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  • understanding an API

    - by adusum
    I know that there are many API's like json,Facebook,twitter etc for developing related applications on iphone....but how to understand an API?This might be scilly question but I want to know how? what would you suggest for for a beginner?

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  • Utilizing back and forward browser buttons for web apps

    - by at
    How do I use the back and forward browser buttons to navigate my javascript/jQuery web application? I know I can do window.location.href = 'this_url#placeholder' and then perform the appropriate action. But when I do that, the browser scrolls to the element with that placeholder id (or to the top if there wasn't one). How do I get the browser to not scroll anywhere? I've seen this on other sites like facebook, what's the appropriate mechanism for this?

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  • Using unixODBC to connect to Oracle server

    - by Paul
    I am trying to configure our web server (RHEL 5.4 x86) to connect to an Oracle database using unixODBC. I have installed unixODBC-2.2.11-7.1.1, which yum tells me is the latest version. I have also installed the Oracle InstantClient 11.2 and the Oracle InstantClient ODBC library. I have symlinked the all the .so files in /usr/lib/oracle/11.2/client/lib to /usr/lib. I have set $LD_LIBRARY_PATH to /usr/lib/, $ORACLE_HOME to /usr/lib/oracle and $TNS_ADMIN to the directory containing my (valid) Tnsnames.ora file. Here are the contents of my /etc/odbcinst.ini file: [Oracle] Description = Oracle ODBC Connection Driver = /usr/lib/libsqora.so.11.1 Setup = FileUsage = and my /etc/odbc.ini file: [Oracle] Application Attributes = T Attributes = W BatchAutocommitMode = IfAllSuccessful CloseCursor = F DisableDPM = F DisableMTS = T Driver = Oracle EXECSchemaOpt = EXECSyntax = T Failover = T FailoverDelay = 10 FailoverRetryCount = 10 FetchBufferSize = 64000 ForceWCHAR = F Lobs = T Longs = T MetadataIdDefault = F QueryTimeout = T ResultSets = T ServerName = //<host>:<port>/<db> SQLGetData extensions = F Translation DLL = Translation Option = 0 UserID = (ServerName has been edited...host, port, and db are actually there, and correct) When I run isql I get $ isql -v Oracle isql: symbol lookup error: /usr/lib/libsqora.so.11.1: undefined symbol: SQLGetPrivateProfileStringW And running dltest gives me $ dltest Oracle SQLConnect [dltest] ERROR dlopen: Oracle: cannot open shared object file: No such file or directory If anyone has any insights I would be grateful, I've been trying to get this to connect for about 5 hours now... I am going home for the night, but will gladly provide more details, if necessary, tomorrow morning, to anyone willing to help...

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  • Speedstep and Intel x5570?

    - by sajal
    Hi, My new server has 2 x X5570 CPUs. Now here is the output of grep -i hz /proc/cpuinfo model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz cpu MHz : 1600.231 It always remains the same.. no matter how much load is mysql or any other app hogging. Even when mysql eats 2 or 3 CPUs at 100% each, the output of cpuinfo is the same. If fact mysql performance for some heavy inserts is poorer than my old E5430 server. Any clues? I contacted the server provider, they tried turning off SpeedStep and still we see the same results. Any insights would be helpful cause I am paying heavily for this box and would love to milk all juice i can.

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  • FFMPEG Install on EC2 - Amazon Linux

    - by Oliver Holmberg
    Hello Serverfault friends, I am about two days into attempting to install FFMPEG with dependencies on an AWS EC2 instance running the Amazon Linux AMI. I've installed FFMPEG on Ubuntu and Fedora systems with no problems in the past, and have read reportedly successful instructions on installing on Red Hat/Fedora. I have followed a number of tutorials and forum articles to do so, but have had no luck yet. As far as I can tell, the main problems are as followed: The amazon linux (Most similar to red-hat/centos) yum repositories don't have ffmpeg available. I have found instructions to update the repositories to include the required packages, but adding these repositories cause yum to fail in updating packages. (Also, I've read some cautionary tales about adding redhat/centos repositories to amazon linux that lead me to believe it may be a bad idea) (https://forums.aws.amazon.com/thread.jspa?messageID=229166) I have tried a more complicated method of downloading the source tarball, compiling, and installing, but this always fails due to missing dependencies and other errors. On to my question: Has anyone successfully installed FFMPEG on Amazon Linux? Is there a fundamental incompatibility? If anyone could share specific instructions on installing ffmpeg on amazon linux I would be greatly appreciative. Any other insights/experiences would also be appreciated. Thanks in advance, Oliver

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  • High load average, low CPU and IO (Centos 5.7)

    - by Ben
    A Drupal 7 site with CiviCRM, after running smoothly for a year on a 1&1 VPS suddenly became unresponsive. Now pages eventually load, but can take more than a minute. Looking at resource use in Virtuozzo, the load average carries a warning, and has remained above 1. While I understand this isn't particularly high, this is a change from when the site was working. Here is a typical snapshot of top: top - 03:10:32 up 3:21, 1 user, load average: 1.16, 1.22, 1.30 Tasks: 43 total, 1 running, 42 sleeping, 0 stopped, 0 zombie Cpu(s): 0.1%us, 0.1%sy, 0.1%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 2097152k total, 1015112k used, 1082040k free, 0k buffers Swap: 0k total, 0k used, 0k free, 0k cached CPU idle level never seems to go much below 70%. wa is virtually always at 0. There appears to be lots of free memory. And here is some vmstat output, again showign wa at 0, plenty of free memory, and an idle CPU: procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 2 0 0 1100872 0 0 0 0 2783 23672 0 538 1 0 99 0 0 1 0 0 1100872 0 0 0 0 0 16 0 101754 0 0 100 0 0 0 0 0 1100872 0 0 0 0 0 17 0 103133 0 0 100 0 0 0 0 0 1100872 0 0 0 0 0 1 0 102080 0 0 100 0 0 1 0 0 1100872 0 0 0 0 0 6 0 99881 0 0 100 0 0 0 0 0 1100872 0 0 0 0 0 1 0 105187 0 0 100 0 0 I've spoken to 1&1 but they don't have any ideas as to what could be causing the high load average. Instead they suggested an upgrade :) I've looked for processes that might be causing this, examined MySQL showprocesslist, and restarted the container with no result. Does anyone have more troubleshooting suggestions or insights?

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  • How do you add a domain name to a VPS?

    - by jasonaburton
    Hi all, I have a VPS with allgamer.net (I use it to play minecraft). I also have a domain name with networksolutions.com What I want to do is attach that domain name to the VPS. I want to run a wiki on my domain name. If this is possible I can avoid buying another hosting plan just for the wiki. How do I go about doing this? I have very little knowledge in server administration so any advice you guys have is greatly appreciated! I'm pretty sure I have to change the DNS in my domain name to the DNS for my VPS, but on allgamer.net's interface there is no discernable place to find out what I need to change it to. Is there a way to find out the DNS via SSH on my VPS? As well, when I first got my VPS with allgamer.net I filled out a form for it with all my information, but they also wanted a domain name along with it. I gave them the domain name I currently own, but for some reason, it's like it's not connected to the VPS, like if I go to mydomain.com there's nothing, as well, if I use mydomain.com for my minecraft server, it also doesn't work. It's as if it's serving no purpose by being "attached" to my VPS. Any insights into this? Thanks for any help you guys can give me.

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  • Advice on networking career

    - by fmysky
    Hello! I need some insights on a networking career. I have a valid CCNA and few months of experience as a Jr. network analyst. My focus is a type of job where I can administer networking/storage hardware and possibly managing servers/workstations too. I am new to this job area, specifically new to city like LA. I am currently unemployed and so, my question is: should I continue with my cisco certifications(routing/wireless) or other comptia certs or both to get a reliable job? I am really interested in CCNA wireless but watching craigslist(LA) and other job sites, it seems people need more cisco voice people. While, some others also ask for Net+ certs. I have scarce financial sources so, its better to make some good decisions. I have not been applying yet due to some personal problems but I will soon. Thank you! P.S. I don't know if I can ask questions like this here. Sorry about that.

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  • Extract tar with multiple tars inside?

    - by Andrew Fashion
    Is there a way to untar a file with multiple tars inside? It's suppose to just untar everything inside including untarring the tars inside the tar... With windows it does it, quite annoying I can't figure it out on linux... Here is what I am doing: # tar -xvf socialengine4.0.5p1.tar core-base-4.0.5.tar core-install-4.0.7.tar external-autocompleter-4.0.0.tar external-calendar-4.0.1.tar external-chootools-4.0.3.tar external-fancyupload-4.0.1.tar external-firebug-4.0.0.tar external-flowplayer-4.0.0.tar external-moocomet-4.0.0.tar external-moocrop-4.0.0.tar external-moolasso-4.0.0.tar external-mootools-4.0.2.tar external-mootree-4.0.0.tar external-open-flash-chart-4.0.0.tar external-smoothbox-4.0.0.tar external-swfobject-4.0.0.tar external-tagger-4.0.2.tar external-tinymce-4.0.2.tar library-engine-4.0.5.tar library-facebook-4.0.0.tar library-ofc-4.0.0.tar library-pear-4.0.1.tar library-scaffold-4.0.3.tar module-activity-4.0.5p1.tar module-announcement-4.0.3.tar module-authorization-4.0.5.tar module-core-4.0.5.tar module-fields-4.0.5p1.tar module-invite-4.0.3.tar module-messages-4.0.5.tar module-network-4.0.5p1.tar module-storage-4.0.4.tar module-user-4.0.5.tar widget-rss-4.0.2.tar widget-weather-4.0.0.tar changelog.html [root@D18634 se4]# ls -l total 36980 -rw-r--r-- 1 1000 1000 27188 Oct 8 15:39 changelog.html -rw-r--r-- 1 1000 1000 359424 Oct 8 16:13 core-base-4.0.5.tar -rw-r--r-- 1 1000 1000 1122304 Oct 8 16:13 core-install-4.0.7.tar -rw-r--r-- 1 1000 1000 38400 Oct 8 16:13 external-autocompleter-4.0.0.tar -rw-r--r-- 1 1000 1000 100352 Oct 8 16:13 external-calendar-4.0.1.tar -rw-r--r-- 1 1000 1000 31232 Oct 8 16:13 external-chootools-4.0.3.tar -rw-r--r-- 1 1000 1000 66560 Oct 8 16:13 external-fancyupload-4.0.1.tar -rw-r--r-- 1 1000 1000 85504 Oct 8 16:13 external-firebug-4.0.0.tar -rw-r--r-- 1 1000 1000 216576 Oct 8 16:13 external-flowplayer-4.0.0.tar -rw-r--r-- 1 1000 1000 11776 Oct 8 16:13 external-moocomet-4.0.0.tar -rw-r--r-- 1 1000 1000 16384 Oct 8 16:13 external-moocrop-4.0.0.tar -rw-r--r-- 1 1000 1000 27648 Oct 8 16:13 external-moolasso-4.0.0.tar -rw-r--r-- 1 1000 1000 1445376 Oct 8 16:13 external-mootools-4.0.2.tar -rw-r--r-- 1 1000 1000 45568 Oct 8 16:13 external-mootree-4.0.0.tar -rw-r--r-- 1 1000 1000 330240 Oct 8 16:13 external-open-flash-chart-4.0.0.tar -rw-r--r-- 1 1000 1000 43008 Oct 8 16:13 external-smoothbox-4.0.0.tar -rw-r--r-- 1 1000 1000 18432 Oct 8 16:13 external-swfobject-4.0.0.tar -rw-r--r-- 1 1000 1000 19968 Oct 8 16:13 external-tagger-4.0.2.tar -rw-r--r-- 1 1000 1000 5711360 Oct 8 16:13 external-tinymce-4.0.2.tar -rw-r--r-- 1 1000 1000 1230848 Oct 8 16:13 library-engine-4.0.5.tar -rw-r--r-- 1 1000 1000 28672 Oct 8 16:13 library-facebook-4.0.0.tar -rw-r--r-- 1 1000 1000 125952 Oct 8 16:13 library-ofc-4.0.0.tar -rw-r--r-- 1 1000 1000 1715200 Oct 8 16:13 library-pear-4.0.1.tar -rw-r--r-- 1 1000 1000 340480 Oct 8 16:13 library-scaffold-4.0.3.tar -rw-r--r-- 1 1000 1000 354304 Oct 8 16:13 module-activity-4.0.5p1.tar -rw-r--r-- 1 root root 327680 Jan 8 02:37 module-albums-4.0.5.tar -rw-r--r-- 1 1000 1000 80896 Oct 8 16:13 module-announcement-4.0.3.tar -rw-r--r-- 1 1000 1000 147456 Oct 8 16:13 module-authorization-4.0.5.tar -rw-r--r-- 1 1000 1000 2643968 Oct 8 16:13 module-core-4.0.5.tar -rw-r--r-- 1 root root 665600 Jan 8 02:37 module-events-4.0.5.tar -rw-r--r-- 1 1000 1000 377344 Oct 8 16:13 module-fields-4.0.5p1.tar -rw-r--r-- 1 root root 501760 Jan 8 02:37 module-forum-4.0.5p1.tar -rw-r--r-- 1 1000 1000 81408 Oct 8 16:14 module-invite-4.0.3.tar -rw-r--r-- 1 1000 1000 147968 Oct 8 16:14 module-messages-4.0.5.tar -rw-r--r-- 1 1000 1000 111616 Oct 8 16:14 module-network-4.0.5p1.tar -rw-r--r-- 1 1000 1000 99840 Oct 8 16:14 module-storage-4.0.4.tar -rw-r--r-- 1 1000 1000 844288 Oct 8 16:14 module-user-4.0.5.tar -rw-r--r-- 1 root root 18094080 Jan 8 02:40 socialengine4.0.5p1.tar -rw-r--r-- 1 1000 1000 12288 Oct 8 16:14 widget-rss-4.0.2.tar -rw-r--r-- 1 1000 1000 13824 Oct 8 16:14 widget-weather-4.0.0.tar

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  • Is it possible to rate limit based on host headers? i.e. not just on ip address

    - by Blankman
    I have a web service endpoint that I am building where people will post an xml file to, and it will really get pounded with over 1K requests per second. Now they are sending in these xml files via http post, but a good majority of them will be rate limited. The problem is, the rate limiting will be done by the web application by looking up the source_id in the xml, and if it is over x requests per minute, it will not be processed further. I was wondering if I could do rate limit checking earlier in the processing somehow and thus save the 50K file going threw the pipeline to my web servers and eating up resources. Could a load balancer make a call out to verify rate usage somehow? If this is possible, I could maybe put the source_id in a host header so even the XML file doesn't have to be parsed and loaded into memory. Is it possible to just look at host headers and not load up the entire 50K xml file into memory? I really appreciate your insights as this takes more knowledge of the entire tcp/ip stack etc.

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  • can't access SATA card config screen on boot, nor access the disks

    - by Ronald
    We've just upgraded our file server using an ASUS P6T WS Pro board, running FreeBSD-RELEASE 8.2 and using zfs to manage 12 WD20EARS disks. Since our 3ware card has been giving us trouble we started using the six on-board SATA connectors and got a SuperMicro USAS2-L8i to provide eight more ports. Mechanically, the card is an awkward fit but electrically it all seems ok. Upon boot, the LSI controller shows up and states that pressing ctrl-c will bring up the LSI Config Utility. When doing that, the message changes to state that the utility will be started after initialization, however that never happens. There does seem to be an error message that's only displayed too briefly to read and seems to be about PCI and "not enough space". (That message is pushed off by a hardware summary and I've found no way to scroll back at this point.) The disks do not show up in any recognizable ways after booting, either. I found a hint in another discussion to check the address mapping on either the card or the motherboard BIOS, but have found no way to do that. So what I tried on a hunch is to disable everything that's on-board, including network adapters, Firewire controller and SATA. In fact, after doing that, I can successfully launch the LSI Config Utility. As far as I can tell, all looks well in there, and when booting in that configuration it also displays a list of the disks connected to it, which looks just fine as well. Only problem now is that I can't boot that way, because I need the on-board SATA controller and network adapters. As soon as I re-enable any of them I'm back to square one. That discussion I mentioned about mapping addresses said to try D000, then D7FF, then DFFF, in order. The LSI Config Utility shows the card address as D000 but offers no way of changing it. Any tips or insights would be appreciated.

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  • nginx proxy_pass POST 404 errors

    - by Scott
    I have nginx proxying to an app server, with the following configuration: location /app/ { # send to app server without the /app qualifier rewrite /app/(.*)$ /$1 break; proxy_set_header Host $http_host; proxy_pass http://localhost:9001; proxy_redirect http://localhost:9001 http://localhost:9000; } Any request for /app goes to :9001, whereas the default site is hosted on :9000. GET requests work fine. But whenever I submit a POST request to /app/any/post/url it results in a 404 error. Hitting the url directly in the browser via GET /app/any/post/url hits the app server as expected. I found online other people with similar problems and added proxy_set_header Host $http_host; but this hasn't resolved my issue. Any insights are appreciated. Thanks. Full config below: server { listen 9000; ## listen for ipv4; this line is default and implied #listen [::]:80 default_server ipv6only=on; ## listen for ipv6 root /home/scott/src/ph-dox/html; # root ../html; TODO: how to do relative paths? index index.html index.htm; # Make site accessible from http://localhost/ server_name localhost; location / { # First attempt to serve request as file, then # as directory, then fall back to displaying a 404. try_files $uri $uri/ /index.html; # Uncomment to enable naxsi on this location # include /etc/nginx/naxsi.rules } location /app/ { # rewrite here sends to app server without the /app qualifier rewrite /app/(.*)$ /$1 break; proxy_set_header Host $http_host; proxy_pass http://localhost:9001; proxy_redirect http://localhost:9001 http://localhost:9000; } location /doc/ { alias /usr/share/doc/; autoindex on; allow 127.0.0.1; allow ::1; deny all; } }

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  • Networking DOS within Windows 7 XP Mode, with a Windows XP/7 Networked Share

    - by theonlylos
    For awhile now, one of my clients has been stuck with Corel Paradox 4.0 (it used to be the biggest database system in the DOS days, until Microsoft released Access in the early 90's) so for awhile I've managed to keep it on life support on Windows XP for a few years, however since switching to Windows 7 x64, I've had to resort to using XP Mode as the sandbox to keep it up and running. While I am able to run Paradox as usual in XP Mode, I'm having a serious issue where if I try connecting the install to the network share (which is located on the Windows 7 portion of the system), Paradox keeps exiting because it says the serial number is invalid. Now, I know for a fact that this is an issue with the virtual loopback adapter and also having the VM linked to the physical ethernet adapter -- and while I have solved this issue before, most of my fixes have been bandages since after a few weeks the issue pops up again. Long story short, I wanted to ask if there is a permanent way to link a DOS program to a network share address. For example, when I try doing \tsclient\paradox (the Windows 7 Address) I keep getting an error saying I need a valid network address. I've tried mapping that folder to various drive letters such as P:\Paradox -- but for some reason that keeps failing over time. For what it's worth, Paradox uses a .SOM file to store the network settings, however it isn't editable in Notepad but rather it's controlled by a wizard in Paradox. But if that extension rings any bells, I'd welcome any insights.

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  • Inconsistent SMTP Access

    - by Mike Hanson
    I have a mail server setup on Windows Server 2008. All was working fine, until I wanted to map a drive on the server so that I can access files on another machine. Windows prompted me to configure Network Discovery, which I did with the "Home/Office" option rather than "Public". After that, several access points that worked before stopped working, like VNC, SMTP, etc. After reinstalling those packages, things appeared to be working again. Unfortunately, problems have returned with my SMTP server. I can use an web-based SMTP tester, and it connects in 62msec (as expected). However, if I telnet from my machine on the same LAN, it takes more than 20 seconds to connect! When I try to send messages from Outlook, it times out entirely with the message: Sending' reported error (0x80042109) : 'Outlook cannot connect to your outgoing (SMTP) e-mail server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).' I've checked the firewall settings, I've tried configuring it to use port 587 instead of 25, but nothing gets around this problem. Does any have any useful insights? Thanks in advance!

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  • How can I configure Cyrus IMAP to submit a default realm to SASL?

    - by piwi
    I have configured Postfix to work with SASL using plain text, where the former automatically submits a default realm to the latter when requesting authentication. Assuming the domain name is example.com and the user is foo, here is how I configured it on my Debian system so far. In the postfix configuration file /etc/main.cf: smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = $mydomain The SMTP configuration file /etc/postfix/smtpd.conf contains: pwcheck_method: saslauthd mech_list: PLAIN The SASL daemon is configured with the sasldb mechanism in /etc/default/saslauthd: MECHANIMS="sasldb" The SASL database file contains a single user, shown by sasldblistusers2: [email protected]: userPassword The authentication works well without having to provide a realm, as postifx does that for me. However, I cannot find out how to tell the Cyrus IMAP daemon to do the same. I created a user cyrus in my SASL database, which uses the realm of the host domain name, not example.com, for administrative purpose. I used this account to create a mailbox through cyradm for the user foo: cm user.foo IMAP is configured in /etc/imapd.conf this way: allowplaintext: yes sasl_minimum_layer: 0 sasl_pwcheck_method: saslauthd sasl_mech_list: PLAIN servername: mail.example.com If I enable cross-realm authentication (loginrealms: example.com), trying to authenticate using imtest works with these options: imtest -m login -a [email protected] localhost However, I would like to be able to authenticate without having to specify the realm, like this: imtest -m login -a foo localhost I thought that using virtdomains (setting it either to userid or on) and defaultdomain: example.com would do just that, but I cannot get to make it work. I always end up with this error: cyrus/imap[11012]: badlogin: localhost [127.0.0.1] plaintext foo SASL(-13): authentication failure: checkpass failed What I understand is that cyrus-imapd never tries to submit the realm when trying to authenticate the user foo. My question: how can I tell cyrus-imapd to send the domain name as the realm automatically? Thanks for your insights!

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  • Configuring dnsmasq to handle mx records on pfsense 2.0.1

    - by Bob B.
    I know from dnsmasq's man page that it is capable of handling mx records, but I can't seem to find anything in pfsense's web GUI or anywhere online that talks about how to include mx records. I'm running pfsense 2.0.1 on a turnkey hardware appliance. I have root shell access. I would prefer not to move away from using DNS Forwarder/dnsmasq if I can help it. I've searched for a dnsmasq.conf file, but none exists. pfsense handles everything through a centralized xml config file. That file merely designates the dnsmasq section using the tag, then drops immediate into listings for each host override you define. My understanding of pfsense's implementation: In the GUI, you can only define an override using the host, domain, IP and description. In the XML that translates to: <hosts> <host>foo</host> <domain>foo.com</domain> <ip>127.0.0.1</ip> <descr/> </hosts> The above example results in foo.foo.com resolving to 127.0.0.1, for instance. But that's it. No ability to select a record type with which to define things like MX. Anyone had any luck with this? Thank you for any insights you might have.

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  • Need help trying to diagnose Symmetrix SAN performance issues

    - by arcain
    I am helping to benchmark hardware for a new SQL Server instance, and the volume presented to the OS for the data files is carved from a set of spindles on a Symmetrix SAN. The server has yet to have SQL Server installed, so the only activity on the box is our benchmarking. Now, our storage engineers say that this volume and it's resources are dedicated to our new server (I don't have access to see the actual SAN config) however the performance benchmarks are troubling. For example, the numbers look good until suddenly, and randomly, we see in our IO benchmarking tool wait times of 100 seconds, and disk queue lengths of 255 in perfmon. This SAN has an 8 GB cache, plus there are other applications besides ours that use the SAN. I'm wondering if (even though the spindles for our volumes should be dedicated to us) the cache may be getting hammered during the performance testing, or perhaps the spindles our volumes are on aren't really dedicated to us. We're not getting much traction from our storage engineers in helping us track down the problem, so if anybody has experience with diagnosing a problem like this and would like to share insights and troubleshooting methodologies, I'd appreciate it.

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  • how to use ajax with json in ruby on rails

    - by rafik860
    I am implemeting a facebook application in rails using facebooker plugin, therefore it is very important to use this architecture if i want to update multiple DOM in my page. if my code works in a regular rails application it would work in my facebook application. i am trying to use ajax to let the user know that the comment was sent, and update the comments bloc. migration: class CreateComments < ActiveRecord::Migration def self.up create_table :comments do |t| t.string :body t.timestamps end end def self.down drop_table :comments end end controller: class CommentsController < ApplicationController def index @comments=Comment.all end def create @comment=Comment.create(params[:comment]) if request.xhr? @comments=Comment.all render :json=>{:ids_to_update=>[:all_comments,:form_message], :all_comments=>render_to_string(:partial=>"comments" ), :form_message=>"Your comment has been added." } else redirect_to comments_url end end end view: <script> function update_count(str,message_id) { len=str.length; if (len < 200) { $(message_id).innerHTML="<span style='color: green'>"+ (200-len)+" remaining</span>"; } else { $(message_id).innerHTML="<span style='color: red'>"+ "Comment too long. Only 200 characters allowed.</span>"; } } function update_multiple(json) { for( var i=0; i<json["ids_to_update"].length; i++ ) { id=json["ids_to_update"][i]; $(id).innerHTML=json[id]; } } </script> <div id="all_comments" > <%= render :partial=>"comments/comments" %> </div> Talk some trash: <br /> <% remote_form_for Comment.new, :url=>comments_url, :success=>"update_multiple(request)" do |f|%> <%= f.text_area :body, :onchange=>"update_count(this.getValue(),'remaining');" , :onkeyup=>"update_count(this.getValue(),'remaining');" %> <br /> <%= f.submit 'Post'%> <% end %> <p id="remaining" >&nbsp;</p> <p id="form_message" >&nbsp;</p> <br><br> <br> if i try to do alert(json) in the first line of the update_multiple function , i got an [object Object]. if i try to do alert(json["ids_to_update"][0]) in the first line of the update_multiple function , there is no dialog box displayed. however the comment got saved but nothing is updated. it seems like the object sent by rails is nil or cant be parsed by JSON.parse(json). questions: 1.how can javascript and rails know that i am dealing with json objects?deos ROR sent it a object format or a text format?how can it check that the json object has been sent 2.how can i see what is the returned json?do i have to parse it?how? 2.how can i debug this problem? 3.how can i get it to work?

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  • Postgres pgpass windows - not working

    - by Scott
    DB: Postgres 9.0 Client: Windows 7 Server Windows 2008, 64bit I'm trying to connect remotely to a postgres instance for purposes of performing a pg_dump to my local machine. Everything works from my client machine, except that I need to provide a password at the password prompt, and I'd ultimately like to batch this with a script. I've followed the instructions here: http://www.postgresql.org/docs/current/static/libpq-pgpass.html but it's not working. To recap, I've created a file on the client (and tried the server as well): C:/Users/postgres/AppData/postgresql/pgpass.conf, where postgresql is the db user. The file has one line with the following data: *:5432:*postgres:[mypassword] (also tried explicit ip/dbname values, all asterisks, and every combination in between. (I've also tried replacing each '*' with [localhost|myip] and [mydatabasename] respectively. From my client machine, I connect using: pg_dump -h [myip] -U postgres -w [mydbname] [mylocaldumpfile] I'm presuming that I need to provide the '-w' switch in order to ignore password prompt, at which point it should look in the AppData directory on the server. It just comes back with "connection to database failed: fe_sendauth: no password supplied. Any insights are appreciated. As a hack workaround, if there was a way I could tell the windows batch file on my client machine to inject the password at the postgres prompt, that would work as well. Thanks.

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  • Postgres pgpass windows - not working

    - by Scott
    DB: Postgres 9.0 Client: Windows 7 Server Windows 2008, 64bit I'm trying to connect remotely to a postgres instance for purposes of performing a pg_dump to my local machine. Everything works from my client machine, except that I need to provide a password at the password prompt, and I'd ultimately like to batch this with a script. I've followed the instructions here: http://www.postgresql.org/docs/current/static/libpq-pgpass.html but it's not working. To recap, I've created a file on the client (and tried the server as well): C:/Users/postgres/AppData/postgresql/pgpass.conf, where postgresql is the db user. The file has one line with the following data: *:5432:*postgres:[mypassword] (also tried explicit ip/dbname values, all asterisks, and every combination in between. (I've also tried replacing each '*' with [localhost|myip] and [mydatabasename] respectively. From my client machine, I connect using: pg_dump -h [myip] -U postgres -w [mydbname] [mylocaldumpfile] I'm presuming that I need to provide the '-w' switch in order to ignore password prompt, at which point it should look in the AppData directory on the server. It just comes back with "connection to database failed: fe_sendauth: no password supplied. Any insights are appreciated. As a hack workaround, if there was a way I could tell the windows batch file on my client machine to inject the password at the postgres prompt, that would work as well. Thanks.

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