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  • How to serve Rails application with Passenger/Apache without domain name?

    - by grifaton
    I am trying to serve a Rails application using Passenger and Apache on a Ubuntu server. The Passenger installation instructions say I should add the following to my Apache configuration file - I assume this is /etc/apache2/httpd.conf. <VirtualHost *:80> ServerName www.yourhost.com DocumentRoot /somewhere/public # <-- be sure to point to 'public'! <Directory /somewhere/public> AllowOverride all # <-- relax Apache security settings Options -MultiViews # <-- MultiViews must be turned off </Directory> </VirtualHost> However, I do not yet have a domain pointing at my server, so I'm not sure what I should put for the ServerName parameter. I have tried the IP address, but when I do that, restarting Apache gives apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName [Sun Jan 17 12:49:26 2010] [error] VirtualHost *:80 -- mixing * ports and non-* ports with a NameVirtualHost address is not supported, proceeding with undefined results apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName [Sun Jan 17 12:49:36 2010] [error] VirtualHost *:80 -- mixing * ports and non-* ports with a NameVirtualHost address is not supported, proceeding with undefined results and pointing the browser at the IP address gives a 500 Internal Server Error. The closest I have got to something sensible is with <VirtualHost efate:80> ServerName efate DocumentRoot /root/jpf/public <Directory /root/jpf/public> AllowOverride all Options -MultiViews </Directory> </VirtualHost> where "efate" is my server's host name. But now pointing my browser at the server's IP address just gives a page saying "It works!" - presumably this is a default page, but I'm not sure where this is being served from. I might be wrong in thinking that the reason I have been unable to get this to work is related to not having a domain name. This is the first time I have used Apache directly - any help would be most gratefully received!

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  • CouchDB Errors: "undefined symbol: js_fgets" on Ubuntu 10.04

    - by MattEzell
    Hello, ServerFault Community. I have been wrestling with this problem for weeks without resolution and was hoping that someone here might be able to help. As indicated above, this is in Ubuntu 10.04 (x86) using CouchDB 0.11.0. I have build and installed CouchDB 0.11.0 from source. Everything with the dependencies and with the CouchDB install itself 'goes off without a hitch' - no errors or complaints in the configure, make or install... CouchDB seems to be running 'fine'. I can access Futon without issue and utilize all CouchDB functionality found in Futon... Unfortunately, when I attempt to use any shows/views for an installed Couch App, I get the above js_fgets error before terminal (and the Couch log) fills up with TONS of JSON. Nothing ever renders in the browser, though Firebugs reports. I have used the official instructions (paying special attention to the 10.04 instructions) and have followed pretty much every Google thread that I can find on similar issues. I have chase SpiderMonkey (and Rhino) as well as Erlang as the culprit, but despite reinstalls and tests with these components, I still cannot get past this CouchDB issue on my system... Ideas? Pointers? Suggestions? Has anyone successfully installed and used CouchDB 0.11.0 on an Ubuntu 10.04 system to RUN APPLICATIONS? I have come across multiple individuals who immediately respond 'yes, I have it installed - it works great' only to have them realize in the end (as I did) that just because Futon thinks things are working, doesn't mean CouchDB is properly handling ALL requests. Thank you for your time and assistance!

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  • How to configure router to give XBox top priority / most bandwidth?

    - by MrSparky
    Hi all - Newbie here so go easy... and apologies in advance if I blow the community etiquette / rules! Here's what I'm trying to do: I have a "D-Link DIR-655 Extreme N" wireless router and an XBox 360 w/ the old-style wireless connection thing (usb attachment)... I want to configure my router / network to give my XBox as much bandwidth as it wants, whenever it wants. I have tried giving the XBox a unique IP (within my network) and then tweaking the router to treat that IP as a top priority application (using the router's QOS stuff). Problem is whenever I turn off the xbox, I can't connect to the network the next time I start it up. It seems the only reliable setting in the XBox is to use "Automatic" for the IP settings within the Network Configuration area. Supposedly the D-Link ships with default settings that attempt to recognize a game console and give it top priority... but i've not seen good results (lots of stuttering / lag when someone else jumps online, etc). Any suggestions? thanks again!

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  • Slow network file transfer (under 20KB/s) on newly built x64 Win7

    - by Mangoshake
    I am getting <20KB/s for local network file transfer. If I transfer a very small file (less than 100KB) it would start quickly then slow down to <20KB/s. all subsequently network file transfer would be slow, a reboot is needed to reset this. If I transfer a large file it would be stuck on calculating for a long time and then begin with <20KB/s immediately. This is a newly built desktop running Windows 7 x64 SP1. Realtek gigabit LAN from the motherboard (ASRock Extreme3 gen3). Problematic speed is observed on the private LAN, both through ethernet and WiFi. The Router is D-Link DIR-655. Remote Differential Compression is off. Drivers are up-to-date from ASRock's website. I have tested network file transfer to and from another Windows 7 laptop and a MacBook Pro, so I am fairly certain it is the desktop's problem. The slow speed only happens with one direction also, outbound from the desktop, regardless of whether I initiate the file transfer action from the origin or the destination. Inbound network file transfer and internet speeds are fine, so I don't think this is a hardware issue. I am getting 74.8MB/s internet upload speed from speedtest.net (http://www.speedtest.net/result/1852752479.png). Inbound network file transfer I can get around 10-15MB/s. I am hoping this community has some insight for me to troubleshoot this. I don't see anything obviously related from the Event Viewer, and beyond that I just don't know where else to look. Any suggestions are greatly appreciated, thank you in advance.

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  • Fresh Proxmox VE 2.1 installation with defaults can't be reached or pinged

    - by Damainman
    I am using the lastest Proxmox VE 2.1. My server has two NICS with a uplink only connected into eth0. My Server is a co-located server utilizing public IPv4 IPs. It is not behind a firewall or any system which monitors traffic. Via IPKVM I did a fresh install of Proxmox, I put in the correct IP, Mask, Gateway, and DNS information. The install went perfectly fine with no errors. Upon completion and rebooting the system: I am unable to reach the web GUI via the browser, it just times out. I am unable to ping the server. I am unable to ping outside to the Internet from within the server. Tried pinging out to 4.2.2.2 and yahoo.com I tried rebooting the server and restarting the network service. IFCONFIG shows my IP information under vmbro0 which also has the same MAC address as the eth0 device. eth0 only displays a IPv6 Scope:Link address, which I did not setup myself. This is my first time installing proxmox, but after searching for a few hours it doesn't seem like anyone else is having the same issue as me from a fresh install with just the defaults. So far the only thing I did was install it. Also, I know the network cable is good and the IP is good because I was running a Xen XCP server with the same network settings prior to wiping it to install proxmox. Some additional information: for pveversion -v (Installed proxmox-ve_2.1-f9b0f63a-26.iso) pve-manager: 2.1-1 (pve-manager/2.1/f9b0f63a) running kernel: 2.6.32-11-pve proxmox-ve-2.6.32: 2.0-66 netstat -nr (note: .136 is my network, and .137 is my gateway) Destination - Gateway - Genmask xxx.xxx.xxx.136 - 0.0.0.0 - 255.255.255.248 0.0.0.0 - xxx.xxx.xxx.137 - 0.0.0.0 /etc/network/interfaces auto lo iface lo inet loopback auto vmbr0 iface vmbr0 inet static address xxx.xxx.xxx.138 netmask 255.255.255.248 gateway xxx.xxx.xxx.137 bridge_ports eth0 bridge_stp off bridge_fd 0

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  • Ubuntu 13.04 to 13.10: Filesystem check or mount failed [migrated]

    - by SamHuckaby
    I attempted to upgrade from Ubuntu 13.04 to 13.10 today, and mid upgrade the system started flaking out, and eventually locked up entirely. I was forced to restart the computer, and am now unable to get the computer to boot up at all. When I boot currently, it takes me to the GRUB menu, and I can choose to boot normally, or boot in an older version. I have tried several things, which I list below, but no matter what, when I try to finish booting into Ubuntu, I receive the following error: Filesystem check or mount failed. A maintenance shell will now be started. CONTROL-D will terminate this shell and continue booting after re-trying filesystems. Any further errors will be ignored root@ubuntu-computername:~# I have fun fsck -f and everything appears correct, no errors are reported. and it passes all 5 checks. If I run fdisk -l then I get the following information: Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 4096 bytes / 4096 bytes Disk identifier: 0x00010824 Device Boot Start End Blocks Id System /dev/sda1 * 2048 608456703 304227328 83 Linux /dev/sda2 608458750 625141759 8341505 5 Extended Partition 2 does not start on physical sector boundary. /dev/sda5 608458752 625141759 8341504 82 Linux swap / Solaris Disk /dev/sdb: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x0fb4b7e8 Device Boot Start End Blocks Id System /dev/sdb1 8192 625139711 312565760 7 HPFS/NTFS/exFAT I am considering just installing a new OS on the other disk, that currently has nothing on it, and then just attempting to scrape my data off the old disk (thankfully I didn't encrypt the files). Really my question is this: Can I salvage this Ubuntu install, or should I give up and just reinstall?

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  • Does AMD Cool n Quiet Slow Down Your System?

    - by Software Monkey
    I discovered today that having AMD Cool n Quiet enabled in my BIOS appears to be slowing down my Windows XP SP2 system by about 29% on memory & CPU intensive workloads. I was wondering if (a) anyone else had encountered this, (b) anyone can offer an explanation, (c) there are any negatives I need to be aware of if I keep AMD CnQ disabled. With some superficial testing so far, I don't immediately notice any difference with CnQ off (other than the performance being what I expected from this new hardware). It seems to ramp up the CPU fan a little bit as my program maxes out 1 core, but that's the same as with CnQ on. And when I let the system idle the CPU fan slows down and the systems as quiet as a mouse (after years of 6 small fans churning like they want to go into orbit it's nice to again have a system where I can hear the HDDs seeking). Bonus question: Does CnQ cause issues with system stability? I ask because the reason I disabled it was because I have had a few freezes and 1 spontaneous reboot with my new hardware.

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  • Is it possible to stop the "Beep" device on all computers in a Windows network?

    - by sharptooth
    On Windows the default behavior it to make an annoying "beep" sound every time Windows things something notable happened. The result is that when someone send a company-wide email via the MS Exchange all computers around my cubicle beep one by one. This is annoying and makes no sense. Luckily beeping can be shut off. Someone has to: open the "Device Manager", select "View - Show hidden devices", find the "Beep" device in "Non-Pug and Play Devices" node, open its properties, go to the "Driver" tab, set "startup type" to "Disabled" and click "Stop". The "Beep" device will stop and no longer produce the useless sound. This solution however requires tracking every computer and then talking to its user which is not very convenient. Device Manager doesn't allow stopping a device on another computer. I'm looking for a solution that can be deployed by the administrators team. We have a domain and the administrators even install the programs company-wide automatically. Are there any means to stop the "Beep" device an all computers in the Windows network with some remote-administration features automatically?

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  • Apache LDAP auth: denied all time

    - by Dmytro
    There is my config (httpd 2.4): <AuthnProviderAlias ldap zzzldap> LDAPReferrals Off AuthLDAPURL "ldaps://ldap.zzz.com:636/o=zzz.com?uid?sub?(objectClass=*)" AuthLDAPBindDN "uid=zzz,ou=Applications,o=zzz.com" AuthLDAPBindPassword "zzz" </AuthnProviderAlias> <Location /svn> DAV svn SVNParentPath /DATA/svn AuthType Basic AuthName "Subversion repositories" SSLRequireSSL AuthBasicProvider zzzldap <RequireAll> Require valid-user Require ldap-attribute employeeNumber=12345 Require ldap-group cn=yyy,ou=Groups,o=zzz.com </RequireAll> </Location> The Require valid-user is work. But ldap-attribite, ldap-filter, ldap-group does not work - denied in logs all time. I spent a lot of time but can't understand what's going on. This is the example of my logs: [Tue Sep 25 16:42:26.772006 2012] [authz_core:debug] [pid 23087:tid 139684003014400] mod_authz_core.c(802): [client 1.1.1.1:52624] AH01626: authorization result of Require valid-user : granted [Tue Sep 25 16:42:26.772014 2012] [authz_core:debug] [pid 23087:tid 139684003014400] mod_authz_core.c(802): [client 1.1.1.1:52624] AH01626: authorization result of Require ldap-attribute employeeNumber=12345: denied I checked all info with ldapsearch: there is a valid username, employee ID and other...

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  • Adding a Second Wireless Router to an Existing Wired Network

    - by KVCrawford
    I apologize ahead of time, I know this has been asked before, but I'm still having problems...maybe you guys can help. I started out with the basic instructions from the highest-voted answer at http://serverfault.com/questions/41572/adding-a-second-wireless-router-to-my-network The new Wireless router in question is a Linksys Wireless-N Gigabit Router, Model # WRT310N Here are the steps I've taken in setting it up: Plug my laptop into LAN port #2 in the new router. Nothing else is connected at this point Configure the new router to be 192.168.1.200 (the original router is 192.168.1.1, and its DHCP clients are from 192.168.1.100-x.x.x.199) Set the internet connection on the new router to "DHCP Client" Turn off the DHCP server & NAT routing on the new router Plug in a LAN cable from the original router into the LAN port #1 on the new router (NOT the WAN port, nothing is plugged in there) Reset the new router Afterwards, I try to ping 192.168.1.1 from the laptop plugged into LAN port #2 on the new router, with no response. 192.168.1.200 garners no response either. Typing "ipconfig" tells me: Autoconfiguration IP Address: 169.254.198.113 Subnet Mask: 255.255.0.0 Default Gateway: 169.254.198.113 What's going wrong? I appreciate any help!

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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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  • Debugging "clogged" TCP connections

    - by Nikratio
    I'm having trouble with an internet connection that seems to randomly "freeze" arbitrary tcp connections. The connections stay established, but no data is coming through. When this happens, netstat still shows the connection status as ESTABLISHED on both the local computer: Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name Timer tcp 0 53 192.168.0.10:41129 173.255.235.238:143 ESTABLISHED 8219/gnutls-cli on (79.31/13/0) ..and the remote server: Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name Timer tcp 0 0 173.255.235.238:143 68.5.174.98:41129 ESTABLISHED 5303/imapd off (0.00/0/0) However, it seems that no data at all is transferred. If I run strace on the local and remote process, both just show a repeating sequence of select calls (with different fds of course), e.g. select(6, [0 5], NULL, NULL, {0, 50000}) = 0 (Timeout) select(6, [0 5], NULL, NULL, {0, 50000}) = 0 (Timeout) select(6, [0 5], NULL, NULL, {0, 50000}) = 0 (Timeout) The internet connection overall does not seem affected, I can still establish new connections to the same service on the same server without any problems. However, the affected local applications seem to be unaware of the problem and just hang. When I look at a packet capture of this connection on the client side, the last thing that happens is that the client transmits some data, then nothing happens for about 1100 seconds, and then several TCP Retransmission requests go out, with intervals increasing from 4 seconds to 130 seconds. No activity is captured after that. After about 10 minutes, the connection on the remote end disappears from the netstat (I wasn't able to catch any intermediate state), but still stays ESTABLISHED on the local end. Finally, after some more minutes, the local application aborts with a timeout and disappears from the local netstat output as well. Does anyone have a suggestion of how I could debug this further to find out where the problem lies and how to fix it? Additionaly and/or as a temporary workaround: is is there some way to globally reduce the timeout on client and/or server to reduce the time before the local application aborts?

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  • Why do most songs in my media collection play twice? - Corrupt media?

    - by Dean
    Problem: Whether I'm playing the media with Rhythmbox on Ubuntu, Winamp on Windows, or my Nokia N95's media player, most of my audio files (OK, maybe only 40%) play twice. Info: I have a 500GB external 2.5" WD HDD, with a 150GB primary FAT32 partition labeled MUSIC. Inside this, I have about 500 folders containing about 10,000 MP3/WMA/M4A/WAV files. I manage the drive using Ubuntu 9.10, and frequently copy data to/from it using RSYNC, or on windows, TotalCopy. The visual output is different in each media player, but it behaves as if the 1 MP3 has the same song on it twice, and as soon as it ends it begins again. Winamp shows that the song goes for 2x as long as it should, The N95's media player shows the progress bar off the right-hand-side of the screen when it begins playing (then jumps back to the left, then continues along...). Rhythmbox doesn't show me how long the song is, nor does the progress bar move along the screen. Plea: It seams to me somewhere along the lines my collection has become corrupt... but where? And how? and please someone tell me I can fix it!! TIA, Dean.

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  • Port forwarding on D-Link DIR-615 super-slow, useless

    - by Jaroslav Záruba
    Hello I have replaced my old router with DIR-615 from D-Link, and now the port forwarding is so slow it makes the router practically useless for requests coming from outside of my network. Accessing the router itself (admin UI) from outside is without any issues, no delay whatsoever. But when I try to access a service residing on any of the computers in my network from outside the requests take minutes and minutes. (E.g. I can see source of my GWT-app main page, but loading additional CSS and JS files takes years.) If anyone could recommend any further diagnostics I should do to figure out what is happening it would be great. Few notes: happens with more services (web-app on Tomcat, viewing directory index via Apache) it does not make a difference whether the service is hosted on wired or wireless PC accessing the service on a localhost works fine, as does any 'inner' communication turning off firewall on target PC does not make difference either (makes sense) when I replace this router with the old one (both 192.168.1.1) everything works fine I see nothing suspicious in the router's log I believe I have the latest firmware (4.11) DIR-615 sucks, it already died once completely Regards Jarda Z.

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  • CentOS - mdadm raid1 drive won't mount to default location

    - by danny
    I'm running CentOS 5.5, the system, boot, swap, etc. is all on /dev/sda and I have two identical single-partition drives /dev/sdb1 /dev/sdc1 that are configured in RAID1 (using mdadm). It was working fine (configured to mount to /mnt/data in the fstab file) and I recently let yum install a couple of automatic updates without paying attention to what they were, and now it doesn't work. Raid is working fine (dmesg shows it gets loaded correctly). mdstat shows: # cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdc1[1] sdb1[0] XXXX blocks [2/2] [UU] unused devices: <none> Additionally, I can mount it anywhere other than its default directory (i.e. the following works, and I can read data off the drives). # mount /dev/md0 /mnt/data2 EXT3-fs warning: mounting fs with errors, running e2fsck is recommended But when I run the following I get: # mount -a mount: /dev/sdb1 already mounted or /mnt/data busy It says nothing is mounted when I try to umount /dev/sdb1 or umount /mnt/data, so I assume it's the second of those errors. However, lsof | grep mnt shows nothing. The weird thing is that I can save files in /mnt/data. So something is obviously mounted there, but when I try to umount it I get the error that nothing is mounted. /etc/mtab doesn't mention any of the partitions or files I am trying to work with, and fstab just has that one line I mentioned above that is supposed to mount my raid partition. Again, it was all working fine until I On Google I've found a few things about dmraid interfering with mdadm after an update, but I yum remove'd dmraid and rebooted and it didn't help. I'm really confused and need to get this working to get on with my work!

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  • Mac and L2TP VPN no problems, xp, vista and 7 no go :s

    - by The_cobra666
    Hi all, I've got some weird problem and I'm out off options. The situation: When connecting from my mac to the VPN server (Windows Server 2003 R2) with L2TP PSK, everything works like it should. However, when I connect from a Windows PC, nothing happens. it spits out error 809 and sometimes 789. Now I know that my ports are OK, since the mac can connect without any problems. It's the same for: XP, Vista SP2 and 7. None can connect. If I connect to the VPN server directly (to the internal IP instead of WAN from the router), it connect's without a problem. Connecting using PPTP works... now if only L2TP would work thank you very much Windows! I have checked the counters on my linux router with iptables -L -nv and they do not raise when connecting. Not on ACCEPT and not on DROP. Only when connecting from the mac. I've found the guide from Microsoft to enable: AssumeUDPEncapsulationContextOnSendRule in the registery. I have set it to "2", on the server and client. Still no go. After that registery key it started giving me error 789 instead of 809. The IPSEC services are running on the client and server. Is there anyone that ppleease can help me with this! I've been working on this for 2 days and I'm out of options. Thanks!

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  • Abnormally high amount of Transmit discards reported by Solarwinds for multiple switches

    - by Jared
    I have several 3750X Cisco switches that, according to our Solarwinds NPM, are producing billions of transmit discards per day. I'm not sure why it's reporting these discards. Many of the ports on the 3750X's have 2960's connected to them and are hardcoded as trunk ports. Solarwinds NPM version 10.3 Cisco IOS version 12.2(58)SE2 Total output drops: 29139431: GigabitEthernet1/0/43 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is XXXX (bia XXXX) Description: XXXX MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:47, output 00:00:50, output hang never Last clearing of "show interface" counters 1w4d Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 29139431 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 35000 bits/sec, 56 packets/sec 51376 packets input, 9967594 bytes, 0 no buffer Received 51376 broadcasts (51376 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 51376 multicast, 0 pause input 0 input packets with dribble condition detected 115672302 packets output, 8673778028 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 unknown protocol drops 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 pause output 0 output buffer failures, 0 output buffers swapped out sh controllers gigabitEthernet 1/0/43 utilization: Receive Bandwidth Percentage Utilization : 0 Transmit Bandwidth Percentage Utilization : 0

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  • Throughput; capacity planning help for C10K like design

    - by z8000
    I am designing a network service in which clients connect and stay connected -- the model is not far off from IRC less the s2s connections. I could use some help understanding how to do capacity planning, in particular with the system resource costs associated with handling messages from/to clients. There's an article that tried to get 1 million clients connected to the same server [1]. Of course, most of these clients were completely idle in the test. If the clients sent a message every 5 seconds or so the system would surely be brought to its knees. But... How do you do less hand-waving and you know, measure such a breaking point? We're talking about messages being sent by a client over a TCP socket, into the kernel, and read by an application. The data is shuffled around in memory from one buffer to another. Do I need to consider memory throughput ("5 GT/s" [2], etc.)? I'm pretty sure I have the ability to measure the basic memory requirements due to TCP/IP buffers, expected bandwidth, and CPU resources required to process messages. I'm a little dim on what I'm calling "thoughput". Help! Also, does anyone really do this? Or, do most people sort of hand-wave and see what the real world offers, and then react appropriately? [1] http://www.metabrew.com/article/a-million-user-comet-application-with-mochiweb-part-3/ [2] http://en.wikipedia.org/wiki/GT/s

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  • setting up subdomain wildcard: configured A record, VirtualHost... still does not work

    - by user80314
    Running Apache on CentOS, trying to setup wildcard subdomains, basically I want .mydomain.com to point to mydomain.com With cPanel I added *.mydomain.com With WHM I made sure that A record is pointing to the right IP. I set my A record: * 14400 IN X.x.x.x My httpd.conf: ServerName _wildcard_.mydomain.com ServerAlias *.mydomain.com DocumentRoot /home/mydomain/public_html ServerAdmin [email protected] UseCanonicalName Off ## User userdomain# Needed for Cpanel::ApacheConf UserDir enabled userdomain <IfModule mod_suphp.c> suPHP_UserGroup userdomain userdomain </IfModule> <IfModule !mod_disable_suexec.c> <IfModule !mod_ruid2.c> SuexecUserGroup usergrdomain userdomain </IfModule> </IfModule> <IfModule mod_ruid2.c> RUidGid userdomain userdomain </IfModule> ScriptAlias /cgi-bin/ /home/mydomain/public_html/cgi-bin/ # To customize this VirtualHost use an include file at the following location # Include "/usr/local/apache/conf/userdata/std/2/mydomain/wildcard_safe.mydomain.com/*.conf" I have my VirtualHost in httpd.conf set to point to domain root. Restarted Apache, server, dns, still nothing. I have spent hours researching this, followed instructions, set everything correctly. What am I missing?

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  • I accidentally hijacked my localhost

    - by Zach L
    Opening localhost in the browser is pointing a local webpage (examplePage) after playing with some config files a while back, and I can't figure out how to restore the default behavior. Background: I have XAMPP installed on my Windows 7 machine, and a webpage at c:/xampp/htdocs/examplePage. A couple weeks ago, I was on a mission to get sites root-relative urls (/resource) to work, so I played around with a bunch of apache/conf files, including httpd.conf and httpd-vhosts.conf and also was messing with the Windows hosts file. I gave up at some point, didn't document exactly what I did, and have since probably forgotten some of what I did. Many of my changes stemmed from suggestions in this StackOverflow post What I've Tried I commented out my additions to the hosts file I turned off XAMPP (thus hopefully negating any apache config file effect) I reverted to my original DocumentRoot in httpd.conf anyway (xampp/htdocs) localhost still displays examplePage. Even with xampp turned on (my reverted DocmentRootisn't taking effect) Does anyone know what I may have done and how I can fix it? Update : Its been resolved, thank everyone so much in taskmanager, theres a couple instances of httpd.exe (Apache HTTP Server). I ended these, and opened XAMPP, restarting apache. all references to examplePage in my .conf files that I could find had been commented out or removed. I imagine that the old versions were still in effect for some reason, and manually ending the Apache processes fixed this. As a point of interest, Its still a mystery why those processes were running - I cannot reproduce that situation. I must've stumbled upon a XAMPP bug of some sort.

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  • FastCGI and Apache 500 error intermittently

    - by benkorn1
    I have a FastCGI (mod_fastcgi)problem. It happens every once in a while, and does not casue a complete server meltdown, just 500 errors. Here are a couple things. First I am using APC so PHP is in control of it's own processes, not FastCGI. Also, I have the webroot set as: /var/www/html And the fcgi-bin inside: /var/www/html/fcgi-bin First off here is the apache error_log: [Fri Jan 07 10:22:39 2011] [error] [client 50.16.222.82] (4)Interrupted system call: FastCGI: comm with server "/var/www/html/fcgi-bin/php.fcgi" aborted: select() failed, referer: http://www.domain.com/ I also ran strace on the 'fcgi-pm' process. Here is a snip from the trace around the time it bombs out: 21725 gettimeofday({1294420603, 14360}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 6503 38*", 16384) = 46 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 96595}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 6154 23*C /var/www/html/fcgi-bin/php.fcgi - - 6483 28*", 16384) = 92 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 270744}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 5741 38*", 16384) = 46 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 311502}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 6064 32*", 16384) = 46 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 365598}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 6179 33*C /var/www/html/fcgi-bin/php.fcgi - - 5906 59*", 16384) = 92 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 454405}, NULL) = 0 I noticed that the 'select()' seems to stay the same regardless, however the read() changes its return from 46 to some other number while it is bombing out. Has anyone seen anything like this. Could this be some sort of file locking? Thanks, Ben

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  • Misconfigured external monitor on Mac OS X Snow Leopard 10.6.3

    - by Mike
    I have an external monitor (specifically, an HDTV) hooked up to my 2.53GHz 13" macbook pro. This display works fine and I use it with my mac in clamshell mode (eg. with an external keyboard/mouse and the laptop closed and the built-in mac screen turned off) My Mac has multiple users on it. For User A I can use the mac with the external monitor in both clamshell and dual-monitor setups. For User B, I can use the monitor in a dual-monitor setup, but whenever I switch to clamshell mode the Mac switches to an incorrect output resolution or frequency setting that my HDTV doesn't recognize, resulting in a blank screen and a message about Unsupported Resolution. Chances are I did this to myself by misconfiguring my display settings at some point in the past, but I have no idea how to undo it. I (obviously) can't seen the display to change the settings when it's borked. I can see the display settings if I switch to Dual-monitor mode, but those settings only affect the dual monitor setup; no matter how I change the settings in dual-monitor mode, the clamshell mode setup remains borked. How can I dig myself out of this hole?

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  • Strange IIS hits originating from Trend Micro

    - by TesterTurnedDeveloper
    I'm trying to trace thru an error on a extranet site I maintain. I've had a look thru the logs, and I'm seeing hits originate from these IP addresses: 216.104.15.130 216.104.15.138 216.104.15.142 216.104.15.13 150.70.84.49 150.70.84.44 Network-tools.com gives 'TREND MICRO INCORPORATED' as the owner of all these IPs. The hits fail as they aren't sending any cookies (therefore aren't considered logged in). The hits are to pages containing URLs that only the logged in user would see, i.e. ImageEdit.aspx?ImageId=467424. I.e. the server isn't guessing these URLs, someone would have to log into the site to know these URLs exist. Theory: the Trend Antivirus client grabs URLs and sends them to the server for 'extra processing'? Googling around gives me this: http://www.forumpostersunion.com/showthread.php?p=51272 - where people are reporting comment spam from these addresses. The articles says their servers have been hacked (a few months ago, presumably fixed now?). A hacked server wouldn't explain how the URLs have been plucked off the user's PCs. Has anyone seen this before? Anything nefarious going on here?

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  • Remote Desktop *from* Windows 2008 R2 Server

    - by freefaller
    Summary: how do I create an RDC connection from a Windows 2008 server to another server? Our client will only allow us to connect to their server via a static IP address (which is fair enough), but unfortunately as we're a very small company we don't have one in the office. As a work around, we had the connection working through our old Windows 2003 server (dynamic-cloud from 1and1). .. however we have just rebuilt the server to run under Windows 2008 R2 (don't ask, but it was necessary), and now I simply cannot get the connection working. I have added an "Outbound Rule" to Windows Firewall with Advanced Security (TCP, All local ports, 3389 remote port - I have also tried the other way around). I have added a packet filter IP security rule with the same details. The 1and1 firewall rules (through their online control panel) allows for 3389 TCP and UDP. But it is simply not connecting (yes, the server is definitely on and able to accept connections) with the general error of... Remote Desktop can’t connect to the remote computer for one of these reasons: 1) Remote access to the server is not enabled 2) The remote computer is turned off 3) The remote computer is not available on the network Is there anything obvious I've missed - or something I can use to find out where the request is being blocked? The new server is using the exact same IP address as before, so I don't believe that would be an issue. Unless it's trying to use an IPv6 address rather than the old IPv4 address that it was before? I apologise that I am not a network person by trade, but I know more than anybody else in my office!!

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  • Using AT on Ubuntu to Background Downloads (w/ Queue)

    - by Nicholas Yost
    I am writing a PHP script, but I want to use the AT command in Ubuntu to fetch a remote file via WGET. I'm basically looking to background the process, so PHP can finish fairly quickly. I cannot find any questions on here about how to use both, but I basically want to do the following pseudo-code: <?php exec('at now -q queuename wget http://path.to/remote/file.ext'); ?> Additionally, I'd like to queue this between providers. I'd like to have each path.to have its own queue, so I only download one file from each provider at a time. Meaning: <?php exec('at now -q remote wget http://path.to/remote/file.ext /local/path'); exec('at now -q vendorone wget http://vendor.one/remote/file.ext /local/path'); exec('at now -q vendortwo wget http://vendor.two/remote/file.ext /local/path'); exec('at now -q vendorone wget http://vendor.one/remote/file.ext /local/path'); ?> This should download the files from path.to, vendor.one, vendor.two immediately, and when the first file is finished downloading from vendor.one, it starts the second file. Does that make sense? I can't find anything like this anywhere on the web, much less on SO/SF. If we can use the crontab to run a one-off wget command, thats fine too.

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