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• Slow browsing through IE on Windows Server 2012

  - by Volodymyr

  We've run into strange issue on the freshly installed servers. H/W: IBM server X3550 M4 7914; OS: Windows Server 2012 Std. Then we try to browse on the servers thru IE, not all sites are opened or it takes too long time to open the page, i.e. very few of them can be opened. Local FW are disabled. Servers are in a new subnet and traffic is allowed for it. VLAN is configured properly Another Windows Server 2012 host is running OK and Internet access works fine, but it is VM running on Hyper-V 2012. No proxy is used on the network. At the same time, if one tries to establish telnet session to any site on 80/443 ports - it does work. Google works as well. I've tried to configure single Qlogic adapter to check if the issue remains - it does. Teaming is configured with the means of QLogic, not by built-in functionality. IE Enhanced Security is disabled. IE settings were reset, more than once. Why would certain sites work while others not - Idk. I also tried to disable ecncapability and restart server - no luck netsh int tcp set global ecncapability=disabled Any thoughts? UPD1 VMQ is disabled. Servers are not running Hyper-V. UPD2 Servers were rebuilt from scratch, got a mail a few mins ago. Issue still remains. Teaming is now configured with the means of Windows Server 2012.

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• Windows/IIS Hosting :: How much is too much?

  - by bsisupport

  I have 4 Windows 2003 servers running IIS 6. These servers host a bunch of unique web sites (in that they are all different in build/architecture/etc). The code behind these sites range from straight HTML, classic ASP, and 1.1/2.0/3.x flavors of .NET. Some (most) of the sites use a SQL backend, which is hosted on one or two different servers – not the IIS servers themselves. No virtualization on these servers and no load balancing for these particular sites. The problem I’m running into is coming up with some baseline metrics to determine, or basically come up with a “baseline score” to know when a web server has reached its hosting limit. Today, some basic information about each server is used: how much bandwidth does the server pump out, hard drive space availability, and basic (very basic) RAM & CPU utilization (what it looks like at peak traffic times.) I would be grateful if those of you that are 1000x smarter than I am could indulge me with your methods of managing IIS environments. Whether performance monitoring specifics, “score” determination as I’m trying to determine, or the obvious combination of both. Thanks in advance.

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• Requests are making it to my app server, but not into node.js -- why?

  - by Zane Claes

  I detailed in this question on StackOverflow how some random requests are not making it from the client to my Node.js app server, resulting in a gateway timeout. In summary, identical requests are, at random, not even making it far enough to trigger a console.log() in my first line of express middleware. I need to narrow down the problem, though, to find out WHERE the traffic is being lost and it was suggested that I try a packet sniffer on my app servers. Here's my setup: 2x Load Balancers (m1.larges) 2x node.js servers (also m1.large) Here's what's interesting/unusual: the node.js servers started as PHP servers with an Apache stack and continue to serve PHP files for my domain (streamified.me). However, I use a little httpd.conf magic on the app servers so that requests to api.streamified.me get routed over port 8888 to the node.js server: RewriteCond %{HTTP_HOST} ^api.streamified.me RewriteRule ^(.*) http://localhost:8888$1 [P] So, the request hits the load balancer = goes to an app server = gets routed to port 8888 if it's intended for the API = gets handled by node.js So, in the same httpd.conf file, I turned on RewriteLogLevel 5 and then created a simple PHP+CURL script on my localhost to hit my api.streamified.me with a random URL (which should cause node.js to trigger a simple "not found" response) until it resulted in a Gateway timeout. Here, you can see that it has happened -- and the rewrite log shows that the request was definitely received by the app server and forwarded to port 8888... but it was never received by node.js (or, at least, the first line of code in the first line of middleware never gets it...) Image Link: http://i.stack.imgur.com/3OQxS.png

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• Windows Not Honoring DHCP Scope

  - by jerhinesmith

  Please bear with me as I'm not a networking person by trade. Our current configuration at work includes two Windows Servers serving as DHCP/Active Directory servers (if that makes sense) -- one replicating from the other. On both machines, the DNS resolution is set up as: Main Windows Box (10...* address) Public IP Address (for Verizon) Public IP Address (secondary Verizon) Secondary Windows Box (10...* address) Assuming our domain is foo.com, we maintain the foo.com website on a hosted VPS with it's own IP address. The problem is that even though bar.foo.com is an internal server and is defined in DNS on the Primary Windows machine, when I ping bar or even bar.foo.com it resolves to the hosted IP address instead of the 10.* address. I tried taking both of the Public IP addresses out of the DHCP scope, and that seemed to work, but it completely slowed down access to any external sites, so that wasn't acceptable. I also tried adding the two Windows machine as the DNS servers on my desktop. That too worked, but I'd rather not have everything enter their DNS servers, as the above setup should theoretically be working. Is there anything I could check to see why pinging bar.foo.com isn't resolving to the DNS entry on the Windows machines? Here's a summary of the ping results, if they help: Pinging from servers with static IP bar.foo.com resolves with correct IP address Pinging from linux machines not joined to the domain bar.foo.com resolves with correct IP address Pinging from user's desktop machines, joined to the domain, but dynamic IP bar.foo.com resolves with incorrect IP address This is driving me crazy!

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• Using PHP to connect to RADIUS works on one server but not another

  - by JDS

  I have a fleet of webservers that server a LAMP webapp broken into multiple customer apps by virtualhost/domain. The platform is Ubuntu 10.04 VM + PHP 5.3 + Apache 2.2.14, on top of VMware ESX (v4 I think). This stuff's not too important, though -- I'm just setting up the background. I have one customer that connects to a RADIUS server for authentication. We've found that the app responds as if some number of web servers are configured correctly and some are not. i.e. Apparently random authentication failures or successes, with no rhyme or reason. I did a lot of analysis of our fleet, and resolved it down to the differences between two specific web servers. I'll call them "A" and "B". "A" works. "B" does not. "Works" means "connects to and gets authentication data successfully from the RADIUS server". Ultimately, I'm looking for one thing that is different, and I've exhausted everything that I can come up with, so, looking for something else. Here are things I've looked at PHP package versions (all from Ubuntu repos). These are exactly the same across servers. PECL package. There are no PECL packages that aren't installed by apt. Other libraries or packages. Nothing that was network-related or RADIUS-related was different among servers. (There were some minor package differences, though.) Network or hosting environment. I found that some of the working servers were on the same physical environment as some not-working ones (i.e. same ESX containers). So, probably, the physical network layer is not the problem. Test case. I created a test case as follows. It works on the working servers, and fails on the not-working servers, very consistently. <?php $radius = radius_auth_open(); $username = 'theusername'; $password = 'thepassword'; $hostname = '12.34.56.78'; $radius_secret = '39wmmvxghg'; if (! radius_add_server($radius,$hostname,0,$radius_secret,5,3)) { die('Radius Error 1: ' . radius_strerror($radius) . "\n"); } if (! radius_create_request($radius,RADIUS_ACCESS_REQUEST)) { die('Radius Error 2: ' . radius_strerror($radius) . "\n"); } radius_put_attr($radius,RADIUS_USER_NAME,$username); radius_put_attr($radius,RADIUS_USER_PASSWORD,$password); switch (radius_send_request($radius)) { case RADIUS_ACCESS_ACCEPT: echo 'GOOD LOGIN'; break; case RADIUS_ACCESS_REJECT: echo 'BAD LOGIN'; break; case RADIUS_ACCESS_CHALLENGE: echo 'CHALLENGE REQUESTED'; break; default: die('Radius Error 3: ' . radius_strerror($radius) . "\n"); } ?>

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• What is the best IP/Subnet set up strategy for a multi-server webhosting setup?

  - by Roy Andre

  Sorry for the mixed-up title, but let me try to explain better: We run a hosting solution, which until now has supported shared hosting and VPSes. Easy enough. We are now getting larger clients which require a more complex setup. We have more or less settled the server-setup itself, which will consist of: 1-2 Frontend Proxy/Load balancing servers 2+ Application servers 1 Database server 1 optional Memcached server The issue we are dealing with is to agree on a flexible and easy-to-maintain IP setup. So far we've been into VLAN'ing the internal servers in its own subnet, we've though of assigning an official IP to each server, and so on. What will be the best approach here? Any best practices? Using one official IP on the Frontend server, and then just set up an internal subnet for the servers behind that? We could then just NAT in any eventual sources required to access for instance the DB server directly over 3306.

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• rsyslog forward all except ldap

  - by Brian

  I have Centos 6 servers running openLDAP. In the rsyslog.conf, I forward the logs to my central server with this line: *.* @10.10.10.10:514 openldap seems incredibly chatty. I have 3 servers in a multi-master cluster. Those 3 servers generate twice as many logs as my other 80 servers combined. I have been unsuccessful in figuring out how to tell openLDAP to use a sensible log level. (we never specifically set the log level) Since these are my main authentication sources, I'm a bit hesitant to "play around" with them. Is there a way to tell rsyslog to forward everything EXCEPT LOCAL4?

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• BIND having trouble resolving service.graphicly.com

  - by Keith Burgoyne

  Since about two weeks ago, we haven't been able to resolve service.graphicly.com: dig @192.168.0.12 service.graphicly.com ; <<>> DiG 9.3.4-P1 <<>> @192.168.0.12 service.graphicly.com ; (1 server found) ;; global options: printcmd ;; connection timed out; no servers could be reached Digging on the name servers listed for graphicly.com shows that service.graphicly.com is a CNAME to takecomicsadmin.cloudapp.net. Digging on cloudapp.net's name servers seems to fail: dig @NS1.LIVEDNS.MSFT.NET takecomicsadmin.cloudapp.net ; <<>> DiG 9.3.4-P1 <<>> @NS1.LIVEDNS.MSFT.NET takecomicsadmin.cloudapp.net ; (1 server found) ;; global options: printcmd ;; connection timed out; no servers could be reached Somehow, my home ISP's name servers can resolve service.graphicly.com without issue. Has anyone else noticed this problem? Does anyone know what the cause of this problem could be? Thanks!

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• system center operations manager (SCOM) role combinations

  - by KAPes

  We are evaluating system center operations manager 2007 R2 product, and would like to know what all roles can be combined onto single server. Like root management server and reporting servers can be on one box or not? my environment is like 450 servers mostly Exchange and Domain Controllers plus few OCS servers.

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• Control scheduled tasks execution

  - by SJuan76

  We are a small shop. I am mainly a programmer, but due to being the only one that risks to manage our servers, the task has fallen on me (yet I it is still a secondary function so I cannot give it too much time). Over the course of years we have needed to create a decent number of .bat scripts that run as scheduled tasks in our servers (dump DB servers, SVN servers, copy files, etc.). Manually checking that everyone has proceeded ok is a time consuming task. I could get them to send an email on completion, but then I would get swarmed by lots of emails each morning. If I setup them to only e-mail on failure, I might miss the instances where the error causes the task to abort (or even not to start). Are there other alternatives? We are currently using Windows 2003 R2, but we are thinking of adding some Linux server soon, so a cross-platform solution would be best.

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• cPanel Redundacy

  - by bogha

  hi, what information should i know to do the following: we will have 2 servers, each one will have a cPanel WHM installed and 2 will have DNS, we want to insure that redundancy is achieved on both servers, means the servers should work as active/standby unit. 2 cPanel active/standby 2 DNS active/standby also does this have any impact on the mySQL database, do we have to buy another server to use it as the mySQL database or it's possible to sync all the cPanel information from one server to another. thank you.

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• Standalone server setup for compute capacity

  - by mikera

  I'm developing an application for my company that will require a lot of compute capacity (running some very big mathematical calculations), and looking for some form of server setup to do this. For various reasons, we want to run this on-site in our office rather than hosting it externally. It's been a while since I last had to set up my own servers so I thought I would tap into the collective wisdom of serverfault! My broad requirements are: Budget $30-50k, with an aim to get as much compute capacity as possible for that budget 64-bit servers suitable to run Ubuntu Linux + Java Some relatively standalone rack that can be installed in secure office space Fast/low latency network connections between the servers, but don't really care about connectivity to the outside world Storage capacity shared between the servers - they don't necessarily need their own storage providing they can be booted from a common image Downtime can be tolerated (since the calculations are run in batch mode) The software itself is fault-tolerant, so there is no need for extra resiliency in the server setup (cheap replaceable commodity parts will be fine in general) Given these requirements what kind of setup would you recommend and why?

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• How do you keep track of installed/used software/systems/services in your organisations server infr

  - by edgars

  I'm interested in any software, experience or guidelines listed that help to deal with listing installed services, their primary user (or business person that is responsible for this service), domain names, ip addresses, ports in your servers. Servers are both Windows and Linux, so licenses are also good to track with all of this information. Scale of the infrastructure in question - 20-50 servers. Currently we have no better idea as to use Excel for it.

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• Remotely Trigger WSUS Downloaded update Installation

  - by Zypher

  This has been bugging me for a while. We have our Servers set to download only windows updates to stage them to be installed during one of our bi-monthly patch windows. I have looked high and low for a way to trigger the installation remotely on the servers during this time so that I don't have to log into a hundred or more servers and click on the "Install Updates Now" balloon. Anyone know of a way to trigger the update installations remotely?

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• how to optimize apache on web-server

  - by Prakash

  how can I optimize the server with following configuration. It takes too much time to load a page. IBM X3200 M3 Server - 1 Intel Xeon Processor with 4 GB Ram Below is my current configuration for apache: Start Servers: 5 (Default) Minimum Spare Servers: 10 Maximum Spare Servers: 20 Server Limit: 500 Max Clients: 500 Max Requests Per Child: 10000 (Default) Keep-Alive: On Keep-Alive Timeout: 5 Max Keep-Alive Requests: 100 Timeout: 200

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• nginx hashing on GET parameter

  - by Sparsh Gupta

  I have two Varnish servers and I plan to add more varnish servers. I am using a nginx load balancer to divide traffic to these varnish servers. To utilize maximum RAM of each varnish server, I need that same request reaches same varnish server. Same request can be identified by one GET parameter in the request URL say 'a' In a normal code, I would do something like- (if I need to divide all traffic between 2 Varnish servers) if($arg_a % 2 == 0) { proxy_pass varnish1; } if($arg_a % 2 == 1) { proxy_pass varnish2; } This is basically doing a even / odd check on GET parameter a and then deciding which upstream pool to send the request. My question are- What is the nginx equivalent of such a code. I dont know if nginx accepts modulas Is there a better/ efficient hashing function built in with nginx (0.8.54) which I can possibly use. In future I want to add more upstream pools so I need not to change %2 to %3 %4 and so on Any other alternate way to solve this problem

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• How (much) is virtualization used today?

  - by BLAKE

  I know that where I have worked, I have pushed alot for virtualizing our servers. I think that it is much easier to implement and maintain than physical servers. I have been using Microsoft's Virtual Server 2005 R2 since it was released. Right now at my workplace we have 12 VMHosts that hold about 55 VMs. We have 6 other servers that we have been unable to convert to VMs. I want to know how other people in our field view virtualization. I know that I have had developers dislike the notion of VMs claiming major performance hits. What do other Sys Admins think about virtualized servers?

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• Diagnosing Random Network Lag

  - by uesp

  I'm having trouble diagnosing some random lag on a 6 server LAMP cluster serving a MediaWiki site. While we're serving some 100 pages/sec the servers themselves are running fine with less than 0.5 load, no locked processes, no paging, no errors being logged, etc.... Lag is present on all servers and is random: one minute its fine the next it's there. DNS lookups on the servers are randomly slow. For example time nslookup google.com varies randomly from a few milliseconds to several seconds and sometimes times out entirely. While we use IP addresses internally on the cluster this may be a symptom of the root issue. We are not running our own DNS server. The Apache server-status pages randomly lag or time out. Benchmarking using ab between servers shows a few loads sometimes take 3000 ms (almost exactly). Benchmarking server-status on the local server itself usually shows no issue (it showed a lag only once among a few hundred tests). The servers are sitting behind a switch and a firewall which I don't have any access to so I don't know their setup or status. While we are under heavier than normal load a 2 Mbps incoming and 20 Mbps outgoing traffic shouldn't be stressing the switch or firewall should it? My feeling is that it is the switch/firewall or something above them in the ISP like their DNS but can't confirm it. I need some other tests or methods of diagnosing this lag to try and narrow down the ultimate cause.

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• Simple Windows+Linux server provisioning? Chef/Puppet/Ansible etc

  - by Andrew

  I'm primarily a developer, part time devops; and manage servers here and there for my projects. I want to automate provisioning of web/app/database servers going forward for my projects I manage a mixture of both Windows and Linux servers (VPS, cloud and dedicated) I've looked at investigated Chef/Puppet/Ansible briefly; and I am wanting to find something that: Is easy to learn and understand. I don't want to invest weeks into understanding a complicated piece of tech. Ideally does not require a server ("master server") to hold the configurations Supports provisioning of Windows and Linux servers Comes with suitable documentation to get started Does anyone have any advice on what tool is best suited? Thanks

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• Mounted NFS directory not writable by Apache / PHP

  - by phpfour

  Need some help here with NFS. Here's what I have (all servers running CentOS 5.6 with SELinux): 172.17.20.1 - Primary server with static IP. Varnish redirects requests to the web servers. 172.17.20.2 - Web server 1 172.17.20.3 - Web server 2 The application residing on the web servers is running Drupal and I need both of them to share the same files directory. I have created a folder in 172.17.20.1 called /var/nfs with root user. Here is my /etc/exports content: /var/nfs 172.17.20.2(rw,sync,no_root_squash) 172.17.20.3(rw,sync,no_root_squash) On both the web servers (172.17.20.2/3), I have it mounted like below: [root@web2 ~]# mount ... 172.17.20.1:/var/nfs on /mnt/nfs/var/nfs type nfs (rw,sync,hard,intr,addr=172.17.20.1) On all the servers, I've added the user apache to the root group to get the desired write access: [root@main ~]# cat /etc/group root:x:0:root,apache .... .... apache:x:48: [root@web1 ~]# cat /etc/group root:x:0:root,apache .... .... apache:x:48: Despite all this, when I try to write files into the /mnt/nfs/var/nfs folder from Drupal/PHP, it cannot write to it. I even tried with a simple PHP upload script but it doesn't work, so the problem is not with Drupal. Any help you guys can do is much appreciated. I've spent hours and hours with it, without any success :( Thanks in advance.

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• poorman's redandunt domain name server array

  - by John

  Can I configure my domain, example.com's name servers as: ns1.dyndns.com ns2.dyndns.com ns1.opendns.com ns2.opendns.com That is, combining free dns services to create a redundant name server array? Note these name servers from different companies are not aware other companies' name servers also serve our domain. In case one company, say, ns1(2).dyndns.com is down, will people experience interruption when visiting my example.com? If one name server is unreachable, the next name server will be tried, or?

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• How faster is using an internal IP address instead of an external one?

  - by user349603

  I have a mailing list application that sends emails through several dedicated SMTP servers (running Linux Debian 5 and Postfix) in the same network of a hosting company. However, the application is using the servers' external IP addresses in order to connect to them over SMTP, and I was wondering what kind of improvement would be obtained if the application used the internal IP addresses of the servers instead? Thank you in advance for your insight.

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• Log viewer server and client

  - by Scott Crooks

  I'm looking for a log viewing solution for (mostly) Linux and (preferably) Windows too. I want to be able to centralize the log information for a lot of servers so that people in the company can see what's going on for different servers. I would guess this would involve having a central server which accepts information from the various computers / virtual machines with (perhaps) a running daemon on each of the servers. Does such a software exist?

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• Virtualized Development Server for simulating 3-Tier Environment

  - by chris.cyvas

  Hello, I am thinking about buying a new server based development box for development (redundantly redundant, I know ;)). Ideally, I want to run something like ESXi or Xen Hypervisor at the lowest level. Then I want to add (at least) 5 Linux VM's for the following uses: 2 Web Servers 2 Application Servers 1 Database Server I want to load balance the 2 web servers and the 2 application servers and (somewhat obviously) they need to be all networked together to simulate a production environment. Also, it used to be the case that the recommendation was to put each VM on it's own hard drive, but I'm not sure that holds water anymore. Any advice? Does anyone have any advice on how to pull this off? Gotchya's, LookOuts!, etc? Thanks!

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• Nagios - How to display specific monitors for a specific user/contactgroup while these monitors will also be displayed to the Admin team?

  - by Itai Ganot

  I have a Nagios server which monitors many servers, a number of the servers is used for QA matters. I'd like to allow the QA team access to the Nagios UI and i want them to be able to view only monitors which are related to their work. More than that, these servers which i want the QA team to monitor should be displayed for the admins group as well (as it is configured at the moment) in addition to the QA team. Is that doable?

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