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• active directory servers synchronization

  - by Mit Naik

  I have 3 AD servers with windows server 2008 R2 at 3 different places, main server is at datacenter and 2 are in our local office which are at 2 different place. I want to synchornize all the 3 server together, were datacenter server should be central server and rest 2 servers should synch with the datacenter server. Please provide us the steps or tutorial to do this. Also we want that once the changes are done in 1 of the AD server the changes are automatically done in all the servers. For example if I change the password of user in our local server it should be updated in our main AD server and other branch server too. Please provide us the steps or tutorial to do this asap. I have one more question I have already created main datacenter AD as domain.local and other domains as xyz.local and abc.local, how can I replicate the additional AD domains with main datacenter DC, also do we require VPN connection, is there any other way to replicate the servers without using VPN connection?

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• Firewall issue with multiple SIP PROXY / REGISTRAR servers

  - by MikeBrom

  Hi We have a pair of Internet-facing SIP PROXY/REGISTRAR servers (for resilienced and load-balancing). When a SIP phone registers, it will be handled by one of the REGISTRAR servers (round-robin DNS) - and since this registration is renewed, the firewall port/address translation is maintained. Therefore, when a call is to be sent back to the phone the INVITE message passes successfully through the firewall. However, it is likely that the phone may register with one of the two servers, but the INVITE may come from the other. In this situation, the call fails since there is no translation in place on the firewall. Is there a feature in the SIP protocol to facilitate this? Any other ideas? As our traffic grows, we will no doubt end-up with more than two servers - so the problem will escalate. Thanks, Mike

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• How to maintain one file across many production servers (Windows and Linux)

  - by Brien

  My organization wants to centrally manage an Oracle TNSnames file for all of their production servers. When that file changes, they want to be able to push out the changes to all servers that use it with a minimal effort. Approaches that have been considered: Centralized file server (drawback: if the file server or the network connection to the file server goes down, the servers have no access to the critical file) Subversion client on each server (drawback: using a source control tool in production, added complexity) Store an individual copy of the file on each server (drawback: changing the file contents involves making changes on many different servers) Update Can I use DFS to do this?

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• Can't get basic web servers working on EC2 RedHat

  - by Yarin

  I'm trying to get some basic Python web servers (Flask, Tornado) turned up on the EC2. On the Amazon-flavored Linux AMI (Amazon Linux AMI 2013.03.1) they work no problem, but the same web servers installed on the RedHat quicklaunch AMI (Red Hat Enterprise Linux 6.4) don't work at all- All I get is connection failure errors when I try to browse to them. Both these servers share the same security group, with the relevant ports (5000, 5010) open, so I'm trying to understand why RedHat would not be not working.

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• MacBook Pro running Vista often drops wireless connection when connected to Windows Home Server...

  - by webjedi

  I've noticed when doing a backup or even just logging onto the WHS console, my MBP will lose it's wireless connection usually about once a session. Any idea why?

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• How to have your DNS servers forward queries for internet names

  - by Xavier Hutchinson

  I have 2 Domain Controllers / DNS servers on Windows 2012, their IPs are 10.0.1.10 and 10.0.1.11 Another server acts as the DHCP server for clients, and sets their primary and secondary DNS to the IP addresses of the previously mentioned domain controllers / DNS servers. However I cannot resolve internet domain names, presumably as they are not hosted on the DNS servers. So my question is what do I have to do on my setup to resolve external domains? Thank you! Xavier.

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• Hot swapping for Linux web/database servers

  - by Art

  Is there a way to perform the following under Linux: There are two web servers, main and backup There are two database servers (postgres), main and backup Web Servers are in sync with each other, ie. configuration/content/applications are the same Backup database is continuously synced up with main database. If either of main servers goes down, it's being replaced with backup one on the fly. When main database server goes back up, all the data from backup server is uploaded to it. Essentially, I need the hot swapping working automatically with no or minimal user intervention, if possible. Recovery procedure is preferably automatic but can include some manual steps.

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• Folding at home: how to check the actual bonus credited?

  - by netvope

  In the past I've completed many SMP Core A2 units, but I haven't been folding since A3 was out. Now I'm running SMP Core A3 on Linux. HFM.NET shows that I should be getting a certain amount of bonus credit, but somebody pointed out that it is only a prediction. How can I check the amount of actual bonus credited to my account for each completed unit?

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• Time Drift on VM servers, need a reliable solution

  - by zeroasterisk

  We have some windows server 2008 VMware instances on multiple physical servers (hosted) and an application which requires the time to be synced across the server instances. Obviously, VMware has problems with this and we really have never gotten it working any better, we have setup the servers to poll for an NTP update every minute which mitigates the problem (in a fairly crude way). Except that every once in a while, the update will fail (because there's already too much drift) and then windows never does an NTP update afterwards which eventually allows the servers to drift far enough apart that our application breaks, and we notice. We are thinking about changing hosts to Xen servers on approximately the same setup, and I anticipate similar problems. can anyone tell me if Xen has the same time-drift issues VMware does, for guests? can anyone tell me what the best windows server settings are for syncing with an external NTP server to keep things in sync: how frequently do you recommend syncing? (assuming every minute) do you recommend running our own NTP server - even if it has to be on a virtual instance? (assuming not) is there any way to tell windows to sync with the NTP server no matter what the time difference is? any other suggestions for keeping windows servers time in sync? I have become familiar with [ http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1318 ] and it's helped, but it's not been totally effective (see above). thanks much!

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• xauth, ssh and missing home directory

  - by flolo

  We have several servers, and normaly everything works fine, except now... we get a new aircondition installed. This takes 36 hours and for this time almost all servers got shutdown, only 2 remaining servers run for the most important tasks (i.e. accepting incoming email, delivering some important websites, login-server). Everybody was informed that when they need appropiate data from the homedirs they should fetch it before take down. Long story short: Someone realized that he have run a certain program on one of the servers. No Problem, he can remote login into our login server and run the programm there without home directory (binaries are local and necessary information can be copied to the /tmp). That works like a charm until... ... the user needs to run a GUI programm. I find no easy way to make it running, usually ssh -Y honk@loginserver is enough but now the homedirectory is missing and ssh is not able to copy the cookies into ~/.Xauthority (as the file server with the home directories is down). Paranoid as all systemadmins all X-Server just listen locally not on tcp ports, so no remote X connection possible SSH config is waterproof - i.e. no way to set environment variables. My Problem is, that the generated proxy MIT cookie from ssh get lost as the .Xauthority doesnt exist. If I could retrieve it somehow I could reenter it a .Xauthority in /tmp. The only other option (besides changing the config) which came to my mind is, makeing a tunnel (netcat, or better ssh) from the remote host to the loginserver and copy the cookie manually (not sure if it the tcp-unix domain socket stuff works as expected). Any good suggestions (for the future - now our servers are already up)?

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• Best way to replicate servers

  - by Matthew

  I currently have two servers both with linux software RAID1 configurations. They use heartbeat and DRBD to create a shared DRBD device that hosts a a exported NFS directory. The servers run Ubuntu Server with a LXDE GUI and some IP These servers are going to be placed on fishing vessels to act has redundant storage for IP cameras. My boss wants me to figure out the most efficient way to create these servers. We might be looking at pushing out several systems a week. Each configuration will be almost identical besides IP addressing. What would be the best method to automate the configuration process? We are trying to cut down on labor costs to set these up. Imaging and Proceeding are both on my mind right now

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• Why don't DNS root servers answer?

  - by JustTrying

  If I try to query a root server with dig, I never receive an answer. For example the output for dig @b.root-servers.net www.ubuntu.com is ; << DiG 9.8.1-P1 << @b.root-servers.net www.ubuntu.com ; (1 server found) ;; global options: +cmd ;; connection timed out; no servers could be reached But if I query other servers (the one of my ISP, or 8.8.8.8), they answer correctly. Why?

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• How to stream TV/Films/Music over the internet to various devices from a home server?

  - by ritch0s

  Set up: An always on old-ish laptop connected to a NAS which contains TV/Films/Music. I want to be able to stream on the fly the data on my NAS to various connected devices such as iphone or laptop. I am currently using Orb (orb.com) mycast software but the requirements for the streaming are very high in terms of processing power is there alternative software and dedicated hardware i can add to get maximum benefit from this setup?

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• Putting servers inside a refrigerator? [closed]

  - by Muhammad Jamal Shaikh

  It could be a silly question, but I decided to go for it. I shall be buying 3 servers in the next few weeks to set up a small webfarm at my home. I am told by different people who work in server rooms, that I should keep my servers in an air conditioned room. Which is really expensive, because the temperature here in south asia is between 10 to 50 degrees C. Here comes the funny part: I have an extra fridge in my home, why shouldn't I put the servers inside that fridge? Benefits: I don't have to buy the air conditioner. I don't have to buy the rack mount for the servers. The electricity consumed by the fridge is much much less than AC. Give me your suggestions!

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• How DNS server resolves when web servers are geographically distributed

  - by Supratik

  Hi A domain abc.com has two web servers located in two different location one in India and another in Malaysia. If the request are handled by the servers depending on the location from where the request originates then how DNS server resolves for such geographically distributed servers when my client system is configured to a local DNS server in Indian or a DNS server in Malyasia ? Warm Regards Supratik

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• putting servers inside a fridge! [closed]

  - by Muhammad Jamal Shaikh

  hi , i think its a silly question , but i decided to go for it. i shall be buying 3 servers in next few weeks for setup a small webfarm at my home. i am told by different people who work in server rooms , that i should keep my servers in a Air Conditioned room. which is really expensive.because temperature in south asia is b/w 10--50(Centigrade). here comes the funny part, i have an extra fridge in my home , why shouldn't i put the servers inside that fridge. here are benefits listed i dont have 2 buy the air Conditioner i dont have to buy the rack mount for the servers the electricity consumed by the fridge in much much lessor as compared to an AC be free to give your suggestions :) thanks Jamal.

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• Mesh Networked servers via vpn

  - by microspino

  I got a design idea and I would like to have some advice from SF about It. I have 5 customers with small real-estate databases. I've built for them a desktop app and now they would like to merge their database to share their data. I don't want to centralize everything in one place nor I want to do maintenance for servers. They told me also, that all of them in their offices, have little servers and maintenance guys available. Although everything seems suitable for web application, I had the idea to experiment something new: Any customer small-server wild be connected to the others in a sort of mesh network without a single point of failure and through VPNs. If one of the servers went down the customers could still connect to their databases from one of the other mesh networked servers instead of from the local one that is down. During normal operations all the servers sync the db with the others through VPNs. I can accept a half-day timing window of NON synched data, in other words, since I don't need real time synchronization, the server don't have to always stay in synch. I can migrate my data over to other Non-Sql technologies like CouchDB or Redis or whatever you suggest. As you can see I don't have a lot of constraints and although I could go with a web application I would like to delegate and decentralize support, data-privacy and management, as more as I can to my customers offices. Is that a crazy idea? Do you know If something similar exist? Which technology would you suggest?

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• Connecting two servers together - How to?

  - by Chris

  Is it possible to connect two servers running for example Windows Server 2003/2008 together. For example they are seen on the network as one server with the combination of all HDD from each server? Example: \\Server1 - 1 x 1tb hdd \\Server2 - 1 x 1tb hdd I would like users of the network to be able to store their documents on both servers for load balancing. So basically a RAID between the two servers? Any help would be appreciated.

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• How do you backup 40+ Centos5.5 servers?

  - by John Little

  We are embarrassed to ask this question. Apologies for our lack of UNIX expertise. We have inherited 40+ centos 5.5 servers, and don't know how to back them up. We need low level clone type images so that we could restore the servers from scratch if we had to replace the HDs etc. We have used the "dd" command, but we assume this only works if you want to back up one local disk to another, not 40 servers to one server with an external USB HD attached. All 40 servers have a pair of mirrored disks (dont know if its HW or SW raid). Most only have 100MB used. SErvers are running apache, zend, tomcat, mysql etc. Ideally we dont want to have to shut them down to backup (but could). We assume that standard unix commands like tar, cpio, rsync, scp etc. are of no use as they only copy files, not partitions, all attributes, groups etc. i.e. do not produce a result which can simply be re-imaged to a new HD to get the serer back from dead. We have a large SAN, a spare windows box and spare unix boxes, but these are only visible to one layer in the network. We have an unused Dell DL2000 monster tape unit, but no sw or documentation for it. WE have a copy of symantec backup exec, but we have no budget for unix client licenses. (The company has negative amounts of money). We need to be able to initiate the backup remotely, as we can only access the servers in person in an emergency (i.e. to restore) Googling returns some applications to do this, e.g. clonezilla - looks difficult to install and invasive. Mondo, only seems to support backup if you are local to the machine. Amanda might be an option, but looks like days/weeks of work to learn and setup? Is there anything built into Centos, or do we have to go the route of installing, learning and configuring a set of backup softwares? Any ideas? This must be a pretty standard problem which goggling doesnt give an obvious answer.

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• How do I create a Dynamic SCOM group that includes HP servers with a certain name

  - by makerofthings7

  I'd like to select servers that are HP servers and start with NYCEX*. I looked at the following HP group and the query appears like this: <Expression> <Contains> <MonitoringClass>$MPElement[Name="HewlettPackard.Servers.HPServer"]$</MonitoringClass> </Contains> </Expression> How do I recreate that query and include a filter for a naming pattern, or AD OU?

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• Configure nagios to alert only when there are no mx servers available

  - by Aseques

  In my company there are two redundant MX servers, I would like to tell nagios to wake me in the night ONLY if both servers are down. The default behavior is to alert whenever one of the MX servers is down. I would like to set a timeperiod i.e. 23:00 to 06:00 when nagios only alerts me by sms in case both servers are down. I am using nagios3 but I couldn't find something like this in the docs. Solution: I've used this check_command in a service called MXservice: check_command check_service_cluster!"MXservice"!2!1!$SERVICESTATEID:mx1:SMTP$,$SERVICESTATEID:mx1:SMTP$ Thanks for all your help

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• How do I set up a proxy server for home with bandwidth control, download limit options?

  - by Quakeboy

  3 room mates share a single 2 Mbps connection. Have a 40GB per month download limit beyond which speed drops to 256Kbps which is annoying. One of the roommates abuses the connection by downloading beyond his quota limit. I have a Netgear WNR1000v2 Wireless router + ADSL Modem to connect to the internet. We all access internet via Wireless router which connects to ADSL Modem. I need a free proxy solution which can help me set 40GB / 3 (13 GB) limit for each person (every person has 2 devices - a PC and a phone with Wifi) Uniform Bandwidth control - when 2 people browse the internet they should get 1 Mbps each, and when 3 people access, they should get 2Mbps divided by 3. After each person crosses their monthly download limit, they should be able to access the internet with 256Kbps speed only or lesser. Can I have a custom firmware on my wireless router do this (or) Do I need a proxy server ? Please point me to any relevant tutorials (for example with Squid).

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• Availability of big files on multiple servers

  - by Imises

  I have to handle many (1'000 - 30'000) big files ranging from 200MB up to 2GB. The demand for these files is variable (0 - 300 downloads / file). This is why a single file must saved on 2 or more servers. My servers are placed in different datacenters (France), with different size HDDs (750GB to 4TB). Currently I share the files using PHP and ncftpget / ncftpput, but it's very slow. I need a solution to handle balancing these files across 7+ servers.

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• 2 servers, high availability and faster response

  - by user17886

  I recently bought a second webserver because I worry about hardware failure of my old server. Now that I have that second server I wish to do a little more then just have one server standby and replicate all day. As long as it's there I might as well get some advantage our of it ! I have a website powered by ubuntu 12.04, nginx, php-fpm, apc, mysql (5.5) and couchdb. Im currently testing configurations where i can achieve failover AND make good use of the extra harware for faster responses / distributed load. The setup I am testing nowinvolves heartbeat for ip failover and two identical servers. Of the two servers only one has a public ip adress. If one server crashes the other server takes over the public ip adress. On an incoming request nginx forwards the request tot php-fpm to either server a of server b (50/50 if both servers are alive). Once the request has been send to php-fpm both servers look at localhost for the mysql server. I use master-master mysql replication for this. The file system is synced with lsyncd. This works pretty well but Im reading it's discouraged by the (mysql) community. Another option I could think of is to use one server as a mysql master and one server as a web/php server. The servers would still sync their filesystem, would still run the same duplicate software (nginx,mysql) but master slave mysql replication could be used. As long as bother servers are alive I could just prefer nginx to listen to ip a and mysql to ip b. If one server is down, the other server could take over the task of the other server, simply by ip switching. But im completely new at this so I would greatly value your expert advice. Is either of the two setups any good ? If you have any thoughts on this please let me know ! PS, virtualisation, hosting on different locations or active/passive setups are not solutions im looking for. I find virtual server either too slow or too expensive. I already have a passive failover on another location. But in case of a crash I found the site was still unreachable for too long due to dns caching.

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• Mirrored servers in data centers nationwide -- how? [closed]

  - by Sysadmin Evstar

  Possible Duplicate: Mirrored servers in data centers nationwide — how? Mirrored servers in data centers nationwide -- how? I flunked my IT interview by getting this question wrong. I thought that in the various metropolitan areas, an "http://google.com" request goes to the ISP's DNS server, which somehow returns an IP address for one of several geographically-nearby http servers, and then something internally rolls over to the next available local Google server. But then, I could not explain where the table of available local Google servers is actually cached, or the details of the IP address rollover. Or how they could manually take some server out of the rotation, from anywhere. So, what should I be reading now so I can ace this question next time? Also, what daemons run on these machines 24/7 to keep all those mirrored database disks synchronized?

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