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• Steps to deploy a custom routing protocol

  - by user134589

  I'm a Ph.D Student and I'm researching a Service Centric Networking architecture with resourceallocation on a large scale. What I'm looking to do is expand an existing routing protocol like OSPF with extra fields and some new message types that I need for communication between Nodes. I want to manipulate the cost of a network link and I want paths to be calculated like in OSPF V2/v3, but using the cost that my algorithms have calculated. What I have I have the source code of OSPF from Quagga. I am assuming I can edit this code how I want, including packet structures and creating new types. Yes, I am aware it won't be easy but this is a 6 years research project and I am eager to develop something new, to move forward. What I need I would like to know how I can deploy the edited OSPF source files I have (written in C) on any type of server. I have a large testbed environment available with hundreds of virtual nodes and pretty much any OS out there. So if I want to test my extended protocol, how do I make all the nodes in a network use this to communicate? I do not understand what parts of the kernel I need to edit here. I tried searching for days now and I am unable to find how to deploy a non-existing routing protocol, without the use of an application-level framework. If somebody could push me in the right direction that'd be awesome. note: I need this to be a routingprotocol and not an application, since I want this to work on op of the network layer for performance reasons. Thanks!

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• Migrating WebLogic 10.3.0 to new host. Slow managed server startup times

  - by wadevondoom

  We are migrating our Blue Martini Commerce application (only supported on WebLogic 10.3.0) to a new host (Redhat 6.3 on a VMWare ESX vm). We are seeing extremely slow start up times for our managed server(s) that is basically 20x slower than our current production. As a for instance the Publish managed server takes ~30 - 45 seconds in current production and in the new environment it takes ~10 minutes. The setup uses the same domain structure and JVM as the current production environment. The same setup files are used. We use jdk1.6.0_33 on 64 bit architecture. We used the generic 64bit weblogic installer and used pack / unpack utilities to migrate the domain. The JAVA_OPTS to start this server are: "-d64 -Xms256m -Xmx512m -XX:PermSize=48m -XX:MaxPermSize=256m" The sysadmins have checked /etc/sysctl.conf and /etc/limits.conf to ensure we were not hitting some kind of process limit. As I am not sure what this managed server does from a Blue Martini perspective during the phase of startup I also had the DBA check to ensure that Oracle RAC (11.2.0.3) wasn't also hitting some kind of process limit or if there was a tns listener issue. The new host is quite a bit stricter with their server lock downs so there are a few differences.... Redhat 6.3 in new env, RH 5.7 in current SElinux is targeted in new env and disabled in current VM in new env and dedicated hardware in current iptables disabled in current. It was enabled in new prod but I had them disable it just in case I apologize for not being more specific. I am mostly hoping got some tips. I do not have the typical root access I would normally have in this environment. I am just hoping got a path forward. I did a few 'kill -3' to see if there are blocked threads and I got nadda. The service works for all intents and purposes it is just painfully slow. Thanks you all in advance for reading and best regards. Wade

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• How to turn off Windows Azure's "This copy of Windows is not genuine" message?

  - by Sid

  Is there any setting/configuration item to avoid Windows Azure from printing that error on the screen or detecting it? I've put a screenshot below that shows the message when you RDP into the web role. My web role runs on Windows Azure Guest OS 1.17 (variant of Windows Server 2008 SP2) Background: I was explaining our architecture to some outside engineers (NDA'd and all) and had to demystify the webrole as they were unfamiliar with Azure. I RDP'd into the VMs running the Web Role when one of their engineers gasped "are you guys running pirated copies of Windows in the cloud?" I also noticed that within the RDP screen, the Azure machines had "This copy of Windows is not genuine" on the bottom left corner. Now obviously, Microsoft is running their own OS in their own datacenter with no influence from me. So no 'piracy' here, despite that obvious warning. However, they seemed so distracted by this ("how can it be? really? hmmm?") that we wasted more time talking about it than the actual matter at work. Like I said, they have little exposure to Azure but have value add elsewhere. I want to get rid of this so I don't have to explain this in the future. PS Microsoft: If you're going to modify Windows Server <XYZ> into Windows Azure <A.B> , you should also modify the code that verifies product integrity.

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• tomcat vs FULL J2EE Solutions

  - by jrhickey

  We are getting ready to make a major revision in our Web Application architecture which currently is running on JBoss 4.2. At first we were looking at moving from 4.2 to JBoss 6 but after some research tomcat may be a better solution for us. My first question is their anything that JBoss can do that tomcat cannot do assuming you are using the correct plugins. We do not really use EJB's in our solution and it would appear there are simple plugins for web services, JMX and other features. Tomcat appears to have much better support, faster upgrade cycles and many, many books. Since there is less to the system it also seems much easier to support from an admin point of view. What am I missing? The main features we want to enable are better clustering support and session replication / persistence. We will consider other application servers as well such as Glassfish / Geronimo. quote form a web article: Apache Tomcat is the world’s most widely used web application server, with over one million downloads per month and over 70% penetration in the enterprise datacenter. Tomcat is used to power everything from simple one server sites to large enterprise networks.

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• Developer hardware autonomy in a managed desktop environment [closed]

  - by Troy Hunt

  I’m looking for some feedback on how developer PCs are managed within environments that have a strict managed desktop policy (normally large corporations). For example, many corporate environments control the installation of software and the deployment of patches and virus updates through a centralised channel. This usually means also dictating the OS version and architecture (32 bit versus 64 bit) which will likely also mean standardised hardware configurations. I’m particularly interested in feedback from developers who work in this sort of environment but have a high degree of autonomy over their machines. This might mean choosing your own hardware vendor, OS type and version and perhaps how the machines are built and maintained. I have several specific questions: How do you satisfy the needs of security, governance etc whilst maintaining your autonomy? For example, how do you address concerns about keeping virus definitions and OS patches up to date? Do you have a process for gaining exemption from standard desktop builds and if so, what do you need to demonstrate in order to get this? How have you justified this need to the decision makers? Essentially, what is the benefit to your role as a developer by having this degree of autonomy? Thanks very much everyone. Update: There's a great post from Jean-Paul Boodhoo which addresses the developer tool component of the quesiton here: http://blog.jpboodhoo.com/TheFallacyOfTheStandardizedDeveloperMachineimage.aspx

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• Measuring performance indicators on a cluster

  - by Aditya Singh

  My architecture is based on Amazon. A ELB load balancer balances POST requests among m1.large instances. Every instance has a nginx server on port 80 which distributes the requests to 4 python-tornado servers on backend which handle the request. These tornado servers are taking about 5 - 10ms to respond to one request but this is the internal compute time of every request. I want to put this thing on test and i want to measure the response time from ELB to upstream and back and how does it vary when the QPS throughput is increased and plot a graph of Time vs. QPS vs. Latency and other factors like CPU and Memory. Is there a software to do that or should i log everything somewhere with latency checks and then analyze the whole log to get the stuff out. I would also need to write a self-monitor which keeps checking the whole response time. Is it possible to do it with a script from within the server. If so, will it be accurate ?

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• SRM 4 Test Fails with message for some VM : Error: A specified parameter was not correct.

  - by Setesh

  Here are my architecture : For the protected site 4 Host VSphere Enterprise Plus, each one with 2 HBAs FC connected to the switch fabric, connected to an EMC CX4-120 1 VCenter 1 SRM For the recovery site 2 Hosts Vsphere 4 1 Vcenter 1 SRM 1 CX-4-120 The CX4-120 is connected to the second CX4-120 with ISCSI and the MirrorView / Asynchronous. I synchronise for the time 6 Lun on a FC DAE, 2 on a S-ATA DAE I have allocated 30% of the amount synchronised LUN for the SNAPSHOT us, but I have allocated them only on my S-ATA II DAE. It does not make a problem, my snapshot are correctly active. All the installation is new (hardware and software), installed in January with the last files available in download. I have a strange problem, and it's random, sometimes when I run a test on my RP, some VMs have this error : Error: A specified parameter was not correct. I don't know where to look. Any help is appreciated... PS : I have checked on all the VMs, no Floppy disk or CD attached. PS2 : There is severals VMs with RDM and OCFS2 filesystems on it.

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• Scaling a LAMP website hosted on EC2

  - by Gublooo

  Hello, I'm very new to all this - I've recently managed to launch my website on EC2. As next step, I want to learn how to scale the website. I have a general idea but wanted some input from the experts about how to go about it. My website is based on LAMP but also has Red5 server which allows users to record messages and also used for playing them back. Currently this is the architecture I'm planning to setup for initial scaling. Deploy four small EC2 instances for the following purposes: Instance-1: On this instance I will run the MySql database Instance-2: On this instance I will run the red5 server Instance-3 & Instance-4 These 2 instances will be used to deploy the website and will have Apache running on them. They will communicate with the mysql server on Instance-1 and red5 server on Instance-2 using the internal IP address. As an when required, I will launch another instance of the same EBS - I will have EBS of say 50 GIG where all the mysql data will be stored. Also red5 will use this EBS to store the video messages Load-Balancer - Use the load balancer provided by Amazon to load balance Instance-3 and Instance-4 This is what I have in mind. I could be way off so please bear with me. Also I have not taken into account the case of scaling MySql server as I currently have no idea about how that will be done and whether or not it is necessary initially. I am aware that Amazon provides auto scaling and mysql scaling as well but I dont want to get into that right now. Your feedback is appreciated Thanks

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• Upgrade to Q9550 or i7 920 on a budget?

  - by evan

  I'm planning to upgrade my computer and torn between maxing out the system I have or investing in the X58 architecture. I'm currently using a E6600 Core 2 Duo with 4GB of RAM (800mhz) on an Asus PK5-E motherboard which I built two years ago. My original plan was that one day I'd upgrade machine to 8GB (1066mhz, the max the PK5-E allows) and to the Core 2 QuadQ9550 to give the machine a good four years of life. However, that was before the i7 came out. I use my computer mainly for software development , which I do inside Virtual Machines, and the i7 seems ideal for that because it no longer is limited by the speed of the FSB? And when I looked into it, getting 8GB DDR3 RAM isn't much more expensive than the 8GB of DDR2 and the i7 920 is comparable in price to the Q9550, which doesn't make much sense to me? So the question is it worth swapping the motherboard out for around $250 and upgrading all three components or using that money on SSD or 10rpm drive for the existing system's OS/Apps/Virtual Machine drive? Or just put the $250 towards a completely new machine in a year or two? Would the i7 really give that much of boost compared to the Q9550 for what I'd be using it for? Thanks in advance for your input!!!

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• MysqlTunner and query_cache_size dilemma

  - by wbad

  On a busy mysql server MySQLTuner 1.2.0 always recommends to add query_cache_size no matter how I increase the value (I tried up to 512MB). On the other hand it warns that : Increasing the query_cache size over 128M may reduce performance Here are the last results: >> MySQLTuner 1.2.0 - Major Hayden <[email protected]> >> Bug reports, feature requests, and downloads at http://mysqltuner.com/ >> Run with '--help' for additional options and output filtering -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.5.25-1~dotdeb.0-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in InnoDB tables: 6G (Tables: 195) [--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17) [!!] Total fragmented tables: 51 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 1d 19h 17m 8s (254M q [1K qps], 5M conn, TX: 139B, RX: 32B) [--] Reads / Writes: 89% / 11% [--] Total buffers: 24.2G global + 92.2M per thread (1200 max threads) [!!] Maximum possible memory usage: 132.2G (139% of installed RAM) [OK] Slow queries: 0% (2K/254M) [OK] Highest usage of available connections: 32% (391/1200) [OK] Key buffer size / total MyISAM indexes: 128.0M/92.0K [OK] Key buffer hit rate: 100.0% (8B cached / 0 reads) [OK] Query cache efficiency: 79.9% (181M cached / 226M selects) [!!] Query cache prunes per day: 1033203 [OK] Sorts requiring temporary tables: 0% (341 temp sorts / 4M sorts) [OK] Temporary tables created on disk: 14% (760K on disk / 5M total) [OK] Thread cache hit rate: 99% (676 created / 5M connections) [OK] Table cache hit rate: 22% (1K open / 8K opened) [OK] Open file limit used: 0% (49/13K) [OK] Table locks acquired immediately: 99% (64M immediate / 64M locks) [OK] InnoDB data size / buffer pool: 6.1G/19.5G -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance Reduce your overall MySQL memory footprint for system stability Increasing the query_cache size over 128M may reduce performance Variables to adjust: *** MySQL's maximum memory usage is dangerously high *** *** Add RAM before increasing MySQL buffer variables *** query_cache_size (> 192M) [see warning above] The server has 76GB ram and dual E5-2650. The load is usually below 2. I appreciate your hints to interpret the recommendation and optimize the database configs.

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• How to Monitor Network in Medium-Sized Company?

  - by Kyle Lowry

  I work at a medium sized company (100+ employees). An issue that has been cropping up is network performance, internet access in particular. We have about 70 or more computers, a mix of Mac OS X and Windows XP & 7 machines. We have several servers (Exchange server, PC file servers, MS SQL, Blackberry, FTP, Mac server, etc). There are four main switches, a SonicWall firewall, and probably a couple routers in the server room with a dozen or so more scattered around the building. The network structure has grown organically over a number of years; and, as far as I know, there really isn't a monitoring solution in place. When we experience network issues (slow connections, dropped packets, and so on), our general solution is to power cycle some hardware or go around to each employee and ask them if they are uploading/downloading any large files. This is really inefficient and time consuming, and it does not allow us to monitor the network, tackling potential problems proactively. I would like to find a solution that would allow me to monitor network usage company-wide in real time, with detail going down to the individual computer, ideally. Given the hodgepodge of equipment and operating systems, what would be the best way to set up some kind of monitoring solution? Hardware, software, restructuring our network architecture?

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• VNC Server that can be used from command line?

  - by jesusiniesta

  I'm looking for a replacement for a custom vnc server that we have been using in my company for a long time. I need a simple executable that can be run from command line by an IT Support software without the user noticing it (our application will warn the user, we don't want him to see we are using that VNC sever). I need it to support Windows and preferably also OSX. The only option I've found is UltraVNC, but I can't configure it from command line to accept loopback connections without authentication. We have already a whole VNC Viewer + VNC Repeater + Bouncers architecture, and the only missing piece is the VNC Server. Do you know any solution you could suggest me? I'm afraid I'll end up developing a new VNC server myself, may be based on an open source one. EDIT: When I said I don't want the user to notice this VNC server, I should have added that I don't want him even noticing the installation. So better if it can be installed silently or can be executed as a portable executalbe (for instance, ultravnc can be installed and ran as a service from command line, or simply executed quietly, with only a notification icon; its problem is that I can't run it without authentication).

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• Xen or KVM? Please help me decide and implement the one which is better

  - by JohnAdams

  I have been doing research for implementing virtualization for a server running 3 guests - two linux based and one windows. After trying my hands on Xenserver, I am impressed with the architecture and wanted to use the opensource XEN, which is when I am hearing a lot more about KVM, about how good it is and it's the future etc. So, could anyone here please help me answer some of my queries, between KVM and XEN. Based on my requirement of three VMs on one server, which is better for performance - KVM or XEN, considering one the linux vm's will works a file-server, one as a mailserver and the third one a Windows server? Is KVM stable? What about upgrades.. What about XEN, I cannot find support for it Ubuntu? Are there any published benchmarks on both Xen and KVM? I cannot seem to find any. If I go with Xen, will it possible to move to KVM later or vice versa? In summary, I am looking for real answers on which one I should use.. Xen or KVM?

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• What are the typical methods used to scale up/out email storage servers?

  - by nareshov

  Hi, What I've tried: I have two email storage architectures. Old and new. Old: courier-imapds on several (18+) 1TB-storage servers. If one of them show signs of running out of disk space, we migrate a few email accounts to another server. the servers don't have replicas. no backups either. New: dovecot2 on a single huge server with 16TB (SATA) storage and a few SSDs we store fresh mails on the SSDs and run a doveadm purge to move mails older than a day to the SATA disks there is an identical server which has a max-15min-old rsync backup from the primary server higher-ups/management wanted to pack in as much storage as possible per server in order to minimise the cost of SSDs per server the rsync'ing is done because GlusterFS wasn't replicating well under that high small/random-IO. scaling out was expected to be done with provisioning another pair of such huge servers on facing disk-crunch issues like in the old architecture, manual moving of email accounts would be done. Concerns/doubts: I'm not convinced with the synchronously-replicated filesystem idea works well for heavy random/small-IO. GlusterFS isn't working for us yet, I'm not sure if there's another filesystem out there for this use case. The idea was to keep identical pairs and use DNS round-robin for email delivery and IMAP/POP3 access. And if one the servers went down for whatever reasons (planned/unplanned), we'd move the IP to the other server in the pair. In filesystems like Lustre, I get the advantage of a single namespace whereby I do not have to worry about manually migrating accounts around and updating MAILHOME paths and other metadata/data. Questions: What are the typical methods used to scale up/out with the traditional software (courier-imapd / dovecot)? Do traditional software that store on a locally mounted filesystem pose a roadblock to scale out with minimal "problems"? Does one have to re-write (parts of) these to work with an object-storage of some sort - such as OpenStack object storage?

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• Reverse web proxy with time constraints

  - by user2893458

  I have a web application which produces several unique URLs of the type http://service.company.com/service.html?type=aaaa&key=jfiZm6u6cW where the last part is a randomly generated key. Each such URL provides access to an instance of the service provided. I am looking for a way to restrict access to those URLs based on time constraints, as an example URL#1 should be available between 8:00AM and 10:00AM on May 30, URL#2 should be available between 10:30AM and 12:00PM on May 31, and so on. I already have a resource scheduling application based on Drupal and would like to find a way to include those URLs as scheduled resources. The web application is deployed on Apache Tomcat, so I don't have the knowledge or the resources to alter it, therefore I thought that I could put some sort of reverse proxy in front of the web app that could implement the time constraint feature. In my thoughts the reverse proxy would allow or disallow access to each URL based on the rules that my scheduling application would provide. There may be other ways to deliver such a solution, but I can't think of anything better, so the question is: is there a reverse web proxy architecture that could allow access to the destination URLs based on time and date rules? Any other ideas are more than welcome.

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• Mercurial confusion - commit / push, backouts

  - by Madmanguruman

  I'm trying to set up a repository on a shared filesystem. I'm using Mercurial 2.1.2 on a Windows-based architecture. I start with an empty folder on the shared filesystem and create a repository in it. After this, I dump in the baseline files, and add them to versioning, then commit the changes. I then clone the repository to my local hard drive. I then make a change in my local repository, commit it, then push back to the shared filesystem repository. The shared repo graph I get in TortoiseHG looks strange (to me). This is the shared repo: This is the local repo: On the shared repo, the working directory always shows up on the top, then the graph goes 'down' to rev. 0 then back 'up' again through various revisions. It looks to me like I have two different branches, even though everything is on the default branch. Also, that 'top' revision always says "* Working Directory * Not a head revision!" I noticed that in my local repository, I don't get that dangling working directory at the top of the list - everything is in one branch. I also noticed that on my local repository, I can back out the tip revision with no problem. On the shared filesystem repository, I cannot, since I get an error ("Cannot backout change on a different branch"). How can this be? Aren't they supposed to be identical to each other? Am I fundamentally doing something wrong?

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• Server 2012 - transparent SMB failover without shared discs, possible?

  - by TomTom

  here is the scenario - there is a small set (200gb around) of data that I HAVE to keep available. Those are basically shared VHD images that serve as master images for a lot of our VM's - they then run in differential discs off those. The whole set is "mostly read only". In more detail: A file that IS there and IS used will NEVER change. I may delete files (when absolutely not in use) and add new files, but a file that is there once gets read protection set and that it is until it is retired. Obviously, I need as much uptime as possible. SO FAR we run that by having this directory local on every Hyper-V server. Now I think moving this into our storage fabric. Due to the "it HAS to be there" I pretty much want a share nothing architecture. DFS would be perfect for this - a file never changes, so replication would work nicely. Folders could be replicated to a number of servers, all would reference them from there. Now, that hyper-V supports SMB that could be a good idea to isolate these on a number of servers - we try to move into a scenario where the storage is more centralized. Server 2012 supports always on shares, but it seems that this only works with a clustered disc behind. Is there any way around this for read only file stores? All documentation points to stuff like a shared JBOD - but that would leave me open for file system corruption. I really plan to go quite separately here, vertically - 2 servers, both with SSD only for this, both with their own 2000W separate USV, both with enough bandwidth to handle everything thrown at them (note to everyone tinking this is 10G - this would be SLOW and EXPENSIVE compared to a nice Infiniband backbone). The real crux is that this is an edge case obviously - as the files are read only once in use.

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• Nexenta, NFS and LOCK_EX

  - by Givre

  I'm currently using an LAMP architecture and I expect a big problem :( I have several http web server using PHP5. All are mounting via NFS (v3) the directory for all the hosted websites. The file server is running the Nexenta Storage Appliance using ZFS . The problem is all the NFS client trying to write something in a file over the NFS get this problem : This is inside the apache2 process: open("/nfs/website1/file.txt", ORDWR|OCREAT, 0600) = 11647 fstat(11647, {stmode=SIFREG|0600, st_size=23754, ...}) = 0 flock(11647, LOCK_EX And the process never get the LOCK and keep waiting for... always. The effect? All the apache2 procces get used and waiting.. my severs can't still proccess the others requests because there is no more proccess available. I don't now where to find a solution.. for me it.'s on the NFS server side.. but wich configuration is wrong or missing ? How can I find what is wrong? If you need more information about the configuration, just ask me what can help you more :)

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• Alias for Drupal "Sites" folder with Apache on Windows Server 2008

  - by sgtbeano

  I'm having to move a number of sites from a LAMP stack to a WAMP one, provided by Zend, and I've hit a problem. Our architecture is a number of loadbalanced web servers which have their own local webapp drives which are kept in sync with one server performing as the master copy. There is then a separate DFS share provided to all web servers from our pillar san. Usually a Drupal install under our LAMP cluster would have the main Drupal web app in a local HTDOCS mount for each server and the SITES directory within Drupal would then be symlinked out to the DFS or NFS share so that there is a common FILES and TMP directory. The problem I'm having is that there seems to be no equivalent of symlinks on Win Server 2008, shortcuts have a .ink at the end making Apache see them as a distinct file. So I've tried using an alias call in the vhost file like this; <Location /drupal-626/sites> Order deny, allow Allow from all </Location> Alias /drupal-626/sites "Z:\Path to alternate sites directory" The root for this test is; http://main-domain-url/drupal-626/ Unfortunately this isn't work so I'm wondering if any of you have a solution which would work? Many thanks for taking the time to read this.

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• What is the typical maximum number of database connections for Oracle running on Windows server ?

  - by Sake

  We are maintaining a database server that serve a large number of clients. Each client typically running serveral client-applications. The total number of connections to the database server (Oracle 9i) is reaching 800 connections on peak load. The windows 2003 server is starting to run out of memory. We are now planning to move to 64bit Windows in order to gain higher memory capability. As a developer I suggest moving to multi-tier architecture with conneciton pooling, which I believe is a natural solution to this problem. However, in order to support my idea, I want the information on: what exactly is the typical number of connections allowed for Oracle database ? What is the problem when the number connections is too high ? Too much memory comsumption ? or too many sockets opened ? or too many context switching between threads ? To be a little bit specific, how could Oracle Forms application scale to thousand of users without facing this problem ? Shall Oracle RAC applied to this case ? I'm sure the answer to this question should depend on quite a number of factors, like the exact spec of the hardware being used. I'm expecting a rough estimation or some experience from the real world.

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• visually documenting web server configuration and infrastructure

  - by Alex Ciarlillo

  I have just finished a large re-organization and update of our institutions web server(s). This server hosts 3 virtual hosts, 3-4 blogs, 2 wikis, some legacy static HTML pages, and many hosted documents (PDF, .jpg, .xls). I have organized the site into a structure of something like: /var/www/sites/vhost1, vhost2, vhost3 .../wordpress/blogX .../mediawiki/wikiX Data is in a seperate directory structure so I can run a cron task over it to make sure it is all writeable and such. I then symlink to these data directories for each application. /var/www/data/vhost1, vhost2, vhost3 .../wordpress/blogX/uploads .../mediawiki/wikiX/images All Apache configs are in /etc/httpd/conf.d/vhosts.d/vhost1,2,3.conf On top of this there is also a testing server which mirrors this setup. Once changes are fully tested, they are rsynced down to the live server. All the wordpress installs and mediawiki installs are straight form SVN and updates are done by switching branches or "svn up". So my question is how can I best document to share with a) co-workers, b) possible future replacement, c) myself 6 months from now. Obviously I can make a wiki page, excel document, whatever and fill it with text, but I am looking for a more visual representation that I can use to explain the architecture to less-technical people. Ideally it would be awesome if this visual representation could then be expanded to get more technical details.

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• Windows XP Freezes

  - by Jim Fell

  Hello. I'm running a machine with Windows XP Professional 64-bit. Every so often, it will freeze for no apparent reason. That is, everything stops responding, except the mouse. I can move the mouse around, but I can't click on anything. Keyboard input is also not accepted/received when this problem occurs. The three-finger salute fails to bring up the Task Manager. Even pressing the power button on my computer fails to shut it down. The only way out of this that I have found is to hard-reboot the machine (i.e. pull power or hold power button in for 10 seconds). This problem was occurring on the system when it had all its updates and after a fresh install when not everthing was quite yet updated. I've run the Scandisk utility and the latest version Memtest86 that supports 64-bit architecture; neither found any errors. The last time this happened was on a fresh install of Windows. Only Nero Essentials, Avast antivirus (disabled), Firefox, and Spybot were installed. I was not running Nero, Firefox, or Spybot at the time, and Avast was disabled, so I'm pretty certain this is a Windows issue. Is anybody familiar with this problem or have any pointers? Thanks.

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• PHP Web Server Solution (Apache/IIS)

  - by njk

  I apologize if this is too broad or belongs on Super User (please vote to move if it does). I'm in the process of creating requirements for an internal PHP web server to submit to our architecture team and would like to get some insight whether to use a Windows or *nix platform and what applications would be required. The server will host a small PHP application that will be connecting to SQL Server. The application will need to send mail. We would also like to incorporate a FTP server to allow files to be dropped in. From what I've read regarding a Windows platform using IIS, it seems as though IIS would only be advantageous if using a .NET or ASP application. Does IIS have mail functionality? Or how is mail traditionally configured (esp. on *nix)? Also, does IIS have directory configuration functionality like Apache does with .htaccess? For a Windows based solution; IIS (comes with FTP) Apache (has mod_ftp module) For a *nix based solution; Apache

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• Apache not routing to tomcat on correct Virtual host

  - by ttheobald

  We are looking at moving from Websphere to Tomcat. I'm trying to send traffic to tomcat from apache web server based on the virtual host directives in apache web server. After some playing around I have it sort of working, but I'm noticing that if I have a JKMount directive in the first VirtualHost in apache, all virtualHosts will send to the application server. If I have the JKMount in Virtual hosts further down in the configs, then only that VirtualHost works with the request. For Example, with the configs below here are my symptoms mysite.com/Webapp1/ -- I resolve to the proper application mysite2.com/Webapp1/ -- I resolve to the proper application (bad!) mysite.com/MonitorApp/ -- I resolve to the proper application mysite2.com/MonitorApp/ -- I resolve to the proper application (bad!) mysite.com/Webapp2/ -- I DO NOT get to the app (good) mysite2.com/Webapp2/ -- I resolve to the proper application Here's what my web server virtualhosts look like. <VirtualHost 255.255.255.1:80> ServerName mysite.com ServerAlias aliasmysite.ca ##all our rewrite rules JkMount /Webapp1/* LoadBalanceWorker JKmount /MonitorApp/* LoadBalanceWorker </VirtualHost> <VirtualHost 255.255.255.2:80> ServerName mysite2.com ServerAlias aliasmysite2.ca ##all our rewrite rules JkMount /Webapp2/* LoadBalanceWorker </VirtualHost> we are running apache webserver 2.2.10 and tomcat 7.0.29 on Solaris10 I've posted an image of our architecture here. http://imgur.com/IFaA6Rh I HAVE not defined VirtualHosts on Tomcat. Based on what I've read, my understanding is that it's only needed if I'm accessing Tomcat directly. Any assistance is appreciated. Edit Here's my worker.properties. worker.list= LoadBalanceWorker,App1,App2 worker.intApp1.port=8009 worker.intApp1.host=10.15.8.8 worker.intApp1.type=ajp13 worker.intApp1.lbfactor=1 worker.intApp1.socket_timeout=30 worker.intApp1.socket_connect_timeout=5000 worker.intApp1.fail_on_status=302,500,503 worker.intApp1.recover_time=30 worker.intApp2.port=8009 worker.intApp2.host=10.15.8.9 worker.intApp2.type=ajp13 worker.intApp2.lbfactor=1 worker.intApp2.socket_timeout=30 worker.intApp2.socket_connect_timeout=5000 worker.intApp2.fail_on_status=302,500,503 worker.intApp2.recover_time=30 worker.LoadBalanceWorker.type=lb worker.LoadBalanceWorker.balanced_workers=intApp1,intApp2 worker.LoadBalanceWorker.sticky_session=1

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• Specific issue on data pump API in oracle

  - by Median Hilal

  I have a client/server architecture. Using an Oracle dbms on the database server side. I need to perform a user-triggered (from client side) backup of the database, where the best way to perform that is using a stored procedure on the server side which the client may call, as the client has no oracle tools to perform the backup. I've searched thorough inside available solutions and have found that using a stored procedure is the best way. Well, then I found that using oracle data pump API is the best way to use inside a PL/SQl stored procedure. My specific questions about the API are... I would like to ask about two issues ... ---- The first ----- the detach function to detach the handler, is it necessary to be used at the end of the procedure? and what if I don't use it? I read the Oracle documentation but I didn't get their point, they say it doesn't terminate the job but indicates that the user is not interested in it, an when I use detach at the end of my procedure the exported .dmp file disappears. ---- The second ----- to perform a user (client side) triggered back up as the modification are only to the data, I used TABLE parameter for the export operation. But the version parameter... what should it be? I also read the documentation but couldn't determine what I need (LATEST or COMPATIBLE) ? Thanks

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