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  • filter / directing URLs coming onto a network

    - by Jon
    Hi all, I an not sure if this is possible or not but what i would like to do is as follows: I have one IP address (dynamic using zoneedit.com to keep it upto date). I have one webserver running my main site which is an Ubuntu machine running Apache. I also have a windows 2008 server running another site. Just to confuse things I also run part of my Apache site on the windows server, currently using proxypassreverse to get the information from it. So it looks something like this: IP 1.2.3.4 maps to mydomain.com as well as myotherdomain.com All requests that come into port 80 are forwarded to the Apache box and I use Virtualhost settings to proxy the windows sites where needed. so mydomain.com is an Apache site mydomain.com/mywindowssection is the Apache server using proxypassreverse to get part of the site from the Windows server myotherdomain.com uses Apache and proxypassreverse to get the whole site. What I would like to be able to do is forward all http requests that come into my network to one machine that figures out who should be serving that content. so: mydomain.com would go to the Apache machine myotherdomain.com would go the windows machine. I am just in the process of setting up an Astaro gateway (never done this before so taking a while to configure) as my firewall, dns, dhcp etc, don't know if this can handle it. I have the capacity to run a VM on the network if a seperate box would be needed for this process as well. Thanks for any and all feedback. Jon

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  • Can USB Hubs affect peripheral performance?

    - by Daniel Rasmussen
    Like many laptops, mine has 2 USB 2.0 ports. I'm looking to purchase a USB hub for my peripheral devices. I'm also planning on purchasing a laptop cooler with two USB powered fans, which connects to a USB port but can extend the plug, so it doesn't use one up. (Sorry for the poor description; see the link for a picture.) My questions are these: Can one plug 'too many' peripherals into a USB port? Can I plug my fans into a port, then the hub into the fans, then my keyboard and mouse, mic, and webcam into the extender..? Is it possible to draw too much power from a port? Secondly, will a USB hub affect the performance of any of my devices? I'm mostly worried about my mouse and keyboard. I like wired mice because I've noticed some lag in my Bluetooth mouse.

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  • How to configure mod_proxy_balancer to gracefully fail under high load

    - by bramp
    We have a system which has one Apache instance in front of multiple tomcats. These tomcats then connect to various databases. We balance the load to the tomcat with mod_proxy_balancer. Currently we are receiving 100 requests a second, the load on the Apache server is quite low, but due to database heavy operations on the tomcats, the load there is roughly 25% (of what I estimate they can handle). In a few weeks there is an event happening and we estimate that our requests will jump significant, maybe by a factor of 10. I'm doing everything I can do reduce the load on our tomcats, but I know we are going to run out of capacity, so I would like to fail gracefully. By this I mean, instead of trying to deal with too many connections which all timeout, I would like Apache to somehow monitor average response time, and as soon as the response time to Tomcat is getting above some threshold, I would like a error page displayed. This means that users who are lucky still get a page rendered quickly, and those who are unlucky get a error page quickly. Instead of everyone waiting far too long for their page, and eventually everyone timing out, and the database being swamped with queries which are never used. Hopefully this makes sense, so I was looking for suggestions on how I could achieve this. thanks

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  • Migrate Sql Server 2000. Which is better, 2005 vs 2008?

    - by Jhonny D. Cano -Leftware-
    My company has a Server with Windows Server 2003, and SQL Server 2000. We are planning to migrate just the database server, a provider said us the migration would be better to 2005 first, and then to 2008, because "the SQL Server 2008 is best suited for Windows Server 2008". Which are the pros and cons of each of these approaches? Migrate SQL 2000 to SQL 2005 and then to SQL 2008 Migrate SQL 2000 directly to SQL 2008 NOTE: Changing Operating System is not an option ($$$) right now for the company. Any article or experiences would be very much appreciated

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  • HTTP Error: 413 Request Entity Too Large

    - by Torben Gundtofte-Bruun
    What I have: I have an iPhone app that sends HTTP POST requests (XML format) to a web service written in PHP. This is on a hosted virtual private server so I can edit httpd.conf and other files on the server, and restart Apache. The problem: The web service works perfectly as long as the request is not too large, but around 1MB is the limit. After that, the server responds with: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>413 Request Entity Too Large</title> </head><body> <h1>Request Entity Too Large</h1> The requested resource<br />/<br /> does not allow request data with POST requests, or the amount of data provided in the request exceeds the capacity limit. </body></html> The web service writes its own log file, and I can see that small messages are processed fine. Larger messages are not logged at all so I guess that something in Apache rejects them before they even reach the web service? Things I've tried without success: (I've restarted Apache after every change. These steps are incremental.) hosting provider's web-based configuration panel: disable mod_security httpd.conf: LimitXMLRequestBody 0 and LimitRequestBody 0 httpd.conf: LimitXMLRequestBody 100000000 and LimitRequestBody 100000000 httpd.conf: SecRequestBodyLimit 100000000 At this stage, Apache's error.log contains a message: ModSecurity: Request body no files data length is larger than the configured limit (1048576) It looks like my step #4 didn't really take, which is consistent with step #1 but does not explain why mod_security appears to be active after all. What more can I try, to get the web service to receive large messages?

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  • NetFlow Storage Calculator

    - by javano
    I am planning to deploy a NetFlow server (using NfSen/NfDump) for harvesting data from Cisco devices; Are there standard calculations or guidelines I can use to calculate my server requirements, specifically I need to plan for storage. Is there a way of knowing how much data I will collect per day for example, given N flows? Lets say one device has 10k flows per day, this is typically XYZ MBs, so I can scale this up? If not, how many flows are you guys and girls recording per day, and how much data is this generating? Hopefully we can generate an estimate from everyone else's figures! P.S. If it makes a difference, I'll be collecting from <= 50 devices max (non more than 50Mbps each).

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  • OpenVPN Server - CPU is pegged out

    - by ericl42
    Hello, I am configuring OpenVPN to act as a SSL tunnel for a remote location. I have OpenVPN1 at our current location acting as a server then OpenVPN2 at the other location that is acting as a client but is also acting as a DHCP server to machines behind it so they are basically connected to the local LAN. Everything is set up fine and I can talk from location A to location B with no problems like everyone is local. I am however having some performance issues. OpenVPN1 CPU is pegged to 100% the entire time I am copying or doing any type of activity through the tunnel. I expect some CPU usage going up but nothing like this. It's really killing my performance. OpenVPN1 is running in ESX right now with 2 gig RAM and 4 procs with unlimited bursting capacity. I am using AES-192 encryption with a 1024 key. Any idea how I can get my CPU down on OpenVPN1 and my download/upload speeds higher between the tunnel? Thanks. edit: Turning down the logging helped boost the throughput a little bit, but I am still fairly shy of where I believe I should be. Also I am still maxed out on the CPU. Does anyone have any ideas? I am really stuck on this. Thanks.

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  • Laptop shuts down randomly without warning

    - by Robert P.
    My Asus Zenbook UX32V turns off randomly when I'm working on it. This happens both when the computer is recently turned on (5 minutes), and after being on for several days. I'm not running any heavy software The laptop is not heating The fan is not working on the maximum capacity (it's not heating) It happens when the laptop is lying still on the table It is no warning, it simply goes black It happens both when charging and on battery My guess is that it suddenly lose power somehow. What puzzles me is that I can flip the laptop upside down, sideways, shake it, etc. without it shutting off. This makes me think it's not something that's loose causing occasional short-circuits. I realize that the laptop probably doesn't like flipping and shaking, but it was the best way I could troubleshoot. I rarely turn the computer off, only have it in hibernate or sleep mode (most often hibernate). I've never experienced that the laptop is off when I wake it up from sleep mode. I've had the problem for a few months and it happens 2-8 times a week. Specs: Asus Zenbook UX32V Windows 8.1 (it happened in Windows 8.0 too) Intel i5-3317U CPU @ 1.70GHz The laptop is approx 1.5 years, but it has a small dent on one of the sides that probably voids the warranty. The dent has been there since week one and I don't think it's related to the problems I'm having now. Does anyone have a clue what might cause this, and how it might be fixed? I've read all other questions (some of which are listed below) that seem related to my issue, but none report the same behavior as I'm experiencing. Most report heavy games, heating etc. Asus N53J Laptop randomly shuts down Laptop is randomly shutting off Computer shuts down without warning My laptop acer aspire 5720 suddenly turn off randomly Computer randomly shutting down Windows 8.1 randomly shuts self down ASUS K55VM Laptop unexpectedly shuts down

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  • DAS vs SAN storage for serving 2 to 4 nodes

    - by Luke404
    We currently have 4 Linux nodes with local storage, arranged in two active/passive pairs with storage mirrored using DRBD, running virtual machines (actually using Xen Hypervisor) for typical hosting workloads (mail, web, a couple VPS, etc.). We're approaching the (presumed) maximum IOPS of those servers, and we're planning to migrate to an external storage solution with two active nodes, with capacity for up to four active nodes. Since we're an all-Dell shop I've done some research and found the MD3200 / MD3200i products should be the ones we're looking for. We are pretty sure we won't be attaching more than 4 hosts on a single storage and I'm wondering if there is any clear advantage for one or the other. In theory I should be able to attach 4 SAS hosts to a single MD3200 (single links on a single controller MD3200, or dual redundant SAS links from each host to a dual-controller MD3200), or 4 iSCSI hosts to a single MD3200i (directly on its 4 GigE ports without any switch, again with dual links for the dual controller option). Both setups should let us implement live VM migration since all hosts can access all the LUNs at the same time, and also some shared filesystem like GFS2 or OCFS2. Also, both setups should allow full redundancy of the whole system (assuming dual controllers in the storage). One difference I can see is that the DAS solution is actually limited to 4 hosts while the iSCSI one should be able to grow to more hosts (adding two GigE switches to the mix). One point for the iSCSI solution is that it would allow us to start out with our current nodes and upgrade them at a later time (we can't add other SAS controllers, but they already have 4 GigE ports each). With the right (iSCSI|SAS) controllers I should be able to connect diskless nodes and boot them off the external storage which I think is a good thing (get rid of any local storage). On the other hand, I would have thought the SAS one to be cheaper but it seems like an MD3200 actually costs a little less than an MD3200i (?) (please note: I've used Dell gear in my examples since that's what we're looking for but I assume the same goes with other vendors) I would like to know if my assumptions above are correct, and if I'm missing any important difference between the two setups.

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  • thought on real time web analytics

    - by Linus
    we have a few web servers and am planning to create a dashboard to show the real time stats ip address,geo-location and other custom data based on database lookups. Splunk sort of fits perfectly but wondering if there are any open source alternative . i have looked at logstash and graylog2, but to my knowledge they are more of a log analysis tools. Piwik is sort of interesting except that i cannot put any javascript on the webpages. All i have access to is apache web log. Any recommendations please..

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  • Oracle RAC interconnect in a Dell M1000e Blade Enclosure

    - by Antitribu
    We are looking at a Dell M1000e enclosure and appropriate Blades with 4 NICs each. We are planning on running Linux/Oracle 11g RAC on two blades, storage will be handled on an iSCSI SAN for which two NICs (via passthrough) will be connected leaving us with two NICs (via blade centre switches). We would like to have an interconnect (obviously) , an external IP and an internal IP. Would best practice be to: bond the remaining two interfaces and VLAN as appropriate to provide three virtual interfaces? run the interconnect on one interface and VLAN the external/internal interfaces? purchase a blade with more NICs as the above is a terrible idea? Another option? Please feel free to point out the blindingly obvious or to relevant documentation on support.oracle. I am specifically interested in supported configurations and best practices. Thanks!

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  • 10 gigabit or 1 gigabit switch

    - by Guntis
    We are planning to move mysql to dedicated box. At this moment we have web servers and mysql is running on each. Question is: cheaper is to buy 10G switch and put 10G network card into mysql server. Or buy normal gigabit switch and connect mysql box to switch with multiple network cables. In 1G scenario then we give each web server different mysql IP address. I don't think, that mysql box with one 1G link is enough to to satisfy multiple web box mysql traffic. At this moment we have 3 servers witch are running mysql/web. Plan is to add fourth server for mysql only. Thanks. Edit: if we buy 1G switch with mini-GBIC ports. Can we put in mini-GBIC 10G connectors and then connect mysql box to that port?

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  • Migrating SBS 2003 to 2012 standard

    - by AryaW
    My company is currently trying to migrate a Windows Small Business Server 2003 to Windows Server 2012. We know the general procedure, but we want to make sure we aren't going to mess anything up tremendously. Here's the steps we were planning on taking: 1. Uninstall exchange 2. Remove legacy GPO's 3. Demote the domain controller 4. Promote the new server to the primary domain controller. We have no mail servers to worry about. My question is, will the above method work or will we need to make a complete new domain? Thanks!

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  • What is the most suitable way to manage iSCSI storage for Virtual Environments?

    - by Gabriel Talavera
    We are planning to place a HP MSA P2000 with two FC/iSCSI controllers in our network. We have two options to provide more storage to Virtual Machines (We are running Hyper-V): A) Add iSCSI targets to the Virtual Hosts and then create VHD that we would add to each guest server. B) Directly add iSCSI targets in each guest server. Just wondering if one of those options is better than the other, and which is the common practice in a virtualized environment. Thanks in advance for any input!

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  • How hard for a Software Developer to Maintain a Server

    - by Samy
    I'm a software developer and don't have much experience as a sysadmin. I developed a web app and was considering buying a server and hosting the web app on it. Is this a huge undertaking for a web developer? What's the level of difficulty of maintaining a server and keeping up with the latest security patches and all that kind of fun stuff. I'm a single user, and not planning to sell the service to others. Can someone also recommend an OS for my case, and maybe some good learning resources that's concise and not too overwhelming.

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  • Is .htaccess slowing down my dedicated server?

    - by David Robles
    First of all, I consider myself more a programmer than a servers guy. I have a website where I receive about 3,000 visits per day, which I think is a lot less than the max capacity for a dedicated server. However, I've noticed that the connection to the website is pretty slow, e.g., to load images, to connect to it via SSH, etc. I configured .httaccess recently to avoid hotlinking to images in my server (i.e. .jpg, .gif and .png), and I was wondering if that could be slowing down my website. This is the configuration that I have: # BEGIN WordPress <IfModule mod_rewrite.c> RewriteEngine On RewriteBase / RewriteEngine on RewriteCond %{HTTP_REFERER} !^$ RewriteCond %{HTTP_REFERER} !^http://www.mysite.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.mysite.com$ [NC] RewriteRule .*\.(jpg|jpeg|gif|png|bmp|swf)$ http://www.google.com/ [R,NC] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.php [L] </IfModule> # END WordPress I found some code to do that in google, and I just copied to .htacces since I'm not an expert in apache. It works, but I don't know if that is the best way to do it. How can I see if that is the reason why the server is slow? Are there any tools to monitor it? What would you do guys? Thanks in advance!

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  • Using Laptop Screen as a monitor

    - by Kaddy
    I am planning to buy a Mac Mini. I have a Windows laptop and wanted to get a Mac. But my job requires me to move every 3-4 months, so don't want to get a monitor that I will have to carry around all the time. My plan was to get the Mac Mini and use my Windows laptop as a monitor whenever I use the Mac Mini... But i am not sure if this is possible... Maybe some external card or something...? Please let me know if this is possible at all...?

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  • How to get partition information from non-booting server?

    - by gravyface
    Need to manually rebuild a mirrored array on a server and am in the process of reinstalling SBS 2003 on it. However, it's a Dell server, and know that there's the Dell FAT32 diagnostics partition, a system partition, and a data partition, but do not know the size of each. Planning on reinstalling SBS 2003, all applications on the server, and then doing a System State restore, but figured that not having the correct partitions will cause some grief: am I right? Almost thinking that the size of the partitions shouldn't matter, but not positive. Question: should I care about the size of the partition? If so, how can I get this partition information from a non-booting drive? We have an Acronis image of the one working disk and the partitions are mounted/viewable in Explorer on a workstation, but I'm not sure where the Logical Disk Manager/Disk Management data is stored and/or if there's a way to retrieve it without having a working Windows installation.

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  • Maximum disk size for a Debian 6 VMware installation?

    - by Mohamed Abobakr
    I'm planning to install a variety of Linux distributions on VMware Player to get more experience with Linux (I've only used Fedora back in university). I'm starting with Debian 6.0.5 Squeeze, and have already downloaded the small CD i386 netinst image. In the new virtual machine wizard, it's asking me for the maximum disk size of the image. It says that the recommended size for Debian 6 is 8 GB. However, I'm trying to figure out what is the absolute minimal size that I can get away with, since I'm only testing it out with very few software installations (mainly testing web server applications).

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  • CentOS Existing host to new host with all data/files

    - by ganesh
    Good noon. Our small startup management decided to move our production server from existing provider to azure. We have centOS on both. It is for classified's related site, considerable amount of data and ~thousands users with their disc space quota. This is our first time moving our servers. I need your Guidance and suggestions on these. 1) How to migrate the mysql db (dump OR slave OR copy filesystem)? 2) How to manage the emails during the downtime. 3) Manage the files 4) How to security/Firewall check list for the new system 5) IP/DNS related Checklist 6) Anything that I missed out!. Since first time, planning to be more cautious. Any reference documents Highly appreciated. Thank you all!.

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  • tradeoffs of iSCSI vs. AFP when using Time Machine with a NAS?

    - by Ajit George
    I'm setting up a home NAS device (Synology DS409) that I'm planning to use for Time Machine backups (amongst other things). What are the tradeoffs between using iSCSI or AFP to mount the backup volume? The Synology wiki suggests that iSCSI is better if the Mac will be frequently disconnected from the network or sleeping, from the point of view of the volume automatically remounting. What about filesystem consistency? Given that unplugging a USB drive without properly unmounting it often requires the Time Machine volume to be repaired, would iSCSI have the same issues?

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  • How Can I assign an IP address to my virtual Windows Server, so that I can start using it almost as a VPS?

    - by Nelson Symonds
    We are a small office set up with two PC's out of which one of my PCs runs 24hrs. Its almost equivalent to a small server, but right now we're in need of a server which is why I am planning to keep my machine as well as a server into a single PC. I've used VMware Workstation to create a powerful Windows Server 2008 within my PC and I want to attach it to my Network Switch through the same PC where I am hosting it. I want to use it almost like a physical server with an IP address and everything so that I can connect from one Pc to the Server directly or my applications can connect to Server straight with the IP address. How should I do this? Step by step instructions would be appreciated. Thanks in Advance, Best regards Nelson

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  • Laptop battery holds charge, but won't charge any more.

    - by Jeff
    Ok, I'm sure I will need to replace either my battery or my AC adapter, but would rather not buy one if the other is the problem. My problem is. I have a Sager laptop that gets quite a bit of use. The charging has always been a little bit odd. If I was in the process of using it, it would charge just fine and stay On AC power. If I left it alone, however(power settings to ONLY turn off the monitor) in either Ubuntu or Windows 7 it decides that it didn't want to use AC power anymore and would just start draining the battery until it died. Now, suddenly, it won't charge at all. The capacity was great up to this point which happened in an instant. It will recognize the battery but won't see the AC power if plugged in while the battery is in. I can power up the laptop without the battery and it works fine. If I plug in the battery while powered up it will claim it's charging it, but it stays at the same percentage. If I unplug the power, it will switch over to Battery fine, but I have to power down and unplug the battery to get it back on AC power. I've had dying/dead batteries before but they typically won't hold a full charge anymore but it still winds up to 100% then drops quickly when unplugged. This seems more like a chip problem in the battery to me, but I'm not sure. Any ideas?

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  • What is the replacement of the floppy

    - by alexanderpas
    While CD (and to an lesser extend DVD) disks have reached the price-point of the floppy, they have one significant downside, it is WORM (Write-Once Read-Many) media, allowing it to be used only one single time, and you need to be explicit in writing the data to the actual media (you need to burn it.) While CD-RW solves the "use only once" problem, it is still EWORM (Erasable Write-Once Read-Many) media, which still means you need to be explicit in writing the data to the actual media (you still need to burn it.), and also, you still need to be very explicit in erasing it. (simple delete is not possible.) Okay, we can use a CD-RW in Packet Writing mode, however the downside to that, is that this mode is not very universal, and also, not the native mode of the media. Now, while USB-sticks and SD-cards may not have the poblems of the CD, they have a whole other kind of problem: their PRICE! USB-sticks and SD cards are generally 10 to 100 times as expensive as diskettes per piece. SD-cards, in addition have an added problem, because they need a reader to operate. While it is a very standard thing, it is not default equipment on the computer like the CD drive or USB port (or historically the diskette drive). You wouldn't give out an USB stick or SD card with a 100 kB text file, not caring weither you would get it back or not. So, to recap: CD & DVD are basically WORM media. SD cards and USB sticks are relatively expensive. SD cards also needs special readers. Diskettes have a very low data-rate Diskettes have a very low storage capacity. Now, is there a media out there that solves all these problems, or is there a way to get (very) small USB sticks or SD cards for a very low price (as they're the closest thing to diskette).

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  • Windows 7 mapped drive kicking off OS X users

    - by Collin White
    I've mapped a network drive on my Windows 7 PC at my office. The windows machine has a few TB of storage that is being accessed by my development team (all running mac os 10.7). The share seems to work fine for a little while but will timeout and kick the mac users off and sometimes disallows a connection on the next attempt. Restarting the windows machine fixes the problem. I've tried this tutorial as well as setting the maximum session length in the Local Security Policy section to 99999 (I discovered 0 did not mean unlimited, only a 'reasonable ammount of time') anyway, the setting is now for ~208 days which is sufficient (see attached). I'm having trouble debugging this in general so if anyone has some pointers I'm all ears. This is a intermittent issue which in my opinion are the hardest kinds to debug. If anyone knows of how I might monitor connections from the PC that would also be pretty cool. Previously the files were hosted on a mac mini and everything was working just fine (the mini just didn't have the ability for the storage capacity we needed) so I believe it is some windows setting that is kicking users off. Anyway, thanks for reading.

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