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  • Tools to diagnose Ubuntu problems

    - by Luis Alvarado
    Over time a user will have several problems with Ubuntu as any other OS in the world. What tools and terminal commands exist in Ubuntu to help diagnose how the problem occurred and help solve it if it can be done. Problems like: Ubuntu Freezes after X time or when using Y app Ubuntu rebooted/hibernated/suspended all by itself Ubuntu not showing video or video has problems Ubuntu not making any sound or sound has problems Ubuntu not reading X drive (Pen drive, Internal Drive, External Drive...) Ubuntu slow Ubuntu not working with X hardware when connected Ubuntu network problem Normally there is a couple of GUI tools or Terminal commands that Ubuntu experts typically mention first to use to do a first diagnosis of this. What GUI tools (in case the problem is not related to video or limits the user from using the GUI) and Terminal commands (In case GUI is not working) can a user use to diagnose and help himself to how to find/fix the problem.

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  • What is the difference in Launchpad between Milestones, Series, Versions and other related info

    - by Luis Alvarado
    How can I explain in an easier way to students the following: What are (and difference between) Milestones, Series and Versions in Launchpad and which one is based on what other. What are Blueprints and Bug Reports What are the different values and descriptions for the columns of Priority, Assignee & Delivery in Blueprints What are the different values and descriptions for the columns of Importance, Assignee, Status in Bug Reports

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  • How to create/extract the EDID for/from a Monitor

    - by Luis Alvarado
    Is it possible to create or extract the Extended Display Identification Data (EDID) for/from a monitor. I have some issues with my monitor with the VGA and HDMI cables and I would like to test if by adding the EDID to the Nvidia Settings it could help in solve this issues. With the VGA cable I get a black out error and with the HDMI I get some EDID errors (bad EDID). So how can I create the EDID or extract it from the monitor by detecting its capabilities.

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  • How to find and change the screen DPI

    - by Luis Alvarado
    I am trying to find and then change the screen DPI in 12.04 and 12.10 but I can't seem to find any app or config file that can do this. Is there any app or conf file that I can use to change my screen dpi? Note that this is for 12.04+ so the following will not work: How do I change the font DPI settings? How to change the screen DPI in 11.10? Is it possible to change font DPI in 11.04? They are basically changing the font size, not the actual screen DPI

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  • GUI app for Bandwidth Shaping (Internet Speed Limiter)

    - by Luis Alvarado
    This is a similar question as this one: Limit internet bandwidth but in this case I am looking for a GUI app. The other question was 2+ years ago so a GUI might be available that I could use to not only monitor but also change the maximum speed at which clients can download. A WebApp or a GUI app will help. It needs to work on 12.04 or newer. Just to give an idea, I am looking for something similar to NetLimiter that gives me the control to know: How much Download/Upload speed an IP/Mac has (Assuming this is a LAN) Limit the Download/Upload speed for an IP/Mac. Option to say I what time a speed can be limited or not. Can cap when a certain amount has been downloaded/uploaded (Like 250MB per day)

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  • Is there a way to return a response every x seconds or so to a single http request?

    - by luis
    I'm wondering if it's possible to send a response every second or so to a single http request. Like for example the client makes an http request, then the server sends a space character every second. This could be never ending or with a limit, for example a minute. I think the word 'response' is misleading in this context, since I don't necessarily mean an http response. The whole http response could be composed of the space characters, which would mean a single http response to a single http request, except that it is a minute long. I tried chunked encoding but I don't think it works, or at least my implementation's wrong.

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  • How to lower wait time for repository updates

    - by Luis
    When doing a aptitude update / apt-get update or using the Update Manager to update sometimes I get to a repository link that takes too long. The percent does not end and it takes quite a while before it ignores it. How can I lower the time so that if a particular repository takes more than 10 seconds to connect or finish it should ignore it and move the following ones. Here is an image explaining the problem: It is trying to connect to archive.ubuntu.com but since it is taking too long it just sits there for at least 3 to 5 minutes (Haven't measured the time) and then it shows as ignored and moves to the following. I wish to change that to seconds instead of minutes.

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  • Strange behaviour when screencasting

    - by Luis Alvarado
    Since an update I did yesterday I am not able to screencast any video using Kazam, Recordmydesktop or even ffmpeg/aviconv. After the upgrade to some libraries (A normal update that showed in Update manager) the problem was this: When doing the screencast, scrolling inside an Apps window like Firefox, Chrome or Gedit is not shown. The video only shows the last image it recognized before I started scrolling. For example with Gedit, I have a lot of text on it and when I start to scroll down, the video only shows what I had in the beginning while I listen to myself talk about what is in the rest of the file (Which is not shown in the video). When opening a window, for example again Gedit or Chrome it might not show in the video, it will just show the desktop without the window opened. I do not see any error with dmesg, syslog or others. What can I check to debug this problem?

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  • cryptsetup partitions not detected at boot

    - by Luis
    I installed a fresh 12.04 and tried to mimic what I had for 10.04. swap should be encrypted with a urandom key and there's another partition that will contain home and other directories. # cat /etc/crypttab | grep -v '^#' | grep -v '^$' cryptswap /dev/sda5 /dev/urandom swap encriptado /dev/sda6 # grep -e 'cryptswap' -e 'encriptado' /etc/fstab /dev/mapper/cryptswap swap swap defaults 0 0 /dev/mapper/encriptado /encriptado ext4 defaults 0 0 I also apt-get install cryptsetup When I boot, the system says (try to translate) that either the partition is not found or is not ready. I should wait, press M for manual or S to jump over. What am I missing here?

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  • Lighter in CPU/Memory Usage: Lubuntu or Xubuntu

    - by Luis Alvarado
    I am looking for an Ubuntu version that consumes less Memory and CPU. I have read both Lubuntu and Xubuntu (The homepages, wikipedia, phoronix and other sites comparing both). But from experience, which one uses less memory and is less CPU intensive. I need to install them in very old hardware and want to persuade the owner of the hardware of the benefits of Ubuntu. in this case I want to install 11.10 or 12.04 when it comes out. How are each behaving in those versions? The 2 PCs I will be installing either Xubuntu or Lubuntu are: Granpa PC: CPU - Pentium 2 450Mhz RAM - 64MB DIMM Video - 16MB Used for - Documents and Internet. No listening to music, no looking at videos. Just using it for document writing. The other old meat: CPU - Pentium 3 550Mhz RAM - 128MB DIMM Video - 16MB Used for - Documents and Internet also but they want.. or maybe they are wishing for it to use it to see movies and listen to music. This one has internet. The other one does not.

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  • Google Analytics is not tracking all of our pages

    - by luis
    Our website is insynchq.com. In the All Pages report under Content - Site Content we can only see data for some our pages, like /, /getstarted, and /download. Others, like /gmail, /about, and /mobile are not shown, even if we are sure that there have been visits to them. We use a template for our pages so the scripts that are loaded for / (for example) should also be loaded for /gmail, so it doesn't seem to be a problem with the installation of the tracking code. Can anyone help? Thanks.

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  • jQuery UI + Gmaps = Problems (for me at least) HELP!!

    - by Luis
    Hi there! I started using jQuery as soon as I found out about it, it is very powerfull but I started struggling when I tried to load Gmaps api into the tabs jQuery UI brings. Strangly enough in IE 6,7,8 it works fine, but in Firefox, Safari (I'm using mac but tested it in windows and they both give the same problems) the map doesn't load entirely. When I click on the tab where the map loads in, only part of the map is fully operational, the rest is grey and not clickable. Please take a look at the link below and click the third tab in firefox/safari and IE and you will see the problem. http://movewithusoverseas.com/index-new.php?z=product-info.html&pid=1 I don't know if it is a bug in the jQuery UI code or I'm doing something wrong. If I load the map out of the tabs the map is shown OK. I'm fighting with this problem for a week and a half... any help will be much appreciated. Thanks in advance. Luis

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  • Wireless Bridge with NetGear and TP-Link

    - by Tiago Cruz
    I have a wireless NetGear WGR614 v7 (little old) router connected to the internet, but I can't get a good signal in the other end of my house. I have another new one, model TP-Link TL-WR941ND wireless router. I was able to do the stuff works using a wired cable, but now, I would like to do the same using wireless connections (bridge mode, some like WDS?) Now, the computer connected to TP LINK was able to ping my computer connected to NETGEAR, but we cannot go IP ADDRESS outside my network, only internals ones. What can I do to configure this? Is needed that BOTH wireless routers support BRIDGE mode or only one its good enough? Thanks a lot!!

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  • Linux driver for Intel ICH10R

    - by Pablo Santa Cruz
    Hi! I would like to know what 64-bit Linux distribution can I use with an Intel ICH10R RAID. I have tried CentOS 5.2 and Ubuntu Server 8.04. Neither support that raid controller. Also, I would like to know where do I setup the RAID-5 I want to use. I am using a TYAN S7002 motherboard and the BIOS software does not include an option to configure the RAID as I am used to do with Dell servers... Thanks a lot in advance.

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  • JavaMail application won't send email to external SMTP server

    - by Luiz Cruz
    This is actually a question from an exam, but I believe it could help others troubleshooting a similar situation. In a system, an e-mail needs to be sent to a certain mailbox. The following Java code, which is part of a larger system, was developed for that. Assume that "example.com" corresponds to a valid registered internet domain. public void sendEmail(){ String s1=”Warning”; String b1=”Contact IT support.”; String r1=”[email protected]”; String d1=”[email protected]”; String h1=”mx.intranet”; Properties p1 = new Properties(); p1.put(“mail.host”, h1); Session session = Session.getDefaultInstance(p1, null); MimeMessage message = new MimeMessage(session); try { message.setFrom(new InternetAddress(r1)); message.addRecipient(Message.RecipientType.TO, new InternetAddress(d1)); message.setSubject(s1); message.setText(b1); Transport.send(message); } catch (MessagingException e){ System.err.println(e); } } The execution of this code, within the testing environment of an application server, does NOT work as expected. The mailbox of the "example.com" server never receives the email, even tough all string values in the code are correctly attributed. The output for the command "netstat -np TCP" in the application server during execution is shown bellow: Src Add Src Port Dest Add Dest Port State 192.168.5.5 54395 192.168.7.1 25 SYN_SENT 192.168.5.5 54390 192.168.7.1 110 TIME_WAIT 192.168.5.5 52001 200.218.208.118 80 CLOSE_WAIT 192.168.5.5 52050 200.218.208.118 80 ESTABLISHED 192.168.5.5 50001 200.255.94.202 25 TIME_WAIT 192.168.5.5 50000 200.255.94.202 25 ESTABLISHED With the exception of the lines that were NAT'd, all others are associated with the Java application server, which created them after the execution of the code above. The e-mail server used in this environment is the production server, which is online and does not require any authentication for internal connections. Based on this situation, point out three possible causes for the problem.

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  • TCP/IP networking working as expected, but can't access Windows Shares

    - by Pablo Santa Cruz
    I am trying to fix a Windows 7 Pro SP1 (32 bits) computer. I have a weird problem. It was working fine until two days ago (didn't do anything weird in that day), and suddenly windows network (accessing to Windows Shares, sharing my printer) stopped working. TCP/IP networks words without issues, since I can IM, use the WebBrowser, check my email, you name it. Any ideas on how could I attempt to fix this?

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  • Postfixadmin Invalid Query

    - by Jm Cruz
    This is my first time running a postfixadmin, so in my setup.php, I'm getting this error DEBUG INFORMATION: Invalid query: Unknown column 'create_date' in 'mailbox' I'm running it with MySQL. So if i'm right, my guess is that i need to create a column? under mailbox table on the postfix database? but how or whats the right syntax into creating a timedate column? My knowledge with mysql and postfix are very minimal btw. Thanks in advance.

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  • tcpdump output with iptables REJECT policy enabled

    - by Pablo Santa Cruz
    Hi all, Quick question. I have a firewall with these simple rules: iptables -A INPUT -p tcp -s 127.0.0.1/32 --dport 6000 -j ACCEPT iptables -A INPUT -p tcp -s 192.168.16.20/32 --dport 6000 -j ACCEPT iptables -A INPUT -p tcp --dport 6000 -j REJECT Now, suppose I am using TCPDUMP like this: tcpdump port 6000 And I have host 192.168.16.21 trying to connect to port 6000. My question is: will/should tcpdump output some packages coming from 192.168.16.21?

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  • System Requirements of a write-heavy applications serving hundreds of requests per second

    - by Rolando Cruz
    NOTE: I am a self-taught PHP developer who has little to none experience managing web and database servers. I am about to write a web-based attendance system for a very large userbase. I expect around 1000 to 1500 users logged-in at the same time making at least 1 request every 10 seconds or so for a span of 30 minutes a day, 3 times a week. So it's more or less 100 requests per second, or at the very worst 1000 requests in a second (average of 16 concurrent requests? But it could be higher given the short timeframe that users will make these requests. crosses fingers to avoid 100 concurrent requests). I expect two types of transactions, a local (not referring to a local network) and a foreign transaction. local transactions basically download userdata in their locality and cache it for 1 - 2 weeks. Attendance equests will probably be two numeric strings only: userid and eventid. foreign transactions are for attendance of those do not belong in the current locality. This will pass in the following data instead: (numeric) locality_id, (string) full_name. Both requests are done in Ajax so no HTML data included, only JSON. Both type of requests expect at the very least a single numeric response from the server. I think there will be a 50-50 split on the frequency of local and foreign transactions, but there's only a few bytes of difference anyways in the sizes of these transactions. As of this moment the userid may only reach 6 digits and eventid are 4 to 5-digit integers too. I expect my users table to have at least 400k rows, and the event table to have as many as 10k rows, a locality table with at least 1500 rows, and my main attendance table to increase by 400k rows (based on the number of users in the users table) a day for 3 days a week (1.2M rows a week). For me, this sounds big. But is this really that big? Or can this be handled by a single server (not sure about the server specs yet since I'll probably avail of a VPS from ServInt or others)? I tried to read on multiple server setups Heatbeat, DRBD, master-slave setups. But I wonder if they're really necessary. the users table will add around 500 1k rows a week. If this can't be handled by a single server, then if I am to choose a MySQL replication topology, what would be the best setup for this case? Sorry, if I sound vague or the question is too wide. I just don't know what to ask or what do you want to know at this point.

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  • Achieving/maxing out 1GBPS connectivity on a nginx server

    - by Ansell Cruz
    This page (http://www.remsys.com/nginx-on-1gbps) claims that it can max out a 1gbps line using JBOD setup and no raid. Currently I'm on a 1gbps dedicated port and I'm on raid 10 (4x2TB - the disks that comes with 100tb.com servers). Currently I'm only peaking at 500-550mbps. wa% would show something around 20% everytime. I'm looking into maxing out this 1gbps port because I have an unmetered service from them. Do you guys think that the page that I referenced would be better than my current raid setup? Do you guys have any other suggestions on how to max out the performance of this server? TYI.

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  • Centos expanding directory

    - by Ansell Cruz
    I currently have a file server, all the files are installed in /usr/local/nginx/html/. The setup is 1 hard disk with 1TB of data. This 1TB of storage is all used up. I asked the guys to add 2 HDDs with 2TB each. This new HDDs will be used for new storage of files. Now, if I mount this 2 new HDDs into /usr/local/nginx/html/, the current files in there will be deleted. My goal is to expand the storage in /usr/local/nginx/html/ without losing data in it. Would this be possible?

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  • MySQL Connect 8 Days Away - Replication Sessions

    - by Mat Keep
    Following on from my post about MySQL Cluster sessions at the forthcoming Connect conference, its now the turn of MySQL Replication - another technology at the heart of scaling and high availability for MySQL. Unless you've only just returned from a 6-month alien abduction, you will know that MySQL 5.6 includes the largest set of replication enhancements ever packaged into a single new release: - Global Transaction IDs + HA utilities for self-healing cluster..(yes both automatic failover and manual switchover available!) - Crash-safe slaves and binlog - Binlog Group Commit and Multi-Threaded Slaves for high performance - Replication Event Checksums and Time-Delayed replication - and many more There are a number of sessions dedicated to learn more about these important new enhancements, delivered by the same engineers who developed them. Here is a summary Saturday 29th, 13.00 Replication Tips and Tricks, Mats Kindahl In this session, the developers of MySQL Replication present a bag of useful tips and tricks related to the MySQL 5.5 GA and MySQL 5.6 development milestone releases, including multisource replication, using logs for auditing, handling filtering, examining the binary log, using relay slaves, splitting the replication stream, and handling failover. Saturday 29th, 17.30 Enabling the New Generation of Web and Cloud Services with MySQL 5.6 Replication, Lars Thalmann This session showcases the new replication features, including • High performance (group commit, multithreaded slave) • High availability (crash-safe slaves, failover utilities) • Flexibility and usability (global transaction identifiers, annotated row-based replication [RBR]) • Data integrity (event checksums) Saturday 29th, 1900 MySQL Replication Birds of a Feather In this session, the MySQL Replication engineers discuss all the goodies, including global transaction identifiers (GTIDs) with autofailover; multithreaded, crash-safe slaves; checksums; and more. The team discusses the design behind these enhancements and how to get started with them. You will get the opportunity to present your feedback on how these can be further enhanced and can share any additional replication requirements you have to further scale your critical MySQL-based workloads. Sunday 30th, 10.15 Hands-On Lab, MySQL Replication, Luis Soares and Sven Sandberg But how do you get started, how does it work, and what are the best practices and tools? During this hands-on lab, you will learn how to get started with replication, how it works, architecture, replication prerequisites, setting up a simple topology, and advanced replication configurations. The session also covers some of the new features in the MySQL 5.6 development milestone releases. Sunday 30th, 13.15 Hands-On Lab, MySQL Utilities, Chuck Bell Would you like to learn how to more effectively manage a host of MySQL servers and manage high-availability features such as replication? This hands-on lab addresses these areas and more. Participants will get familiar with all of the MySQL utilities, using each of them with a variety of options to configure and manage MySQL servers. Sunday 30th, 14.45 Eliminating Downtime with MySQL Replication, Luis Soares The presentation takes a deep dive into new replication features such as global transaction identifiers and crash-safe slaves. It also showcases a range of Python utilities that, combined with the Release 5.6 feature set, results in a self-healing data infrastructure. By the end of the session, attendees will be familiar with the new high-availability features in the whole MySQL 5.6 release and how to make use of them to protect and grow their business. Sunday 30th, 17.45 Scaling for the Web and the Cloud with MySQL Replication, Luis Soares In a Replication topology, high performance directly translates into improving read consistency from slaves and reducing the risk of data loss if a master fails. MySQL 5.6 introduces several new replication features to enhance performance. In this session, you will learn about these new features, how they work, and how you can leverage them in your applications. In addition, you will learn about some other best practices that can be used to improve performance. So how can you make sure you don't miss out - the good news is that registration is still open ;-) And just to whet your appetite, listen to the On-Demand webinar that presents an overview of MySQL 5.6 Replication.  

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  • Updating records with their subordinates via CTE or subquery

    - by Mike Jolley
    Let's say I have a table with the following columns: Employees Table employeeID int employeeName varchar(50) managerID int totalOrganization int managerID is referential to employeeID. totalOrganization is currently 0 for all records. I'd like to update totalOrganization on each row to the total number of employees under them. So with the following records: employeeID employeeName managerID totalOrganization 1 John Cruz NULL 0 2 Mark Russell 1 0 3 Alice Johnson 1 0 4 Juan Valdez 3 0 The query should update the totalOrganizations to: employeeID employeeName managerID totalOrganization 1 John Cruz NULL 3 2 Mark Russell 1 0 3 Alice Johnson 1 1 4 Juan Valdez 3 0 I know I can get somewhat of an org. chart using the following CTE: WITH OrgChart (employeeID, employeeName,managerID,level) AS ( SELECT employeeID,employeeName,0 as managerID,0 AS Level FROM Employees WHERE managerID IS NULL UNION ALL SELECT Employees.employeeID,Employees.employeeName,Employees.managerID,Level + 1 FROM Employees INNER JOIN OrgChart ON Employees.managerID = OrgChart.employeeID ) SELECT employeeID,employeeName,managerID, level FROM OrgChart; Is there any way to update the Employees table using a stored procedure rather than building some routine outside of SQL to parse through the data?

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  • ArchBeat Link-o-Rama for October 22, 2013

    - by OTN ArchBeat
    The road ahead for WebLogic 12c | Edwin Biemond Oracle ACE Edwin Biemond shares his thoughts on announced new features in Oracle WebLogic 12.1.3 & 12.1.4 and compares those upcoming releases to Oracle WebLogic 12.1.2. Oracle BI Apps 11.1.1.7.1 – GoldenGate Integration - Part 2: Setup and Configuration | Michael Rainey Michael Rainey continues his series with another technical article for you GoldenGate fans. There's A Virtual Developer Day in Your Future Have you experienced OTN VDD? Relax, it's not something that requires medical attention. But an OTN Virtual Developer Day event will enlarge your brain with hands-on information on Oracle technologies. Upcoming events will cover Oracle WebLogic and Coherence (Nov 5) and Oracle ADF (Nov 19). My Summary of Oracle Open World 2013 | Luis Weir SOA/Middleware specialist Luis Weir's first trip to Oracle OpenWorld was what you might call a total immersion experience. His blog post includes details about what kept him very, very busy during his OOW13 experience. Live Blog: Book Review of Building Modular Cloud Apps with OSGi by Bert Ertman and Paul Bakker | Lucas Jellema This interesting post from Oracle ACE Director Lucas Jellema is a work in progress. He's updating as he goes. Check it out. Thought for the Day padding-left: 20px; padding-right: 20px;"> "In the information age, you don't teach philosophy as they did after feudalism. You perform it. If Aristotle were alive today he'd have a talk show." — Timothy Leary, American psychologist and writer (October 22, 1920 – May 31, 1996) Source: brainyquote.com

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