Crontab on FEDORA

This is an intentional post to my students at  UNI. We are learning how to use the shell commands on Linux. The simplest example is to register the datatime in a file in my home every 2 minutes.

First, we must check if the crontab file exists. This is located on /etc. Remember that all the files that are inside the /etc directory are managed  by the superuser: root:

Screenshot from 2016-09-02 19:41:02As you see, the last line explains the way to configure “our task”. The first * character set minutes, in this case we are going to write */2:

The last line of the crontab indicates also the user that is going to execute the file “”.

Screenshot from 2016-09-02 20:03:53Besides that, we have created the sh file and we put the right permissions using chmod a+x (a of all and x of executable). Checked the list of the files.

Finally, configure the sh file starting with the header #!/bin/bash and the commands to execute our purpose.  Check the output in the file mentioned:

Screenshot from 2016-09-02 20:19:10My students must do more complex examples, I hope they can enjoy their weekend🙂

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Installing Postgresql with FEDORA

The installation basically is in the official FEDORA documentation. I will put some screenshot that I did to install POSTGRESQL.

The first commands are:

Screenshot from 2016-08-29 18:45:07

Start the postgresql service and make sure it is runnig as ACTIVE:

Screenshot from 2016-08-29 18:55:35If you detect a problem, add the password word in the METHOD column of the pg_hba.conf file which is located at /var/lib/pgsql/data/

Screenshot from 2016-08-29 18:57:44Restart the service to see if it is running OK:

Screenshot from 2016-08-29 18:58:55Now, we are ready to log into the postgresql database and navigate:

Screenshot from 2016-08-29 19:00:29🙂

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CONEISC2016 was held in Pucallpa, Peru and it was an event that gathered more than 1200 people. Students and professionals in the field related to the System Engineering, shared experiences and knowledge about their communities and expertises.


In the middle of the Peruvian jungle, I gave two workshops regarding GNU/Linux during six hours. The first workshop started with the History of Linux, then the introduction to the FEDORA and GNOME projects and how I was involved since 2010 and my experience through all these years. I showed them in links the GNOME and FEDORA communities.


We also celebrated the installation of FEDORA in the Lab of the University for the very first time. Now UNU has its first Lab with Linux(FEDORA). At the end, the GNOME+FEDORA party with the cake and globes were there!


The second day the students browse the usability of FEDORA+GNOME and they use the terminal to write some programs with Python. I taught the vi commands, the applications of GNOME, how to contribute and how to participated to the projects through the OPW and GSoC programs.


The online presence of Athos from FEDORA Brasil for a few minutes was so important to support me. I also invited people to go to FUDCON Puno in October 2016.


I want to thank to HackSpace for the fusion we did during the HACK CAMP 2016 to promote the FEDORA + GNOME use, so now we are able to reach more provinces to evangelize. Hope our friendship will continue as we grow up. Long life for the both projects!❤DSC03006

Thank you so much CONEISC2016 #ViveLaExperiencia

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Hadoop 2.7.1 on a Virtual Machines Cluster

This time I will use FEDORA Server 24 to create four virtual machines. The first one is called “FedoraMaster”:

vm1The configuration is going to be as similar as it is in the Raspberry Pi architecture, with 1GB of memory and 16 GB of disk space and the cpu is Intel 3. The settings of storage and Network must be changed as you need:

Screenshot from 2016-07-13 03-05-41During the installation part, the interfaces must be set as is also needed:

Screenshot from 2016-07-13 03-11-34Generate the keygen and store it in the authorized_keys file:

Screenshot from 2016-07-13 05-05-19Set the /etc/hostname and the /etc/hosts to ensure the remote access.

hadoop2.7Install the package of Java and then set the Download file to store the hadoop2.7.1 installation packages and save the unzip files into the /opt file by using the tar -xvzf hadoop-2.7.1.tar.gz -C /opt/ command.

Set the path to the files .bashrc and

Screenshot from 2016-07-13 05-29-32Configure the hadoop xml files as it is suggested, starting with the core:

vm3Followed by the mapred-site.xml file, that has copied from the template:

Screenshot from 2016-07-13 05-56-45Finally, the yarn file that contains more specification for hardware:

Screenshot from 2016-07-13 06-01-12Finally we run the hadoop namenode -format command and the scripts:

Screenshot from 2016-07-13 06-07-38To run it as a VMCluster, there are some considerations such as:

1.- Set the IPs and hostname, hosts and update the .bashrc and script to the hadoop environment.

2.- Add the IPs in the slave file, which is located inside the hadoop file.

3.- Change the IP on core-site.xml and create a path to store the datanode on each slave node. For more details, you can visit this Website.

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Preparing my first paper related to HPC-BigData

Thanks to Martin Vuelta, it is going to be possible to publish my first paper related to HPC-BigData. I am going to configure Hadoop on ARM processor and Martin is going to configure on Intel Processors. My experience so far:

Setting the Master SD

Download the image from the Raspberry Website and then copy the image of Jessie Lite to the SD 16 GB by using the following command:

img_jessiNow plug the SD to the cluster of ARM processor and then catch the IP using arp-scan.

From my laptop I will enter to the SD using SSH and then type raspi-config:

rasp1Now we can see the options to configure the Raspberry persei:

Screenshot from 2016-07-08 19-33-35This first option will expand the Operative System through the entire SD

Screenshot from 2016-07-08 20-06-19The second option will let you change your password in case you need it:

Screenshot from 2016-07-08 20-09-10Third option will let you configure the starting boot, and I chose Console:

Screenshot from 2016-07-08 20-11-40The four option let us wait first to network at boot:

Screenshot from 2016-07-08 20-16-37Confirm the option chosen:

Screenshot from 2016-07-08 20-16-56We have chosen YES

Screenshot from 2016-07-08 20-17-14To set the international options

Screenshot from 2016-07-08 20-21-08Change Local is the first option that will allow us to change local options:

Screenshot from 2016-07-08 20-24-45Choose English if you dont need another language

Screenshot from 2016-07-08 20-24-45 Screenshot from 2016-07-08 20-27-12Confirm the option by choosing:

Screenshot from 2016-07-08 20-29-18Change the Timezone as your convenience:

Screenshot from 2016-07-08 20-32-52In this case, to set Lima, choose America

Screenshot from 2016-07-08 20-44-32The keyboard options according to the hardware you are going to manage:

Screenshot from 2016-07-08 20-45-44

I will skip the last option as well the WiFi, Enable Camera, Rastrack and Overclock. The Advance Option will let me check that SSH is enabled:

Screenshot from 2016-07-08 21-00-47

Then reboot to update the settings:

Screenshot from 2016-07-08 21-11-15

Setting the network

To set a static, see the content of /etc/network/interfaces below, as well to prepare the Master SD, we have called MasterPi and update the hosts file:

Screenshot from 2016-07-08 22-31-28

SSH Configuration and PIFILE:

Generate the key and add the IP of the master node into the pifile file:

Screenshot from 2016-07-09 21-54-19


Now we are going to install MPIv3, see carefully all the steps done in here:

Screenshot from 2016-07-09 22-07-39Finally, run the make and make install command, then set it on the profile:

Screenshot from 2016-07-09 22-54-01It is so important to reload the configuration of this file by doing source /home/pi/.bashrc, and if the  following test of MPI does not work, reboot it.

Now we can test the MPI by returning the hostname and the PI value:


Clone the SD slaves

First of all, format the SD card

formatThen, the image is going to be copy from the MasterPi SD card to my home:

Screenshot from 2016-07-10 00-52-53

Then, do the copy action to the Slave SD cards.

Update the configuration of each SD card

The specific files are: /etc/hostname, /etc/hosts, /etc/network/interfaces and /home/pi/pifile (in which there are only IPs of the cluster).

Configure the SSH protocol

To allow connection through nodes without asking passwords, set the SSH:sshNOTesting MPI with 4 nodes


Installing Hadoop 2.7.1

Based on this post, we are going to download hadoop files and install them inside /opt:

hadoopExtract the files using tar -xvzf hadoop-2.7.1.tar.gz -C /opt/
Then, update the .bashrc with global variables and run the version:hversionConfiguring JAVA HOME:comandoNow, lets configure all the .xml files by starting with the core-site.xml, based on this Web:


According to this Web, we are going to create the namenode file and set it on hdfs-site.xml

Screenshot from 2016-07-11 19-09-43Then, the mapred-site.xmlmapred

Finally, the yarn-site.xmlScreenshot from 2016-07-11 19-22-07

Make sure before formatting

Permissions and reload of the system is important, you can see some considerations:

Screenshot from 2016-07-11 19-52-38

Starting Hadoop

We need to run the scripts,, and then try with the jps command:

Screenshot from 2016-07-11 20-00-27Setting up the Slave nodes

To start the configuration of the rest of the nodes, we must register them in the master file called slaves. Then we are going to copy the profile we have in the master to the rest nodes:


Install JAVA in all the nodes and copy the Hadoop 2.7.1 package to all the slaves.


Enter to each slave and use the command tar -xvzf hadoop-2.7.1.tar.gz -C /opt/ to install Hadoop and owner the files to pi:

Screenshot from 2016-07-11 22-59-48

Before configuring the xml files, there are some considerations to do in all the slaves nodes


I will present the configuration of one slave node, but basically it is the same for the rest:




Screenshot from 2016-07-12 01-29-39

Now, from the Master node we are going to format and then run the scripts dfs and yarn:

Screenshot from 2016-07-12 03-11-43


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ISC 2016 in My Eyes

During the last week I have participated at the ISC 2016 Conference at Frankfurt, Germany. It has been the most well known HPC event in the world wide for the last five years. From my point of view, it was more than a successful event and it exceed all my expectations.

First of all, more than 3000 attendances gathered to the venue between June 19th and June 23th, and it was not all about quantity; it was definitely about quality too. ISC 2016 congregated TopHPC people from the academia and industry. It was a great opportunity to promote, and maximize potential of HPC projects. The participants presented their HPC efforts, learnt from others, proposed new ones, shared expertise, exchange IT practices and developed new ideas towards the Exascale computing.

Secondly, it was very challenging being surrounded by remarkable people from TOP500 supercomputers, professors and PhD students from prestigious universities such as Stanford, Indiana, Illinois, Southampton and Edinburgh among others, and brilliant researchers from outstanding institutions and centers like NARL, Baidu, PRACE and several HPC specialists from Top IT companies such as Intel, DELL, NVIDIA, Oracle, SAMSUNG, BULL, CRAY, IBM and many more.

Finally, the elegance, efficiency and all the details, even the tiniest ones, were handled with a lot of care. They accomplished all the timing planned, and the passion of the organizers was reflected from the moment the guests arrived to the FestHalle/Messe station. Flags and correct signs were fantastic indicators to reach the place, followed by the people of who were in charge of the registration desk and all ISC 2016 resources in total. I have extremely high recommendation for this event. From my own experience, I would invite you to see my agenda in pictures. Hope you like them.

1. Tutorials:

I chose the Tutorial 05: A Beginner’s Guide to SuperComputing with the Professor Thomas Sterling from Indiana University, who narrowed HPC-BigData definitions from simplest to most complex. I admired his way to teach, so empathetic, engaged and joyful.


At the end of the session, Matthew Anderson allowed us to enter to the bigred2 supercomputer and the application of benchmark with hpl-2.1, hpcg-3.0 and GRAPH500.

Screenshot from 2016-06-19 10-31-25Screenshot from 2016-06-19 10-42-33

2. Conferences:

2.1. Keynotes

Distinguished Speakers: Dr. Andrew Ng, DR. Jacqueline H. Chen & Dr. Thomas Sterling.


2.2. PhD Forum

Tenacious PhD students: Moritz Kreutzer from University of Erlangen-Nuremberg, Huan Zhou from High Performance Computing Center Stuttgart and Juri Schmidt from University of Heidelberg.


2.3. Awards

Honor for Research HPC papers, Student Cluster Competition and TOP500 recognition.


2.4. High Level Talks

Eminent representation from renowned institutions such as GRAY, PRACE, and NASA.


3. Workshop:

3.1. Addressing the gender gap in HPC

Toni Collis and Lorna Rivera from WHPC in ISC16.


3.2. Panel Session

Kimberley McMahon was in charge of the questions  to the panel session.


3.3. Poster Presenter

Mihaela Apetroaie-Cristea, Larisa Stoltzfus and me presented our work to the audience.


3.4. My talk

I presented my job so far in the HPC world and I also mentioned the work as a volunteer of the HPC-BigData group at the CTIC – UNI in Lima, Peru. Thanks for videos InsideHPC !


4. Exhibition:

Well-known HPC-related companies presented their products:Intel, Samsung, IBM (Watson)


5. Other considerations:

 5.1. Location

In the center of Frankfurt, some blocks from FestHalle/Messe


5.2. Spots

Strategies spots along the building were appropriate located, as well as electronic panels, flags in front of the venue and many others useful materials.


5.3. Catering

Breakfast, lunch & dinner was selected carefully for all the rigorous taste and vegetarians


5.4. Interaction events

Welcome Party, Women Lunch thanks to Intel and Happy Hour from 6 to 7 pm in pictures


6. Special Thanks:

Toni, Rebecca and all the women from WHPC, all the members of CTIC – UNI Peru, ISC People (Mihaela, Nages & volunteers) & GNOME friends to support my professional growth


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Preparing my Chikiticluster in Frankfurt to my presentation

I am excited that I will give a poster presentation about my experiences with HPC at #ISC16 I was selected to do it as part of the Women HPC🙂


Setup the SD Master Card:

First I downloaded again the jessie iso from the Raspbian page 2016-05-27 and then copy the image to the SD 32 GB card

Before inserting the SD on your laptop, run df -h, then insert the card and check how is the device called, in this case we have: /dev/mmcblk0p1

Screenshot from 2016-06-21 03-32-11

Now you can umount the file, please notice the number 1 only refers to partition 1, then we can run umount /dev/mmcblk0*

Find the path where you Downloaded the image and then, unzip it by doing unzip [] -d [path_to_unzip] and then make sure you are allowd to run the following command:

dd bs=4M if=2016-05-27-raspbian-jessie.img of=/dev/mmcblk0
958+1 records in
958+1 records out
4019191808 bytes (4.0 GB) copied, 425.597 s, 9.4 MB/s
  • It takes considerable minutes, so you must wait and be patient🙂

Edit the config.txt as follows:

Screenshot from 2016-06-21 08-15-22

… Then, the configuration of the Raspberry PI follows as I wrote in my previous post.

I do not want to miss the opportunity to give a special Thanks to GNOME friends: Tobi and Moira for the excellent hospitality I received, for the moral and material support they gave me to achieve my dreams :3


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