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  • RabbitMQ and persistence (blocking writes?)

    - by daharon
    I want to create a RabbitMQ server on a virtual machine (VMware) to be used in production. It will contain persistent queues. I'm wondering if it is a bad idea to store the server on a NAS that's accessed over NFS. Basically my questions are: Will RabbitMQ's writes be blocking? Will the entire queue's operation halt on a write? How much performance degradation should I expect when persisting over NFS?

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  • Help: Setup Outgoing Mail Server Only for Multiple Domains Using Postfix?

    - by user57697
    I want an outgoing mail server ONLY for multiple domains. I plan to use Postfix as that seems to be the easiest to setup being very new to Ubuntu/Linux. The setup I plan to have are as follows: I want to use virtual domain with postfix i.e. my multiple websites must be able to send an email from each their respective domains i.e. [email protected] is sent from my domain1.com website and [email protected] is sent from domain2.com website This is an outgoing mail server only i.e. I don't want any returned (or otherwise) email sent to my postfix server. Incoming mail is handled by Google Apps/Gmail and is already setup. I already set my SPF recording to designate my mx records and postfix server ip as valid email servers i.e. "v=spf1 mx include:mydomain.com -all" How can I achieve this? I'm frankly a little confused, so some help would be appreciated. I attempted to follow these guides here, but it doesn't seem right (and it isn't clear what all the settings mean): How to configure Postfix virtual domains http://www.sysdesign.ca/guides/postfix_virtual.html Postfix Installation *.slicehost.com/2008/7/29/postfix-installation Basic Postfix settings (main.cf) *.slicehost.com/2008/7/31/postfix-basic-settings-in-main-cf I can only post one link, but those articles above can be found by replacing * with articles in the hyperlink.

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  • MacBook Pro - Aquamacs - spell check

    - by peggy Li
    I have tried to use spell check for aquamac. I highlighted a region of the text. Then clicked Edit, then spell check region. I got the error message: Error : No word lists can be found for the language "en_US". Then I went to the website to download the following dictionaries: CocoAspell : I just clicked the download button. It was reported that the download was successful. However, when I tested it and highlighted a text region and clicked spell check. The same error message came out. Do I need to pull the downloaded .pkg to a certain place, such as the application folder, before I opened the .pkg? Or what else do I need to do make it work? I also downloaded the base package Aspell (for Intel) and the pre-built dictionaries as (as the instruction of the website), just the same way as point 1. I still got the same error message. Again, Do I need to pull the downloaded .pkg to a certain place, such as the application folder, before I opened the .pkg? Or what else do I need to do make it work? I would be greatly appreciated if someone could give me some help? Peggy Li

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  • Can an SATA hard drive image be restored onto an SSD?

    - by Bryan Parker
    I'm currently using an SATA hard drive on my primary dev machine, but planning to upgrade to an SSD at some point soon. I use TrueImage on a regular basis to make backups, and to upgrade my harddrive without reinstalling everything. Will I be able to restore and boot onto an SSD? Will there be a performance hit or other issues to watch out for?

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  • compile Passenger statically into Apache httpd?

    - by Oleg
    I prefer to disable httpd dynamic module loading on my production server. I've been using mod_jk linked statically into httpd for quite a long time and it proved to be stable. Now I would like to add Ruby Passenger (mod_rails/mod_rack) to my httpd. I wonder if it is possible to link it statically into Apache httpd the same way too? (without producing a huge httpd) If it is, are there any potential pitfalls, safety or performance concerns having both mod_jk and mod_rails within the same executable? Thanks

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  • Java applet class never found

    - by Andrew
    I am having a problem with the java plugins of all three major browsers: chromium, firefox and Internet Explorer. The issue is that applets will always fail to load and yield errors no matter what website or what applet I am trying to use. I can not see any of the example applets on oracle's website; I can not launch the minecraft browser applet; nor can I launch any applet across the web using any browser. I always receive a "class not found:AppletClassHere.class" error. I know that my browser plugin must be working correctly because I can launch the Cisco Nac applet each time I connect to my network and I can launch my own simple applets offline. I am connecting to the internet through a vpn in case that is important. It also seems like a lot of other people I know are having this issue. Re-installing the plugin does not appear to fix the issue. I am asking this question to find out the cause of this problem, and any possible solutions. Thank you.

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  • Setting up DNS using VirtualMin/WebMin

    - by Nyxynyx
    I am moving from a cPanel server to one where I've installed VirtualMin. The LAMP stack and the website files have been setup properly and I can access the website by its IP address. Problem: Now its time to point my domain mydomain.com to my new server. After reading many sites describing setting up bind and master zones, I am pretty confused as to what to do, especially coming from a cPanel server where its really simple to set this up. Attempt Tried to register my nameservers ns1.mydomain.com and ns2.mydomain.com at my domain registrar, but I am missing the IPs I need to point these nameservers to. Should I set ns1.mydomain.com to the IP addres of my web server, and not register ns2.mydomain.com? When specifying the DNS for mydomain.com, the first one I've set it to ns1.apadment.com. On the manager/admin page of my webhost provider, I am given the option to create a secondary slave DNS, which I assigned to the IP address of my server. Though I am not sure how the slave DNS will copy the info from my web server? I have assigned this secondary DNS ns.hostprovider.com as the second DNS for mydomain.com I tried creating a Virtual Server under Virtualmin, but it seems to mess up Apache's DocumentRoot for the site by creating and enabling a new vhost file that ends with .conf. I edited the .conf file to point DocumentRoot back to where its supposed to be /var/www/mydomain instead of /user/mydomain.com I believe the next step is to setup the zone. Virtualmin has already created a Master Zone with 8 different addresses (www.mydomain.com, ftp.mydomain.com...). Under Nameservers, there are already 2 records. One is the hostname (random name given by hostprovider, ns12345.ip123-123.net), the other is the secondary slave DNS provided by the host provider. Does having BIND running on my web server makes the server the master DNS? Thank you!

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  • Webserver optimization

    - by f-aminov
    Hi guys! I have a website hosted on a VPS (512Mb - minimum guranteed memory, 510Mhz proccessor, Debian 5.0 Lenny, Apache 2.2.9 with nginx 0.7.65 as a frontend to serve static content, MySQL 5.1.44, PHP 5.3.2 with APC caching). I'm a web developer, so I'm not very good at optimizing servers, but I've managed to install and setup all those neccessary components (LAMP, nginx, etc.). After that I decided to stress test my website (which uses Drupal 6.16 with caching and all possible optimization enabled) using a utility called "Webserver Stress Tool 7". And it seems to me that the results aren't any good - here is a graph (sorry, as a new user I'm not allowed to post images) As you can see the response time depending on amount of simultaneous users increases very quickly. With 10 simultaneous users the time is about 1000ms, with 100 simultaneous users it's about 15000ms (15s!). The question is do you think this is normal behavior for such a server or something is wrong with the settings and optimization? If you think something is wrong what particulary could be wrong? Any other suggestion how to speed this a little bit up?

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  • Application to test a cluster/grid

    - by Mystic
    Is anyone aware of any application (computation + data) that I can download to test an in-house grid middleware that will run on a local cluster. I hope to compare the performance with other available grid systems.

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  • Reporting Services 2008: Virtual directories not visible in IIS7..

    - by Ryan Barrett
    I'm having some problems with Reporting Services on Windows Server 2008 Standard. I've installed server 2008 as a standalone webserver (with roles/features of an web application server). On top of that, I've installed Sql Server 2008 Standard with Reporting Services (and the rest of the BI tools). Problem is, I want to modify the rights on the virtual directories. However, the virtual directories aren't appearing in IIS 7 management tool. I can connect to reporting services, albeit only with the local windows admin account. I can download Report Builder fine from an session on the server (but not from any clients). I've tried removing the default website from IIS, and that stops the reporting services website from working. The machine (a VM) isn't for production use - it's used on a closed network internally for testing and development purposes. I need to be able to let my fellow developers login without a password, and they must be able to install ReportBuilder 2.0. Must not be linked to a domain or active directory in any form. Google isn't much help, the results suggest I modify the virtual directory Does anyone have any suggestions?

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  • Websites down EC2 inaccessible via SSH CPU utilisation 100% last few hours - what should I do?

    - by fuzzybee
    I have multiple websites hosted on 1 single EC2 instance. 1 website "abc" were down for a few hours, sometimes threw database connection error and sometimes just took too long to respond. 1 website "def" were incredibly slow but still up and running the rest of the websites had the same symptoms has "abc" I can afford 15 min or less down time for "def". Should I then (in AWS console) reboot my instance or create an AMI image from my instance and launch it and associate my elastic IP to the new instance or "launch more like this" Background on what may have happened to my ec2 The last time I made changes for 21 hours ago. A cronjob to create snapshots ran around 19 hours ago and it has been running for a long time. Google Analytics shows traffic to my websites such as kidlander.sg has been nothing exceptional. Is there any other actions I should take or better options I could have? (I have already contacted AWS support but their turnaround is 12 hours so I appreciate all the help I could get) Update I got everything back up and running and CPU utilisation back to normal, around 30%. There is 1 difference between "def" and "abc" as well as my other websites "def"'s database is hosted on RDS "abc"'s database is hosted on an EC2 instance (different from my web server instance) configured by myself Nevertheless, I checked the EC2 instance I'm using as MySQL server yesterday and it was absolutely fine during the incident low CPU ultilisation I could log in using linux command line

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  • CPU/Mem/Disk utilization (average) after process has completed

    - by BassKozz
    Ubuntu Server 9.10 So there is the time command which will show you the time it took for a specific process/command to run after the command has completed. For example: :~$ time ls real 0m0.020s user 0m0.000s sys 0m0.000s I'd like to also collect the average CPU usage, Memory, and Disk (i/o) utilization after the process has completed using time (or another command if necessary). How can I accomplish this? Mainly I am using this to benchmark MySQL import performance using different innodb_buffer_pool_size settings.

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  • JBOSS App Server vs. Glassfish

    - by codingbear
    I'm quite newbie on Glassfish. What are some differences between JBoss and Glassfish? Why would you chooose one over the other. I'm trying to read up on Glassfish, but it is really hard to pinpoint things that I may need before I start installing and trying to deploy some applications on it. UPDATE It would be good if any additional information on JBoss and Glassfish comparison is provided (e.g. technologies they support, performance, etc.)

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  • checking the status of CPU throttling: whether ON or OFF

    - by Gaurish Telang
    I am trying to install the ATLAS BLAS library which recommends that I turn if CPU throttling to do the install. How do I check if my CPU throttling is ON or OFF? I tried the suggestion of Code: ./cpufreq-selector -g performance in the /usr/bin directory as suggested elsewhere in the forum but there was no output and the control returned back to the user. I have searched everywhere but there does not seem to be a way to determine the status of the CPU throttling

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  • Apache + Tomcat error 120006 Using mod_proxy_ajp for Load Balance

    - by Wakaru44
    I have an apache 2 frontend with two nodes, and a backend with two instances of tomcat 6 balance with mod_proxy_ajp. The bbdd is in a separate machine. All machines use RHEL, 6.2 on the frontend, 5.5 on the backend. The infraestructure is virtualized using VMware. # This is the apache config in one of the virtualHost. ProxyPreserveHost On ProxyPass / balancer://liferay/ <Proxy balancer://liferay> BalancerMember ajp://lrab:8009 route=liferaya BalancerMember ajp://lrbb:8009 route=liferayb status=+H ProxySet lbmethod=byrequests nofailover=on </Proxy> The conector in tomcat is now configured like this: <!-- Define an AJP 1.3 Connector on port 8009 --> <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" URIEncoding="UTF-8" enableLookups="false" allowTrace="true" /> Do you think it could be useful to set a maxThreads parameter, like in this post?? in that case, How can i determine a proper number of threads? From time to time, we get errors like this [Tue Sep 18 17:57:02 2012] [error] ajp_read_header: ajp_ilink_receive failed [Tue Sep 18 17:57:02 2012] [error] (120006)APR does not understand this error code: proxy: read response failed from 192.168.1.104:8009 (lrab) And apache switches to the pasive node (if its active) or fails with 503. Some things i have tried so far: I think that i have some performance issues with one of the applications, Here you can see a threadDump But i'm not quite sure about it. I also started to monitor the network connection. I have noticed that there are some pings lost when i have a "ping -f " so maybe it could be a network issue, but the success rate is 100% (so the lost packets are only a few among the flood, but maybe, i don't know, enough to break the link betwen apache and tomcat). I wrote a python script to check connectivity with timestamps on the pings, so i can know when the network fails. After sniffing the network , i can also see some RST packets, but i don't know if that is a normal behaviour (some applications do that to end a network communication). I have also noticed that the applications have problems communicating with the database, but im not even sure if this could be related or not. If you think so, i can post more info about it. I changed the connector on the tomcats to use the native one, but still the same. I need not even a solution to this, but maybe some guidance on how can i troubleshoot this better ¿Analyze threads, monitor mysql performance, sniff the traffic between apaches and tomcats? Ultimately, all i need is to balance the tomcat instances in Active/pasive mode, so if there is another way to do it, i could give it a try.

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  • IP address from a MAC address

    - by acermate433s
    I'm writing a class to integrate a POS card reader device to our software. In order for it to work I must know what IP it's using. We were given some sample code by the service provider and the way they do this is they open a website (http://www.ebizchargeemv.com/getip.php?mac={MAC address of device}) and it would return the IP address of the device. The device I'm using is a POSLynx220 Mini. It has an ethernet port that connects to the internet to communicate with the service provider. I send TCP data to it and the device then controls a PIN pad that prompts a client to swipe his card. It's probably a mini computer that communicates with the service provider and uses the PIN pad as its input device. Just being curious but how did they implement this? Are they implementing it using ARP? I'm planning on not using their website to determine the IP of the device. I've seen some code that uses ARP but using executing ARP in one of the PC didn't detect the POS device.

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  • NTFS on the mac - worth paying for?

    - by Console
    I currently use ntfs-3g on my mac to be able to write to NTFS-formatted drives. I have seen two commercial alternatives that boast better performance and more advanced features - Tuxera (a commercial version of ntfs-3g it seems) and Paragon. Are these products really better? Any experiences, hard facts, benchmarks from real-world use?

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  • Optimal setup for ASUS P6X58D Premium BIOS (no OC)?

    - by rumtscho
    Normally, I'd trust the mainboard manufacturer to choose the best options as defaults. But I had trouble with the board, because even with Quick Boot enabled, it booted twice as slowly as a Pentium 4 Celeron. Then I changed lots of options at once (most of them weren't explained in the manual, just mentioned with a single sentence) and the boot time is only marginally worse than the Pentium 4 (54 sec against 46 sec from button to pw entering screen). Now I don't know if I have turned something off which should have stayed on. I guess I even won't be able to boot from a CD now, because even though it is present in the boot sequence, I took off a timeout I think it needs to check whether there is a disk in the drive. The second reason is that I don't have an internal HDD, only a SSD. I forgot my sources blush but I am under the impression that today's BIOS and OS options are geared toward booting from a HDD, which is often less than optimal when one boots from a SSD, especially when there are functions which cause avoidable writing cycles, as a SSD wears out after too many writing cycles. Most of the things I've read concern the OS, but there are some BIOS-relevant options too. I am especially confused about the disk mode. The board supports AHCI, IDE-simulation and RAID, but of the different articles I've read, there is a proponent for each and no clear arguments for any. So can one tell me which options are important in general and which are important for a SSD-only system? I don't want to overclock the CPU, so you don't have to say anything about this (yes I know the board is meant for OC:)). I am thinking of overclocking the RAM, since they sold me 1600er heatsinked modules which are running at 1066 now, but I'm not sure yet about that. The rest of the system: i7-930, Intel X25-m G2, 6 GB RAM, GTS 250, some no-name Blue-ray ROM. 2 external HDDs over USB 2.0. Lots of other USB-connected hardware (12 devices I think), no SATA 3 drives (will disabling the controller have an impact on performance?), no LAN, only WiFi. Lucid Lynx 64 bit, no dual boot, no virtual installations. The main uses of the system are: managing and playing/showing all the media stored on the external disks, lots of image manipulation, some video editing, a bit of (non-demanding) gaming, rarely development. Lots of Internet surfing too, but this shouldn't have much impact on performance.

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  • (Serving PHP) Does Apache2 will create new thread on every connection?

    - by apasajja
    Based on many online sources, in serving static files, Apache2 will create new thread on every different connection... results in resource hungry But how about serving PHP through Apache2 (mod_php, MPM worker, etc)? Does apache will also open new thread like serving static files? (AFAIK, in nginx php-fpm, we can set the max thread, but I dont know how many connection per thread) I'm planning to use Apache2 in serving PHP, and hope it will be same as nginx PHP-FPM or even better in resource usage and performance.

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  • Outlook 2007, how to stop replies from being sent if they meet criteria

    - by CChriss
    I have my college's email account auto-forwarded (they don't offer pop3 or imap) to my main gmail account so I don't have to go to their website to check for mail. That gmail account, and others, use pop3 down to my Outlook 2007. In my Outlook, I have a rule that puts mail sent to my @college address into a folder named Collegemail. Since the college email system lacks pop3 or imap, I have to go to their site to send a reply, so that the reply will be sent from my @college email address. The problem is that I cannot seem to get into the habit of going to my college's website to reply to those emails, so quite often I reply to them while in Outlook, which means my replies are sent "from" my main gmail address. How can I set up Outlook to either 1) disable replying to emails in the Collegemail folder or to emails where my college email address is in the original To: line, or else 2) set it to send those replies from a non-functional dummy account. The dummy account would be unable to send the email so the email would be stuck in the Outbox. (I already have the non-functional dummy account set up as Outlook's "Default" account. When I compose a new mail I have to deliberately pick one of my good accounts to send the new mail with, or else Outlook uses the default dummy account and the email stays in the Outbox with a Send error.) Thanks. Update: Anybody? Please help.

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  • How to copy a bunch of pages? Is there a 3rd party tool?

    - by unknown (yahoo)
    (I asked the following question at the DNN forum, and also at snowcovered. Nobody knew of such an obvious time-saver being for sale. I'm posting here in case anybody knows of a freeware module that might do this.) By "groups of dnn pages", I mean pages that form a hierarchy (not necessary a hierarchy that is headed with a page at the same level as the Home page.) I know that I can copy web pages, one by one, using the admin login via the web-based dnn interface. But, I'd prefer a script or wizard, of some sort (that runs scripts behind the scenes) that can allow me to 1) specify a web page that I want to copy (along with the hierarchy of pages under it) 2) specify the names and titles of the new top-level pages 3) specify whether the contained modules of the top-level page that I want to copy is to be : ( ) New ( ) Copy ( ) Reference (as in the web-based interface) 4) repeat 3) for each of the source pages in the hierarchy that I want to copy You might say that I am looking to do something similar to creating a portal web site based on a template, except that it's not an entirely new website - instead it's a section of the current web site. I might want to do this because I have an organization which is broken into chapters, and I want each chapter to have, say, it's own General Information page (which acts like it's home page), and underneath that, in it's hierarchy, a Contact Info page and an Events page. so: Home Page   General Information Page     Contact Info     Events -- Home Page   General Information Page     Contact Info     Events   General Information Page Kiwanis - Bloomfield     Contact Info     Events   General Information Page Kiwanis - Dayton     Contact Info     Events If I have 200 chapters, I certainly don't want to copy those 3 web pages using the web based interface, as that would take a long time. (And imagine if each chapter's new sub-website had 30 pages!) I just want to specify the parameters of a copy process, then press a button, and let the system do the rest.

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  • Linux Mplayer Instead of flash any distro/browser

    - by data_jepp
    The thing is that flash sucks for linux on 64-bit, performance vice. Due to this I actually download every clip to a temp folder and play the file while it's being downloaded with mplayer. This works really nice. Flash is not to play a video. Does there exist a plugin for this for any browser? I tried google, but I can't find the right words to search for.

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