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Quick Access to my selection Last Update: 2021-11-16 13:22:57 IST (Irish Standard Time) Unix epoch: 1637068977

Cloud Computing

Operations Engineering/DevOps/SRE

Engineering

Miscellaneous

Migrating my 11 years Amazon AWS account services (Postmortem Analysis)
Why I migrated my Services out of Amazon AWS, how I did, the problems I had and the mistakes I did.
2021-Nov Views: 185 views
Upgrading Amazon AWS EC2 Ubuntu 18.04 LTS to Ubuntu 20.04 LTS
Upgrading Amazon EC2 Instance with LAMP from Ubuntu Linux 18.04 LTS to version 20.04 LTS.
2021-June Views: 602 views
How to recover access to your Amazon AWS EC2 instance if you loss your Private Key for SSH
Procedure to get access to an Amazon AWS EC2 Instance and its Data, after you have lost your SSH Private Key and access to the instances using that Key pair.
2020-Sept Views: 3,197 views
Benchmarking Google Cloud Compute Engine (2015)
The analysis I did from Google Compute Engine, in my project CMIPS, when google launched their GCE in beta.
Paul Nash wrote me and I helped all the Cloud Team to fix some problems. :)
This analysis is a bit old however contains some interesting information.
2015-Jan
Comparison of Cloud Provider’s Instances performance
From my CMIPS (Cloud Million Instructions per second) a performance comparison of different Instances, from different Cloud Providers, compared to bare metal as well.
Is old, from 2015, however brings very valuable information.
2015-Jan
The Cloud is for Scaling
The Cloud is for Startups, and for Scaling and for Enterprises. Nothing more. 2013-Sept Views: 9,414 views

Linux Command Line tools I usually install (if they are not on the system)
2016-March Views: 10,756 views
Troubleshooting upgrading and loading a ZFS module in RHEL7.4 2018-July Views: 9,612 views
A sample forensic post mortem for a iSCSI Initiator (client) that had connectivity problems to the Server (Troubleshooting) 2019-August Views: 4,760 views
Creating a content filter for Postfix in PHP 2016-June Views: 22,979 views
Stopping definitively the massive Distributed DoS attack 2015-Feb Views: 24,928 views
Stopping and investigating a DoS XMLRPC attack 2014-August Views: 144,011 views
Stopping a BitTorrent DDoS attack 2015-January Views: 64,336 views
Dropping caches in Linux, to check if memory is actually being used 2019-April Views: 1,574 views
Troubleshooting a shell prompt irresponsible/that locks intermittently 2020-April Views: 3,643 views
Post-Mortem: The mystery of the duplicated Transactions into an e-Commerce
2020-Nov Views: 3,511 views
Adding a swapfile on the fly as a temporary solution for a Server with few memory 2020-Nov Views: 898 views
Swap, swappiness, Servers not responding
2021-May Views: 1,348 views

Performance of Several Languages
2014-Oct Views: 173,247 views
CSort Multithread versus Quicksort (Java) 2017-March Views: 19,371 views
CSort my algorithm that heavily beats Quicksort (Java) 2015-May Views: 13,148 views

How is: Working in Cork for IT Engineers
2020-Feb Views: 4,229 views
How is: Working in Barcelona for IT Engineers
2020-Feb Views: 4,041 views
A mistake that all the universities are doing
2018-Jun Views: 5,945 views
Some advice for WFH (Working from Home/Remotely)
2020-May Views: 6,047 views
News from the Blog 2021-11-11
2021-November Views: 172 views
News from the Blog 2021-10-21
2021-October Views: 226 views
News from the Blog 2021-10-10
2021-October Views: 260 views
News from the Blog 2021-09-07
2021-September Views: 369 views
News from the Blog 2021-08-16
2021-August Views: 529 views
News from the Blog 2021-07-23
2021-August Views: 522 views
News from the Blog 2021-07-01
2021-August Views: 602 views
News from the Blog 2021-05-22
2021-May Views: 1,367 views
News from the Blog 2021-03-21
2021-Mar Views: 1,534 views
News from the Blog 2021-03-04
2021-Mar Views: 1,468 views
News from the blog 2021-02-10
2021-Feb Views: 625 views
News from the blog 2021-01-11
2021-Jan Views: 1,499 views
News from the blog 2020-12-16
2020-Dec Views: 1,583 views
News from the blog 2020-11-23
2020-Nov Views: 1,532 views
News from the blog 2020-11-11
2020-Nov Views: 2,189 views
News from the blog 2020-11-03
2020-Nov Views: 2,562 views
News from the blog 2020-10-16
2020-Oct Views: 2,546 views
News from the blog 2020-09-21
2020-Sept Views: 2,845 views
News from the blog 2020-08-19
2020-Aug Views: 2,381 views
News from the blog 2020-08-10
2020-Aug Views: 2,422 views
News from the blog 2020-07-19
2020-July Views: 2,285 views

Python

PHP

Java

Bash

Lesson 0, learning to code in Python for non programmers
2020-March Views: 4,106 views
Video for beginners: Python for, range, lists, dicts
2021 July Views: 746 views
Programming class for beginners on 2021-11-11.
2021-November Views: 141 views
Learn to do Unit Testing with pytest in Python 3.
2021-October Views: 232 views
A handy trick command line to get the usages of our Python Methods in the code
2019-July Views: 3,835 views

A small Python + MySql + Docker program as a sample (plus LAMP PHP sample).
2021-July Views: 1,808 views

A simple Flask Application, a Star Wars game in Python and Docker.
2021-July Views: 760 views

A simple Python Tic Tac Toe game.
2021-September Views: 373 views

Some weird things from Python 3 that you may not know.
2021-September Views: 395 views

Generating a Word Cloud of Tags in Python.
2021-September Views: 337 views

Some graphics with matplotlib.
2021-October Views: 351 views

Web Top – Displaying top with Python 3 Web Server and carleslibs.
2021-October Views: 306 views

MT Notation prefix variables system for Python
Last Update: 2021-07-15
Views: 3,834 views

My PHP Script to see WordPress Posts and Views ordered by Views
2021-August Views: 692 views
Improving performance in PHP
2014-August Views: 23,889 views
Catalonia Framework PHP Open Source
MT Notation prefix variables system for PHP
From: 2014-July Last Update: 2021-07-15 Views: 4,572 views

Java validation Classes for Keyboard
2020-Dec Views: 23,654 views
MT Notation prefix variables system for Java
From: 2017-March Views: 3,520 views

compress_old.sh A simple Bash script to compress files in a directory, older than n days
2021-March Views: 1,681 views
A simple script to upload a pypi/pip package
2021-March Views: 1,555 views

Docker

Commodity Hardware

ZFS

Architecture

Communicating with Docker Containers via Linux Signals and Python
2021-Nov Views: 174 views
Refreshing settings in a Docker immutable image with Python and Flask
2020-May Views: 3,776 views
In March 2021, Why I propose you to use Python 3.8, at least, for your Internal Automation Tools in Docker Containers and Ubuntu 20.04 LTS 2021-March Views: 1,804 views
Solving the problem when running a Docker Container: standard_init_linux.go:190: exec user process caused “no such file or directory” 2021-March Views: 2,714 views
Adding my Server as Docker, with PHP Catalonia Framework, explained
2019-July Views: 5,366 views
A base Dockerfile for my Jenkins deployments 2021-March Views: 2,023 views
Migrating some Services from Amazon AWS EC2 to Digital Ocean, using Docker 2021-Aug Views: 1,032 views
Have a cheap Ubuntu in your Windows or Mac with Docker 2021-September Views: 694 views

Dealing with Performance degradation on ZFS (DRAID) Rebuilds when migrating from a single processor to a multiprocessor platform (Troubleshooting explained)
2019-June Views: 4,502 views
Solving a persistent MDRAID and ZFS problem in RHEL7.4 (Dual Port SAS drives)
2018-Oct Views: 4,172 views
Simulating a SAS physical pull out of a drive
2019-March Views: 4,069 views
Create a small partition on the drives for tests
2019-April Views: 4,210 views

Adding a RAMDISK as SLOG ZIL to ZFS
2020-August Views: 5,096 views
Some handy tricks for working with ZFS
2019-June Views: 4,294 views
ZFS Improving iSCSI for Block Devices (trick for Volumes)
2018-Oct Views: 6,932 views
Creating a compressed filesystem with Linux and ZFS
2018-Sept Views: 5,142 views
Compiling ZFS with RHEL6.10
2019-August Views: 3,921 views
My talk at OpenZFS 2018 about DRAID (San Francisco, US) 2018-Sept Views: 5,436 views
Extend existing Single ZFS disk with a mirror without losing the Data on the existing drive
2021-Jan Views: 2,329 views

Resources for Microservices and Business Domain Solutions for the Cloud Architect / Microservices Architect
2019-Oct Views: 4,366 views
Scaling PhantomJS with PHP
2015-June Views: 20,266 views
Improving Performance in PHP (Stack and tricks)
2014-August Views: 23,889 views
Begin developing in Cassandra in Java, PHP or Python
2014-July Views: 11,125 views

Windows

Raspberry Pi

Cassandra

Relational Databases

Solving Windows 10 PRO running Active Directory as Domain Admin
2021-Jan Views: 1,561 views
Install Windows Subsystem for Linux, WSL 2 on Windows 10 64 bit, with Ubuntu, solution to error WslRegisterDistribution failed with error: 0x80070057
2021-Jan Views: 12,476 views
Programs I use for Windows in my Workstations
2019-Sept Views: 2,279 views
Using Windows 10 Appliance in Ubuntu Virtual Box 4.3.10 and later versions
2015-August Views: 31,534 views
Reinstall PIP only in Windows 10 after it got removed
2021-March Views: 1,470 views

Install a Media Player on the Raspberry Pi 4
2020-March Views: 2,260 views

Raspberry Pi 3 and OMSC Media Player
2015-April Views: 12,158 views

Solving the problem GPIO.setup(self.number, GPIO.IN, self.GPIO_PULL_UPS[self._pull]) RuntimeError: Not running on a RPi! in Ubuntu 20.04LTS
2021-Feb Views: 3,054 views

CQLSÍ a wrapper to use Cassandra from PHP
Written in 2014, a time when there were no drivers for PHP.
2014 Views: 111 views

Cassandra Universal Driver
A HTTP gateway for all the languages supporting curl/sockets. Written in 2014, a time when there were no drivers for many languages.
2014 Views: 124 views

Solving Oracle error ORA 600 [KGL-heap-size-exceeded]
2021-Febreruary Views: 5,734 views

Python Open Source Utilities

Bash Open Source Utilities

My Tech Talks

My Books

CTOP.py SysAdmin tool to get all the System Information at a glance
2020-Jan Views: 7,264 views

Simple sample to print colors in Terminal
2018-May Views: 7,383 views

LDAPGUI.py a simple Python GUI application that queries LDAP
2020-Jun Views: 3,779 views

cmemgzip.py compress logs (and any file) in memory and replace uncompressed files by .gz when drive has no space left. Supports compressing by blogs to use less memory
2021-Feb Views: 1,678 views

checkswap.py Monitor the impact of swap memory pages on a live system. Compatible with Python 2.x and 3.x
2021-May Views: 1,348 views

Carleslibs v. 1.0.2 Python Open Source package.
2021-July (Updated 2021-August)Views: 683 views

Cliptype is a utility to paste the Clipboard into the focussed Windows. Ideal for working with Web SSH Terminal clients/QEMU/KVM that don’t support paste
2021-NovemberViews: 103 views

count_repeated_pattern_in_logs.sh
A easy way to see errors that are repeating, e.g.: NFS/iSCSI timeouts.
2020-May Views: 3,902 views
backup_partition_in_files.sh
Compressing an unmounted partition to a image file while compressing on the fly, and breaking into 1GB gz files.
Also explains in a funny way about STDIN, STDOUT, STDERR and methodology investigating in deep.
2020-May Views: 4,121 views
iostat_bandwidth.sh
See the aggregated bandwidth used by all the drives, and the maximum speed achieved.
2020-Aug Views: 3,234 views
count_lines_of_code.sh
Count the lines in .py Python source files recursively and displays individual and total results.
2021-Jan Views: 2,055 views
One line script to log the temperature of HDDs and CPUs in Ubuntu
2021-Jan Views: 1,612 views

My talk at OpenZFS 2018 about DRAID (San Francisco, US)

2018-Sept Views: 5,436 views
Google Compute Engine Talk for Group Google Developers Cork, Ireland

How to do autoscaling from 0 using Google Cloud.
2019-Feb Views: 3,833 views

Buy my books:
Python 3 Combat Guide
Pages: 403 DIN-A4 PDF DRM-free
Accompanying Source Code: https://gitlab.com/carles.mateo/python_combat_guide
Last Update: v.1.05 2021-10-20

Assemble and upgrade your PC and laptops
Pages: 107 DIN-A4 PDF DRM-free
Last Update: v.0.17 2021-01-13

ZFS on Ubuntu 20.04 LTS
Pages: 140 DIN-A4 PDF DRM-free
Covers ZFS 0.8.3 version. Shows tricks, fix errors, secrets and commands against real systems with LSI Controllers, SAS SLOG ZIL devices, SATA, SSD…
Last Update: v.0.24 2021-08-02

Python 3 Exercises for Beginners
Pages: 195 DIN-A4 PDF DRM-free
Last Update: v.40 2021-10-12

Docker Combat Guide
Pages: 121 DIN-A4 PDF DRM-free
Last Update: v.14 2021-11-10

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Carles Mateo

Blog on extreme IT, Development, Clouds, SRE, Operations, Start ups, Security, CTO and my thoughts

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