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• University Assignment: Datacenter/Networking Infrastructure for Hosting Company [closed]

  - by TCB13

  My university assigned me to theorizing a data center for an Web Hosting company. The company should provide the following services: Shared WebHosting; Dedicated Servers; VPS (Virtual Private Server); The bandwith (as resquested) is limited to 10 Gbps. Is there any good book / other info I can read (max 100 pages) about how to design a good data center for hosting, what are the best practices and what should be done from a (logical) network perspective, what security policies should be implemented and how the data center should be built (physically)? Thank you ;)

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• How do you manage updates without a staging environment: CentOS 6.3

  - by Gregg Leventhal

  I am managing about 20 servers, many of them virtual. They are almost all different purpose, and none are clustered. I have a distributed LAMP stack, a few application servers, some build servers, a few KVM hosts. They are CentOS 6.3 mostly with a few Ubuntu (unfortunately). I don't have the resources to setup a staging environment where I can have duplicates of my machines and test updates before rolling them out. I am taking file backups. What I want to know is how you are approaching backing up your Linux systems. I assume you don't just do yum update, but then how are you choosing the packages worthy of updating? When (if ever) are you updating the kernel, etc.. How do you test updates without a staging environment? Snapshot and hope for the best?

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• How do you have one IP address and many websites?

  - by johnny

  Hi, How can I have it where I have one IP address that sits on the Internet but many web names? For example, when a hosting company has a shared IP but I get unlimited domain names (along with everyone else on that box). I have a box on the Internet but I want to point to another machine that holds a different website when someone types in the different www...(it's sitting right next to it in just a different box). Is that all subdomaining? Thank you. EDIT: I am the hosting company.

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• Reverse DNS for two ADs in the same subnet

  - by SpacemanSpiff

  I currently have two separate AD forests that exist within the same subnet. The two forests have independent copies of the reverse lookup zone for that subnet. Example: Domain A DC1: 10.1.1.1/24 Domain A DC2: 10.1.1.2/24 Domain A AppServer1:10.1.1.3/24 Domain B DC1: 10.1.1.11/24 Domain B DC2: 10.1.1.12/24 Domain B Appserver1:10.1.1.13/24 What I'm after, is a configuration that allows this reverse zone to be shared between them so that both sets of DNS servers can make updates to the zone. This kind of thing is a little far from my everday work, so a kick in the right direction is a welcome suggestion as well. Decoupling one AD into new segments is a possibility I'm open to but would like to avoid if possible. If there is a DNS related solution I'd prefer that.

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• ntbackup workalike for adhoc full backups in Windows 7 thats free and preferably open source

  - by Justin Dearing

  On windows 2000 and XP machines I used to be able to do the following: ntbackup backup systemstate c: /f e:\backups\machineName\machineName-full+systemstate_200101206.bkf This gave me a full backup of the system that I could use to do a system restore, after doing a barebones OS install. Windows 7 has a great utility for regular backups with alerting and all that stuff. It does not seem to have command line support. I'd like a backup solution for my Windwos 7 systems that has the following features: Is free Is open source (preferebly) Works while the system is booted and leaves the system functional (clonezilla is great for offline backups, and I use that too) Gives me a backup that is suited for a full system restore or partial system restore (ruling out most imaging software even if they could work while the system is booted via some sort of shadow copy voodoo) Can work via the command line Compression would be nice, the ability to pipe output would be better.

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• IIS Hangs on SQL Connections when running ASP.net applications

  - by PaulWaldman

  We have a database server running SQL 2000 and two web servers hosting ASP.net applications. All three servers are running Windows Server 2003 SP2. Our issue is repeatable after about 2 weeks, IIS on one web server is no longer able to establish SQL connections. Static content loads fine. Other non-IIS applications are still able to contact the SQL database server. ODBC functionality also still works. While running SQL profiler a connection is never established from IIS when it is in this state. The only way to fix this situation is to restart the web server. There are no firewalls installed on any machines.

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• Import virtualBox appliance to KVM

  - by Hugo Bulnes

  Im new using KVM as a virtualization solution. Currently I'm using VirtualBox to manage my virtual machines in my personal computer, but I'm moving my virtualization to a Server, so I set up a Linux server with KVM. And now I'm trying to import a virtualBox vm to KVM. So far I couldn't make it work. I already convert the ova file from VirtualBox to a format more familiar to KVM (qcow2), and I try to create a new virtual machine using virt-install command and setting the new virtual machine hard drive with the .qcow2 file. There is anyone could help me? thank you!

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• Securing a persistent reverse SSH connection for management

  - by bVector

  I am deploying demo Ubuntu 10.04 LTS servers in environments I do not control and would like to have an easy and secure way to administer these machines without having to have the destination firewall forward port 22 for SSH access. I've found a few guides to do this with reverse port (e.g. howtoforge reverse ssh tunneling guide) but I'm concerned with security of the stored ssh credentials required for the tunnel to be opened automatically. If the machine is compromised (primary concern is physical access to the machine is out of my control) how can I stop someone from using the stored credentials to poke around in the reverse ssh tunnel target machine? Is it possible to secure this setup, or would you suggest an alternate method?

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• How to push to github from a server account with multiple users?

  - by kirdie

  We have a web server which contains a web application stored as a github project. Now all of us can push from our local machines to github and then pull on the server but sometimes we want to make small changes and immediately see the effect so it would be great to be able to push at the server too. Now I created an ssh key for the server but I don't want to add the servers ssh key to my github account because then all github actions done from the server are counted to my account. Is it possible to add the ssh key to the github web application project without creating a new user for the server and what is the best practice for this situation? I also don't want to copy my private key to the server obviously.

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• How do I make a USB stick from which to install different OS's?

  - by Hanno Fietz

  Recently, I have made a number of USB sticks to install OS's (several Linux flavors, BSD, Windows) from, on machines that didn't have CD drives. Now, I would prefer to not overwrite the install USB sticks all the time, since it's handy to have them, but neither do I want to pile up USB sticks that I only need every 6 months. It would be great to have a bootable USB stick that fires up some minimal system, lets you choose an ISO image and then reboots from there. How would I go about this? Do I use some minimal Linux? Is there some kind of modified / specialized boot loader? Can I set up GRUB to do this? Should I use virtualization?

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• How do I create certificates for both ends of an stunnel connection?

  - by unixman83

  Hi. I am using stunnel to authenticate RDP (Remote Desktop) and I need to verify that a client possesses the proper credentials. So people cannot brute force into the machine. I am also using a bad (outdated) version of RDP that has security vulnerabilities, so stunnel is a must. I will preshare the necessary .pem's between machines. What are the openssl commands I need to create the right .pem files on both the client and on the server? What files need to be shared?

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• Restarting rsyslog re-sends logs again

  - by Jay Taylor

  I am running Ubuntu 12.04.1 LTS on EC2. I have a bunch of application servers which are configured to forward their logs to a central server via rsyslog. Since putting in Nagios monitoring on the log files on the central server, I've been getting alerts indicating that particular application servers are failing to forward their logs to the centralized server. Logging into the machines and restarting the rsyslog service fixes the problem. However, rsyslog then re-transmits the logs again, resulting in duplicates on the collector. Why is it doing this?

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• Virtual OS using same Wallpaper as Host

  - by Jeff

  Greetings, I'm running a guest Linux OS on top of Windows XP, which rotates its wallpapers using the PowerToy Wallpaper Changer. I'm hoping for a way for my guest OS to somehow detect which wallpaper the host is using, and automatically switch to it. Why? Because if I run my guest OS in seamless mode and have transparent windows, I want the transparent background to match the host OS. It looks nice that way :). A couple tidbits of relevant information: Guest OS is Peppermint Ice (Ubuntu based) Host OS is Windows XP VirtualBox as virtualization software I realize this is somewhat breaking borders between the host and the guest, but I want my pretty rotating wallpaper! I'm guessing there is a way using scripts and shared folders or something similar, if not by means of just querying the host OS.

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• Domain pointing to wrong subscription in Plesk 10

  - by Michal Gow

  I recently moved a domain name in the Plesk 10 control panel from one subscription to another. DNS is managed by another server so there is no change in DNS at all. The IP address is shared and remains the same so there is really no need for a DNS change. But the domain is still managed by its former subscription (where it should have been removed from) and is pointing to exactly the same folder as in the past, even when is not in the list of domains there. Subsequently, the new subscription do not have the domain under its control. Even this domain is in list of domains here and points to another folder.

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• Recommended SMTP Relay Service [closed]

  - by Ryan

  I've got a legacy application that needs an smtp server to relay emails. Each client has various control over their IT infrastructures (from little to none at all), so I can't necessarily install an smtp server on each of their machines. Can anyone recommend a basic SMTP Relay Service? Its literally only for sending a couple of emails a day to a list of about 20 users per client. The application only allows for the smtp server and to/from addresses to be specified. I'm assuming its using the default port. Thanks!

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• General High-Level Assessment

  - by tcarper

  Guys and Gals, I've been tasked with a doozy of an assignment. The objective is something akin to "laying of hands" on several database servers which work in concert to provide data to various Web, Client-Server and Tablet-Sync'd distributed Client-Server programs. More specifically, I've been asked to come up with a "Maintenance Plan" which includes recommendations for future work to improve these machines' performance/reliability/security/etc. Might there be some good articles on teh interwebs ya'll could point me towards which would give me some good basis to start? Articles describing "These are the top 4 overarching categories and this is how you should proceed when drilling down on each of them" sort-of-thing would be fabulous. The Databases are all SQL 2005, however the compatibility level is 80 and they were originally created with ERwin based on SQL 6.5. The OSs are all Windows Server 2003. Thanks all! Tim

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• Internet Time tab has disappeared from the Date and Time applet of the Control Panel

  - by Robert Thornton

  Previously, there was an Internet Time tab on the Date and Time applet of the Control Panel, wherein one could force a query of an internet time server and also type in a different server from the ones supplied. However, this tab has now disappeared, and I need to have it back. I should mention that this machine has never been part of a domain, since it seems that machines that are such do not have such a tab. I should be obliged to anyone who can help me restore the missing tab. Windows 7 Home Premium Service Pack 1

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• Help with putting Ubuntu on an old laptop

  - by alex

  Hi I dusted off an old laptop from 2004 which has Windows XP. I want to put Ubuntu on it. So, I downloaded the CD image and then burnt it to a disc. I tried starting the laptop and booting from CD but no luck. The CD drive doesn't work in the laptop anymore! So I shared the files on the local server and then accessed the wubi.exe file from within Windows XP, and it proceeded to download something else and install. It then asked me to restart, which I did. I now have a folder C:\ubuntu with a bunch of files in it. How do I get the option to boot to Ubuntu? Sorry, I have never installed a Linux variant before! Many thanks

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• Benefits of log rotation

  - by Manfred Moser

  I have been using logrotation for years and never thought too much of it being a problem until I came across a question on stackoverflow (http://stackoverflow.com/questions/1508734/disable-java-log-rotation/) where someone wants to disable log rotation. To me with experience in having build server and even production servers cleaned up manually because logs are not rotated and discs are running out and suddenly machines come to a halt that all seems crazy, but it occurred to me that maybe it is not so obvious after all. So what are the benefits of log rotation? And what are the drawbacks (e.g. more difficult to debug/analyze maybe)? What tools do you find useful for working with rotated log files? Splunk I assume, but what else?

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• Linux IPv6: DHCP and /127 prefixes

  - by Jeff Ferland

  I've tried multiple pieces of DHCP client and software in attempting to setup a solution for allocating a /127 prefix to virtual machines so that each maintains its own layer 2 isolation. Because there would only be one host assigned to each network, a /64 is impractical. While the prefix size could reasonably be somewhere in the /64-127 range, the crux of the problem has been the same regardless of the software used in configuring: the DHCP call to bring up the interface uses the address advertised by DHCPv6 and inserts two routes: the /127 given by the router advertising packets and a /64 as well. Any thoughts on why I'm getting the additional route added across dhcp client vendors?

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• bridge to share WiFi internet connection over eth0

  - by rubo77

  In this script there is implemented that you create a mesh network and connect other machines to your device to serve an internet connection with dhcp: echo "starting bridge to share internet connection over eth0" ifconfig eth0 up promisc brctl addbr br-freifunk brctl addif br-freifunk bat0 brctl addif br-freifunk eth0 echo "internet starting, this may take some minutes due to latency..." echo "(use" echo "tail -f /var/log/syslog" echo "in another window for debugging)" echo echo dhclient br-freifunk echo "The error 'Rather than invoking init scripts through /etc/init.d...' can be ignored:" dhclient br-freifunk # without bridge: dhclient bat0 This works fine with the freifunk-mesh network. But how can I serve internet in a normal case? I would like to connect to any open Wifi I find with my network-manager or wicd (yes, with the graphical GUI) and then start a small script that creates a bridge to my network-out on my laptop I use Ubuntu and my networkcards are eth0 and wlan0

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• Converting DOCX files to PDF via SSH without losing formatting

  - by Reado

  I'm struggling to find a solution that will allow me to convert a DOCX file to a PDF without losing or malforming the formatting of the document on CentOS 5.7. I have tried CUPS-PDF but it doesn't work; spool files appear in the /var/spool folder but nothing happens after that. OpenOffice and LibreOffice converted a DOCX to PDF but the formatting was all wrong. However if I print the DOCX to a Windows PDF printer from my Windows 7 workstation, it outputs to PDF absolutely fine. So why can't Linux do the same? I tried to print via CUPS to the Windows PDF printer (shared) but the document appears in the queue as "Remote Downlevel Document" and doesn't print. This only happens when I print from Linux.

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• Can you shrink the sparse disk image of a Mac OS X guest OS in VMWare Fusion?

  - by Paul D. Waite

  I use VMWare Fusion on my Mac to run a virtual Windows 7 machine, and the Microsoft IE compatibility Windows XP virtual machines. In VMWare Tools on the Windows guest OSes, there’s a “Shrink” option that lets you reduce the size of the sparse disk image used by the guest OS, to save hard drive space on your host OX. I’ve recently created another virtual machine, this time running Snow Leopard Server. I was wondering if I could shrink the spare disk image used by this machine too, but I can’t find a VMWare Tools app on the Mac guest OS, even though VMWare Tools have been installed (as VMWare’s Shared Folders feature is working). Is there any way to shrink the sparse disk image used by Mac OS X guest OSes in VMWare Fusion?

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• iSCSI SAN RAID 10 Performance -- Poor Read, Good Write

  - by Litzner

  I have a EqualLogic PS4000 SAN unit with the latest firmware, setup in RAID 10. I have 3 2TB Volumes on the SAN shared out via iSCSI on 2 eth ports on two different subnets. I have moved a test server over to this newly setup SAN, and my testing is showing me a problem. I am getting dismal read performance in everything except a test with 32 queue depth (see attach image) Write performance seems to be right about where it should be. I have tried MPIO on and off, on was slightly better but not much.

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• Cannot connect to telnet server

  - by BloodPhilia

  So, I can't use telnet to connect to any server but it works fine from a different computer. It just says it can't connect. I tried the following things: Disable firewall and AV protection. (Basically, there was no security feature left online) Telnet is set to "Trusted" in my AV protection. (Kaspersky Internet Security 2011) Using Putty to telnet, but apparently Putty's connection is also inhibited. (Says it can't connect to host) Disabling the telnet client in Control Panel and then re-enabling it. (Windows 7 Ultimate) hosts file is clean. Checked for nasties using MBAM and KIS 2011 as well as going though my HijackThis logs, nothing found. I can connect to the same machines/servers through the web browser, ping, tracert, etc. Only telnet seems to be blocked. Any other thoughts?

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