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• Making Google Talk messages appear on all logged in clients.

  - by Ryan Hayes

  We're using Google Talk as our unofficial-official chat client around the office at work. One thing that poses a big problem almost every day is the fact that Google Talk only sends a message to the clients that you last used. Even though you may be logged into GTalk on 3 different machines, if you start talking on one machine, that becomes your "active" machine, and if you go to another machine, you will still only get messages on the last active machine. Is there a way that you can force Google Talk to send messages to ALL logged in clients, regardless of which client you are actively using? That way, you don't miss any messages during the time between when you get up from the active machine and then make the new client "active".

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• How to configure Apache (sites-available vs httpd.conf)

  - by Edan Maor

  Hi, I'm brand new to Apache so this might be a stupid question. I've been trying to follow a few basic tutorials explaining how to get Apache up and running (on ubuntu, running on Amazon). I've mostly come up blank, because all the tutorials told me to configure httpd.conf (to add DocumentRoot, etc.). I've now stumbled across one tutorial that told me to add site configurations to the sites-available directory (under /etc/apache), and then symlink to it from sites-enabled. Configuring this way seems to work. But now I'm confused - how am I supposed to configure Apache? Most tutorials still seem to say that I should be using httpd.conf. Which one should I be using? What's the difference? Why are all the tutorials "wrong" (if they are)? Thanks!

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• Amazon RDS Pros/Cons of Multiple DBs per instance

  - by Joe Flowers

  I run two completely independent websites. I am moving their MySQL databases to Amazon RDS. I'm not going to do Multi A/Z deployment - let's remove that variable from this question. I'm not sure whether to create a single RDS instance with two databases, or two Amazon RDS instances with a single database. Ignore cost for the sake of this question. I will not hit the 1 TB data limit so let's ignore that. However, it is extremely important that crashing one of the websites doesn't impact the other. Based on this document - http://docs.amazonwebservices.com/AmazonRDS/latest/UserGuide/Concepts.DBInstance.html I'm assuming that if I write terrible code that crashes one of the databases in a given RDS instance, it could possibly take down the entire RDS instance (and thus inadvertantly affect the other database). Is that correct? Thanks

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• What do these "Cron Daemon" email errors mean?

  - by Meltemi

  Anyone know what this means? Getting one of these every minute in one user's inbox: From: Cron Daemon <[email protected]> Subject: Cron <joe@mail> /tmp/.d/update >/dev/null 2>&1 To: [email protected] Received: from murder ([unix socket]) by mail.domain.com (Cyrus v2.2.12-OS X 10.3) with LMTPA; Tue, 04 May 2010 10:35:00 -0700 shell-init: could not get current directory: getcwd: cannot access parent directories: Permission denied job-working-directory: could not get current directory: getcwd: cannot access parent directories: Permission denied

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• Why does VIM say there is trailing whitespace on this command?

  - by Jesse Atkinson

  I am trying to write a beautify CSS command in vim that sorts and alphabetizes all of the CSS properties as well as checks to see if there is not a space after the colon and inserts one. Here is my code: nnoremap <leader>S :g#\({\n\)\@<=#.,/}/sort | %s/:\(\S\)/: \1/g<CR> :command! SortCSSBraceContents :g#\({\n\)\@<=#.,/}/sort | %s/:\(\S\)/: \1/g These work independently. However, I am trying to pipe them into one command. On save VIM says: Error detected while processing /var/home/jesse-atkinson/.vimrc: line 196: E488: Trailing characters Any ideas?

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• Display won't come back from power saver mode

  - by tynor

  I wan't sure where exactly to post this question, but this one seemed the most relevant. I have a Dell LCD monitor running off a Dell Inspiron 531 tower with an Nvidia GeForce 8600 GT video card. Just recently, when I turn my computer on, the display immediately enters its "Power Saver" mode, and never wakes up. This problem doesn't occur with other computers, or even with this same computer when I use the integrated graphics. I have no other displays to test the card on. I have also tried replacing the power supply (my original one, which ran that video card for 4 years, was 300w, and I replaced it with 500w). Is there anything else I can try to troubleshoot this issue?

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• Alternatives for heapdumps creation with higher performance than jmap?

  - by Christian

  Hi, I have to create heapdumps, which works nice with jmap. My problem is, that jmap takes very long to create the heapdump file. Especially when the heap is getting bigger ( 1GB) it is taking too long. One situation as example: When the server gets into trouble with the heapspace, I want to restart it automatically and create a heapdump before the restart. This works, but takes too long to write the heapdump. This way the server is down for too long. The heapdump creation takes longer than one hour. I know about -XX:+HeapDumpOnOutOfMemoryError, but most of the time I can find the memory problem before the exception is thrown by the jvm. Is there an alternative to jmap which writes the heapdumps faster? A special solution for the example above would also be appreciated. This question is a mix between programming and system-administration, but I think I'm at the right place here.

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• http proxy caching headers

  - by David Hagan

  I have a service for which I'm about to upgrade the authentication. However, I'm trying to ensure that I make the right decision about where the encryption algorithms occur. I currently have two options: option 1) the authentication module is deployed to the client as a javascript library over https and executes client-side, so that the client can POST back an encrypted string. option 2) the authentication module is kept server-side so that the client need only POST back an unencrypted string. I know that many http proxies cache/log the query-string (and therefore any query parameters), but does anyone know of any http proxies that cache the headers as well? If the headers are being cached, then I'll clearly want to encrypt the password inside the SSL encryption, because to my understanding the headers of an HTTPS request may not always be encrypted (depending on the capabilities of the browser etcetera). Can anyone shed any light on the caching of headers by http proxies? Do you have one that does, or know of one that does?

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• bind9 dns proxy

  - by Zulakis

  We are offering multiple SSL-enabled services in our local network. To avoid certificate-warnings we bought certificates for server.ourdomain.tld and firewall.ourdomain.tld. We now created a zone in our local DNS-server in which we pointed the hosts to the corresponding private-ips. Now, each time another record for ourdomain.tld, like for example www.ourdomain.tld or alike are changed, we need to update it on both our public-dns-server AND the local dns-server. I would like our local bind-dns to serve all the information from our public-dns but serve different information for these 2 hosts. I know I could possibly have our private-ips in our public-dns but I don't want that for security reasons. The internet dns-server is being managed by a third party, while we have full control of the intranet one. Because of this I am looking for a solution which lets the intranet retrieve the records from the internet one.

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• Different keyboard layouts at same time for different devices

  - by Joao Carlos

  I have a MacBook Pro running Snow Leopard, and I am using it as a portable but also desktop computer. In order to acheive this, I bought a VGA adapter and I am using it with an external mouse, keyboard, and monitor. The problem is, the external keyboard layout is different from the one on the macbook. It is set to US qwerty (its a logitech G15), and because of that, most keys behave differently than they should. Question is, how can I set up different layouts at same time for different devices? I want US for external keyboard and PT for the default one.

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• Webstorm/PhpStorm: Select specific font from a Font Family

  - by Himanshu Pokhariya

  WebStorm/PhpStorm: How do I choose a specific font from a font family? (for the editor). Specifically, I have downloaded the Source Code Pro font. It comes with these typefaces: Extra Light, Light, Regular, Semibold, Bold. Now, I want to choose Extra Light/Light. But, when trying to select a font, Webstorm only shows me one font for the entire family. How do I make it use a specific one? If it makes a difference, I am currently using Mac OS X Mountain Lion (but I'd be interested in finding the answer to this for Windows as well)

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• Using Exim and Google Apps email as smarthost

  - by pferrel

  I have a server setup to use exim4 and google apps as my smarthost. But I get errors when the to address is not the one I use to authenticate to google and it seems to drop all return addresses that are not the one it uses to authenitcate. Example: On the contact form of my server a user sets [email protected] as their return address and uses the form to send a message. I get an email sent to the admin's address [email protected] but the return address is also now [email protected] I have no idea of the return address the user set on the form. I get around this by putting a bad email address in the form's default so Exim4 sends an error message to [email protected] with the user's email in the debug info. Clearly I either have it set up wrong or do not understand how smarthosts work (probably both).

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• "sed" regex help: Replacing characters

  - by powerbar

  I want to change characters in a XML file by using sed. The input looks like this: <!-- Input --> <root> <tree foo="abcd" bar="abccdcd" /> <dontTouch foo="asd" bar="abc" /> </root> Now I want to change all c to X in the bar tag of the tree element. <!-- Output --> <root> <tree foo="abcd" bar="abXXdXd" /> <dontTouch foo="asd" bar="abc" /> </root> How is the correct sed command? Please consider, there can be more than one occurence of c (next to each other or not) in one tag... I tried this myself, but it won't change multiple c, and it does append a X :( sed -i 's/\(<tree.*bar=\".*\)c\(.*\"\/>\)/\1X\2/g' Input.xml

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• How to spawn-fcgi multiple fcgi processes ?

  - by Shrinath

  We have nginx installed and would like to spawn-fcgi multiple ".fcgi" files. The programs were written in C. How do we spawn all the files at one go ? Edit This is the scenario : I have 3 different programs to serve. Lets say, I've search results from google, yahoo, bing. I want to show 3 columns which host results of above providers. I have 3 fcgi scripts, one for each provider. How do you suggest I put all 3 into action ?

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• Best practice for assigning private IP ranges?

  - by Tauren

  Is it common practice to use certain private IP address ranges for certain purposes? I'm starting to look into setting up virtualization systems and storage servers. Each system has two NICs, one for public network access, and one for internal management and storage access. Is it common for businesses to use certain ranges for certain purposes? If so, what are these ranges and purposes? Or does everyone do it differently? I just don't want to do it completely differently from what is standard practice in order to simplify things for new hires, etc.

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• rm on a directory with millions of files

  - by BMDan

  Background: physical server, about two years old, 7200-RPM SATA drives connected to a 3Ware RAID card, ext3 FS mounted noatime and data=ordered, not under crazy load, kernel 2.6.18-92.1.22.el5, uptime 545 days. Directory doesn't contain any subdirectories, just millions of small (~100 byte) files, with some larger (a few KB) ones. We have a server that has gone a bit cuckoo over the course of the last few months, but we only noticed it the other day when it started being unable to write to a directory due to it containing too many files. Specifically, it started throwing this error in /var/log/messages: ext3_dx_add_entry: Directory index full! The disk in question has plenty of inodes remaining: Filesystem Inodes IUsed IFree IUse% Mounted on /dev/sda3 60719104 3465660 57253444 6% / So I'm guessing that means we hit the limit of how many entries can be in the directory file itself. No idea how many files that would be, but it can't be more, as you can see, than three million or so. Not that that's good, mind you! But that's part one of my question: exactly what is that upper limit? Is it tunable? Before I get yelled at--I want to tune it down; this enormous directory caused all sorts of issues. Anyway, we tracked down the issue in the code that was generating all of those files, and we've corrected it. Now I'm stuck with deleting the directory. A few options here: rm -rf (dir)I tried this first. I gave up and killed it after it had run for a day and a half without any discernible impact. unlink(2) on the directory: Definitely worth consideration, but the question is whether it'd be faster to delete the files inside the directory via fsck than to delete via unlink(2). That is, one way or another, I've got to mark those inodes as unused. This assumes, of course, that I can tell fsck not to drop entries to the files in /lost+found; otherwise, I've just moved my problem. In addition to all the other concerns, after reading about this a bit more, it turns out I'd probably have to call some internal FS functions, as none of the unlink(2) variants I can find would allow me to just blithely delete a directory with entries in it. Pooh. while [ true ]; do ls -Uf | head -n 10000 | xargs rm -f 2/dev/null; done ) This is actually the shortened version; the real one I'm running, which just adds some progress-reporting and a clean stop when we run out of files to delete, is: export i=0; time ( while [ true ]; do ls -Uf | head -n 3 | grep -qF '.png' || break; ls -Uf | head -n 10000 | xargs rm -f 2/dev/null; export i=$(($i+10000)); echo "$i..."; done ) This seems to be working rather well. As I write this, it's deleted 260,000 files in the past thirty minutes or so. Now, for the questions: As mentioned above, is the per-directory entry limit tunable? Why did it take "real 7m9.561s / user 0m0.001s / sys 0m0.001s" to delete a single file which was the first one in the list returned by "ls -U", and it took perhaps ten minutes to delete the first 10,000 entries with the command in #3, but now it's hauling along quite happily? For that matter, it deleted 260,000 in about thirty minutes, but it's now taken another fifteen minutes to delete 60,000 more. Why the huge swings in speed? Is there a better way to do this sort of thing? Not store millions of files in a directory; I know that's silly, and it wouldn't have happened on my watch. Googling the problem and looking through SF and SO offers a lot of variations on "find" that obviously have the wrong idea; it's not going to be faster than my approach for several self-evident reasons. But does the delete-via-fsck idea have any legs? Or something else entirely? I'm eager to hear out-of-the-box (or inside-the-not-well-known-box) thinking. Thanks for reading the small novel; feel free to ask questions and I'll be sure to respond. I'll also update the question with the final number of files and how long the delete script ran once I have that. Final script output!: 2970000... 2980000... 2990000... 3000000... 3010000... real 253m59.331s user 0m6.061s sys 5m4.019s So, three million files deleted in a bit over four hours.

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• Fixing the position of items in vim's statusline

  - by ldigas

  My statusline looks something like this: set statusline+=%m set statusline+=b%n: " set statusline+=%f set statusline+=%F set statusline+=%R set statusline+=%Y set statusline+=\ set statusline+=[ set statusline+=row\ %l/%L set statusline+=,\ " set statusline+=column\ %c\ (%v) set statusline+=column\ %v\ (%c) set statusline+=] which, on an average day, when there is no clouds, gives something like this: [-]b3:options.txt,RO,HELP [row 6291/7778, column 42 (29)] Now, when I go about splitting windows, and opening different files, some of them modified, some of them not, the things in the statusline start to wiggle back and forth, and it annoys me to no end. I saw in vim's help (:help 'statusline) that one can set a fixed width of some items. How would you go about fixing the above items in a way, that if one item is missing, or no matter of its width, that it doesn't affect the other ones ? (i.e. so I can always look at a known position and know what is there ... not move my eyes left and right searching for the thing I need).

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• Generic socket 940 CPU fan interchangeable with HP part number 411454-001

  - by ConcernedOfTunbridgeWells

  Hi, I'm trying to find a generic CPU fan that will fit the air duct in an XW9300. Note that there are two CPU fan mounting schemes used on this machine. One with two grommets in the motherboard that the CPU fan screws into and one with a plastic collar and base plate. The form factor I'm looking for is the former (see picture below): Two HP part numbers for fans in this form factor are 411454-001 (shown below) and 416055-001. Note that the dimensions are important as the machine has an air duct that fits over the fan. Can anyone tell me the manufacturer and model of an equivalent generic part? Better yet, do you know somewhere (preferrably in the UK) that I can obtain such an item from?

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• What is the best free VPN provider? [closed]

  - by Alexis Hirst

  I am looking for a free VPN provider. Which is the best one?

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• Apache2 alias in virtual host

  - by 0x7c00

  I have multiple virtual host in one server and plan to has some alias setup in one virtualhost. So I add the Alias /foo/ /path/to/foo/ in virtualhost directive,but it has no effect. request of host1/foo/ will return 404. But if I add this to /etc/apache2/mods-available/alias.conf, it works. But the problem is host2 will also share this alias. Is there a way to make the alias work only for host1? B.T.W, I use apache2ctl -l, there's no mod_alias.c listed, weird.

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• 3 or 4 monitors with Nvidia and Ubuntu

  - by Jason

  I saw that you are (were?) running 4 monitors with Ubuntu 8.10 and two Nvidia cards (http://stackoverflow.com/questions/27113/how-to-use-3-monitors). I was curious if you were doing this with Xinerama, a hacked up TwinView config, or multiple X screens, or some other method? Does it work with compiz? I intend to run my Dell 30" in the middle with two 1280x1024 on the sides and continue to use one X screen, and run compiz, on Ubuntu 9.04. Currently, I am using 2 monitors with twinview and compiz, which runs fantastic. I just can't get the third monitor running (unless I enable it in its own X screen, and then enable Xinerama to enable windows to be dragged as if all one X screen, but this breaks compiz, and I don't care much for having separate X screen). I am very interested in knowing how you set up 4 monitors with 2 GPU's. Thanks!

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• IT Audit checklist

  - by PHLiGHT

  I recently have taken on the position of a one man show for a company that is going to have an audit. The network isn't anywhere close to prepared and I have been looking for a general audit checklist since one hasn't been provided by the auditors and haven't found much good information out there. Does anyone have a nice template that will give me a good starting point. I know that this will be highly customized to the company but a starting point will be helpful to outline to management just how much work is needed. Thanks,

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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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• Stop VLC player from saving effects & filter settings

  - by bocamax

  VLC Player v1.1.11 Windows 7 Ultimate VLC player launches each new video with setting I used once to brighten a dark video. On a second computer, VLC player opens all videos rotated 270 which was a feature I used once. I now have to manually uncheck Image adjust on one computer & uncheck Transform on another for each video to have it play without these custom settings. I've custom mapped VLC Hotkeys that I use extensively. As a result, I do not want to "reset preferences" and lose my Hotkey mapping. VLC Tools Settings Video Effects Basic Image Adjust (Brightness, Contrast, etc.) VLC Tools Settings Video Effects Basic Transform (Rotate 90, 180, 270) Is there a setting I'm not finding to stop VLC from applying a one time adjustment to all videos?

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• Random flickering on 2.6.32 kernels after suspend

  - by whitequark

  I have XUbuntu 9.10 installed on a Toshiba NB200 netbook with Intel video card that's handled with i915 driver. With 2.6.31 stable, recommended kernel everything but WiFi works fine: Atheros ath9k WiFi shows too small signal power and loses packets in 'bursts' sometimes. With 2.6.32-* (I tested -9 to -11 from Ubuntu's kernel unstable ppa) everything works fine just prior to first suspend: echo mem >/sys/power/state. After it random unidentified fullscreen 'one-frame' flickering begins in Xorg, and after a couple of minutes everything eventually hangs while showing filled grey (not white; it is like default button colour) screen; no X keys are working: Ctrl+Alt+Fn don't, blind typing in console too. Magic SysRq still works and I was able to reboot. Also there is one out-of-tree kernel module called omnibook that is required to turn on WiFi and Bluetooth. Any advices?

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