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• How is time calculation performed by a computer?

  - by Jorge Mendoza

  I need to add a certain feature to a module in a given project regarding time calculation. For this specific case I'm using Java and reading through the documentation of the Date class I found out the time is calculated in milliseconds starting from January 1, 1970, 00:00:00 GMT. I think it's safe to assume there is a similar "starting date" in other languages so I guess the specific implementation in Java doesn't matter. How is the time calculation performed by the computer? How does it know exactly how many milliseconds have passed from that given "starting date and time" to the current date and time?

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• How can I tell if I am out of inotify watches?

  - by Jorge Castro

  I use an application that consumes inotify watches. I've already set fs.inotify.max_user_watches=32768 in /etc/sysctl.conf but last night the application stopped indexing unless I ran it manually, which leads me to suspect I am out of watches. Since I don't know what the trade off is when I increase this number (does it consume more RAM?), I don't know if I should just increase this number, so I'd like to know if there's a way I can tell if it's using all these watches and what the tradeoffs might be for increasing it.

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• Problems to boot on Natty with Kernel 2.6.39.1

  - by Jorge Pinho

  I've installed this new Kernel version (2.6.39.1) and it seems to me that isn't stable. When i boot my laptop it blocks.... and it shows a Fail on Graphics... What is the problem? I've installed proprietary drivers FGLRX. My Laptop is a Acer Aspire 5542G AMD64 bits ATI Radeon HD4570 4gb Memory I'll wait for an answer, please... Here it is my proprietary graphics: This installation problem shows me this:

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• Proper way to measure the scalability of web Application

  - by Jorge

  Let's say that I have a web Application where i'm going to have 300 users and each one have to see data on real time, imagine that each client make an ajax call to the server to see in real time what's happens with the changes of the data, this calls are made each 300 ms per user. I know that i can run a simulation to see if the hardware of my server supports this example. But what happen's if the number of users start to grow up. Is there a way that i can measure the hardware needed to handle this growing behavior, a software, a formula, algorithm or maybe recommend me if i need to implement an distributed application with multiplies servers and balance the loads.

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• How can I remove packages using preseed?

  - by Jorge Castro

  I'm setting up an automated "no questions asked" preseed system and using Dustin Kirkland's server preseed as an example. He uses the following line to install three packages as part of the automated install: d-i pkgsel/include string byobu vim openssh-server I am looking for the inverse of this, basically be able to remove packages as part of the automated install. I've checked the Installation Guide I've checked this example preseed, but it's not clear if this is the canonical list of every single option available. I am thinking I need to to use d-i preseed/late_command string apt-remove packagename to clean up stuff I don't want when the install is done, but I am not sure

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• Looking for a customizable "Did you know..." dialog application

  - by Jorge Suárez de Lis

  I want to deploy a "Did you know..." or "Tip of the day" application at the office. It should: Show a dialog at login time with a random tip. Obviously, provide some way to store my own tips. Be easy to disable and reenable by the user itself. I'm using puppet, so I'm covered with the deployment. The tips don't even need to be gathered from a server, since I can deploy the newest tips file/database with no costs. Sure, I could hack a quick solution by using zenity and bash, but I'd like to know if there's any application out there specifically targeted at this. I don't like the zenity approach very much because it's very limited on the contents that can be displayed. No text alongside screenshots, for example. Zenity is aimed towards displaying simple dialogs.

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• How can I manage multiple administrators with juju?

  - by Jorge Castro

  I manage some deployments with juju. However I am not an island, I have coworkers who also want to manage shared environments. I know I can use the following stanza in ~/.juju/environments.yaml to give people access to my juju environment: authorized-keys: [and then put their ssh IDs in here] What other best practices are available to manage multiple environments with multiple system administrators?

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• can't connect to t

  - by Jorge Jimenez

  I installed, today 10/05/12, for the first time. I've used Windows for several years. Well, it's not as user friendly as some people claim. I decided to give it a try but it's very upsetting that everything seems to be OK with my wireless connection, I'm connected, and I just can not connect to the internet. When I open Firefox I get the message "Server not found". Help please! I never had this problems with Windows.

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• What kind of permission is this? (Groups+Roles)

  - by Jorge

  I'm starting to need an access control for roles in my app. I don't know much of this, but I understand how vBulletin works: I create groups, then give permissions to groups. I think that what I need is the Role Bases Access Control (RBAC) , but i'm not sure, because I need groups to give permissions instead of single users (Maybe it's not that complicated to achieve). Example of what I'm thinking: Given a post: Editor's Group has permission to view it before it's published. Editor's Group has permission to edit its content. Public Group (Default) has not permission to view it before it's published. Admin Group has permission to delete the post. So basically I wan't orientation about if RBAC is what I need. And also, how would it be good to store group membership in a user, for example, would be good to have: ID NAME PASSWORD GROUPS (1, MyName, MyPassword, 1/2/3/4/5) and explode it via PHP or one registry for every Group membership in a table named permissions, example: USERID, USERGROUP values (1, 1), (1, 2) Maybe should be the second way because of the formal norms but I didn't study yet Databases 1 at college.

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• ATI ES1000 graphic card

  - by Jorge Biurrun

  I am installing Ubuntu 12.04 on an IBM x3250 M2 server, It has an ATI ES1000 with no acceleration (that does not bother me, we don't need it), we use it to connect remotely via FreeNX. FreeNX works fine, (except than in Windows 7 machines NX Client shows only icons and no text ?!) but the only resolution I can get in the monitor directly attached to the server is 800x600. The display manager also shows me two monitors!, the real one and one IBM 15". Which driver should I install?. It seems that the ATI driver that comes with Ubuntu does not work properly. Any help will be apreciated. Thanks in advance. j&b

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• Ubuntu 12.10 hasa no wireless connectivity on Dell Inspiron 1520

  - by Jorge Tijerina

  I have just installed Ubuntu for the first time ever. I have just installed it in a Dell Inspiron 1520 that came pre installed with Windows Vista and i currently run both of the OS (I just choose when the computer starts up). The wifi definitely works on the computer since i used it to download Ubuntu in the first place when I was using Vista. The Network Manager says that I only have a 'Wired' Network and it doesn't have any other options to choose from. I connected the Laptop into a wired connection and downloaded the 'Wicd Network Manager' but it had no effect either. From there I continued to go into 'Software Sources' and installed the wireless drive but that had no effect either. So... What can I do?

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• Can't boot up computer windows 8 installation

  - by danny ramirez

  I wanted to install Windows 8 with a volume partition and when the Windows 8 was installing it rebooted and it gave me an error: The digital signature for this file couldn't be verified. File :windows \system 32\winload.exe error code 0xc0000428. I have tried bootec commands and they didn't seem to fix it. Also my Windows 7 got deleted and I only have to boot with the Windows 8 error, so I can't do anything not even boot to safe mode. I have tried to install Windows 8 from disk later on and it won't let me because it keeps rebooting and starting the installation again, so I took off the disk before it rebooted and it takes me to that error again. Remember that's my only boot option so I'm stuck in the installation disk.

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• Eee PC Seashell series netbook screen is cut off at bottom no matter the resolution

  - by Yzmir Ramirez

  I have an Eee PC 1015PE Seashell netbook running Windows 7 Home Premium with an Intel Graphics Media Accelerator 3150 (8.14.10.2230) with a "Generic Non-PnP Monitor" detected. I tried: Changing the resolution (Control Panel = Appearance and Personalization = Display = Screen Resolution) to 1024x768 Updating the video driver (to 8.14.10.2230) Uninstalling the driver and rebooting Pressing the Windows Key + "-" (magnifier) Pressing Ctrl + Mouse Scroll only resizes the desktop items Pressing Fn + F4 shows 1024x600 (which I think is what I should be using, but nothing happens) EDIT: Changed from Landscape to Portrait and it works Attached an External Monitor and when I extend or set as desktop it works only on the External Monitor (shows up as "Generic PnP Monitor in Device Manager) Basically the bottom inch of my desktop is off-screen hiding my start bar, but my wigets are in their proper position (the start bar is not hidden). Pressing Ctrl + Esc shows the start menu but its cut-off. I'm pretty sure I should be using 1024x600 resolution, any advice? What's odd is that this only started happening recently. EDIT2: Here are some screenshots showing the problem: Resized Window to fit: Opened Start Menu - notice it cut off: Maximized window and then scrolled down - notice no Start Menu: I downgraded my graphic driver I downloaded from the Intel Download Center for the Graphic Media Accelerator 3150 (now: 8.14.10.1972) and now my "Generic non-PnP Montior" detects as "Digital Flat Panel (1024x768 60Hz)".

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• Multiple webs on a server using capistrano

  - by Richard Ibarra Ramírez

  Is there any way to configure Capistrano for deploying many webs on a server? I would like to have a project on port 80 an other project on port 1000 and manage each one with different dbs.

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• JPA getSingleResult() or null

  - by Eugene Ramirez

  Hi. I have an insertOrUpdate method which inserts an Entity when it doesn't exist or update it if it does. To enable this, I have to findByIdAndForeignKey, if it returned null insert if not then update. The problem is how do I check if it exists? So I tried getSingleResult. But it throws an exception if the public Profile findByUserNameAndPropertyName(String userName, String propertyName) { String namedQuery = Profile.class.getSimpleName() + ".findByUserNameAndPropertyName"; Query query = entityManager.createNamedQuery(namedQuery); query.setParameter("name", userName); query.setParameter("propName", propertyName); Object result = query.getSingleResult(); if(result==null)return null; return (Profile)result; } but "getSingleResult" throws an exception. Thanks

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• Best approach to show big amount of "grid" data

  - by Jorge Ramírez

  Hello all. I am building an application for Android (1.5) that, after quering a webservice, shows to the user a big amount of data that should be displayed in a "grid" or "table" style. I must show a result of about 7 columns and 50 rows (for example a customer list with names, adresses, telephone number, sales amount last year and so). Obviously, the 7 columns will not fix in the screen and I would like the user would be able to scroll up/down and LEFT/RIGHT (important because of the number of columns) to explore the grid results. cell selection level is NOT necessary, as much I would need row selection level. What is the best approach to get this interface element? Listview / GridView / TableLayout? Thanks

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• how to access anti aliasing method of a font with CSS

  - by Daniel Ramirez-Escudero

  I've had this problem in a lot of different webs. You have a font which has different anti-aliasing options, the designer uses the same font with different anti-aliasing options on different parts of the text on the web. So there is a difference between some elements. In this case I have sharp, crisp, strong and smooth. I've used a font generator to get the code to access it via @font-face. Even so, I also have the original .otf if important to know. Is there a method to access this? I upload a picture of what I mean and my actual code: ![@font-face { font-family: 'light'; src: url('../_fnt/light/gothamrnd-light.eot'); src: url('../_fnt/light/gothamrnd-light.eot?#iefix') format('embedded-opentype'), url('../_fnt/light/gothamrnd-light.woff') format('woff'), url('../_fnt/light/gothamrnd-light.ttf') format('truetype'), url('../_fnt/light/gothamrnd-light.svg#../_fnt/light/gothamrnd-light') format('svg'); font-weight: normal; font-style: normal; }]![enter image description here][1]

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• How would you implement the "tell don't ask" principle in HAML?

  - by Enrique Ramírez Vélez

  Here's the thing. I have a button that, depending on the scenario, will behave, look and have different text. Here's how it, roughly, looks like at the moment: - if params[:param_A] && @statement_A %span.button.cancel_button{attribute: "value_B"} - if @statement_B = t('locale_A') - else = t('locale_B') - elsif params[:param_A] %span.button.cancel_button{attribute: "value_A"} - if @statement_B = t('locale_A') - else = t('locale_B') There's also a CSS class both buttons should have IF statement_B is true. So it is a mess. And I recently read about the "Tell, don't ask" principle which I liked very much, so I'd love to apply it here... but I'm not sure how. I know I could make a helper, but I'd like to stay away from them because reasons (I really have some valid reasons to do so, but those are beyond the scope of this question). I can resort to that as a last resource, but would rather find another solution.

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• Define a Policykit action for Upstart

  - by gentakojima

  I'm trying to get some user to start, stop and reload services by using the udev Upstart interface. I'm using Ubuntu 10.04. I created the file /usr/share/polkit-1/actions/com.ubuntu.Upstart0_6.Job.policy <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE policyconfig PUBLIC "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN" "http://www.freedesktop.org/standards/PolicyKit/1.0/policyconfig.dtd"> <policyconfig> <vendor>UXITIC</vendor> <vendor_url>http://citius.usc.es/</vendor_url> <icon_name>gdm</icon_name> <action id="com.ubuntu.Upstart0_6.Job.Stop"> <_description>Stops a service</_description> <_message>Privileges are required to stop a service.</_message> <defaults> <allow_inactive>no</allow_inactive> <allow_active>auth_admin_keep</allow_active> </defaults> </action> </policyconfig> And also the corresponding authority file /etc/polkit-1/localauthority/50-local.d/10-allow-users-to-start-and-stop-services.pkla [Stop services] Identity=unix-user:jorge Action=com.ubuntu.Upstart_0.6.Job.Stop ResultAny=no ResultInactive=no ResultActive=auth_self But when I try to stop a service, I get Access Denied :( jorge$ dbus-send --print-reply --system --dest=com.ubuntu.Upstart /com/ubuntu/Upstart/jobs/ssh com.ubuntu.Upstart0_6.Job.Stop array:string:'' boolean:true Error org.freedesktop.DBus.Error.AccessDenied: Rejected send message, 1 matched rules; type="method_call", sender=":1.452" (uid=1021 pid=28234 comm="dbus-send) interface="com.ubuntu.Upstart0_6.Job" member="Stop" error name="(unset)" requested_reply=0 destination="com.ubuntu.Upstart" (uid=0 pid=1 comm="/sbin/init"))

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• Subversion and Quickbooks Files

  - by Jorge Fernandez

  I currently have a large problem on one of the file servers I manage for an Accounting Firm. Quickbooks has a tendency to create multiple files of the same thing over and over to prevent data loss. This is a good thing when you handle just a few files. But at an accounting firm it becomes a problem. Some of the older clients have 5-10 files in their respective folders, each with a different cut off date. Because of user error some of these file aren't labeled properly with their correct cutoff dates. This is where Subversion came to mind. Using the revision system would allow for 1 file to be master and have all of its revisions. Has anyone ever tried this with Quickbooks files? I've only used SVN with code for applications making each file size much smaller. How does SVN stand up with larger files like 10-25MB? I'm not exactly sure how SVN handles revisions - does it keep a duplicate of the files and duplicates the disk space space needed?

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• Apache gives empty reply

  - by Jorge Bernal

  It happens randomly, and only on moodle installations. Apache don't add a line in the logs when this happens, and I don't know where to look. koke@escher:~/Code/eboxhq/moodle[master]$ curl -I http://training.ebox-technologies.com/login/signup.php?course=WNA001 curl: (52) Empty reply from server koke@escher:~/Code/eboxhq/moodle[master]$ curl -I http://training.ebox-technologies.com/login/signup.php?course=WNA001 HTTP/1.1 200 OK The apache conf is quite straightforward and works perfectly in the other vhosts <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /srv/apache/training.ebox-technologies.com/htdocs ServerName training.eboxhq.com ErrorLog /var/log/apache2/training.ebox-technologies.com-error.log CustomLog /var/log/apache2/training.ebox-technologies.com-access.log combined <FilesMatch "\.(ico|gif|jpe?g|png|js|css)$"> ExpiresActive On ExpiresDefault "access plus 1 week" Header add Cache-Control public </FilesMatch> </VirtualHost> Using apache 2.2.9 php 5.2.6 and moodle 1.9.5+ (Build: 20090722) Any ideas welcome :)

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• Is there a way to capture the "network user name" and the "host name" during a "login failed" alert

  - by Jorge Rivera

  I am a SQL Server 7 DBA and I would like to "improve" the default "Login failed" alert that brings SQL 7. I need a way to know what "user" (network user name) was trying to connect to the server (not only the SQL user account) and I would like to know from where the user was trying to connect (the hostname). Does someone know if this is possible? Using the SQL Profiler is not the best way since is a resource consuming task. Would be a way to setup an alert for doing this? Thanks in advance.

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• Cloudstack virtual machines can't communicate with virtual routers when they are on different hosts

  - by Jorge Suárez de Lis

  I'm using Cloudstack 2.2.14 on a Ubuntu 10.04 set of hosts, and I have a problem on my setup. I have two hosts running. When a virtual router is created on host 1 and a virtual machine using that virtual router is created on host 2, or vice versa, I have no connectivity at all on the virtual machine. First of all, I have to setup the network manually on that virtual machine -usually DHCP is working, but not here-. Then, I can't ping to the virtual router from the virtual machine or vice versa. When both virtual router and virtual machine are created on the same host, everything works! Maybe those packages are being filtered somehow? I have no clue on how to proceed. Both hosts can communicate directly outside the virtualization.

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• NFSv3 + ACL: mask is gone on clients

  - by Jorge Suárez de Lis

  I'm sharing a NFS folder among a user group. The default umask on the clients is 0700, and this is a problem because newly created files won't be readable/writable by another users. So, I'm using ACLs to force the umask 0770 on the shared folder, and this works OK on the server, but not on the clients. server # getfacl /export/proyectos getfacl: Eliminando «/» inicial en nombres de ruta absolutos # file: export/proyectos # owner: root # group: root user::rwx group::rwx other::r-x default:user::rwx default:group::rwx default:mask::rwx default:other::r-x server # getfacl /export/proyectos/innovacion getfacl: Eliminando «/» inicial en nombres de ruta absolutos # file: export/proyectos/innovacion # owner: root # group: proyecto-innovacion # flags: ss- user::rwx group::rwx mask::rwx other::--- default:user::rwx default:group::rwx default:mask::rwx default:other::--- As you see, the default (and also a specific on the second directory) mask ACLs are being applied. I mount the whole share on the client: 172.16.54.56:/export/proyectos on /proyectos type nfs (rw,noatime,rsize=131072,wsize=131072,acregmin=10,acl,nfsvers=3,addr=172.16.54.56) But the mask and default:mask ACLs are gone. client $ getfacl /proyectos/ getfacl: Eliminando «/» inicial en nombres de ruta absolutos # file: proyectos/ # owner: root # group: root user::rwx group::rwx other::r-x default:user::rwx default:group::rwx default:other::r-x client $ getfacl /proyectos/innovacion getfacl: Eliminando «/» inicial en nombres de ruta absolutos # file: proyectos/innovacion # owner: root # group: proyecto-innovacion # flags: ss- user::rwx group::rwx other::--- default:user::rwx default:group::rwx default:other::--- It lacks the default:mask and mask ACLs, the only ones that I've setted. So the proposed solution to enforce umask won't work for me. Why is happening this?

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• Filesystem access through web interface

  - by Jorge Suárez de Lis

  I have an SSH+Samba server so people can access its files from anywhere on the network. I thought it would be also interesting to provide access through a web interface, so they can access the files even when they don't have access to the VPN or a Samba/SSH client. Something like the Ubuntu One or Dropbox web interface. The http server could be on the same machine as the SSH+Samba, so it should just provide access to local files and some way to login with their username/password. Someone knows any software like this?

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