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• how to find a good data center?

  - by drewda

  At my start-up, we're getting to the point where we should be hosting our servers at a data center. I'd appreciate any tips and tricks y'all can offer on finding a reputable place to colocate our racks. Are there any Web sites with customer reviews of data centers or should I just be asking around at techie events? Are unlimited bandwidth plans a gimmick or becoming the norm? Is it worth establishing a redundant set of machines at a second data center from Day One? Or just do offsite back-ups? Thanks for your suggestions.

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• P4 vs. i3/i5 *T in power consumption and performance [migrated]

  - by Walter Zomb

  I am running an Intel P4 prescott with HT on my home server (linux file server on encrypted disks on software-RAID5 and virtualisation host for three further machines). The performance for this purpose is really okay. When the system is idle it consumes about 140W power. I am considering buying a new mainboard for an e.g. Intel i3-2100T or an Intel i5-2390T. Both are low power CPUs with a TDP about 40W. Has anyone experiences how much power a recent mainboard with one of these CPUs an 3-4 'green-energy' disks (6W each) consumes? Do I get underneath the 100W threshold? What's about the performance of these low power CPUs? Are they comparable to an Intel P4 with HT? regards, walter

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• SNMPD timeout yet netcat shows port as open

  - by Kirill Gordeenko

  SNMPD config (I have this config working on a different server): com2sec readonly default public group MyROGroup v1 readonly group MyROGroup v2c readonly group MyROGroup usm readonly view all included .1 80 access MyROGroup "" any noauth exact all none none syslocation <LOCATION> syscontact <CONTACT> When I check the port from remote machine: » nc -zvu xx.xx.xx.xx 161 Connection to xx.xx.xx.xx 161 port [udp/snmp] succeeded! This also works locally (I get all the right stats): snmpwalk -v 2c -c public localhost Yet when I try same command locally or remotely with external IP: Timeout: No Response from xx.xx.xx.xx IPTables are disabled on both machines. /etc/sysconfig/snmpd looks like this: OPTIONS="-Lsd -Lf /dev/null -p /var/run/snmpd.pid" -a /etc/default/snmpd is empty.

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• associate dhcp requests with subdomains in dnsmasq

  - by Dezra

  I have dnsmasq running as a dns server with a number of linux boxes using static ips that run several virtual hosts on subdomains. I currently have the following address line in my dnsmasq.conf to map the subdomain of a boxes address to the boxes static ip: address=/.devbox1.mydomain.com/192.168.1.3 address=/.devbox2.mydomain.com/192.168.1.4 e.g. site1.devbox1.mydomain.com > maps to devbox1 static ip, site1 virtual host site2.devbox1.mydomain.com > maps to devbox1 static ip, site2 virtual host site3.devbox2.mydomain.com > maps to devbox2 static ip, site3 virtual host I was wondering if I can change the machines over to DHCP addresses (instead of static) and have dnsmasq use the dhcp ip instead of the static one? Can I modify the address line to refer to the DHCP address (obviously, I cant hardcode the address)? I know I could add mac address to ip allocation, but I want to avoid this if possible.

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• Amazon EC2, fastest way to get a node into an existing cluster

  - by imaginative

  I'm new to Amazon AWS. A lot of the time I hear about people folks spawning instances and almost instantly putting them behind a load balancer and into an existing cluster. In the traditional world of managed machines, this would include provisioning hardware, installing an OS, configuring the network on the machine and once the network is available, use a tool of your choice such as CFengine, Puppet or Chef to bootstrap the machine based on its class. It seems like there are "shortcuts" that are able to get a server of a particular class up and running in Amazon EC2. If I have a particular stack running on my server, such as erlang, tomcat6 etc.. what's the fastest way to get these up and running and hooked into Amazon's load balancer? From network, to software stack to kernel tuning? Is it a combination of creating an AMI then running a tool like Puppet against the new instance? Any idea

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• NIC: Changing Link Speed & Duplex to Full Duplex Is Drastically Slower

  - by rism

  I have an old Win Xp box with a 100 PRO/100 VE NIC and connecting to a Win 7 box with gigabit NIC via an ASUS gigabit router and peer to peer. I was getting 76% network utilisation on the XP machine using AUTO as the value for Link Speed and Duplex which is fine. But I decided to see what would happen if i selected Full Duplex 100Mbps on the XP box. I thought at worst it would be as good as auto detect since the Win 7 box it's transferring to is faster. Instead network utilisation dropped to 0.12% (as in a 10th of a percent) and the transfers just timed out. No biggie to reverse back to Auto but my question is why is full duplex such a dog? Im not "stuck" but just dont understand. There are only 2 machines here connecting through a router so i cant see how that would cause alot of collisions etc (if thats the problem).

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• Easy way to restrict permissions in an elementary school computer lab?

  - by Andrew

  I'm putting together an elementary school computer lab. I have nine winxp pro machines that are not networked and do not have internet access (no money to do either). I've created separate student and admin accounts, and have the students set as limited users. However, I'm interested in further restricting their permissions. I want to make it such that they cannot: -delete any files, even just from their own profile -rename any files -move around the icons on the desktop -change any display settings -access a usb device without a password (they bring in their own from home which are chock-full of viruses) Oh, one last thing, they still have to be able to save word documents. Is this even possible? I can download software, but, like I said: no internet, no server.

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• Bridge and OpenVPN with shorewall

  - by Javier Martinez

  I have this scenario and everything it's working OK, but I want to configure my Shorewall and I can't do it. My interfaces are: br0 (bridge of eth0) tun0 (OpenVPN) vnet* (each one of bridged interfaces with public IP's) Public Main IP: 188.165.X.Y OpenVPN IP's: 172.28.0.x Bridge: public ip's So, I have the next configuration for shorewall: /etc/shorewall/zones #ZONE TYPE OPTIONS IN OUT # OPTIONS OPTIONS fw firewall inet ipv4 road ipv4 /etc/shorewall/interfaces #ZONE INTERFACE BROADCAST OPTIONS inet br0 detect routeback road tun+ detect routeback /etc/shorewall/policy #SOURCE DEST POLICY LOG LIMIT: CONNLIMIT: # LEVEL BURST MASK $FW all ACCEPT inet $FW DROP info road all DROP inet road DROP /etc/shorewall/tunnels #TYPE ZONE GATEWAY GATEWAY # ZONE openvpnserver:1194 inet 0.0.0.0/0 The problem is that even with shorewall running I am able to ping or connect to the virtual machines behind the bridge

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• I can't do a Remote Assistance session to a Windows XP box from Windows 7.

  - by superkinhluan

  My Mom's computer is running Windows XP, and my desktop running Windows 7. She's having some technical issue, so I want to do a Remote Assistance session to her machine. However, no matter what I've tried, the Remote Assistance program doesn't connect successfully. I've verified that the Windows Firewall (on both my and her machines) is configured properly to allow Remote Assistance program to go through. What's interesting is that I have the same problem when I try to do Remote Assistance from my desktop to my laptop, which is also running Windows XP. However, when I try to connect to my girlfriend's machine, which is runninng Windows 7 this time, the connection is successful. So in the end, I guess there must be some incompability between Windows 7 and Windows XP. Does anyone experience the same issue? How did you resolve it?

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• Mac internet problems

  - by Bradley Herman

  Our office is set up with mostly macs (7 of them) but we do have a windows laptop and a windows desktop on the network as well. The network is configured with a modem going into a switch/router throughout the office to the computers, along with a wireless router. Everything runs fine most of the time, but periodically while using the web, certain sites will stop loading and timeout repeatedly. This usually lasts 20 minutes or so and can be incredibly annoying. Resetting the modem/router and/or rebooting the computer never helps. The weirdest part is that in almost every case, the websites are fine on our Windows machines. I frequently use github, google, Stack Overflow, and jQuery reference and I can count on the sites being unavailable to me at least once a day. While I can't get them to load, I can spin my chair around to the windows server behind me and load the sites just fine. Any idea what the hell could be going on here?

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• How to deploy SQL Server 2005 Reporting Services on a network without a domain server?

  - by ti

  I have a small Windows network (~30 machines) and I need to deploy SQL Server 2005 Reporting Services. Because I use SQL Server Standard Edition and not Enterprise, I am forced to use Windows Authentication to the users. I am a Linux admin, and have near zero knowledge on Active Directory. As deep as my shallow knowledge goes, I think that I would need to invest in a domain server, a mirrored backup of that domain server. I think that I need to change every computer to use this domain too, and if the domain server goes down, every computer will be unavailable. Is there a easier way to deploy Windows Authentication so that users can access Reporting Services from their computers without changing the infra-structure that much? Thanks!

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• MacOS X 10.6 Portable Home Directory sync fails due to FileSync agent crashing

  - by tegbains

  On one of our cleanly installed MacPro machines running MacOS X 10.6.6 connected to our MacOS X 10.6.6 Server, syncing data using Portable Home Directories fails. It seems to be due to the filesync agent crashing during the home sync. We get -41 and -8026 errors, which we are suspecting are indicating that there is too much data or filesync agent can't read the files. The user is the owner of the files and can read/write to all of the files. < Logout 0:: [11/02/04 13:10:42.751] Error -41 copying /Volumes/RCAUsers/earlpeng/Library/Mail/Mailboxes/email from old imac./Attachments/12081/2.2. (source = NO) < Logout 0:: [11/02/04 13:10:42.758] Error -8062 copying /Volumes/RCAUsers/earlpeng/Library/Mail/Mailboxes/email from old imac./Attachments/12081/2.2/[email protected]. (source = NO) < Logout 1:: [11/02/04 13:10:42.758] -[DeepCopyContext deepCopyError:sourceError:sourceRef:]: error = -8062, wasSource = NO: return shouldContinue = NO

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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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• Browsing Pictures on a Mac

  - by Mr Woody

  Hi. After many years using linux, I decided to buy a mac. Now my main problem is: how do I synchronize pictures within my linux machines and the mac? I have been using digikam in linux, and I like it because I can just browse the pictures directly from my directories (and it is easy for me to keep directories synchronized within mac and linux). I have been testing iphoto and aperture, which are quite nice but if use them, my understanding is that I have to import all the pictures into these softwares, and this doesn't seem to be the ideal solution for me. I tried picasa, but I don't find it as good as iphoto and aperture. On the other hand it allows me to browse directories, without having two copies of the same pictures. I didn't try lightroom yet, would that be a good solution? I would appreciate any suggestion on this. Thanks!

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• Memeory Leak in Windows Page file when calling a shell command

  - by Arno

  I have an issue on our Windows 2003 x64 Build Server when invoking shell commands from a script. Each call causes a "memory leak" in the page file so it grows quite rapidly until it reaches the maximum and the machine stops working. I can reproduce the problem very nicely by running a perl script like for ($count=1; $count<5000; $count++) { system "echo huhu"; } It is independent of he scripting language as the same happens with lua: for i=1,5000 do os.execute("echo huhu") end I found somebody describing the same issue with php at http://www.issociate.de/board/post/454835/Memory_leak_occurs_when_exec%28%29_function_is_used_on_Windows_platform.html His solution: Firewall/Virus Scanner does not apply, neither are running on the machine. We can also reproduce the issue on other Developer Machines running XP 64, but not on XP 32 Bit. The guilty guy for the allocation is C:\WINDOWS\System32\svchost.exe -k netsvcs which runs all the basic Windows services. Does anybody know the issue and how to resolve it ?

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• Best filesystem choices for NFS storing VMware disk images

  - by mlambie

  Currently we use an iSCSI SAN as storage for several VMware ESXi servers. I am investigating the use of an NFS target on a Linux server for additional virtual machines. I am also open to the idea of using an alternative operating system (like OpenSolaris) if it will provide significant advantages. What Linux-based filesystem favours very large contiguous files (like VMware's disk images)? Alternatively, how have people found ZFS on OpenSolaris for this kind of workload? (This question was originally asked on SuperUser; feel free to migrate answers here if you know how).

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• Why is ntpd not updating the time on my server?

  - by John

  I have ntpd running on my server. It's all the default settings, except I commented out its ability to be a server to other machines: # restrict -4 default kod notrap nomodify nopeer noquery # restrict -6 default kod notrap nomodify nopeer noquery restrict default ignore If I run ntpdate -q ntp.ubuntu.com, I'm told that my machine's clock is off by 7 seconds. What's going on? How can I diagnose what's happening, is there a log I can turn on? more info #1 # ntpq -np remote refid st t when poll reach delay offset jitter ============================================================================== 91.189.94.4 193.79.237.14 2 u 30 64 7 108.518 -0.136 0.361 more info #2 Here's what this looked like when I asked the question: # ntpdate -q ntp.ubuntu.com server 91.189.94.4, stratum 2, offset 7.191308, delay 0.13310 10 Jan 20:38:09 ntpdate[31055]: step time server 91.189.94.4 offset 7.191308 sec And here's what it looks like now, after restarting ntpd a couple times (I'm assuming that's what fixed it): # ntpdate -q ntp.ubuntu.com server 91.189.94.4, stratum 2, offset 0.000112, delay 0.13164 10 Jan 20:47:03 ntpdate[31419]: adjust time server 91.189.94.4 offset 0.000112 sec

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• Finding Image resolution in PDF file?

  - by Dave

  I have a problem of having some users creating very large PDFs. On the other hands I have PDF sent from our fax machines that are really small in size and totally printable. My question is Is there any way I can find the resolution (DPI) of the PDF. I search the internet, could not find any answer. Checked the properties of the file, this information was not stored there, at least in my case. What is the optimum resolution of converting text file into image PDF. 96dpi, 300dpi or more ? Fun question. Can I resize a PDF which was scanned with high dpi into smaller dpi? I know some answers might not be available as I have already searched the internet and could not find answers. Note: My PDF are entirely images, text to images. I am also familiar with primoPDF (free) something you can experiment with

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• X11 display over ssh with monitor connected to remote machine

  - by Sumit

  I have the following setup: Machine A (a.corp, 192.168.100.130, local machine) and Machine B (b.corp, remote machine) and a monitor is connected to each of these machines. When I ssh from a.corp to b.corp as $ ssh -X b.corp $ xclock Error: Can't open display: I tried setting the DISPLAY variable as $ ssh -X b.corp $ export DISPLAY=`echo $SSH_CLIENT|cut -f1 -d\ `:0.0 $ echo $DISPLAY 192.168.100.130:0.0 $ xclock xclock's display opens up but on the monitor connected to b.corp (remote machine) and not on the monitor connected to a.corp (local machine). Is there a way to force the display to appear on the monitor of the local machine (a.corp)?

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• OpenVSwitch and Virtualbox configuration

  - by Newbie

  I am trying to setup a lab network with OpenVSwitch (Virtual L3 Switch). I want to connect my 3 Virtualbox guest machines (running Debian 6) using OpenVSwitch. But, confused as what should I do first and how should I do this. I mean should I install OpenVSwitch on my VM or on my host machine? If I install on my host machine, then should I make to connect to my VMs. OR If I install OpenVSwitch on one of my VM, then how to connect the rest of the VMs to virtual switch. I know, there is option to connect internal networks in virtualbox, but I a want L3 switch to interconnect my VLANs. Can someone guide me here. Please & Thank you.

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• Which GPO is making my Domain Controller my clients' DNS server?

  - by Harry Muscle

  I maintain a small domain (about 20 clients) and we need to make some changes to the DNS server that's being used by the clients. All the clients have been hard coded to use the domain controller as their DNS. Since these are new machines, and I never changed their DNS settings, I'm guessing there must be a GPO that's causing them to use the domain controller as their DNS. Since we don't have any GPO other than the default one yet, it's got to be the default GPO, however, I have looked through all the GPO settings and none of them refer to anything related to DNS. So I'm wondering if there's anything else that might be causing this. Any help or advice is highly appreciated. Thanks, Harry

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• Public Facing Recursive DNS Servers - iptables rules

  - by David Schwartz

  We run public-facing recursive DNS servers on Linux machines. We've been used for DNS amplification attacks. Are there any recommended iptables rules that would help mitigate these attacks? The obvious solution is just to limit outbound DNS packets to a certain traffic level. But I was hoping to find something a little bit more clever so that an attack just blocks off traffic to the victim IP address. I've searched for advice and suggestions, but they all seem to be "don't run public-facing recursive name servers". Unfortunately, we are backed into a situation where things that are not easy to change will break if we don't do so, and this is due to decisions made more than a decade ago before these attacks were an issue.

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• periodically overridding NTP for simulation purposes

  - by Gerard

  I have this situation: NTP is used to sync time on a set of Windows 7 and Server 2008 machines. Nothing out of the ordinary about this. periodically on this system, the time needs to be changed for testing/training purposes (it is a training simulation system that has a lot of time-dependent operations). My question: As NTP in general does not really like big time jumps or changes AFAIK, is there a standard way this could be set up to allow the clock to be changed at the root NTP server in the system and have it propagate through the system in a reasonable amount of time (a minute or two?) It is not acceptable to disable and/or restart all NTP client services to achieve this. Any ideas? It would be nice to do this without writing some kind of custom script to disable services and update clocks all over the place. Thanks in advance.

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• windows 7 goes crazy after multiple rdp sessions

  - by rphilli5

  On several different windows 7 machines after using multiple rdp sessions, the local computer begins to act like a function key is locked on. Windows will start opening and closing windows as I type and only a few of the characters will show up normally. The solution to get rid of this issue is to depress the windows key and than num lock, to return to normal keyboard operation. A reboot will also fix the issue. Does anyone know what causes this and how to prevent it from occurring in the first place?

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• NIC bonding with two uplinks

  - by Karolis T.

  Is bonding the preferred way of implementing ISP redundancy? In the texts I've seen, bond device has a netmask, gateway of it's own. How can this be obtained if there are two different gateways from two uplinks, which one to choose? Do I need any special routing rules to go with it or does simply configuring separate interfaces (using Debian, /etc/network/interfaces), i.e eth1, eth2 for their corresponding uplinks and bonding them to bond0 handle routing automatically? If I want to NAT client machines, do they use bond device's IP as a gateway? Does the bond0 device is the device that goes into iptables nat rules? Thanks

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