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• Servers - Buying New vs Buying Second-hand

  - by Django Reinhardt

  We're currently in the process of adding additional servers to our website. We have a pretty simple topology planned: A Firewall/Router Server infront of a Web Application Server and Database Server. Here's a simple (and technically incorrect) diagram that I used in a previous question to illustrate what I mean: We're now wondering about the specs of our two new machines (the Web App and Firewall servers) and whether we can get away with buying a couple of old servers. (Note: Both machines will be running Windows Server 2008 R2.) We're not too concerned about our Firewall/Router server as we're pretty sure it won't be taxed too heavily, but we are interested in our Web App server. I realise that answering this type of question is really difficult without a ton of specifics on users, bandwidth, concurrent sessions, etc, etc., so I just want to focus on the general wisdom on buying old versus new. I had originally specced a new Dell PowerEdge R300 (1U Rack) for our company. In short, because we're going to be caching as much data as possible, I focussed on Processor Speed and Memory: Quad-Core Intel Xeon X3323 2.5Ghz (2x3M Cache) 1333Mhz FSB 16GB DDR2 667Mhz But when I was looking for a cheap second-hand machine for our Firewall/Router, I came across several machines that made our engineer ask a very reasonable question: If we stuck a boat load of RAM in this thing, wouldn't it do for the Web App Server and save us a ton of money in the process? For example, what about a second-hand machine with the following specs: 2x Dual-Core AMD Opteron 2218 2.6Ghz (2MB Cache) 1000Mhz HT 16GB DDR2 667Mhz Would it really be comparable with the more expensive (new) server above? Our engineer postulated that the reason companies upgrade their servers to newer processors is often because they want to reduce their power costs, and that a 2.6Ghz processor was still a 2.6Ghz processor, no matter when it was made. Benchmarks on various sites don't really support this theory, but I was wondering what server admin thought. Thanks for any advice.

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• Is a Hostname A Entry necessary?

  - by Citizen

  When I log into WHM, I get this message: The server was unable to lookup an an A entry for its hostname (server226.taxi.com). This is generally because the entry was never added. However this could also be the result of your nameserver(s) being down. If you would like to attempt to automatically add the entry, click here. If I click "here" it does nothing and I still get the message. I'm not hosting websites for other people, just internal projects on our server. Does not having an A Hostname Record affect SEO or anything like that or is this just a convenience when setting up nameservers or something like that?

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• Recovering database files from a corrupted VHD

  - by Apocalypse9

  We have a SQL server hosted on a virtual machine. Our hosting company updated/restarted the server and for some reason the virtual machines became unbootable. We've spoken to Microsoft and used a few higher level tools to attempt to recover the virtual machines but were unsuccessful. In browsing the file system the database folder doesn't even appear. I'm wondering if there are any lower level tools that might be able to find and copy the database files. As far as I know the physical hard drive is ok, so I'm hoping there may be some way to recover the files themselves even if the rest of the virtual machine file-system is a loss. Obviously we're in a bit of a bind, and any help/ suggestions are very much appreciated.

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• Different configurations for ssh client depending on ip address or hostname

  - by John Smith Optional

  I have this in my ~/.ssh/config directory: Host 12.34.56.78 IdentityFile ~/.ssh/my_identity_file When I ssh to 12.34.56.78, everything works fine. I'm asked for the passphrase for "my_identity_file" and I can connect to the server. However, sometimes I'd also like to ssh to another server. But whatever the server, if I do: ssh [email protected] I'm also asked for the passphrase for "my_identity_file" (even though the server has a different ip address). This is very annoying because I don't have the public key for this file set up on all my servers. I'd like to connect to this other server (an old shared hosting account) with a password, and now I cant. How do I manage to use the key authentication only with one server, and keep using password by default for servers that aren't listed in my ~/.ssh/config ? Thanks for your help.

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• Default documentroot apache does not work

  - by James Wise

  I have apache version 2.2 and php 5.3.15 on a single server. I configured virtual hosting and a default vhost. 0_default_.conf - goes to /var/www/default sub.domain.com.conf - goes to /var/www/sub.domain.com My question is, how could I set the default documentroot to sub.domain.com permanently? That means all request should be redirected to sub.domain.com. I try to remove 0_default_.conf but when viewing the page it display the php source code of sub.domain.com. Here is my configurations -- http://pastebin.com/4e3awUJ4 Although I can create index.php to /var/www/default and permanently redirect to sub.domain.com site but it's not viable solution for me because what if I didn't point the ip address of sub.domain.com to the server so user cannot view that subdomain. I would appreciate if anyone could share their knowledge and wisdom. Thanks. JamesW

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• WordPress issues with htaccess causing 500 server error

  - by Scott B

  I have a few customers of my custom wordpress theme that are reporting that their sites have went down over the past few weeks due to a 500 internal server error. In each case, it appears that the htaccess file has been to blame. In one case, the user's hosting company found a "_pvt/service.pwd" line in there that was apparently causing the problem. In another instance, the hosting company indicated that a chron job appeared to be causing the issue and sent the user the following as evidence... root@cherry [/home/login/public_html]# stat .htaccess File: `.htaccess.orig' Size: 587 Blocks: 8 IO Block: 4096 regular file Device: 811h/2065d Inode: 590021607 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 2234/login) Gid: ( 2231/login) Access: 2010-03-07 16:42:01.000000000 -0600 Modify: 2010-03-26 09:15:15.000000000 -0500 Change: 2010-03-26 09:45:05.000000000 -0500 In yet another instance, the user reported this as the cause... The permissions on my .index file somehow got changed to 777 instead of 644 I'm just seeking to help these users understand what's going on, the likely cause and how to prevent it. I also want to eliminate my theme as a potential contributing factor. I have two areas in which I want to submit here to make sure that they are not likely to cause such an issue. They are my permalink rewrite code as well as my upgrade script (which sets 755 on the destination folder (my theme folder). Here's the permalink rewrite code... if (file_exists(ABSPATH.'/wp-admin/includes/taxonomy.php')) { require_once(ABSPATH.'/wp-admin/includes/taxonomy.php'); if(get_option('permalink_structure') !== "/%postname%/" || get_option('mycustomtheme_permalinks') !=="/%postname%/") { $mycustomtheme_permalinks = get_option('mycustomtheme_permalinks'); require_once(ABSPATH . '/wp-admin/includes/misc.php'); require_once(ABSPATH . '/wp-admin/includes/file.php'); global $wp_rewrite; $wp_rewrite->set_permalink_structure($mycustomtheme_permalinks); $wp_rewrite->flush_rules(); } if(!get_cat_ID('topMenu')){wp_create_category('topMenu');} if(!get_cat_ID('hidden')){wp_create_category('hidden');} if(!get_cat_ID('noads')){wp_create_category('noads');} } if (!is_dir(ABSPATH.'wp-content/uploads')) { mkdir(ABSPATH.'wp-content/uploads'); } And here is the relevant lines from my uploader script... // permission settings for newly created folders $chmod = 0755; // Ensures that the correct file was chosen $accepted_types = array('application/zip', 'application/x-zip-compressed', 'multipart/x-zip', 'application/s-compressed'); foreach($accepted_types as $mime_type) { if($mime_type == $type) { $okay = true; break; } } //Safari and Chrome don't register zip mime types. Something better could be used here. $okay = strtolower($name[1]) == 'zip' ? true: false; if(!$okay) { die("This upgrader requires a zip file. Please make sure your file is a valid zip file with a .zip extension"); } //mkdir($target); $saved_file_location = $target . $filename; if(move_uploaded_file($source, $saved_file_location)) { openZip($saved_file_location); } else { die("There was a problem. Sorry!"); }

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• How to run nodejs on linux platform

  - by rotem

  How to run node.js on host with linux platform? To run node.js on localhost with windows operation system is simple I download package from nodejs.org/download/ and I execute Windows Installer (.msi) I go to console command line and I type node file.js and everything fine. but in my host with linux platform I have control panel with no option to run type file exe, msi and there is no window with command line, So how can I be able to run nodejs on my host? I call to support of my hosting bluehost.com and they don't know. my Details server and control panel Thanks for any help

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• Multi domain server with dedicated SSL's HA

  - by user3692800

  I am hosting a server with 150 domain names (websites), each of the ssl's requere dedicated IP address. So server windows 2008, with 150 IP addressees and 150 websites. I need to have high availability solution. So thinking setting up AWS but ELB will not be a solution... and max IP's I can get per instance is 12 addresses. So what can I do to have all 150 sites hosted on one instance and be HA with instance in different availability zone.

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• How to connect to Google App Engine server in internal network iMac?

  - by Will Merydith

  I have 3 iMacs and a Windows machine on my home network, all connected via an Airport Extreme router. I'm developing Google App Engine applications locally on one of the iMacs, and can view applications using http://localhost:8080 (or whatever port I choose). How do I connect to those applications from other iMacs and Windows machines in my network? I've located the IP for the iMac hosting Google App Engine: 10.0.1.7. But when I try http://10.0.1.7:8080 from another machine it will not load the page.

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• Is there a Linux kernel boot parameter to configure an IPv6 address?

  - by aef

  I know there is a parameter named ip which lets you configure IPv4 addresses on the Linux kernel through the boot loader. That looks like the following: ip=192.0.2.1::192.0.2.62:255.255.255.192::eth0:none I'm looking for an equal parameter for IPv6 configuration. I couldn't find anything about this in the kernel documentations. Update: Because of a lot of you asked why I would need this: The idea to use a kernel configuration came up related to this problem. I suspect the regular boot-up interface configuration is not done, because the interfaces are already up. The reason for this could be that I'm using a pre-boot environment with a Dropbear SSH server to allow me to unlock my encrypted root partition. The IP addresses for this environment are configured through GRUB with the ip= parameter. There is no DHCP or Router Advertisement available on that Ethernet segment and as this is the uplink segment provided by a large hosting company, there is no way to change that fact.

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• Cannot install windows. Compaq Presario CQ62

  - by Matthew

  I bought a used Compaq Presario CQ62 for cheap, and went to install windows on it. I formatted the partition and went to install when I got this error.... Windows cannot install required files. The file may be corrupt or missing. Make sure all files required for installation are available and restart the installation. Error code: 0x80070017 I have used this disk before with no problems, but internet searching suggested I burn one at 2x speed because that helps for some reason... I'm burning one now, but my question is, why would I get this error, OTHER than the disc being bad? I'm pretty certain this one isn't as I have used it before... (ok so the slowly burned cd (using imgburn) didn't work either so it's DEFINITELY not the disc) Thanks in advanced for any answers Also I took one stick of ram out because internet searching also suggested that, but it didn't make a difference. Also I ran memory and hard drive checks and they passed fine. Also I reset the motherboard options to default What could it be!? Help I'm completely stumped...

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• Domain controller in cloud, how do we set up local BDC

  - by brian b

  We have a domain controller (exchange box) hosted at our hosting provider. We need to set up a local domain controller so we do a VPN and local authentication tasks. I can make the PDC accept all connections from our Office IP. How do I get the office router to correctly allow two way communications between the PDC (cloud) and the local DC. Is there a list of ports I need to pass through to the local DC? Thanks! "PDC" and "BDC" used for clarity--I know that the concept is obsolete.

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• Browser considering www domain and without www domain different

  - by user1444680

  I've bought a domain name and hosted it. My browser is storing separate passwords for mydomain.com and www.mydomain.com, and also caching them separately. I want these two to be considered the same website. The zone records of mydomain.com are: "A" record: "@" points to the IP address of my hosting CNAME: www points to "@" As CNAME signifies alias, shouldn't browser understand (like search engines do) that the two URLs refer to the same website? Is it browser's fault? Please tell how to correct the problem? Do I need to enter some other record for www instead of CNAME?

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• Linux: how to verify my network configuration before doing a restart

  - by wael34218

  I am trying to build a network bridge for my VMs on a server. So I added a new file and changed another in the /etc/sysconfig/network-scripts directory. Then I did a network reboot with the following command:/etc/init.d/network restart After that the server was not up again. I contacted the hosting provider's support for help. I need a way to verify my new configuration before a network restart. I need to make sure that it will be up again, just like apache's /etc/init.d/httpd configtest

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• Can you have a staging and production slot in Azure Websites

  - by Barry King

  I'm looking at hosting 3 Websites (there will all use the same linked database resource but I think I have to use 3 websites within Azure for this); www.website.com, provider.website.com and admin.website.com. Using Windows Azure Websites, can you have a Staging, Production slot? I think this feature is only available to Azure Cloud Services but there is little documentation on this. If its not possible, other than spinning up 3 more sites to act as the staging sites is there another way? I want the ability to "swap" from staging to production.

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• How can I tell if my live web-server is overloaded?

  - by Nick G

  We have a live webserver which doesn't seem to be performing all that well. It's a Dell PowerEdge machine, a few years old (dual core, 4GB) which is hosting about 20 low-traffic websites. However it doesn't seem to be as fast as it used to be. How can we determine the cause of this? If it's website traffic, I would be expecting high CPU but CPU usage is quite low and hovers around the 15-30% mark except for very brief periods. I'm wondering perhaps, if rather than CPU performance being a problem, perhaps it's disk thrashing due to the constant read/writes of all the small web files and database queries. It has 4x 7200 RPM SATA drives in RAID 5. So is there a way to check that it's not disk thrashing?

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• Stop sending packets to private IPs

  - by SlasherZ

  I have a problem that my server got locked down because it was sending packets to private IPs. My question is, what is the best solution to stop that? Here is the log that I got from my hosting provider: [Mon Jun 2 00:04:36 2014] forward-to-private:IN=br0 OUT=br0 PHYSIN=vm-44487.0 PHYSOUT=eth0 MAC=78:fe:3d:47:3d:20:00:1c:14:01:4e:cd:08:00 SRC=78.46.198.21 DST=192.168.249.128 LEN=1454 TOS=0x00 PREC=0x00 TTL=64 ID=58859 DF PROTO=UDP SPT=41366 DPT=41234 LEN=1434 [Mon Jun 2 00:17:15 2014] forward-to-private:IN=br0 OUT=br0 PHYSIN=vm-44487.0 PHYSOUT=eth0 MAC=78:fe:3d:47:3d:20:00:1c:14:01:4e:cd:08:00 SRC=78.46.198.21 DST=192.168.249.128 LEN=1456 TOS=0x00 PREC=0x00 TTL=64 ID=52234 DF PROTO=UDP SPT=55430 DPT=41234 LEN=1436

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• What exactly is an invalid HTTP_HOST header

  - by rolling stone

  I've implemented Django's relatively new allowed hosts setting, which is meant to prevent attackers from submitting requests with a fake HTTP Host header. Since adding that setting, I now get anywhere from 20-100 emails a day notifying me of invalid HTTP_HOST headers. I've copied in an example of a typical error message below. I'm hosting my site on EC2, and am relatively new to setting up/maintaining a server, so my question is what exactly is happening here, and what is the best way to manage these invalid and I assume malicious requests? [Django] ERROR: Invalid HTTP_HOST header: 'www.launchastartup.com'.You may need to add u'www.launchastartup.com' to ALLOWED_HOSTS.

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• How to exclude IP from htaccess domain redirect

  - by ijujym

  I'm trying to write a custom redirect rule for some testing purposes on 2 domains with exactly same site. The code I am using is: RewriteEngine on RewriteCond %{REMOTE_ADDR} !^1\.2\.3\.4$ RewriteCond %{HTTP_HOST} ^.*site1.com [NC] RewriteRule ^(.*)$ http://www.site2.com/$1 [R=301,L] What I want is to redirect all requests for site1 to site2 except for requests from IP address 1.2.3.4. But currently requests from that IP are also being redirected to site2. Is there something I've missed in settings? ( note: both domains are on the same shared hosting account )

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• Setting up a copy of a site with IIS 7?

  - by SJaguar13

  I have a site running on IIS with a dyndns.org domain that points to the IP of the Windows 2008 machine hosting it. I need a copy of that site for development purposes. I set up another folder with all the files, and create a new site in IIS. I don't really have a domain for it, so I was just going to use the IP address. When I go to localhost, 127.0.0.1, or the internal IP, I get bad hostname. If I use the IP address on port 80 (the same as the real version of the site), I get 404 not found. If I use a different port so I don't have them both on the same IP with the same port, I get connection timed out. How do I go about setting this up?

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• GitHub Not Accessible from Google Chrome

  - by KPthunder

  Whenever I try to go to GitHub through Google Chrome 11 I get the following error message: GitHub works perfectly fine in Firefox 4: This has been going on for a few weeks. This is a fairly new install of Windows (I don't even remember if I've successfully got on to GitHub on this installation with Chrome in the past). I don't even use GitHub for hosting my own code personally, but this has proven annoying in that I can't even access other people's projects through Chrome! Does anybody know what is going on here? An interesting side note: The Sight extension for Chrome doesn't work either! It worked on my old installation of Windows but not on this one. Is my Chrome installation just screwy? I've tried disabling certain other extensions but nothing seems to change.

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• Disable IPv6 on Debian VPS

  - by chris_l

  I have a Debian Lenny VPS, that's running virtualized by Parallels/Virtuozzo. Currently, the network interface doesn't have an IPv6 address - and that's good, because I don't have an ip6tables configuration. But I assume, that I could wake up one day, and ifconfig will show me an ipv6 address for the interface - because I have no control over the kernel or its modules - they're under the control of the hosting company. That would leave the server completely vulnerable to attacks from IPv6 addresses. What would be the best way to disable IPv6 (for the interface or maybe for the entire host)? Usually I would simply disable the kernel module, but that's not possible in this case.

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• RemoteApps and Cached Credentials

  - by user66774

  I'm looking for a guidance on an issue we're having. We are hosting an application over terminal services through RDWeb on Windows 2008 Server. To give users the ability to change their password we've exposed the iisadmpwd to allow the users to change their passwords. When the users change their password, they are prompted to log into broker server, even if they log off of the RDWeb page and log back in. What we've found is that the credentials seem to be cached in memory after logging in. Ending task on TSWBPRXY.EXE, WKSPRT.EXE, closing IE and logging back into the RDWEb page, then launching the application allows the user to log into the application without additional credentials. I'm wondering if there is a better way to either have the user change their password from a web interface, but allow them to reestablish their connection from the RDWeb login page rather than through the RDP login prompt that comes up.

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• Network Sniffing and Hubs

  - by Chris_K

  This will likely seem naive to the experts... but it has been on my mind lately. For years I've been using ntop and a cheap 4 port hub to sniff client networks to determine who's doing what -- and how much. Great way to see what's going on when they call and say "Geeze, the network seems really slow today." No need to bring in a managed switch (or access the existing one) and no need to configure spanning or mirroring. I just drop in the hub inline where I want to measure. Lately I noticed it is just about impossible to buy a real honest-to-goodness hub anymore. While looking for a new one, I had someone tell me that I should be sure to get a full-duplex hub or I'd only be seeing half the traffic when I monitor. Really? I've been using a crusty old Netgear DS104 all this time. No clue if it is half or FD. Have I really been understating my measurements? I'm just not bright enough about the physical layer to really know... Side note: Just ordered a Dualcomm Ethernet Switch TAP as a hub replacement. Seems like a nifty gadget. Any notes or tips about it would be welcome in the comments :-)

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• Hyper-V Server 2008 Configuration

  - by Eternal21

  I need to set-up Lync on a Server 2008 machine. The problem is that Lync cannot be set up on a Domain Controller. That means I need to have one Server 2008 that's a domain controller and another that's Server 2008 running Lync. I figured the best way would be hosting it on a single machine, using virtual machines. I installed Server 2008, but now my question is this. Do I add two virtual machines (Domain Controller and Lync), or do I only add one virtual machine for Lync, and the 'parent' Server 2008 can act as a domain controller?

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