Apr 28 4 comments
English, Software

Tracker eating my memory cache

UPDATE I removed tracker, when I rebooted my machine again my memory cache got ~1000M again, and again, and again.

I didn’t knew it existed until recently, that I saw all my memory was eaten up and suddenly I was using my SWAP instead of my memory, and it was fully loaded.

What’s my surprise? I have 2G in memory and 1113M of it was cache, and 1G of swap full as well. The worst thing is that I reboot my machine and without starting anything I get 903M of cache full, out of nowhere!

I start to track what’s the issue, where’s the leak, and found that if I killed tracker-store early then my memory stopped being loaded of cache.

There’s a bug, already reported, it’s #612242 and the workaround given is to nuke the database with tracker-control -r.

It worked. Now my cache is not full, but since I just did it I don’t know if in some days my tracker-cache will be full again and eating all my memory.

Just wanted people know there was a work-around at least and you could use your computer again.

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Feb 16 0 comments
English, Software, Tecnología

Node.js’s Stitch + NginX: don’t use the trailing slash on proxy_pass

This is a remainder for me of what failed. While using stitch module for Node.js together with NginX as proxy-reverse for my application I got 404 while trying to get /application.js, except anything else being generated at run-time.

The reason was the trailing slash in proxy_pass variable. So, instead of

proxy_pass http://127.0.0.1:88334/;

You should use

proxy_pass http://127.0.0.1:88334;

That fixed my issue, didn’t had time to do further investigation, but that’s a workaround for that issue.

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Feb 11 0 comments
English, Software, Tecnología

Express Sessions with connect-redis + Socket.IO in CoffeeScript

If you are working with Socket.IO and Express Framework while developing your applications you must know they work together so Socket.IO will listen on the same port that your HTTP/S server and will serve the requests by that way, but Socket.IO doesn’t works on the same paradigm where you pass a middleware to the route and you could get authentication on this manner. Instead, you must configure Socket.IO with a global authorization method or a handshake authorization manner.

Since in my applications I serve cookies already where I save session info and this is already stored in Redis with help of the module connect-redis then I should be able to get this info onto Socket.IO authorization method and with this allow only to authorized users to get info from my websockets.

I found how to do it with the default session-store in-memory from Express, and adapted that so it could work with Redis.

Here’s the snippet:

Hope anyone can found it useful!

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Nov 05 4 comments
English, Software, Tecnología

Polipo and uncachable file

Dear lazyweb,

I was searching through the internet what was I doing wrong, I wrote to the polipo-user list but my email got stuck on moderation, and my connection is really shitty (that’s why I’m using polipo the way I’m using it). I have relaxTransparency and mindlesslyCacheVary set to true, but I don’t need so aggresive caching in my development stages that are located under *.local and another development subdomain on the net.

Already tried setting uncachableFile to /etc/polipo/uncachable and to ~/.polipo-uncachable, according to the web-config thing is properly setted up, but can’t get it to recognize it’s content. I first thought it was I was writing bad the regex, .*\.local but it does work in the /etc/polipo/forbidden file. Besides, adding complete domains to the uncachable file doesn’t works neither. Could someone confirm this or throw me a hand on this? I’m using 1.0.4.1-1.1 version which is the last one on unstable repos.

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Oct 26 1 comments
English, Software, Tecnología

and issues on vim with $TERM=”screen”

Because of tmux I run with $TERM=”screen” instead of my regular rxvt-unicode, but I had a big issue with VIM because of this, it kept writing and F\n and H\n each time I pressed and keys respectively. I finally found the way to solve this, making VIM use $TERM=”xterm” internally writing this on my ~/.vimrc:
if &term == "screen"
set term=xterm
endif

So, this way, even in my servers without XTerm installed (but ncurses-term) I can use VIM as I’m used to.

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Oct 02 12 comments
English, Software, Tecnología

Moving from Screen to Tmux

I’ve been a long-time user of GNU Screen, as almost every person I know that spend a lot of time in a terminal.

I must admit I was happy, I really was. I was used to my workflow with 4 terminals 8×25 and a bunch of screens, with several nested-screens. I used awesome-wm before, so definitely I felt I wasn’t using all the space in my laptop screen (my laptop is a ThinkPad X61, so 1024×768 in a 12 inches-screen) but that was OK, after all my workflow was, well, good.

Until 2 days ago, I was told to try tmux, in fact, I was told «and why are you using screen? use tmux». As a daily-user of Screen my first reaction was «I’m used to», «I can use it as I want», and a lot of excuses for just not trying something new. But then I made a little research (on Google, of course). In about 30 minutes I ended up with a multiplexer working as I wanted and as I never got Screen to work. Finally I was using just a terminal and using all the space available in my tiny-laptop-screen and plus: saving a lot of bandwidth with my permanent SSH connection (a really big plus now that I’m living with a capped link to the net with a GSM-modem).

I changed the Ctrl-b shortcut to Ctrl-a (b is too far for using it with only one hand), configured so I could use nested tmux’es like screen when I push Ctrl-a a, activated visual monitoring and even got to use the tmux’s buffer along with my X11 buffer when I press Ctrl-a >!!

It’s all in my ~/.tmux.conf, use it at will. Later I will make a screencast about using tmux, so more people can get a working tmux easily.

ATM, I’m even more happy than I was with GNU Screen, so, any other recommendation, people?

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Sep 13 0 comments
English, Software

Changing background sync’d with jQueryUI Tabs

I love to use jQuery UI plugins. The one I use constantly is Tabs and this time I needed to sync the auto-changing of tab with the background. For this I used an event called tabsshow to trigger my function + the code I wrote yesterday for full-page background with CSS:

/* @author Jose Luis Rivas
*
* @desc swaping full-background pages with jQuery UI's Tabs plugin events.
*/

$(document).ready(function() {

$( "#slides" ).bind( "tabsshow", function(event, ui) {
var tabattr = $('.ui-state-active').find('a').attr('href');

switch(tabattr) {
case '#tab1':
$('img#bg').attr('src', '/img/tab1.jpg');
break;

case '#tab2':
$('img#bg').attr('src', '/img/tab2.jpg');
break;

default:
$('img#bg').attr('src', '/img/tab1.jpg');
break;
}

});

});

What it does the script?

Finds the active-tab identified with the .ui-state-active class and then changes the img tab src attribute according to the href attribute of the active-tab.

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Sep 12 1 comments
English, Software

Full-Page Background with CSS with crossbrowser support

I’ve been trying to get the perfect full-page background without using JavaScript since a while. I tried with CSS3 but, obviously for IE <9 was a pain in the ass, even for older Firefox' releases. So I decided to go with the plain-CSS option:





Content



img#bg {
min-width: 100%;
min-height: 100%;

/* Proportionate re-dimension */
width: 100%;
height: auto;

position: fixed; top: 0; left: 0;

z-index: -1;
}

What does it does?

It takes an inline image and uses it as if were a background-image thanks to the z-index: -1 CSS-rule.

There are lots of other techniques at CSS-Tricks but none works in every browser as this one in particular.

Enjoy.

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Sep 08 0 comments
English, Software, Tecnología

Moved from approx to apt-cacher-ng

I have been a long-time user of approx, I got used to it and knew how to configure it so all my machines + VMs used the same cache and saved me a lot of bandwidth.

But that was when I got a stable connection at >100KiB/s in a daily-basis. Now I’m with a mobile connection at <30KiB/s and sometimes is intermittent, so approx started giving me a lot of headaches.

When approx tries to connect a host that can't be resolved its domain name, then gets 404. How does that reflects in the /pool? Well, you get a file touch'd and 0 bytes size. When you try again, approx will find the same file with 0 bytes size and will gives you again a 404, even if you can now resolve the name address of that domain. And as I like to use what I know, then I made a workaround: Each time this happened I ran:

# find /var/cache/approx -size 0 | xargs rm

So next time I requested a file to approx it tried to connect to the host. But I got tired.

I installed apt-cacher-ng, tweaked a bit /etc/apt-cacher-ng/acng.conf so it uses port 9999 and the cache dir redirects to the same cache than approx and done. apt-cacher-ng returns 503 when it can't connect to the peer, even tries to several repositories with only a line in /etc/apt/sources.list in my clients. It makes me happy and keeps saving me a lot more of bandwidth than approx.

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Aug 30 2 comments
Español, Software, Tecnología

Deck.js: Para hacer presentaciones con HTML+JS

Hoy navegando me topé con esta librería Javascript para hacer lo que llaman presentaciones modernas con HTML. Depende de jQuery y Modernizr para hacer la magia y está bajo una licencia dual MIT/GPL. Funciona en IE7+, Opera, Chrome, Firefox y Safari.

La librería en cuestión se llama Deck.js y pueden ver una demostración de sus resultados, incluye más temas y documentación para que tú mismo crees tus temas si manejas CSS+JS.

Pueden hacer un fork del código de Deck.js desde GitHub.

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