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• TCP/IP performance tuning under KVM/Qemu

  - by vpetersson

  With more and more companies switching to public cloud services, I'm curious what you guys' thoughts are on TCP/IP tuning in the cloud. Is it worth bothering with? Given that you don't have access to the host-server, you're somewhat limited I presume Let's say for the sake of the argument that you're running three MongoDB-servers in a replica-set on FreeBSD or Linux that all sync over an internal network. I'd also be curious if anyone made any actual performance benchmarks to back up their arguments. I benchmarked the various network drivers available for KVM/Qemu here, but I'm curious what the gurus here suggest to tune further. I started playing around a bit with the tuning-recommendations as suggested over here, but interestingly enough I saw a decrease in performance, rather than an increase, but perhaps I didn't fully understand the tweaks. Update: I did a few more benchmarks and posted the result here. Unfortunately the result wasn't really what I expected.

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• kloxo setup error

  - by ron

  Hi, i've just purchased vps from 2host, its unmanaged. the support told me to install kloxo. However i got the ff errors in step 1: --begin-- root@vpshostingtips:~# wget http:// download.lxlabs . com/download/kloxo/production/kloxo-install-master.sh --2010-05-06 04:17:04-- http:// download.lxlabs . com/download/kloxo/production/kloxo-inst all-master.sh Resolving download.lxlabs.com... failed: Temporary failure in name resolution. wget: unable to resolve host address `download.lxlabs.com' root@vpshostingtips:~# --end-- Note: i split the hyperlinks intentionally to post here can somebody tell me whats the reason for error? sorry so new to vps.

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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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• Can't access LAN computers with SSH

  - by endolith

  I got a new Windows 7 machine, and was using VNC,SSH etc to connect to my Ubuntu machine, and it worked fine previously. Now it doesn't work if I use the machine's hostname or local IP, but if I use the DynDNS name, it works. I can also access it from my Android phone using the local hostname over SSH. If I try to connect with SSH to the hostname, it says "Host does not exist". VNC says "Failed to get server address". NX says "no address associated with name", and I don't see it in Windows' "Network" folder. I've rebooted everything. I've turned off Windows firewall. It was working fine a few days ago, but now it's not. How do I figure out what's blocking it?

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• How to integrate monit into web app deployment process

  - by shabunc

  I have: Tomcat with webapp deployed via mvn tomcat:redeploy. Monit, pinging the host and restarting server if ping failed. The thing is there in a moment during the redeployment when ping will fail - and this is normal, actually. So, the question is - what is the best way to teach monit to consider the fact of redeployment and not to confuse it with "real" black outs. This is of course an issue of balance between elegance, ease of implementation and scalability. The most straightforward solution I can think of - is just to shutdown monit before deployment and start it up after once again. But this if far from elegance I guess.

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• email archive for multiple users

  - by evanmcd

  Hi, I'm moving a web site from one server to another, and am realizing that I need to move the name servers for the domain as well (they are set to the current host, not to the registrar). So, knowing that email services will stop as soon as I switch the DNS, I'm scrambling to figure out how to archive and make available email data for folks that have mostly been using webmail for the past few years, and may not even have a computer on which to install a client to download the mail to. What does one do in this situation? Thanks for any help offered! Evan

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• How to authorize standard users to install drivers on Windows XP

  - by Dr I

  I'm currently looking for a way to autorize my non administrators users to perform an installation of drivers. Here is the speech: All my users are standard users, they got a VirtualBox Hypervisor if they need the administrator rights. But if they put an USB device on the local machine and try to redirect the device to the Virtual Machine, Windows ask for some Administrator rights. I've try to set up those GPO: Allow standard users to install drivers. Install WHQL Drivers: Allow Silently. I don't know how to do this.

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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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• Best practice for scaling a single application source to multiple nodes

  - by Andrew Waters

  I have an application which needs to scale horizontally to cover web and service nodes (at the moment they're all on one) but interact with the same set of databases and source files (both application code and custom assets). Database is no problem, it's handled already with replication in MongoDB. Also, the configuration of the servers are the same (100% linux). This question is literally about sharing a filesystem between machines so that its content is always correct, regardless of the node accessing it. My two thoughts have so far been NFS and SAN - SAN being prohibitively expensive and NFS seeing some performance issues on the second node with regards to glob()ing in PHP. Does anyone have recommended strategies or other techniques that don't involved sharding data across nodes or any potential gotchas in NFS that may cause slow disk seek times? To give you an idea of the scale, the main node initialises it's application modules in ~ 0.01 seconds. The secondary is taking ~2.2 seconds. They're VM's inside a local virtual network in ESXi and ping time between them is ~0.3ms

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• What do you need to know to get a job as a web developer [closed]

  - by Alex Foster

  What do you need to know to at the very least get your foot in the door? We're assuming for someone who doesn't have a college degree (yet) but will eventually get one. My guess is html, css, javascript, and php, and photoshop and dreamweaver, and sql. And being familiar with using a web host to have sites live, like knowing how to use cpanel. It's probably a very inaccurate and narrow guess but that's what i think right now. I don't know exactly.

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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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• 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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• How do I create a guest ftp user and give access to specific sub-folder with SSH?

  - by gourav

  I just got a virtual dedicated server at GoDaddy. I got the Simple Control Panel. There doesn't seem to be a way to create a guest ftp user through this control panel and I was told it must be created through SSH. I have a program called Putty which can log into the server via SSH. I'm familiar with logging in but does anyone know what the commands are to be used to create a guest ftp user and give them Read and Write access to a particular folder? Regards gourav

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• Puppet: Conditional file source based on naming convention

  - by thinice

  I'm getting the ball rolling on puppet for my environment - and I'd like to have a conditional file resource based on whether or not the module itself contains a file based on a naming convention. So visually, assume a module named 'mysql' and it's layout: mysql/ /files /etc/ my.cnf my.hostname1.cnf my.hostname2.cnf /manifests init.pp ... So I'd like the block to verify if the resource for the module exists or not, and take action accordingly, in pseudo-terms: file { '/etc/my.cnf': if -f 'puppet:///mysql/etc/my.$hostname.cnf' { source => 'puppet:///mysql/etc/my.$hostname.cnf' } else { source => 'puppet:///mysql/etc/my.cnf' } } This way one wouldn't have to manage a csv file or the .pp file with a host specific case statement - is this possible?

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• HAPROXY per domain redirection

  - by SecondThought

  I'm trying to redirect requests to my load balancer by domain name with acl and hdr_dom, to a separate backend. The redirection works ok with the first request - 'GET /' (the destination server is a WordPress site) but when the client asks for the assets ('GET /blablabla/style.css' for example) the haproxy doesn't redirect it to the right backend anymore, but to the default one, with . In the haproxy log I can see the correct host that the request is for (the one that I defined in hdr_dom) but it's like that since the GET request itself is relative (I mean not containing the domain but only from the /blablabla and forth), haproxy doesn't recognize it with the hdr_dom. I'm just guessing here.. Please help...

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• Increasing load capacity for growing website

  - by markxi

  My website currently runs on a dedicated web server (with LiteSpeed) and dedicated MySQL database server. It's a download based site with a lot of user-generated content, which can be streamed and downloaded, there are also thousands of thumbnails and static content. I'm at the stage where the web server can no longer handle the amount of traffic, so I'm looking a how best to increase capacity considering the large amount of downloadable content. My host suggests mirroring everything on a second web server and distributing the load between them using either DNS Made Easy, or to have my own load balancer (using ldirector) in front of the two web servers. Could anyone advise whether the above method would be the best option? Does any one have any experience with DNS Made Easy and/or ldirector? I'd appreciate any help.

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• Vacation scheduler/viewer

  - by Norfeldt

  I'm looking for a solution that allows multiple persons to put plan and notify their vacation by putting it in their electronic calendar and invite a dedicated "robot" email. On the other side I should be able to get a quick overview of the vacation for each person and do a print out that allows me to put it on a board. Example: John puts his winter vacation for week 7 into his calendar and invite [email protected]. Ben does the same thing for week 4 and 5 and invites [email protected]. Dilbert host the [email protected] and prints out and overview for the next 3 months. Each person's vacation is either stated by name or/and color on the print out. I would like to do the thing with standard business software like Outlook 2010 without installing too many softwares. But at the same time it should be easy and quick to make the print outs without too much fiddling Am I dreaming ?

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• How to enable RDP to a Server 2008 R2 on another network? VM network

  - by Saariko

  I have a W2008 R2 installed on a different network (I am on 192.168.0.x - new server on 192.168.3.x) I had trouble ping and RDP to it. I disabled the firewall to test the connection: and that opened the ping feature but I still can not RDP to that machine. the allow remote access is enabled As per sinni80 idea - Here is the error message The networks are divided by a Fortigate 60-B router - 2ndy interface for the gateway is 192.168.3.254 (and pingable from all) any to any rule on both networks is in place. As per Joe Schmoe idea - I am able to RDP to 192.168.3.1 from 192.168.3.3 (which is on the same network) Data to add: - The servers are on a VM host, each of the servers has 2 nics one is DHCP enabled into the 192.168.0.x network 2nd is static IP in the 192.168.3.x -- Further information: The network 192.168.0.x - are on a domain network (active Directory) The network 192.168.3.x - are grouped in a workgroup What should I check more please?

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• Automation Question using VMWare Workstation

  - by James K

  I'm running an experiment that requires me to create 100 instances of Windows XP w/SP3 and saving each VM instance off to a hard drive. I have to annotate the time that the VM load starts (starting my timer when I see the "Setup is preparing...") until the load ends when I see the final desktop after VM loads its drivers. I also have to annotate the host start and stop time. Is there any way this process can be automated? Each load runs me about 16:00 minutes and gets real tiresome after a time. BTW... Exact timing is not necessary, eyeballing as described above is sufficient for my testing needs.

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• Accessing a shared folder using other credentials with Windows 7

  - by Nicolas Buduroi

  I was at a client office trying to connect to a shared drive on their network but was greeted by a "you do not have permission to access" error! Couldn't find any way to enter the required credentials as this message didn't had any other options. Tried to map the drive, selected the option to enter the correct credentials (with \\HOST\user) but it wouldn't work at all. The worst thing in all of this is that my coworker who is using OS X has been able to connect to that drive without any problem, he clicked on it, entered the credentials and could open the folder! The folder is shared by a Windows Small Business Server 2008 machine.

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• XAMPP Closes the Connection and won't let me download anything

  - by Miro Markarian

  I want my XAMPP Apache server to host a zip file (The file is around 250mb) but the server closes the connection and won't let me download the file! However webistes are loading correctly and It seems that the problem is with the extension Does xampp/apache have any file extension limit that they won't let me download .zip and .exe files? Also tested with a smaller .exe file , the problem is still present. It just doesn't let me download any file from the server.!!! Here is the file link to check: Test All I get in the error log is this: Fri Sep 07 23:21:31.742625 2012] [authz_core:debug] [pid 3664:tid 396] mod_authz_core.c(808): [client x.x.x.x:23409] AH01628: authorization result: granted (no directives), referer: http://ammiprox.tk/greeneyes2910/

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• Virtualbox fullscreen mode problem

  - by AtharvaI

  hi all I have a slightly weird issue with virtualbox. My host OS is Win7 (64-bit) and guest OS is Ubuntu 10.10(64-bit). When I switch to fullscreen mode in virtualbox, ubuntu display resizes to fit my screen size. however, after that the display is not updated. So if i click a menu or something I don't see it appear. but it seems to work in the background. if i click a menu in fullscreen mode, i don't see anything happen, but if then switch to windowed mode I see the menu already open. I have installed virtuabox guest additions. if any has a similar issue or has found a solution please let me know thanks.

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• How to turn off power metering in HP ILO2?

  - by Baron Throw

  I have an issue with all of my RHEL 5.3 servers, where HP iLo2 power meter checks the power draw of the power supply on the server. However this gets passed to the /var/log/messages in our host, and eventually fills up the logs. Anyone have any idea how to completely disable power meter option in iLo? I checked google and iLo2 documentation provided from HP, but found nothing that tells you how to disable it / turn it off. Maybe some CLI command? Im not sure. The message is: Aug 18 10:11:03 KAMIL-SERVER1 ipstor_hwmond: IPSTOR||1408371063||E||11788||sensors||Power Meter = 108.000 Watts [ low=na high=na]

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• How can I run 2 already installed OS at the same time?

  - by eran

  I have Win7 and Ubuntu installed on my PC, and I can choose which to run at boot time. I would like to be able to run the Ubuntu from within the Win7. Tools like VMWare allows one to create a new installation of a guest OS, which could then be run alongside the hosting OS. However, I already have the Ubuntu fully installed on my hard drive, and I'd like to maintain the dual boot option. Ideally, I'd like to be able to create a new virtual machine on my Win7, but instead of installing a new guest OS, just direct it to the existing installation. Is that possible?

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• How do I upgrade Django 1.3.1 to 1.4? Any tips, tutorials, or warnings?

  - by hobbes3

  Django 1.4 was recently released. Almost all the information about Django 1.4 is in the release note, but I didn't see anything about how to upgrade. Should I just remove the django folder inside Python's site-packges and download 1.4? I think I originally installed Django using emerge and yum but I'm not sure if the package management systems are up-to-date with Django 1.4 yet. That might be ok on my server instance (Gentoo Linux), but on my local instance I am using virtualenvwrapper (on Mac OS 10.7), so maybe I want to create a new Python virtual environment for Djago 1.4. Or maybe not since I don't really care about backward compatibility with 1.3.1.

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