it tells me anything else. Using core temp it tells me that my CPU reaches up to 95° celsius with the blend stress test from prime95. Aaaand it just peaked to 100°. Of course it doesn't reach these temperatures at all while idle/gaming. I'm gonna let prime95 run for a night and to see what happens. Until then does anyone know what I should do next?

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• Linux Scheduler (not using all cores on multi-core machine) RHEL6

  - by User512

  I'm seeing strange behavior on one of my servers (running RHEL 6). There seems to be something wrong with the scheduler. Here's the test program I'm using: #include <stdio.h> #include <unistd.h> #include <stdlib.h> void RunClient(int i) { printf("Starting client %d\n", i); while (true) { } } int main(int argc, char** argv) { for (int i = 0; i < 4; ++i) { pid_t p_id = fork(); if (p_id == -1) { perror("fork"); } else if (p_id == 0) { RunClient(i); exit(0); } } return 0; } This machine has a lot more than 4 cores so we'd expect all processes to be running at 100%. When I check on top, the cpu usage varies. Sometimes it's split (100%, 33%, 33%, 33%), other times it's split (100%, 100%, 50%, 50%). When I try this test on another server of ours (running RHEL 5), there are no issues (it's 100%, 100%, 100%, 100%) as expected. What's causing this and how can I fix it? Thanks

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• 5 year old server upgrade

  - by rizzo0917

  I am looking to upgrade a server for a web app. Currently the application is running very sluggish. We've made some adjustments to mysql (that's another issue in itself) and made some adjustments so that heaviest quires get run on a copy of the database on another server was have as a backup, however this will not last that much longer and we are looking to upgrade. Currently the servers CPUs are (4) Intel(R) XEON(TM) CPU 2.00GHz, with 1 gig of ram. The database is 442.5 MiB, with about 1,743,808 records. There are two parts of the program, the one, side a, inserts and updates most of the data. Side b, reads the data and does some minor updates. Currently our biggest day for side a are 800 users (of 40,000 users all year) imputing the system. And our Side b is currently unknown, however we have a total of 1000 clients. The system is most likely going to cap out at 5000 side b clients, with about a year 300,000 side a users. The current database is 5 years old, so we can most likely expect the database to grow pretty rapidly, possibly double each year (which we can most likely archive older records if it comes to that). So with that being said, should we get a server for each side of the app, side a being the master, side b being the slave, any updates made on side b are router to side a. So the question is should i get 2 of these or 1. 2 x Intel Nehalem Xeon E5520 2.26Ghz (8 Cores) 12GB DDRIII Memory 500GB SATAII HDD 100Mbps Port Speed And Naturally I would need to have a redundant backup so it could potentially be 4 of them.

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