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• Hyper-V: Dedicated NIC for Guests VMs

  - by TheLizardKing

  I have two NIC cards and created a private virtual network for my virtual machines and unchecked "Allow management operating system to share this network adapter" which basically turns my Guest NIC into this sorta shell of a NIC card on the host machine and the only thing checked in it's properties is "Microsoft Virtual Network Switch Protocol" which I am fine with. Everything works and everything is connected. My issue is that for some reason my guest (Ubuntu Server with legacy network drivers) is not talking properly to my DHCP server. Specifically my DHCP server reserves the guest's IP address using it's MAC address but the guest isn't picking it up. It's picking up any old IP it can get and I can't even ping the hostname from another PC on the network but it pings fine if I use the IP. I see the guest showing up in my DHCP table but I can't get the reservation to stick. Is there some reason it's only partially communicating with my DHCP server? Pinging it's hostname on itself reveals it's using 127.0.0.1 instead of it's network IP. Is this an issue with the legacy drivers used in Hyper-V?

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• Shared configuration for Eclipse on Debian server

  - by Joris Meys

  I've manually installed the latest Eclipse on our debian server and wanted to configure it so all users share the same configuration. It turned out less obvious than I thought: I don't seem to be able to install packages for all users. If I run it myself, all configuration data is saved under my own home directory. If I run Eclipse using sudo, everything is saved under the root directory but is not accessible for other users when they run Eclipse. I've been browsing the manual of Eclipse and some forums, but apart from a "yes, you can" I couldn't find any information on how that should be done. The biggest problem is installing plugins for all users to be found. Any help is greatly appreciated. Eclipse : 3.6.1 classic, installed using this procedure. Server uname: GNU/Linux * 2.6.26-2-amd64 Server is accessed using Putty, and Gnome desktop through realVNC. Just mentioning it if that is of any importance. Our sysadmin is on "prolonged leave" (working in Spain and never replaced), so I'm stuck without help here. EDIT : -- I asked this question also on StackOverflow as I wasn't certain this is a genuine server-related question. Please feel free to merge both questions at the appropriate place. --

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• TCP Server Memory management: #Connections Vs. #Requests

  - by Andrew

  Given that, there is no theoretical limit to number of concurrent TCP connections a Windows 2008 server can handle. Only thing will happen is, with each connection there will be memory consumption in server. Unfortunately, memory is not unlimited (and I want to utilize only physical memory). For example, lets say we've 2GB server memory. Now there are two extreme cases: Case 1: If we've allocated 64KB buffer for each connection (only to receive incoming request), then 32768 connections can consume all the 2GB of memory. This will not leave any memory to queue/process incoming requests from those connections. Case 2: On the other hand, lets say a single (or very few) connections continuously keeps sending request buffers (for example, video streaming from one connection to other) and server cannot process them within time, those buffers will get piled up in server and eventually will occupy most of the servers memory. And it will not leave any memory for new connection thereafter. This is the real dilemma in server design bugging me badly for last many days. If I can decide on max size of request buffer per connection and max number of requests to allow in queue per connection. Then, based on available server memory, it will then automatically set limit on max number of concurrent connections. How to decide on these limits to achieve best performance and throughput? I am just looking for perfect utilization of server resources. Are there any standard guidelines or empirical data available with someone who can share with me please.

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• XCOPY access denied error on My Documents folder

  - by Ryan M.

  Here's the situation. We have a file server set up at \fileserver\ that has a folder for every user at \fileserver\users\first.last I'm running an xcopy command to backup the My Documents folder from their computer to their personal folder. The command I'm running is: xcopy "C:\Users\%username%\My Documents\*" "\\fileserver\users\%username%\My Documents" /D /E /O /Y /I I've been silently running this script at login without the users knowing, just so I can get it to work before telling them what it does. After I discovered it wasn't working, I manually ran the batch script that executes the xcopy command on one of their computers and get an access denied error. I then logged into a test account on my own computer and got the same error. I checked all the permissions for the share and security and they're set to how I want them. I can manually browse to that folder and create new files. I can drag and drop items into the \fileserver\users\first.last location and it works great. So I try something else to try and find the source of the access denied problem. I ran an xcopy command to copy the My Documents folder to a different location on the same machine and I still got the access denied error! So xcopy seems to be denied access when it tries to copy the My Documents folder. Any suggestions on how I can get this working? Anyone know the reason behind the access denied error?

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• Self-connecting printers

  - by Martin Cerny

  Hello, I work as an administrator in a small company using XP Professional on all computers and two servers with Win 2003 Server. Recently a very unusual problam occured one of the computers keeps connecting to all the printers on the network it doesn't matter if it's an administrator or Domain User as soon as somebody logs in the commputer connects all the printers. The printers are either installed on local computers or on the server and shared. There is no log-on script connecting the printers, I install them manualy and none of the other computers shows such behaviour. We have a printer which is installed on two computers and both of them share it (I'm moving it to Server from a small PC which shared it up to now, but some computers still use the old connection), meaning this specific computer connects to one of the printer two times and it can't use either of the connections. How to prevent this self-connecting to all printers (none of the other computers has this problem). If I delte them from the "Printers" folder everything works fine untill I reconnect and the Folder is once again full of all the printers we have. I solved the smaller problem, computer is now capable of printing on all of the printers (it seems there have been some registry issues), after cleaning the registry and reinstalling the printer it seems to work just fine. But the second thing prevails, the computer connects to all the printers in the network (when I remove one/multiple it is reconnected right after the next log-in by any user).

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• Linux: can't downgrade ATI graphic driver

  - by java.is.for.desktop

  I had the old 10.9 driver of ATI, it worked fine. Sadly, I decided to upgrade it to the new 10.12. After that, HDMI stopped working. So, I want to downgrade back to 10.9. I did everything by the book. But it fails: As root, I do: cd /usr/share/ati sh ./fglrx-uninstall.sh Yes, the uninstall process tells me that everything is fine uninstalled. And after doing reboot, I have the default opensource ATI driver which comes with X11 (or the kernel?). The ATI control panel shortcut points to nowhere. So, the driver seems uninstalled. Now I install the older (10.9) proprietary ATI driver. It also finishes successfully. But after reboot, the ATI control panel tells me that I still have 10.12. And it seems to be true, because HDMI doesn't work. So, how can I completely purge the new non-working driver and downgrade to the old one?

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• How do I install php 5.3 on CentOS?

  - by fivelitresofsoda

  Hi, I have to install php5.3 on my centos server. If i do yum install php, the base repo installs 5.1.6 which is too old for the apps i need to install. So i've been trying to use the ius repository, following the official instructions from ius: root@linuxbox ~]# wget http://dl.iuscommunity.org/pub/ius/stable/Redhat/5/x86_64/ius-release-1-2.ius.el5.noarch.rpm root@linuxbox ~]# wget http://dl.iuscommunity.org/pub/ius/stable/Redhat/5/x86_64/epel-release-1-1.ius.el5.noarch.rpm root@linuxbox ~]# rpm -Uvh ius-release*.rpm epel-release*.rpm Ok. Now i simply do yum install php53, etc for all i need... but i get this error: Running rpm_check_debug Running Transaction Test Finished Transaction Test Transaction Check Error: file /usr/bin/php from install of php53u-cli-5.3.4-3.ius.el5.x86_64 conflicts with file from package php-cli-5.1.6-27.el5_5.3.x86_64 file /usr/bin/php-cgi from install of php53u-cli-5.3.4-3.ius.el5.x86_64 conflicts with file from package php-cli-5.1.6-27.el5_5.3.x86_64 file /usr/share/man/man1/php.1.gz from install of php53u-cli-5.3.4-3.ius.el5.x86_64 conflicts with file from package php-cli-5.1.6-27.el5_5.3.x86_64 file /etc/php.ini from install of php53u-common-5.3.4-3.ius.el5.x86_64 conflicts with file from package php-common-5.1.6-27.el5_5.3.x86_64 Error Summary ------------- I have no idea how to solve this. I think i have to delete the base packages however as a linux noob i don't know how to do that. Please help. Thank you.

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• Is there a screen sharing/remote desktop app for mac that lets you use a different host screen resolution?

  - by MarqueIV

  Ok, there are tons and tons of questions about remote desktop for mac and they're all being closed as duplicates. I however am specifically looking for one that will let me use a different resolution than the host, the way you can with Remote Desktop for Windows. For instance, when I connect to my 11" Macbook Air booted into Windows7 from my quad-screen desktop, also booted into Win7 using Microsoft's Remote Desktop Client, it blanks out the screen on the notebook, then virtualizes the video across all four of my desktop's monitors at their native resolutions (2560x1600, 2 x 1920x1200 and 1600x1200) and the notebook now acts as if it has four physical monitors connected to it. All of this from a notebook that only has a 1366 x 768 native resolution. Even when running OS X on the client running RDC, while it doesn't support multi-monitors like its Win counterpart, it still lets me run at the native resolution of the client screen of 2560x1600. Again, it just blanks out the host screen while doing so. However when using Mac's screen sharing, since that is just glorified VNC, it just mirrors what's already on the host's screen, meaning it will always be a single screen with the resolution of 1366x768. This of course makes sense since VNC is a mirroring solution, not a video-virtualizing one like RDC, but it means that on my quad-monitor setup, the remote window isn't even large enough to fill up a single monitor, let alone four (unless you have a client that can scale it up, but that's video scaling. It's still only 1366x768.) So what I'm looking for is if there is a solution on the Mac that lets me do the same thing as RDC in a Win environment. Don't care if I have to pay. I'd gladly pay several hundred dollars for this. I just need that specific feature. Note: People have suggested various VNC clients, but the VNC host still runs at 1366x768 so that will not work here. Ever. Also, people have suggested Synergy/Synergy+/Teleport and such which share the keyboard and mouse, not video. Completely different animal unrelated to what I'm looking for.

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• DNS to \\Server\ wrong - \\Server.company.local\ works fine

  - by JimmyClif

  I had a little network glitch and since then one of my servers shows up wrong at some workstations when typing in \\server\. Example: On workstationA I go to Explorer and and type \\server\ and it brings me to our copier at 192.168.2.101. \\server.company.local\ gets me to the right place at 192.168.2.252. Ping with server pings 192.168.2.252 - same correct result with ping server.company.com nslookup also shows correct result with both. reverse lookup by ip is correct also. I flush the DNS on the workstation and the error still occurs. reboot same result. At that point I give up and start remapping the shares to \\server.company.local\share just to get the user back working... DNS Server has correct entries for that server. Can access the server via \\server\ on dns server, all looks fine. Eventually the workstation figures it out by itself and \\server\ works again but my life wouldn't be as stressful if I had a clue what happened or how to fix it myself. Thanks for your time looking and answering.

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• Broad Band LAN connection through existing 6 wire phone line ( no phone connected )

  - by Paul Taylor

  I have an (up to but never achieved ) 10 mb broadband signal coming into my house along the telephone line. The modem then connects the broadband signal via a LAN connection and Wi-Fi signal to my computers and iPad. My workshop desk is 54 yards (approx. 50m) downhill from the modem (part of a separate building) – too far to give a good direct signal. The inside corner of the workshop (by a window) receives a weak signal. I have a disconnected telephone cable consisting of 6 wires going from the house to the workshop. The telephone is no longer used in the workshop - we use our mobile number for business calls. A broad band signal using the cable would not have to share with a phone. What would be the most economic price/efficient way to get the broadband signal to the workshop? I am writing in hope that since the telephone didn't need the six wires, an Ethernet connection might be similar and not need all the eight wires for a LAN connection. In theory could use the telephone wire to pull an Ethernet cable trough the underground pipe but I doubt if the cable would survive the strain. The broad band connection in the workshop does not have to have network facility. My skill level is high enough to do house wiring, plumbing and gas fitting; so given any sound advice and a wiring diagram or instructions I can probably work out the rest myself.

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• CUPS printer on Vritual Machine can be access via CUPS admin, but not by XP?

  - by SJaguar13

  I have a Zebra label printer connected to a Linux Mint virtual machine. It was set up with CUPS and a Windows XP computer can then print to it via http://192.168.1.76:632/printers/labelprinter. That was all fine and dandy I then hooked up a Fargo Pro L PVC card printer to a Windows XP virtual machine. I had to disconnect the label printer as the server that hosted both virtual machines only has 1 parallel port. Now I plugged in the Zebra again, and it cannot print from the Windows XP computer anymore. If I go to the CUPS admin panel on the Windows XP computer, I can see it, everything looks fine, and I can send it a test page to print which works. If I try to print from Windows, I get an error that the printer is not found/cannot connect to the server. The only other thing that changed was the firewall on the router to allow remote desktop to another computer from outside the network, but all the firewall stuff was for external use. Nothing affected the IP address of the internal network. The Linux Mint VM also had a PDF pritner that was shared with CUPS. That printer is also down. I tried setting up a new CUPS installation on another VM, and when I go to share it with XP, I get the same error. I don't know what to try. It has access, it can get to the admin from that computer, it seems to be up and ready, but when Windows tries to connect, the printer isn't found even though 4 days ago everything was fine. Any ideas?

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• Execute remote shell commands on windows XP embedded

  - by BartD

  The following situation: We have Windows XP Embedded clients that have all admin shares disabled and only have read-only shares (for security reasons). What we want to do is run remote shell (dos) commands on these machines. At first we looked at PsExec & BeyondExec applications (and all sorts of variants), but all of them rely on having at least an admin$ share, which are disabled on our systems. Telnet is not secure enough, as is RSHD servers. So we looked at the next obvious solution: and SSH server. We also prefer an open-source or freeware solution that is still maintained. I looked at freeSSH server for Windows, but that didn't run stable, I tried installing copSSH, WinSSH & openSSH for Windows, but none of these applications seem to work on Windows XP Embedded. The services can either not be installed or cannot be started. I don't know why. Some kind of dependency that is missing. So are there any other solutions out there? I don't care about having to an agent installation locally of some kind on each system, as long as the size of the software is small enough. Can someone suggest some alternatives to what I've already mentioned? Thank you very much.

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• Why does my Belkin Play router regularly stop working for a few minutes at a time?

  - by YeahStu

  I recently purchased a Belking Play dual-band router for my home. About every few hours, the router stops working or "cuts out" for several minutes before coming back online automatically. My old one did this as well. I figured out a main problem was my wireless home phone, which sends a 2.4GHz signal. Anytime someone would call the phone, my router would get interrupted. Therefore, I unplugged this phone and got a wired phone. Unfortunately, my wired phone has the same problem. Therefore, I unplugged the wired phone. Unfortunately, my router still has regular issues. I live in a home with neighbors within close proximity to me, so it might be possible that their devices are the ones causing me problems. How can I determine what is causing my router problems? I thought that the point of a dual-band router was that if a signal was interfering on one band then it would be uninterrupted on another. However, it seems that is not the case. Does anyone have any tips on how to troubleshoot this or any knowledge you can share to properly set my expectations?

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• Windows Server 2008 can't start postgresql-x64-9.0 service: could not create any TCP/IP sockets

  - by Rob

  After rebooting a Windows Server 2008 machine to apply system updates, we recently we began having some issues running PostgreSQL 9.0. When we noticed the problem, we reverted the Windows updates, but the issue persists: From services.msc, attempting to start the postgresql-x64-9.0 service fails. Half-way through starting the progress bar becomes very slow, and eventually responds with error 1053; "the service did not respond in a timely fashion." Interestingly enough, bringing up the task manager shows multiple instances of postgres.exe have been started, and looking at the log file shows: 2011-02-10 14:44:02 ESTLOG: database system is ready to accept connections I then tried killing the processes, and starting via the command-line (as the user postgres), but I receive a different error: C:/Program Files/PostgreSQL/9.0/bin/pg_ctl.exe start -N "postgresql-x64-9.0" -D "F:/SHARE/postgres" -w waiting for server to start............................................................... pg_ctl: could not start server ESTWARNING: could not create listen socket for "192.168.0.101" ESTFATAL: could not create any TCP/IP sockets The log file again indicates that the database is ready to accept connections. Also, using netstat indicates that no other processes are using port 5432; I can't think of any other obvious reason that opening the listen socket might fail. Any help would be greatly appreciated.

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• Tunneling a public IP to a remote machine

  - by Jim Paris

  I have a Linux server A with a block of 5 public IP addresses, 8.8.8.122/29. Currently, 8.8.8.122 is assigned to eth0, and 8.8.8.123 is assigned to eth0:1. I have another Linux machine B in a remote location, behind NAT. I would like to set up an tunnel between the two so that B can use the IP address 8.8.8.123 as its primary IP address. OpenVPN is probably the answer, but I can't quite figure out how to set things up (topology subnet or topology p2p might be appropriate. Or should I be using Ethernet bridging?). Security and encryption is not a big concern at this point, so GRE would be fine too -- machine B will be coming from a known IP address and can be authenticated based on that. How can I do this? Can anyone suggest an OpenVPN config, or some other approach, that could work in this situation? Ideally, it would also be able to handle multiple clients (e.g. share all four of spare IPs with other machines), without letting those clients use IPs to which they are not entitled.

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• Windows 7 - media sharing extremely flakey (XBox 360)

  - by Nathan Ridley

  I have constant headaches with Windows Media Library sharing, which I'm using to share my video library (a whole lot of AVI files on my computer's hard drive) with the XBox 360. I have the whole setup working, so setup and basic configuration is not an issue. The issue is that Windows Media Library frequently fails to notice additions and modifications to the "watched" folders. Not only that, but often after I've added something new to the library, it fails to transmit this new library information to the 360, as is demonstrated by the fact that, using that 360, I navigate to my video library and the new folders don't show up in the list. Often the only way to get the 360 to see the changes is to exit out of "Videos" on the 360, then remove all videos from Windows Media Library, go back into videos on the 360 to confirm that nothing is shared, then re-add a few videos (but not too many) in Windows Media Library, then go back into the videos in the 360. The whole thing is a real pain in the bum and I really wish I could just add all my videos to Windows Media Library and have it keep watch without me having to kick it, and have the 360 pick up changes without me having to constantly rebuild the library. Any ideas?

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• OS X can connect to Windows machine, but can't access shared folders

  - by Bonnie

  I can create new folders on my Windows XP machine, set them to "shared". On my Mac, I pick Finder → Go → Connect to Server → smb://192.168.1.4 → Connect → Name / Password. It even shows me all the names of the newly created shared-folders on my PC, but when I try to actually connect to any of them I get connection failed, there was an error connecting Any idea on what would cause that? The fact that it successfully gets so far—to actually showing me my PC share-names—must mean I have 99% of this working correctly, i.e. the physical connection, the IP address, the user name, the password, etc. Still, I can't seem to access the folders themselves. I've tried this with my Windows XP firewall on/off, and Norton AntiVirus on/off. Same problem. Everything did work fine, 4 months ago. Were there any odd OS X or Windows updates released recently? I always apply them all. smbclient on the Mac does correctly find the XP machine, my XP user name, and accepts my XP password. I get the following from that smbclient command: Doing spnego session setup (blob length=16) server didn't supply a full spnego negprot Got challenge flags: ... Got NTLMSSP flags: ... Got NTLMSP flags: ... Domain=[XPMACHINE] OS=[Windows 5.1] Server=[Windows 2000 LAN Manager] tree connect failed: NT_STATUS_INSUFF_SERVER_RESOURCES I'm not sure why a standard XP box can't "supply a full spnego negprot". Whatever that means. Using XP's RegEdit to change my IRPStackSize from 11... to 13, 15, 20, 22... still gives that "NT_STATUS_INSUFF_SERVER_RESOURCES" error on the Mac.

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• What is the difference between these Pentium Extreme Edition CPUs?

  - by Giffyguy

  The CPU in question is the Pentium Extreme Edition 955. Intel's website shows four "versions", but for the most part they all look identical. They even share the same set of ordering codes. But one of them has a substantially lower TDP, which is seemingly unexplainable - since everything else is the same. Two of them say "LGA775, Tray" and I have no idea what "Tray" means either. Also, two of them have a different SPEC code. What I need to know is: What does "LGA775, Tray" mean? Why does the one CPU have a lower TDP? And what does that mean for me? Does that mean lower maximum power consumption? Does it mean the CPU may be more stable/endurant, because of a lower heat output? Why do two of them have a different SPEC code, and what does this mean? Finally, what does PLGA775 (as opposed to LGA775) mean, and do I need to be worried about that? Information from Intel's wbsite: Intel® Pentium® Processor Extreme Edition 955 (4M Cache, 3.46 GHz, 1066 MHz FSB) with SPEC Code 1 Boxed Intel® Pentium® Processor Extreme Edition 955 4M Cache, 3.46 GHz, 1066 MHz FSB LGA775 PLGA775 B1 95 Watts BX80553955 SL94N 2 Intel® Pentium® Processor Extreme Edition 955 4M Cache, 3.46 GHz, 1066 MHz FSB LGA775, Tray PLGA775 B1 130 Watts HH80553PH0994M SL94N 3 Boxed Intel® Pentium® Processor Extreme Edition 955 4M Cache, 3.46 GHz, 1066 MHz FSB LGA775 PLGA775 B1 130 Watts BX80553955 SL8WM 4 Intel® Pentium® Processor Extreme Edition 955 4M Cache, 3.46 GHz, 1066 MHz FSB LGA775, Tray PLGA775 B1 130 Watts HH80553PH0994M SL8WM

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• EFS Remote Encryption

  - by Apoulet

  We have been trying to setup EFS across our domain. Unfortunately Reading/Writing file over network share does not work, we get an "Access Denied" error. Another worrying fact is that I managed to get it working for 1 machine but no other would work. The machines are all Windows 2008R2, running as VM under ESXi host. According to: http://technet.microsoft.com/en-us/library/bb457116.aspx#EHAA We setup the involved machine to be trusted for delegation The user are not restricted and can be trusted for delegation. The users have logged-in on both side and can read/write encrypted files without issues locally. I enabled Kerberos logging in the registry and this is the relevant logs that I get on the machine that has the encrypted files. In order for all certificate that the user possess (Only Key Name changes): Event ID 5058: Audit Success, "Other System Events" Key file operation. Subject: Security ID: {MyDOMAIN}\{MyID} Account Name: {MyID} Account Domain: {MyDOMAIN} Logon ID: 0xbXXXXXXX Cryptographic Parameters: Provider Name: Microsoft Software Key Storage Provider Algorithm Name: Not Available. Key Name: {CE885431-9B4F-47C2-8415-2D766B999999} Key Type: User key. Key File Operation Information: File Path: C:\Users\{MyID}\AppData\Roaming\Microsoft\Crypto\RSA\S-1-5-21-4585646465656-260371901-2912106767-1207\66099999999991e891f187e791277da03d_dfe9ecd8-31c4-4b0f-9b57-6fd3cab90760 Operation: Read persisted key from file. Return Code: 0x0[/code] Event ID 5061: Audit Faillure, "System Intergrity" [code]Cryptographic operation. Subject: Security ID: {MyDOMAIN}\{MyID} Account Name: {MyID} Account Domain: {MyDOMAIN} Logon ID: 0xbXXXXXXX Cryptographic Parameters: Provider Name: Microsoft Software Key Storage Provider Algorithm Name: RSA Key Name: {CE885431-9B4F-47C2-8415-2D766B999999} Key Type: User key. Cryptographic Operation: Operation: Open Key. Return Code: 0x8009000b Could this be related to this error from the CryptAcquireContext function NTE_BAD_KEY_STATE 0x8009000BL The user password has changed since the private keys were encrypted. The problem is that the users I using at the moment can not change their password.

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• mount multiple folders with nfs4 on centos

  - by microchasm

  I'm trying to get nfs4 working here. Machine 1 (server) I have a folder and in it 2 other folders I'm trying to share independently. /shared/folder1 /shared/folder2 Problem is, I can't seem to figure out how to mount the folders independently on the client. (Machine 1 - server) /etc/exports: /var/shared/folder1 192.168.200.101(rw,fsid=0,sync) /var/shared/folder2 192.168.200.101(rw,fsid=0,sync) ... exportfs -ra (Machine 2 - client) /etc/fstab: 192.168.200.201:/folder1/ /home/nfsmnt/folder1 nfs4 rw 0 0 ... mount /home/nfsmnt/folder1 mount.nfs4: 192.168.200.201:/folder1/ failed, reason given by server: No such file or directory The folder is there. I'm positive. I think there is something simple I'm missing, but I'm totally missing it. It seems like there should be a way in fstab to tell nfs which folder on the server I want to mount. But I can only find references to what looks like a root mount point (e.g. 192.168.1.1:/) which I assume is handled by exports on the server. But even with the folders set up in exports, there doesn't seem to be an apparent way to pich and choose which gets mounted. Is it not possible to mount separate folders from the same server to different mount points on the client? Any help appreciated.

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• MongoDB on 128mb 32-bit VPS (plus Tornado and Redis)

  - by apito

  i am curious about how mongodb will perform in a limited vps. specifically, i'll deploy this configuration on 32-bit ubuntu 9.04 server with 128Mb memory (UPDATE: now i'm considering 360mb too). nginx and redis three instances of tornado apps (one is for mobile site; limited app, not my primary audience); has around 8 Collections. social webapp for my community. mongodb all beside mongodb seems to have small footprint. memory-mapping-wise, i dont know how mongodb will behave. i know it's a little bit a stretch to use this kind of config on a tiny vps, but that's what i can afford for now. i expect to have.. hmm.. maybe ~50 15rps. i did my homework doing a lot of frontend optimizations and yslow says grade A 91 (ruleset V2) :-) anyone willing to share experiences? eg. how big the data set size when mongo hit the ceiling, performance when mongo do a lot of disk IO, etc. thanks. UPDATE: this is my pet project. i'll get back to you when i have next spare time to do same httperf in a vbox with exact spec. suggestion how to do stress testing welcomed. i'm new to this kind of stuff.

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• Scaling databases with cheap SSD hard drives

  - by Dennis Kashkin

  Hey guys! I hope that many of you are working with high traffic database-driven websites, and chances are that your main scalability issues are in the database. I noticed a couple of things lately: Most large databases require a team of DBAs in order to scale. They constantly struggle with limitations of hard drives and end up with very expensive solutions (SANs or large RAIDs, frequent maintenance windows for defragging and repartitioning, etc.) The actual annual cost of maintaining such databases is in $100K-$1M range which is too steep for me :) Finally, we got several companies like Intel, Samsung, FusionIO, etc. that just started selling extremely fast yet affordable SSD hard drives based on SLC Flash technology. These drives are 100 times faster in random read/writes than the best spinning hard drives on the market (up to 50,000 random writes per second). Their seek time is pretty much zero, so the cost of random I/O is the same as sequential I/O, which is awesome for databases. These SSD drives cost around $10-$20 per gigabyte, and they are relatively small (64GB). So, there seems to be an opportunity to avoid the HUGE costs of scaling databases the traditional way by simply building a big enough RAID 5 array of SSD drives (which would cost only a few thousand dollars). Then we don't care if the database file is fragmented, and we can afford 100 times more disk writes per second without having to spread the database across 100 spindles. . Is anybody else interested in this? I've been testing a few SSD drives and can share my results. If anybody on this site has already solved their I/O bottleneck with SSDs, I would love to hear your war stories! PS. I know that there are plenty of expensive solutions out there that help with scalability, for example the time proven RAM-based SANs. I want to be clear that even $50K is too expensive for my project. I have to find a solution that costs no more than $10K and does not take much time to implement.

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• MacBook Pro with OSX 10.6.3 (Snow Leopard) Wi-Fi network connection breaks after few minutes

  - by Yanick Landry

  I have a MacBook Pro with OSX 10.6.3 (Snow Leopard). After connecting on a Wi-Fi network, the connection "breaks" after a few minutes. What I mean by "breaking" is that all requests, whether it is loading a web page, connecting to a share folder, connecting to my local router at 192.168.0.1, or pinging anything doesn't get through (time out). When in a "break" situation, I can see in the Network Settings panel that I still have an active IP, which I can successfully ping. I have this problem at home with a router D-Link DI-624 and at work with a D-Link WBR-2310, all with updated firmwares. I thought DHCP was the issue. So I tried assigning a fixed IP address (192.168.0.166). It successfully connects, but after a few minutes, the connection still breaks. The solution I'm currently using is that I disable the AirPort (on the Network icon menu in the top bar), wait a few seconds then re-enable it. It then quickly works, but the connection still breaks after a few minutes. I tried Googling my problem but I think I can't find any good keywords ! It's my first question here, so sorry if I don't respect some rules.

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• ubuntu 10.04 + php + postfix

  - by mononym

  I have a server I am running: Ubuntu 10.04 php 5.3.5 (fpm) Nginx I have installed postfix, and set it to loopback-only (only need to send) The problem is it is not sending. if i issue (at command line): echo "testing local delivery" | mail -s "test email to localhost" [email protected] I get the email no problem, but through PHP it does not arrive. When I send it via PHP, mail.log shows: Mar 28 10:15:04 host postfix/pickup[32102]: 435EF580D7: uid=0 from=<root> Mar 28 10:15:04 host postfix/cleanup[32229]: 435EF580D7: message-id=<20120328091504.435EF580D7@FQDN> Mar 28 10:15:04 host postfix/qmgr[32103]: 435EF580D7: from=<root@FQDN>, size=1127, nrcpt=1 (queue active) Mar 28 10:15:04 host postfix/local[32230]: 435EF580D7: to=<root@FQDN>, orig_to=<root>, relay=local, delay=3.1, delays=3/0.01/0/0.09, dsn=2.0.0, status=sent (delivered to maildir) Mar 28 10:15:04 host postfix/qmgr[32103]: 435EF580D7: removed any help appreciated, my main.cf file: smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = no # TLS parameters smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. myhostname = FQDN alias_maps = hash:/etc/aliasesalias_database = hash:/etc/aliases myorigin = /etc/mailname #myorigin = $mydomain mydestination = FQDN, localhost.FQDN, , localhost relayhost = $mydomain mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = loopback-only virtual_alias_maps = hash:/etc/postfix/virtual home_mailbox = mail/

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• Prevent Amazon EC2 Time zone from reverting back on yum update

  - by D.Tate

  I use an Amazon EC2 server instance that runs a distro called Amazon Linux AMI. (I've read that it is based on CentOS/Red Hat). My specific version is the 2012.09 release. Anyway, I was able to change the time zone about a week ago from the default UTC to America/New_York (which is EST/EDT). The command I used to change it was: ln -sf /usr/share/zoneinfo/America/New_York /etc/localtime ...thanks to this other Server Fault question. At that point, I was able to run date from the the command line, and it correctly displayed the EDT time. And even after EDT "fell back" to EST this past Sunday, I was pleased to find that running date still produced the correct local time. So that was great. However, after running a yum update yesterday, it seems that my time zone got reverted back to plain 'ol UTC. I even checked the last modified time of /etc/localtime file, and indeed it confirmed that it had been modified around the same time I had updated. Is there any way to prevent this from happening again, or will I be stuck resetting the time zone every time I do a yum update?

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