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• DFS-R + VSS - Run VSS at all locations or one?

  - by pbarranis

  I have 4 servers, one at each office location, each sharing read/write copies of 1.5TB of data. Changes are replicated 24/7 between all 4 servers via DFS-R. All servers run Windows 2008 R2. I'm interested in implementing VSS (Volume Shadow Services) on this data. I've read that DFS-R and VSS play nicely together, but I'm left with one unanswered question: turn on VSS at all locations or just one (the headquarters). Can I run VSS at all 4 locations safely, or is it wiser to run it at just 1 location? Thanks!

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• shared web hosting architecture in a university setting

  - by gaspol

  We're in the process of creating a shared webhosting infrastructure for our university. Departments within the university can host their sites on this infrastructure. We're thinking of setting up multiple, load balanced web servers attached to shared storage (for web content and Apache config files). There will also be database servers behind these web servers. Does anyone have any other suggestions about this? Any recommendations for an alternative setup? Would having cPanel/WHM/Plesk be a good idea to automate account creation/maintenance?

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• Hyper-V Server hvremote.wsf Script - ns lookup for DNS Verification test fails

  - by Vazgen

  I'm trying to connect my Hyper-V Server to a Windows 8 client for remote management. I have: Joined server to WORKGROUP Enabled Remote Management Set the server name Set a static IP Set the DNS servers to my ISPs DNS Servers (same as default DNS Servers on my Windows 8 remote management client) Set the correct time zone Created net user on server (net user /add admin password) Added user to special Administrators group on server (hvremote /add:admin) Granted anonymous dcom access on client using hvremote However, the "ns lookup for DNS verification" fails on both the client and server with the same error: Server: my.isps.server.name.net Address: 111.222.333.1 *** my.isps.server.name.net can't find 192.168.1.3: Non-existent domain Thanks for the help.

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• SSL issue with emails

  - by JackWillDavis

  OK, so I have somebody hosting a site on my CentOS 5.8 Plesk 11 control panel. He has a EV SSL which is validating the site fine however he has failed the PCI check because it is saying his email servers (SMTP, IPAM, POP) have the wrong name on the servers. This is because his SSL certificate is not a wildcard certificate and the email servers are flagging the default Plesk SSL certificate. Is there a way to stop Plesk automatically connecting emails via the default SSL? I'm fairly new to things like this so I hope I've written everything I need, let me know if any more details are needed. Jack

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• Use dns suffixes only on certain wireless networks?

  - by eidylon

  Hello all, quick question. I'm a software guy and networking is all black magic to me! I have a laptop which I use at home and at the office. In order to be able to more easily reference our servers at work, I have our domain name in the DNS suffixes on my TCP/IP settings on my wireless connection. This all works beautifully and I can reference our servers simply by name only. Now the problem... When I go home, it still has those suffixes in there, and I cannot access other servers because it appends the DNS suffixes to the server names. Is there a way I can set up DNS suffixes so that they are only applied when connected to a certain wireless network (I'm thinking by SSID).

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• Is there a server distro with the capability of syncing live data to multiple machines?

  - by Adam Hart

  Scenario: I have a main server that is used for pagebuilding/storing master data, and is accessed by a few clients on site. This company also has multiple branches with their own server that that connect to locally, but need to work with all the same data, and have it synchronized across all servers in real (or close) time. Is there a way/specific server OS that can sync live data across all of these servers? These servers would also need to be able to: Configure AFP, FTP, CIFS, SMB Continue to host their web server and database server in a Microsoft environment, but move the file server off to commodity hardware Just wondering if this is even possible.

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• How do you manage large web farms?

  - by Andrew Katz

  I have a quickly growing web farm running IIS 7 (30+ servers). All servers are identical copies of each other and all servers are physical. We update the software about once a month, and in the current process, we follow the following steps: Disable server from pool on F5 load balancer. Disable HTTP Keep-alives in IIS so connections drop quickly. Change default directory of website to new folder containing new binaries. Test server Enable HTTP Keep-alives. Enable server in F5 pool. Move to server 2 Microsoft used to have Application Center which was abandoned a while ago. They have made a second attempt with the Web Farm Framework, but this adds as much QA time testing the release package as it saves in the deployment. Has anyone seen a commercial off the shelf application that is tailored for managing and deploying to large web farms? Thanks!

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• Network monitoring solution

  - by Hellfrost

  Hello Serverfault ! I have a big distributed system I need to monitor. Background: My system is comprised of two servers, concentrating and controlling the system. Each server is connected to a set of devices (some custom kind of RF controllers, doesnt matter to my question), each device connects to a network switch, and eventually all devices talk to the servers, the protocol between the servers and the devices is UDP, usually the packets are very small, but there are really a LOT of packets. the network is also somewhat complex, and is deployed on a large area physically. i'll have 150-300 of these devices, each generating up to 100+ packets per second, and several network switches, perhaps on 2 different subnets. Question I'm looking for some solution that will allow me to monitor all this mess, how many packets are sent, where, how do they move through the network, bandwidth utilization, throughput, stuff like that. what would you recommend to achieve this? BTW Playing nice with windows is a requirement.

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• What configuration management solutions exist in a non-networked environment?

  - by Rob Spieldenner

  My servers exist in an environment without outside network connectivity (this is a requirement), so when I deploy updates all packages, binaries, config files, etc. must be included on the delivered media. And of course I want some sort of configuration management so I can tell what has and hasn't been installed. So I was wondering if people had experience with chef, puppet, or another configuration management type tool for dealing with this type of environment. Worst case I deploy my updates as an RPM. EDIT: My setup has both Linux servers and Windows servers.

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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 apply development practices like version control, testing and continuous integration/deployment to system administration?

  - by arex1337

  Imagine you're going to manage a number of servers with a number of different services that's used by a number of people. Now say you want to reconfigure or replace some software on one of those servers. Obviously you don't want to work on servers that are in production. If this was a code change, as a developer, I would make the change on my local development machine, test it locally and commit the change to a version control system. The changes could then be deployed in a staging environment, tested further and finally deployed in a production environment. It would also be easy for me to roll back, if necessary. Generally, or specifically, how do you achieve this in system administration? (The first thing that comes to mind is to use virtual machines and put virtual machine images in version control, but I'm sure there is a lot of literature and clever solutions I'm not presently aware of.)

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• Firewall configuration [closed]

  - by yogsma

  So I have a router as facing to the outside world. I have 3 application servers and a database server. All these servers are behind router. Now we are trying to configure the firewall between outside world and router. All servers use Redhat linux. What all precautions , steps I have to carry so that firewall configuration won't create any issue when we restart our application? It would be nice if experienced users help in this case.

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• How to scale out OpenStreetMap data efficiently

  - by Pierre

  For over a year now, I'm running an in-house PostGIS server filled with OSM data, used for both Mapnik-based tile generation and Nominatim-based geocoding, updated with day replicates. This works pretty well. However, as usage is growing exponentially, I would like to achieve better reliability and performance by adding additional PostgreSQL servers. And I'm kind of lost. Since PostgreSQL doesn't seem to handle replication by itself, I would think about using a piede of middleware like PgPool-II to keep the servers in sync. But I'm afraid it would be nothing but necessary for this usage : very high read-to-write ratio, where all writes are done at the same exact time every day. My questions are simple : What would you do to keep these servers in sync? And, what is done for this at the OpenStreetMap Foundation, MapQuest, Mapbox or CloudMade? Thanks.

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• Code deploy system [closed]

  - by Turnaev Evgeny

  Currently we deploy code to servers in a various ways: freebsd package freebsd ports part of config files and static just svn up'ed and a symlink is changed to new upped folder The distribution of freebsd packages to target servers is done through custom tool that uses ssh. I am looking for a code deploy system that will allow: deploy several packages (freebsd or linux) atomic (ether deploy all or none of them to server) can save a history of last stable version - so in case of bad deploy i can easily rollback to last working version all servers ease deployment of config and static files - and integrate those into atomic deploy/rollback system. should work with freebsd or linux (apt-get system)

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• How to allow an internal server accept remote connections not through RD Gateway

  - by Matt Ahrens

  So, I help administrate a collection of servers running various windows server environments. We have a RD Gateway server, properly configured, to gatekeep for us. It does not have the other servers listed in it's server farm category, though. I just added a refurbished server for a non-profit development environment that is sharing the rack space and port. I would like this server to be accessible via remote connection, but not require RD gateway certification (I cannot add the users for this development server to our gateway since they do not work for the organization hosting the rack.) Is there any way for me to add this dev. server as an exception to which servers should require RD Gateway clearance, or otherwise let users bypass RD gateway credentials for this one machine? Thanks, and let me know if I am misinformed on how RD gateway works or anything. I am still learning.

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• Recommendations for VMWare web server environment with load balancer.

  - by Ben

  We run IIS websites on a VMWare production server that pull image content and video content from a separate IIS instance on another server (media server). The media calls (images and video) are straight http:// calls and not using a streaming application. During peak traffic periods, we clone the production server five times and have a load balancer distribute traffic to all five production servers. The media server does not get ramped up. We noticed that the processing and resources on the media server gets very taxed during this period. Would it make sense to run the IIS instance for the media server locally on the production server and have it cloned with the production servers, then have a rule on the load balancer negotiating these media calls from the website? Would it be better to allocate more resources (memory and CPUs) to the media server VM and not clone it with the production servers? Recommendations are sincerely appreciated.

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• forwardfor information is missing

  - by FAFA

  I use following configuration to load balance https connections, using haproxy 1.4.8. SSL offloading is done by apache. listen ssl_to_waf 192.168.101.54:443 mode tcp balance roundrobin option ssl-hello-chk server wafA 192.168.101.61:444 check listen ssl_from_waf 192.168.101.61:445 balance roundrobin option forwardfor server webA 192.168.101.46:80 check For HTTP requests this works great, requests are distributed to my Apache servers just fine. But for HTTPS request, I lose the "forwardfor" information. I need to save the client IP address. How can I use HAproxy to load balance across a number of SSL servers, allowing those servers to know the client's IP address?

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• Experience with MQ File Transfer Edition?

  - by mfinni

  We've got several processes that move files across servers - SFTP, FTP, SCP; Windows, Linux, AIX; there is a workflow component (usually require a control file with filenames and hash values to move a batch of related files). The action is often initiated on our servers to get the files, so we need to make sure they're done being written. We have some homegrown scripts to do this, but they don't always work properly, and troubleshooting, maintenance, and log review is not easy this way. There's a lot of servers, and our scripts don't have central logging or a dashboard/console/etc. We're looking into commercial products to do this. Has anyone used MQ File Transfer Edition? Another team in our company is using Aspera, does anyone have any thoughts on that, or other favored products? I have no idea what our budget is for this, yet. Just trying to get a handle on the product space from the perspective of other admins.

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• Can someone correct me about Windows 2008 DFS implementation

  - by cwheeler33

  I have 2 two Windows 2003 file servers using DoubleTake at the moment. They are in an 2003 AD domain. And each server has it's own disk set. It is time to replace the servers... I want to use Windows 2008 64bit Ent. I was thinking of using DFS-R to replace DoubleTake. The part I'm not sure about is clustering. Do I need to have shared storage if each server has a copy of the data? I want to have the data available to the same share name, so maybe I don't fully understand how DFS is set up. I currently have about 6TB of data. I expect to grow by 3TB a year on these file servers. Any resources/books that could teach me would be good to know as well.

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• Debian Linux server hangs after a week or so

  - by Alex Flo

  I have 2 Debian Linux 6.0.4 servers that have a strange behaviour: after 5-7-10 days they hang. By this I mean the servers need to be restarted and before that ping won't answer. I've been struggling with this problem for a couple of months now and here's some thoughts/what I tried without being able to solve the problem. I changed the RAM on a server. Being 2 different servers I doubt that it could be something related to hardware as a 3rd identical server won't have this problem. I logged the server load and when it crashes the load is fine (quite low) I cannot find anything in the server logs, logs are fine till the server freezes. I don't have access to console unfortunately. While I have years of admin experience I have never encountered such an issue and right now I have no idea where else to investigate. If you have an idea of what I could try in order to fix the problem please share it with me:-)

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• sonicwall nsa 240

  - by Adam

  Hi We are looking into putting a hardware firewall into a data center to protect our rack of servers. We are using the servers for terminal services and we have 2 x 1GB connections to the Internet. We have about 50 servers supporting about 250 users which will grow very soon to 500 users. We plan to purchase 2 hardware firewalls to provide HA. Do you think the Sonicwall NSA 240 with Total Secure is a good match for this in terms of performance and protection (from spyware, virus etc?) or is there a better purchase? (Maybe a Watchguard X5 or X8?)

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• Redundant Router and Load Balancing vs. DDoS attack

  - by colgatta

  With a small server farm at a hoster with great support and conditions, I worry about the increasing number of DDoS attacks against this hoster (not my web project, but other clients on the same location). I have booked a redundant router and load balancer as managed service with this hoster to share the load with all the dedicated servers. However, I was lost again today because another one's project was attacked with DDoS for hours :-( Each hour means hundreds of dollars loss whenever my adserver and tracking is not reachable. Even time-out advertising have to be paid by me but can not be resold to my clients without the servers being available. All the time, the servers, the load and traffic is OK and health, but no chance to keep this stable/online if the hoster is vulnerable. Anyone has ideas or suggestions how to protect - even against DDoS?

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• Replacing sick NTP server source and re-synching (with internal time currently 2 minutes late)

  - by l0c0b0x

  One of the external NTP servers (the primary one--currently) we're using as source seems to not be responding to NTP calls. Unfortunately, on our core router (Cisco 6509), the NTP functionality hasn't switched to the secondary NTP external server as it was expected. As a result, our core router which is pretty much our main internal NTP source is 2 minutes late. I'm planning to fix the external router issue by making the external NTP source be the one currently working. I'm wondering, how much will a 2 minute change affect my users and services? Specially since these days, we're heavily relying on certificate-based authentication. We're a Windows/Cisco shop. Internal NTP setup: [Core Router 1 / Cisco 6509]: looking out to two external NTP servers (in which the primary one is not responding to NTP calls) [Core Router 2]: Synching with Core router 1 (primary), working external router (secondary) [Other Cisco network devices]: Synching with Core router 1 (primary), core router 2 (secondary) [Domain controller(s)]: Synching with Core router 1 [All windows clients/servers]: Synching with domain controllers

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• Can a MySQL slave be a master at the same time?

  - by mmattax

  I am in the process of migrating 2 DB servers (Master & Slave) to two new DB Servers (Master and Slave) DB1 - Master (production) DB2 - Slave (production) DB3 - New Master DB4 - New Slave Currently I have the replication set up as: DB1 -> DB2 DB3 -> DB4 To get the production data replicated to the new servers, I'd like to get it "daisy chained" so that it looks like this: DB1 -> DB2 -> DB3 -> DB4 Is this possible? When I run show master status; on DB2 (the production slave) the binlog possition never seems to change: +------------------+----------+--------------+------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +------------------+----------+--------------+------------------+ | mysql-bin.000020 | 98 | | | +------------------+----------+--------------+------------------+ I'm a bit confused as to why the binlog position is not changing on DB2, Ideally it will be the master to DB3.

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• Windows VPN - NO internet access

  - by sharru

  I host a network of servers behind a Fortigate 200a firewall in the DC. I connect to those servers via a VPN connection. The problem is that when i connect to the VPN, I lose my internet connection on the local PC (windows 7). I would like to be connected to the VPN and still surf the web. i guess this means to only forward a range of ip to the VPN connection. I've read other answers on serverfault, talking about "un-check the 'Use default gateway on remote network' option in your Windows 7 PPTP network connection settings". When i do that , i get internet access but no access to the servers in the VPN. Any idea how to get both working? Should i change something on the fortigate 200a config? Do i need two networks cards? Is there a place in windows to define ip range for the vpn connection?

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