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• Apache mpm-itk Performance

  - by Matt Beckman

  I manage a bunch of VPSs with memory ranging from 1GB to 8GB. Most of these websites are Joomla websites, and the servers must support multiple sites/users/S-FTP. I use mpm-itk almost exclusively (mostly due to it's convenience in these shared environments). However, I'm aware it isn't known for performance, so I need some advice on making it faster. Due to the lack of documentation when I first went the way of mpm-itk, I included only one setting in the config, and that was to limit each user to 50 clients (the rest I left up to defaults): <IfModule mpm_itk_module> MaxClientsVHost 50 </IfModule> Are there any better alternatives available? Are there any settings supported in mpm-prefork or mpm-worker that are also supported in mpm-itk? Thanks!

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• Bluehost: 1 Minute Delays?

  - by feklee

  On Bluehost shared hosting (Apache 2.2 + FastCGI + APC), I have the problem that some requests take almost exactly one minute to respond. Yet time spent in PHP is only two seconds. To demonstrate the issue, I created a temporary test page. Sample output: When asking Bluehost support about the issue, I got the following reply: “the fastcgi process don't stay running they will only stay running for a certan period which would explain the timeouts you are seeing it traffic would spawn new ones. [...]” I understand that spawning new FastCGI processes takes some time. But almost exactly one minute? That must be some timeout. But which timeout may that be? What I want in the end: No request should take longer than five seconds to respond, even if it fails. When I asked Bluehost support to set the Apache TimeOut directive accordingly, they told me: “we do not modify the Apache Config File even on a virtual host level.”

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• Returning row values based on conditional formatting variables

  - by Mike Bodes

  I'm not entirely sure how to properly explain this, but here we go... I'm trying to create a single budgeting document that allows me to manage purchasing and reconciliation for multiple projects. I would like to create separate sheets per project and have purchased items populate on a master sheet. Using conditional formatting, I've set one of the columns to display an item's status (waiting for approval, approved, ordered, received). I would like the contents of an entire row to populate in a new sheet table once the status is set to "Received." The sheet should update descendingly. I can't attach an image because I don't have a 10 reputation.. Any help is greatly appreciated.

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• Convert NSData to primitive variable with ieee-754 or twos-complement ?

  - by William GILLARD

  Hi every one. I am new programmer in Obj-C and cocoa. Im a trying to write a framework which will be used to read a binary files (Flexible Image Transport System or FITS binary files, usually used by astronomers). The binary data, that I am interested to extract, can have various formats and I get its properties by reading the header of the FITS file. Up to now, I manage to create a class to store the content of the FITS file and to isolate the header into a NSString object and the binary data into a NSData object. I also manage to write method which allow me to extract the key values from the header that are very valuable to interpret the binary data. I am now trying to convert the NSData object into a primitive array (array of double, int, short ...). But, here, I get stuck and would appreciate any help. According to the documentation I have about the FITS file, I have 5 possibilities to interpret the binary data depending on the value of the BITPIX key: BITPIX value | Data represented 8 | Char or unsigned binary int 16 | 16-bit two's complement binary integer 32 | 32-bit two's complement binary integer 64 | 64-bit two's complement binary integer -32 | IEEE single precision floating-point -64 | IEEE double precision floating-point I already write the peace of code, shown bellow, to try to convert the NSData into a primitive array. // self reefer to my FITS class which contain a NSString object // with the content of the header and a NSData object with the binary data. -(void*) GetArray { switch (BITPIX) { case 8: return [self GetArrayOfUInt]; break; case 16: return [self GetArrayOfInt]; break; case 32: return [self GetArrayOfLongInt]; break; case 64: return [self GetArrayOfLongLong]; break; case -32: return [self GetArrayOfFloat]; break; case -64: return [self GetArrayOfDouble]; break; default: return NULL; } } // then I show you the method to convert the NSData into a primitive array. // I restrict my example to the case of 'double'. Code is similar for other methods // just change double by 'unsigned int' (BITPIX 8), 'short' (BITPIX 16) // 'int' (BITPIX 32) 'long lon' (BITPIX 64), 'float' (BITPIX -32). -(double*) GetArrayOfDouble { int Nelements=[self NPIXEL]; // Metod to extract, from the header // the number of element into the array NSLog(@"TOTAL NUMBER OF ELEMENTS [%i]\n",Nelements); //CREATE THE ARRAY double (*array)[Nelements]; // Get the total number of bits in the binary data int Nbit = abs(BITPIX)*GCOUNT*(PCOUNT + Nelements); // GCOUNT and PCOUNT are defined // into the header NSLog(@"TOTAL NUMBER OF BIT [%i]\n",Nbit); int i=0; //FILL THE ARRAY double Value; for(int bit=0; bit < Nbit; bit+=sizeof(double)) { [Img getBytes:&Value range:NSMakeRange(bit,sizeof(double))]; NSLog(@"[%i]:(%u)%.8G\n",i,bit,Value); (*array)[i]=Value; i++; } return (*array); } However, the value I print in the loop are very different from the expected values (compared using official FITS software). Therefore, I think that the Obj-C double does not use the IEEE-754 convention as well as the Obj-C int are not twos-complement. I am really not familiar with this two convention (IEEE and twos-complement) and would like to know how I can do this conversion with Obj-C. In advance many thanks for any help or information.

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• What are the best practices for service accounts?

  - by LockeCJ

  We're running several services in our company using a shared domain account. Unfortunately, the credentials for this account are widely distributed and being used frequently for both service and non-service purposes. This has led to a situation where it is possible that the services will be temporarily down due to this shared account being locked. Obviously, this situation needs to change. The plan is to change the services to run under a new account, but I don't think this goes far enough, as that account is subject to the same locking policy. My questions is this: Should we be setting up the service accounts differently than other domain accounts, and if we do, how do we manage those accounts. Please keep in mind that we are running a 2003 domain, and upgrading the domain controller is not a viable solution in the near term.

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• Add IP Address without Plesk

  - by CrackerJack9

  I have an dedicated unmanaged server and added a few IP addresses to it (allocated), and the only information my hosting company has provided is instructions on how to use Plesk to Add IP Addresses. However, one of the first things I did was uninstall Plesk (for numerous reasons). Does anyone know what exactly Plesk does when you "Add IP Address"? Does it just create an alias on the default interface (I currently only have one and the loopback)? I can manage that myself without Plesk, but I was hoping someone might know if there is anything else Plesk does. I also have DHCP Client running (eth0 is static), not sure why my hosting company put that there either, and not sure if they're related.

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• Software for failover across multiple external hosts

  - by Lin

  I have multiple webservers with the same content, hosted across different providers. However, I can't seem to find a nice, simple failover solution. Load-balancing software (Pound, HAProxy, etc.) are unnecessary, and I need the flexibility to manage over 100+ domains, so the paid DNS failover solutions I've found are too expensive. So far the simplest solution I've thought of is just to set a very low TTL (30min - 1hr) in each zone entry on my nameservers (running BIND). Then, continuously monitor each server, and temporarily remove failed servers from zone entries. But this seems like something that should be currently available. I only have root access to different VPSes running CentOS. Any suggestions? Thanks!

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• Why should I use cobbler over normal PXEBOOT server?

  - by luckytaxi

  Maybe it's me but I find it easier to manage my simple pxeboot server just by editing the default file under /tftpboot/pxelinux.cfg. I have my kickstart file available over NFS along with the DVD extracted to a centralize mount point. Other than PXEBOOT, what benefit would I get from running cobbler? It was confusing at first but I finally got the hang off it. The only benefit I see is being able to force a server to install an OS on demand. Anything else?

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• HAProxy authenticated httpchk (health check)

  - by Markel

  I am using HAProxy on EC2 and using httpchk to manage node availability. I had used a pseudo-unique path as the health check route in an attempt to make sure only my servers responded to the health check. Earlier today I had an EC2 server fall out of existence, and before the haproxy config was auto-regenerated (controller issues), Amazon had reassigned the IP to someone whom 200's every request (honeypot?), my HAProxy host then pulled the server back into rotation and started distributing some of my traffic there until the controller recovered and removed the ip from the list. TLDR; Is there a way to add a server authentication method to HAProxy's httpchk?

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• Smart card / auditable access for rack KVM tray

  - by Mark Henderson

  Is there such a thing as a KVM Tray for a standard 19" rack whose use can be validated by a smartcard (or some other auditable authentication method)? It looks like we have a security requirement where just because users have a key to the rack doesn't mean they will be allowed to use the console inside the rack, and rather than just lock the console (and keep track of who has keys), we would prefer to be able to audit the actual user that was attached at the KVM. (It's worth mentioning that I'm aware of the Raritan devices, but they surely can't be the only ones) (If these things existed, I don't think half of the tratoirs that somehow manage to infiltrate CTU on the TV show 24 would ever get away with anything)

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• Transfer VLAN tagged packets over WLAN?

  - by stefan.at.wpf

  I have the following composition of devices: [selfmade router] - ethernet - [WLAN router 1] ----- wlan ------ [WLAN router 2] WLAN router 2 has 5 ethernet ports, each as an own VLAN, so 5 VLANs. I want to manage the routing and firewalling between those VLANs at selfmade router. What technique would I use to pass the tagged vlan packets from WLAN router 2 to selfmade router? Could I use a bridge from WLAN router 2 to WLAN router 1 which itself has a bridge from WLAN router 1 to selfmade router or do I have a wrong understanding of a bridge? Thanks for any hint on this :-)

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• How to handle external and internal DNS on windows 2012

  - by ThePopcorn

  I'm trying to setup an Active Directory network on Server 2012 R2, and want AD's DNS to only be used internally (Ex: domain-controller.company.com) as well as some records that need both internal and external accessibility (Ex: mail.company.com) that use internal IP's on the internal network and finally some records that only need external access. The only solutions i have been able to think of, or look up are to either use a sub domain that handles all internal records, and use the plain company.com domain for all external records. These both seem to mean i have to manage two DNS servers separately. Is either of these the best ways or am i messing up somewhere?

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• Windows 8 Start Screen very slow after Guest Additions

  - by Renan

  I installed Windows 8 Release Preview on a VirtualBox VM, and it worked correctly. Then I installed the Guest Additions to get the correct resolutions. Now, the Start screen is very slow, takes a long time to scroll and doesn't respond well to clicks. I believe it's not my host, as it's a good machine (i7 CPU, 6 GB of RAM) and this specifically starts to happen after installing the Guest Additions. The task manager doesn't show anything wrong (i.e. no processes pegging the CPU). Any suggestions?

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• How to know which block device maps to which physical drive

  - by Karolis T.

  I have a server with software RAID 1, two hot-swap sata disks. One hard drive started showing errors, I'm thinking about removing and replacing it, only problem is that I have no idea which of the two correspond to which devices. And I can't shut the server down to find out. I have /dev/sda and /dev/sdb, /dev/sda is the failing one. Thought about doing something along the lines # mdadm --manage /dev/md0 --remove /dev/sda1 then somehow stop/suspend the drive using tuning software and try to listen which of the two stopped, but that's not gonna work in a noisy server environment. Drive panels have no LEDs. Thanks for any ideas!

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• How to allow users to monitor performance of a set of servers without touching every server?

  - by Jon Seigel

  I'm not a sysadmin, so this may be trivial. We have about 20 Windows Server 2008 R2 VMs we want to monitor centrally using Perfmon. The only issue is that the user account that's going to be doing the monitoring is not (and I assume will never be) in the Administrators group. The servers, and the user account (currently one, but could be more) are all on the same domain. Right now we're running a pilot with 5 of the servers, touching each VM manually to set the permissions, which is already getting cumbersome to manage. If we decide to roll this out to all the servers, we need a scalable solution to control access. What is the most flexible way to accomplish this? I'd like a solution that would work with 200 servers just as easily as the 20 servers we have now.

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• Good ways to restart all the computers in a remote cluster?

  - by vgm64

  I have a cluster that I manage and from time to time I get emails from each node (and head node) begging to be restarted after an automatic upgrade. Currently, my best solution so far is a shell script like: $> cat cluster_reboot.sh ssh [email protected] reboot ssh [email protected] reboot ssh [email protected] reboot ssh [email protected] reboot ssh [email protected] reboot ssh [email protected] reboot I end up just typing the root password six times, but it works, I guess. Is there a better way? Can I force the head node to reboot the computers for me?

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• Web based library management (FOSS) application

  - by pgb

  I'm looking for a FOSS web-based library management application. I want to manage the few books we have at our company, and I'm looking for applications that provide a simple web interface to: Add new books. Search for books. (Not Required) Place holds on books. My ideal would be something like Delicious Library, but web based and open source. I've looked at Koha (which I could not install), Emilda, which seems to be a dead project (last emails are from 2006 and I could not install it) and VuFind which looks awesome but doesn't provide (or I could not find) an interface to add new records to the library. Any suggestions?

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• Postgres 9.0 locking up, 100% CPU

  - by Jake

  We are having a problem where our Postgres 9.0 server occasionally locks up and kills our webapp. Restarting Postgres fixes the problem. Here's what I've been able to observe: First, usage of one CPU jumps to 100% for a few minutes Disk operations drop to ~0 during this time Database operations drop to 0 (blocks and tuples per sec) Logs show during this time: WARNING: worker took too long to start; cancelled WARNING: worker took too long to start; cancelled No Queries in logs (only those over 200ms are logged) No unusually long-running queries logged before or during Then the second CPU jumps to 100% The number of postgres processes jumps from the usual 8-10 to ~20 Matched by a spike in Postgres Blocks per second (about twice normal) Logs show LOG: could not accept SSL connection: EOF detected Queries are running but slow Restarting postgres returns everything to normal Setup: Server: Amazon EC2 Large Ubuntu 10.04.2 LTS Postgres 9.0.3 Dedicated DB server Does anyone have any idea what's causing this? Or any suggestions about what else I should be checking out?

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• What consequences to take from what i read in logfiles?

  - by Helene Bilbo

  Since some weeks i manage my first Webserver, a Seaside application behind an Apache proxy on Linode, and i installed logwatch to send me daily logs. Where can i get information on when i have to act as a consequence of what i read in these logwatch reports? For example i read that all kinds of people try to login on funny nonexisting accounts or all kinds of webcrawlers test for nonexisting cms login pages, some ip adresses get banned and unbanned by fail2ban... I assume that's normal? Is it? But how do i know that i probably have to do something? What do i look for in the logs?

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• Syntax for file and process exclusions in Forefront Endpoint Protection?

  - by Massimo

  I can't seem to find an official and up-to-date documentation on how to set up file and process exclusions in Forefront Endpoint Protection 2012. For file types, which of these will work? Are they the same? ext .ext *.ext What about wildcards? .e?t .e* .*t For file paths, which wildcards are allowed and how do they work? C:\path* C:\path\s*e C:\path\somef?le C:\*\somefile C:\pa*\somefile C:\pa?h\somefile *\path *:\path For processes, can wildcard be used when specifying the file name? Same syntax as file paths? Also: I read in this post that, as of October 2009, Real Time Protection ignored wildcards; is this still true for the 2012 version?

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• Best way to replicate / mirror 100s of databases in SQL 2005

  - by mrwayne

  Hi, I currently host around 400-500 SQL 2005 databases of varying sizes (1-10 gig) each. I am aware of most of the different methods available and the general pros/cons of mirroring, log shipping, replication and clustering, but i am not aware of how well they tend to perform when its employed at the size i have specified (400-500 unique databases). Does anyone have any good advice on what is likely the best method for having the ability to fail over to another server with this sort of setup? Fail over does not need to be immediate, i'm just looking for something better than taking backups every day and moving them to storage. I'm preferably looking for something that would also makes it easy to manage the databases in bulk (as opposed to one at a time). Thanks for your input!

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• Apache hanging with MaxClients is reached

  - by Ash White

  My Apache 2.2 (preform MPM) is hanging when MaxClients is reached, rather than queueing up requests and serving them when child processes become free. When this happens, the web server is totally unresponsive until it is manually restarted. The server stack is Ubuntu 8, MySQL 5, PHP 5. Hardware is Dual Xeons (2.8) with 2GB of RAM. It serves 30,000 - 50,000 pageviews per day. Static images, CSS, and JS are offloaded to a separate server and PHP is cached using eAccelerator. The HTML output of many pages is cached to the filesystem. Relevant Apache directives: KeepAlive On MaxKeepAliveRequests 50 KeepAliveTimeout 2 StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxRequestsPerChild 2000

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• Bonjour/mDNS Broadcast across subnets

  - by Matthew Savage

  I have just setup a new OSX Server in our office and verified that everything is working fine over our wired network (192.168.126.0/24). The problem that I am having is that our clients (Mac Laptops) are mainly connected via Wireless, which are running on a different subnet (192.168.1.0/24), and the mDNS Broadcast isn't reaching this subnet. The network configuration is somewhat foreign to myself (I don't manage the network in this location, but as of just recently the servers), however I don't believe there is any firewalls or routing rules between the two subnets which might cause the traffic to be rejected. I'm wondering if this is simply the mDNS broadcast not able to broadcast over the two different subnets (I'm still reading up on broadcast to understand it more) or there is something else which I might be able to try.

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• MySQL is killing the server IO.

  - by OneOfOne

  I manage a fairly large/busy vBulletin forums (~2-3k requests per second, running on gigenet cloud), the database is ~ 10 GB (~9 milion posts, ~60 queries per second), lately MySQL have been grinding the disk like there's no tomorrow according to iotop and slowing the site. The last idea I can think of is using replication, but I'm not sure how much that would help and worried about database sync. I'm out of ideas, any tips on how to improve the situation would be highly appreciated. Specs : Debian Lenny 64bit ~12Ghz (6 cores) CPU, 7520gb RAM, 160gb disk. Kernel : 2.6.32-4-amd64 mysqld Ver 5.1.54-0.dotdeb.0 for debian-linux-gnu on x86_64 ((Debian)) Other software: vBulletin 3.8.4 memcached 1.2.2 PHP 5.3.5-0.dotdeb.0 (fpm-fcgi) (built: Jan 7 2011 00:07:27) lighttpd/1.4.28 (ssl) - a light and fast webserver PHP and vBulletin are configured to use memcached. MySQL Settings : [mysqld] key_buffer = 128M max_allowed_packet = 16M thread_cache_size = 8 myisam-recover = BACKUP max_connections = 1024 query_cache_limit = 2M query_cache_size = 128M expire_logs_days = 10 max_binlog_size = 100M key_buffer_size = 128M join_buffer_size = 8M tmp_table_size = 16M max_heap_table_size = 16M table_cache = 96

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• Filezilla/Puttygen doesn't recognize private key file

  - by devzoner

  I have generated a key for an Ubuntu Virtual Machine running on Azure Cloud Services http://www.windowsazure.com/en-us/manage/linux/how-to-guides/ssh-into-linux/ openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout myPrivateKey.key -out myCert.pem When loading the private key into Filezilla, it asks me to convert the format, however, when converting the key it fails, the same happens with puttygen from linux console, using this: puttygen myPrivateKey.key -o myKey.ppk In both cases I have the following error: puttygen: error loading `myPrivateKey.key': unrecognised key type By the way, this key doesn't have a passphrase. I found an old thread about it, but I'm using 0.6.3 version which is newer than what this thread recommends: http://fixunix.com/ssh/541874-puttygen-unable-import-openssh-key.html I've managed to solve this issue by using another gui client Fugu for Mac, but one of my co-worker uses windows and I still have to figure this out. Since Filezilla is the de-facto ftp client, I thought it would be easier to solve it there. Thanks

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