You have installed eZ Launchpad, and you can execute the binary ez from your home folder or other paths, however when you execute it from a project folder you cloned with git (with its .platform.app.yaml file) ez returns to prompt without any error message.
The exit code is 255, but even if you strace the process you don’t find the exact problem.
Inside your project you run ez without any argument in a clean install of Ubuntu 24.04 LTS with PHP 8.3, or with PHP 8.4, without xDebug, without opcache, without memory limit… nothing works with no visible error message in the logs or in the error output. However if you run it outside the project folder, it works, and it displays the typical help messages.
I reproduced this behavior on several Ubuntu computers. The fix I found is to execute ez with PHP 8.1
You can install PHP8.1 from ondrej repository, then you can update alternates to execute PHP 8.1 by default in your system, or you create the project by invoking ez with PHP 8.1 explicitly with:
php8.1 ~/ez create
This will kickstart the creation of your ez project based on Docker containers.
This is a mechanism I invented and I’ve been using for decades, to migrate or clone my Linux Desktops to other physical servers.
This script is focused on doing the job for Ubuntu but I was doing this already 30 years ago, for X Window as I was responsible of the Linux platform of a ISP (Internet Service Provider). So, it is compatible with any Linux Desktop or Server.
It has the advantage that is a very lightweight backup. You don’t need to backup /etc or /var as long as you install a new OS and restore the folders that you did backup. You can backup and restore Wine (Windows Emulator) programs completely and to/from VMs and Instances as well.
It’s based on user/s rather than machine.
And it does backup using the Timestamp, so you keep all the different version, modified over time. You can fusion the backups in the same folder if you prefer avoiding time versions and keep only the latest backup. If that’s your case, then replace s_PATH_BACKUP_NOW=”${s_PATH_BACKUP}${s_DATETIME}/” by s_PATH_BACKUP_NOW=”${s_PATH_BACKUP}” for instance. You can also add a folder for machine if you prefer it, for example if you use the same userid across several Desktops/Servers.
I offer you a much simplified version of my scripts, but they can highly serve your needs.
#!/usr/bin/env bash
# Author: Carles Mateo
# Last Update: 2022-10-23 10:48 Irish Time
# User we want to backup data for
s_USER="carles"
# Target PATH for the Backups
s_PATH_BACKUP="/home/${s_USER}/Desktop/Bck/"
s_DATE=$(date +"%Y-%m-%d")
s_DATETIME=$(date +"%Y-%m-%d-%H-%M-%S")
s_PATH_BACKUP_NOW="${s_PATH_BACKUP}${s_DATETIME}/"
echo "Creating path $s_PATH_BACKUP and $s_PATH_BACKUP_NOW"
mkdir $s_PATH_BACKUP
mkdir $s_PATH_BACKUP_NOW
s_PATH_KEY="/home/${s_USER}/Desktop/keys/2007-01-07-cloud23.pem"
s_DOCKER_IMG_JENKINS_EXPORT=${s_DATE}-jenkins-base.tar
s_DOCKER_IMG_JENKINS_BLUEOCEAN2_EXPORT=${s_DATE}-jenkins-blueocean2.tar
s_PGP_FILE=${s_DATETIME}-pgp.zip
# Version the PGP files
echo "Compressing the PGP files as ${s_PGP_FILE}"
zip -r ${s_PATH_BACKUP_NOW}${s_PGP_FILE} /home/${s_USER}/Desktop/PGP/*
# Copy to BCK folder, or ZFS or to an external drive Locally as defined in: s_PATH_BACKUP_NOW
echo "Copying Data to ${s_PATH_BACKUP_NOW}/Data"
rsync -a --exclude={} --acls --xattrs --owner --group --times --stats --human-readable --progress -z "/home/${s_USER}/Desktop/data/" "${s_PATH_BACKUP_NOW}data/"
rsync -a --exclude={'Desktop','Downloads','.local/share/Trash/','.local/lib/python2.7/','.local/lib/python3.6/','.local/lib/python3.8/','.local/lib/python3.10/','.cache/JetBrains/'} --acls --xattrs --owner --group --times --stats --human-readable --progress -z "/home/${s_USER}/" "${s_PATH_BACKUP_NOW}home/${s_USER}/"
rsync -a --exclude={} --acls --xattrs --owner --group --times --stats --human-readable --progress -z "/home/${s_USER}/Desktop/code/" "${s_PATH_BACKUP_NOW}code/"
echo "Showing backup dir ${s_PATH_BACKUP_NOW}"
ls -hal ${s_PATH_BACKUP_NOW}
df -h /
See how I exclude certain folders like the Desktop or Downloads with –exclude.
It relies on the very useful rsync program. It also relies on zip to compress entire folders (PGP Keys on the example).
If you use the second part, to compress Docker Images (Jenkins in this example), you will run it as sudo and you will need also gzip.
There is a final part, if you want to backup to a remote Server/s using ssh:
# continuation... to copy to a remote Server.
s_PATH_REMOTE="bck7@cloubbck11.carlesmateo.com:/Bck/Desktop/${s_USER}/data/"
# Copy to the other Server
rsync -e "ssh -i $s_PATH_KEY" -a --exclude={} --acls --xattrs --owner --group --times --stats --human-readable --progress -z "/home/${s_USER}/Desktop/data/" ${s_PATH_REMOTE}
I recommend you to use the same methodology in all your Desktops, like for example, having a data/ folder in the Desktop for each user.
You can use Erasure Code to split the Backups in blocks and store a piece in different Cloud Providers.
Also you can store your Backups long-term, with services like Amazon Glacier.
Other ideas are storing certain files in git and in Hadoop HDFS.
If you want you can CRC your files before copying to another device or server.
FROM ubuntu:20.04
MAINTAINER Carles Mateo
ARG DEBIAN_FRONTEND=noninteractive
# This will make sure printing in the Screen when running in detached mode
ENV PYTHONUNBUFFERED=1
RUN apt-get update -y && apt install -y sudo telnetd vim systemctl && apt-get clean
RUN adduser -gecos --disabled-password --shell /bin/bash telnet
RUN echo "telnet:telnet" | chpasswd
EXPOSE 23
CMD systemctl start inetd; while [ true ]; do sleep 60; done
You can see that I use chpasswd command to change the password for the user telnet and set it to telnet. That deals with the complexity of setting the encrypted password.
File: build_docker.sh
#!/bin/bash
s_DOCKER_IMAGE_NAME="ubuntu_telnet"
echo "We will build the Docker Image and name it: ${s_DOCKER_IMAGE_NAME}"
echo "After, we will be able to run a Docker Container based on it."
printf "Removing old image %s\n" "${s_DOCKER_IMAGE_NAME}"
sudo docker rm "${s_DOCKER_IMAGE_NAME}"
printf "Creating Docker Image %s\n" "${s_DOCKER_IMAGE_NAME}"
sudo docker build -t ${s_DOCKER_IMAGE_NAME} .
# If you don't want to use cache this is your line
# sudo docker build -t ${s_DOCKER_IMAGE_NAME} . --no-cache
i_EXIT_CODE=$?
if [ $i_EXIT_CODE -ne 0 ]; then
printf "Error. Exit code %s\n" ${i_EXIT_CODE}
exit
fi
echo "Ready to run ${s_DOCKER_IMAGE_NAME} Docker Container"
echo "To run in type: sudo docker run -it -p 23:23 --name ${s_DOCKER_IMAGE_NAME} ${s_DOCKER_IMAGE_NAME}"
When you run sudo ./build_docker.sh the image will be built. Then run it with:
sudo docker run -it -p 23:23 --name ubuntu_telnet ubuntu_telnet
If you get an error indicating that the port is in use, then your computer has already a process listening on the port 23, use another.
You will be able to stop the Container by pressing CTRL + C
One interesting aspect is that I cover how the messages are delivered as byte sequence. I show this by sending Unicode characters
Files in the project
Dockerfile
FROM ubuntu:20.04
MAINTAINER Carles Mateo
ARG DEBIAN_FRONTEND=noninteractive
# This will make sure printing in the Screen when running in dettached mode
ENV PYTHONUNBUFFERED=1
ARG PATH_RABBIT_INSTALL=/tmp/rabbit_install/
ARG PATH_RABBIT_APP_PYTHON=/opt/rabbit_python/
RUN mkdir $PATH_RABBIT_INSTALL
COPY cloudsmith.sh $PATH_RABBIT_INSTALL
RUN chmod +x ${PATH_RABBIT_INSTALL}cloudsmith.sh
RUN apt-get update -y && apt install -y sudo python3 python3-pip mc htop less strace zip gzip lynx && apt-get clean
RUN ${PATH_RABBIT_INSTALL}cloudsmith.sh
RUN service rabbitmq-server start
RUN mkdir $PATH_RABBIT_APP_PYTHON
COPY requirements.txt $PATH_RABBIT_APP_PYTHON
WORKDIR $PATH_RABBIT_APP_PYTHON
RUN pwd
RUN pip install -r requirements.txt
COPY *.py $PATH_RABBIT_APP_PYTHON
COPY loop_send_get_messages.sh $PATH_RABBIT_APP_PYTHON
RUN chmod +x loop_send_get_messages.sh
CMD ./loop_send_get_messages.sh
cloudsmith.sh
#!/usr/bin/sh
# From: https://www.rabbitmq.com/install-debian.html#apt-cloudsmith
sudo apt-get update -y && apt-get install curl gnupg apt-transport-https -y
## Team RabbitMQ's main signing key
curl -1sLf "https://keys.openpgp.org/vks/v1/by-fingerprint/0A9AF2115F4687BD29803A206B73A36E6026DFCA" | sudo gpg --dearmor | sudo tee /usr/share/keyrings/com.rabbitmq.team.gpg > /dev/null
## Cloudsmith: modern Erlang repository
curl -1sLf https://dl.cloudsmith.io/public/rabbitmq/rabbitmq-erlang/gpg.E495BB49CC4BBE5B.key | sudo gpg --dearmor | sudo tee /usr/share/keyrings/io.cloudsmith.rabbitmq.E495BB49CC4BBE5B.gpg > /dev/null
## Cloudsmith: RabbitMQ repository
curl -1sLf https://dl.cloudsmith.io/public/rabbitmq/rabbitmq-server/gpg.9F4587F226208342.key | sudo gpg --dearmor | sudo tee /usr/share/keyrings/io.cloudsmith.rabbitmq.9F4587F226208342.gpg > /dev/null
## Add apt repositories maintained by Team RabbitMQ
sudo tee /etc/apt/sources.list.d/rabbitmq.list <<EOF
## Provides modern Erlang/OTP releases
##
deb [signed-by=/usr/share/keyrings/io.cloudsmith.rabbitmq.E495BB49CC4BBE5B.gpg] https://dl.cloudsmith.io/public/rabbitmq/rabbitmq-erlang/deb/ubuntu bionic main
deb-src [signed-by=/usr/share/keyrings/io.cloudsmith.rabbitmq.E495BB49CC4BBE5B.gpg] https://dl.cloudsmith.io/public/rabbitmq/rabbitmq-erlang/deb/ubuntu bionic main
## Provides RabbitMQ
##
deb [signed-by=/usr/share/keyrings/io.cloudsmith.rabbitmq.9F4587F226208342.gpg] https://dl.cloudsmith.io/public/rabbitmq/rabbitmq-server/deb/ubuntu bionic main
deb-src [signed-by=/usr/share/keyrings/io.cloudsmith.rabbitmq.9F4587F226208342.gpg] https://dl.cloudsmith.io/public/rabbitmq/rabbitmq-server/deb/ubuntu bionic main
EOF
## Update package indices
sudo apt-get update -y
## Install Erlang packages
sudo apt-get install -y erlang-base \
erlang-asn1 erlang-crypto erlang-eldap erlang-ftp erlang-inets \
erlang-mnesia erlang-os-mon erlang-parsetools erlang-public-key \
erlang-runtime-tools erlang-snmp erlang-ssl \
erlang-syntax-tools erlang-tftp erlang-tools erlang-xmerl
## Install rabbitmq-server and its dependencies
sudo apt-get install rabbitmq-server -y --fix-missing
build_docker.sh
#!/bin/bash
s_DOCKER_IMAGE_NAME="rabbitmq"
echo "We will build the Docker Image and name it: ${s_DOCKER_IMAGE_NAME}"
echo "After, we will be able to run a Docker Container based on it."
printf "Removing old image %s\n" "${s_DOCKER_IMAGE_NAME}"
sudo docker rm "${s_DOCKER_IMAGE_NAME}"
printf "Creating Docker Image %s\n" "${s_DOCKER_IMAGE_NAME}"
sudo docker build -t ${s_DOCKER_IMAGE_NAME} . --no-cache
i_EXIT_CODE=$?
if [ $i_EXIT_CODE -ne 0 ]; then
printf "Error. Exit code %s\n" ${i_EXIT_CODE}
exit
fi
echo "Ready to run ${s_DOCKER_IMAGE_NAME} Docker Container"
echo "To run in type: sudo docker run -it --name ${s_DOCKER_IMAGE_NAME} ${s_DOCKER_IMAGE_NAME}"
echo "or just use run_in_docker.sh"
requirements.txt
pika
loop_send_get_messages.sh
#!/bin/bash
echo "Starting RabbitMQ"
service rabbitmq-server start
echo "Launching consumer in background which will be listening and executing the callback function"
python3 rabbitmq_getfrom.py &
while true; do
i_MESSAGES=$(( RANDOM % 10 ))
echo "Sending $i_MESSAGES messages"
for i_MESSAGE in $(seq 1 $i_MESSAGES); do
python3 rabbitmq_sendto.py
done
echo "Sleeping 5 seconds"
sleep 5
done
echo "Exiting loop"
FROM ubuntu:20.04
MAINTAINER Carles Mateo
ARG DEBIAN_FRONTEND=noninteractive
RUN apt update && \
apt install -y vim python3-pip && \
apt install -y net-tools mc vim htop less strace zip gzip lynx && \
apt install -y apache2 mysql-server ntpdate libapache2-mod-php7.4 mysql-server php7.4-mysql php-dev libmcrypt-dev php-pear && \
apt install -y git && apt autoremove && apt clean && \
pip3 install pytest
RUN a2enmod rewrite
RUN echo "Europe/Ireland" | tee /etc/timezone
ENV APACHE_RUN_USER www-data
ENV APACHE_RUN_GROUP www-data
ENV APACHE_LOG_DIR /var/log/apache2
ENV APACHE_PID_FILE /var/run/apache2/apache2.pid
ENV APACHE_RUN_DIR /var/run/apache2
ENV APACHE_LOCK_DIR /var/lock/apache2
ENV APACHE_LOG_DIR /var/log/apache2
COPY phpinfo.php /var/www/html/
RUN service apache2 restart
EXPOSE 80
CMD ["/usr/sbin/apache2", "-D", "FOREGROUND"]
File: phpinfo.php
<html>
<?php
// Show all information, defaults to INFO_ALL
phpinfo();
// Show just the module information.
// phpinfo(8) yields identical results.
phpinfo(INFO_MODULES);
?>
</html>
File: build_docker.sh
#!/bin/bash
s_DOCKER_IMAGE_NAME="lampp"
echo "We will build the Docker Image and name it: ${s_DOCKER_IMAGE_NAME}"
echo "After, we will be able to run a Docker Container based on it."
printf "Removing old image %s\n" "${s_DOCKER_IMAGE_NAME}"
sudo docker rm "${s_DOCKER_IMAGE_NAME}"
printf "Creating Docker Image %s\n" "${s_DOCKER_IMAGE_NAME}"
# sudo docker build -t ${s_DOCKER_IMAGE_NAME} . --no-cache
sudo docker build -t ${s_DOCKER_IMAGE_NAME} .
i_EXIT_CODE=$?
if [ $i_EXIT_CODE -ne 0 ]; then
printf "Error. Exit code %s\n" ${i_EXIT_CODE}
exit
fi
echo "Ready to run ${s_DOCKER_IMAGE_NAME} Docker Container"
echo "To run in type: sudo docker run -p 80:80 --name ${s_DOCKER_IMAGE_NAME} ${s_DOCKER_IMAGE_NAME}"
echo "or just use run_in_docker.sh"
echo
echo "If you want to debug do:"
echo "docker exec -i -t ${s_DOCKER_IMAGE_NAME} /bin/bash"
As in my case my jenkins container Id is 77b6a5a7ae8d in order to know the jenkins administrator password I check the logs for my jenkins Container with docker logs 77b6a5a7ae8d:
docker logs 77b6a5a7ae8d
Running from: /usr/share/jenkins/jenkins.war
webroot: EnvVars.masterEnvVars.get("JENKINS_HOME")
2022-06-26 21:02:05.492+0000 [id=1] INFO org.eclipse.jetty.util.log.Log#initialized: Logging initialized @549ms to org.eclipse.jetty.util.log.JavaUtilLog
2022-06-26 21:02:05.583+0000 [id=1] INFO winstone.Logger#logInternal: Beginning extraction from war file
2022-06-26 21:02:05.613+0000 [id=1] WARNING o.e.j.s.handler.ContextHandler#setContextPath: Empty contextPath
2022-06-26 21:02:05.674+0000 [id=1] INFO org.eclipse.jetty.server.Server#doStart: jetty-9.4.45.v20220203; built: 2022-02-03T09:14:34.105Z; git: 4a0c91c0be53805e3fcffdcdcc9587d5301863db; jvm 11.0.15+10
2022-06-26 21:02:05.986+0000 [id=1] INFO o.e.j.w.StandardDescriptorProcessor#visitServlet: NO JSP Support for /, did not find org.eclipse.jetty.jsp.JettyJspServlet
2022-06-26 21:02:06.020+0000 [id=1] INFO o.e.j.s.s.DefaultSessionIdManager#doStart: DefaultSessionIdManager workerName=node0
2022-06-26 21:02:06.020+0000 [id=1] INFO o.e.j.s.s.DefaultSessionIdManager#doStart: No SessionScavenger set, using defaults
2022-06-26 21:02:06.021+0000 [id=1] INFO o.e.j.server.session.HouseKeeper#startScavenging: node0 Scavenging every 600000ms
2022-06-26 21:02:06.463+0000 [id=1] INFO hudson.WebAppMain#contextInitialized: Jenkins home directory: /var/jenkins_home found at: EnvVars.masterEnvVars.get("JENKINS_HOME")
2022-06-26 21:02:06.647+0000 [id=1] INFO o.e.j.s.handler.ContextHandler#doStart: Started w.@7cf7aee{Jenkins v2.346.1,/,file:///var/jenkins_home/war/,AVAILABLE}{/var/jenkins_home/war}
2022-06-26 21:02:06.668+0000 [id=1] INFO o.e.j.server.AbstractConnector#doStart: Started ServerConnector@4c402120{HTTP/1.1, (http/1.1)}{0.0.0.0:8080}
2022-06-26 21:02:06.669+0000 [id=1] INFO org.eclipse.jetty.server.Server#doStart: Started @1727ms
2022-06-26 21:02:06.669+0000 [id=25] INFO winstone.Logger#logInternal: Winstone Servlet Engine running: controlPort=disabled
2022-06-26 21:02:06.925+0000 [id=32] INFO jenkins.InitReactorRunner$1#onAttained: Started initialization
2022-06-26 21:02:07.214+0000 [id=39] INFO jenkins.InitReactorRunner$1#onAttained: Listed all plugins
2022-06-26 21:02:10.781+0000 [id=47] INFO jenkins.InitReactorRunner$1#onAttained: Prepared all plugins
2022-06-26 21:02:10.794+0000 [id=35] INFO jenkins.InitReactorRunner$1#onAttained: Started all plugins
2022-06-26 21:02:10.803+0000 [id=42] INFO jenkins.InitReactorRunner$1#onAttained: Augmented all extensions
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.codehaus.groovy.vmplugin.v7.Java7$1 (file:/var/jenkins_home/war/WEB-INF/lib/groovy-all-2.4.21.jar) to constructor java.lang.invoke.MethodHandles$Lookup(java.lang.Class,int)
WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.vmplugin.v7.Java7$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
2022-06-26 21:02:11.634+0000 [id=30] INFO jenkins.InitReactorRunner$1#onAttained: System config loaded
2022-06-26 21:02:11.635+0000 [id=30] INFO jenkins.InitReactorRunner$1#onAttained: System config adapted
2022-06-26 21:02:11.642+0000 [id=48] INFO jenkins.InitReactorRunner$1#onAttained: Loaded all jobs
2022-06-26 21:02:11.645+0000 [id=46] INFO jenkins.InitReactorRunner$1#onAttained: Configuration for all jobs updated
2022-06-26 21:02:11.668+0000 [id=67] INFO hudson.model.AsyncPeriodicWork#lambda$doRun$1: Started Download metadata
2022-06-26 21:02:11.675+0000 [id=67] INFO hudson.model.AsyncPeriodicWork#lambda$doRun$1: Finished Download metadata. 4 ms
2022-06-26 21:02:11.733+0000 [id=52] INFO jenkins.install.SetupWizard#init:
*************************************************************
*************************************************************
*************************************************************
Jenkins initial setup is required. An admin user has been created and a password generated.
Please use the following password to proceed to installation:
3de0910b83894b9294989552e6fa9773
This may also be found at: /var/jenkins_home/secrets/initialAdminPassword
*************************************************************
*************************************************************
*************************************************************
2022-06-26 21:02:22.901+0000 [id=52] INFO jenkins.InitReactorRunner$1#onAttained: Completed initialization
2022-06-26 21:02:23.013+0000 [id=24] INFO hudson.lifecycle.Lifecycle#onReady: Jenkins is fully up and running
In my case the password is at the bottom, between the stars: 3de0910b83894b9294989552e6fa9773
The change of license of Docker Desktop for Windows has been a low punch, a dirty one.
Many big companies use Windows as for the laptops and workstations, we like it or not.
You can setup a Linux development computer or Virtual Machine, you may argue, but things are not as easier.
Big companies have Software licenses assigned to corporation machines, so you may not use your Pycharm license in a Linux VM.
You may no use Docker Desktop either, if your company did not license it.
And finally you may need to have access to internal resources, like Artifactory, or Servers where access is granted via ACL, so only you, from your Development machine can access it. So you have to be able to run Docker locally.
After Docker introduced this changed of license I was using VirtualBox with NAT attached to the VPN Virtual Ethernet, and I port forwarded to be able to SSH, deploy, test, etc… from outside to my Linux VM, and it was working for a while, until with the last VirtualBox update and some Windows updates where pushed to my Windows box and my VirtualBox VMs stopped booting most of the times and having random problems.
I configured a new Linux VM in a Development Server, and I opened Docker API so my Pycharm’s workstation was able to deploy there and I was able to test. But the Dev Ip’s do not have access to the same Test Servers I need my Python Automation projects to reach (and quickly I used 50 GB of space), so I tried WSL. I like Pycharm I didn’t want to switch to VStudio Code because of their good Docker extensions, in any case I could not run my code locally with venv cause some of the packages where not available for Windows, so I needed Linux to run the Unit Testing and see the Code Coverage, run the code, etc…
I tried Hyper-V, tried with NAT External, but it was incompatible with my VPN.
Note: WSL can be used, but I wanted to use Docker Engine, not docker in WSL.
Installing Docker Command line binaries
The first thing I checked was the Docker downloads page.
It has been 9 years since I created the blog, and some articles have old content that still get many visitors. To make sure they get the clear picture and not obsolete information, all the articles of the taxonomy POST, will include the Date and Time when the article was first published.
I also removed the annoying link “Leave a comment” on top. I think it influences some people to leave comments before actually having read the article.
It is still possible to add comments, but they are on the bottom of the page. I believe it makes more sense this way. This is the way.
Technically that involved modifying the files of my template:
functions.php
content.php
My Books
Automating and Provisioning to Amazon AWS using boto3 Amazon’s SDK for Python 3
It’s 128 pages in Full size DIN-A4 DRM-Free, and comes with a link to code samples of a real project CLI Menu based.
Docker Combat Guide
I have updated my book Docker Combat Guide and I added a completely new section, including source code, to work with Docker’s Python SDK.
I show the Docker SDK by showing the code of an actual CLI program I wrote in Python 3.
Here you can see a video that demonstrates how I launched a project with three Docker Containers via Docker compose. The Containers have Python, Flask webserver, and redis as bridge between the two Python Containers.
All the source code are downloadable with the book.
Watch at 1080p at Full Screen for better experience
My Classes
In January I resumed the coding classes. I have new students, and few spots free in my agenda, as some of my students graduated and others have been hired as Software Developers. I can not be more proud. :)
Free Training
Symfony is one of the most popular PHP Frameworks.
Before leaving 2021, I registered WinRAR for Windows.
WinRAR is a compressing Software that has been with us for 19 years.
I’m pretty sure I registered it in the past, but these holidays I was out only with two Window laptops and I had to do some work for the university and WinRAR came it handy, so I decided to register it again.
I create Software and Books, and I earn my life with this, so it makes a lot of sense to pay others for their good work crafting Software.
Books I Purchased
I bought this book and by the moment is really good. I wanted to buy some updated books as all my Linux books have some years already. Also I keep my skills sharp by reading reading reading.
Hardware I purchased
So I bought a cheap car power inverter.
The ones I saw in Amazon were €120+ and they were not very good rated, so I opted to buy a cheap one in the supermarket and keep it on the car just in case one day I need it. (My new Asus Zenbook laptop has 18 hours of autonomy and I don’t charge it for days, but you never know)
For those that don’t know, a power inverter allows you to get a 220V (120V in US) plug, from the connection of the lighter from your car. Also you can get the energy from an external car battery. This comes in really handy to charge the laptop, cameras, your drone… if you are in the nature and you don’t have any plug near.
I bought one years ago to power up Raspberry Pi’s when I was doing Research for a project I was studying to launch.
Fun
Many friends are using Starlink as a substitute of fiber for their rural homes, and they are super happy with it.
One of them send me a very fun article.
It is in Italian, but you can google translate it.
Anyways you can get the idea of what’s going on in the picture :)
So tell me… so your speed with Starlink drops 80% in winter uh… aha…
Random news about Software
I tried the voice recognition in Slack huddle, and it works pretty well. Also Zoom has this feature and they are great. Specially when you are in a group call, or in a class.
My health
I was experimenting some problems, so I scheduled an appointment to get blood analysis and to be checked. Just in case.
TL;TR I could have died.
The doctors saw my analysis and sent me to the hospital urgently, where they found something that was going to be lethal. For hours they were checking me and doing several more analysis and tests to discard false positives, etc… and they precisely found the issue and provided urgent treatment and confirmed that I could have died at any moment.
Basically I dodged a bullet.
I was doing certain healthy things that helped me in a situation that could have been deadly or extremely dangerous to my health.
With the treatment and my strict discipline, I reverted the situation really quick and now I have more health and more energy than before. I feel rejuvenated.
I’m feeling lucky that with my work, the classes, the books I wrote, etc… I didn’t have to worry about the expensive medicines, the transport, etc… It was a bad moment, during Christmas, with so many people on holidays, pharmacies and GPs closed, so I had to spend more time looking for, traveling, and to pay more than it would had been strictly necessary. Despite all the time I used to my health, I managed to finish my university duties on time, and I didn’t miss my duties at work after the hospital, neither I had to cancel any programming classes or mentoring sessions. Nobody out of my closest circle knew what was going on, with the exception of my boss, which I kept informed in real time, just in case there was any problem, as I didn’t want to let down the company and have my duties at work to be unattended if something major happened.
I was not afraid to die. Unfortunately I’ve lost very significant people since I was a child. Relatives, very appreciated bosses and colleagues which I considered my friends, and great friends of different circles. Illnesses, accidents, and a friend of mine committed suicide years ago, and some of my partners attempted it (before we know each other). When you see people that are so good leaving, this brings a sadness that cannot be explained with words. I have had a tough life.
We have a limited time, and he have freedom to make choices. Some people choose to be miserable, to mistreat others, to lie, to cheat, to be unfaithful, to lack ethic and integrity. Those are their choices. Their wasted time will not come back.
Some of my friends are doctors. I admire them. They save lives and improve the quality of life of people with health problems.
I like being an Engineer cause I can create things, I can build instead of destroy, I can help to improve the world, and I can help users to have a good time and to avoid the frustration of services being down. I chose to do a positive work. So many times I’ve been offered much bigger salaries to do something I didn’t like, or by companies that I don’t admire, and I refused. Cause I wanted to make a better world. I know many people don’t think like that, and they only take take take. They are even unable to understand my choices, even to believe that I’m like that. But it’s enough that I know what I’m doing, and that it makes sense for me, and that I know that I’m doing well. And then, one day, you realize, that doing well, being fair and nice even if other people stabbed you in the back, you got to know fantastic people like you, and people that adore you and love to have you in their life, in their companies… So I’m really fortunate. To all the good-hearted people around, that give without expect anything in return, that try to make the world a better place, thank you.
Normally if we need to refresh a config in a Container we will spawn a new one, or we will access with sudo docker exec -it /bin/sh mycontainer for instance and force a reload, or we will have to restart the Container.
What if we want to be able to reload the config at any moment without restarting the process, or to trigger a process in our Container (like a dump or a flush) in another way than implementing an API?.
An unexplored way, for many, to communicate with your Container’s main process is to send Signals.
So basically I will show you how you can trap Signals within a Python process which is the main process for your Docker Container, and send them from your Hypervisor with the command:
sudo docker kill --signal=SIGUSR1
I choose to use SIGUSR1 as it is reserved for user defined Signals.
You can clone the project or get the source code from:
FROM ubuntu:20.04
MAINTAINER Carles Mateo
RUN apt update && apt install -y python3 python3-pip vim less && apt-get clean
# This will make sure printing in the Screen when running in dettached mode
ENV PYTHONUNBUFFERED=1
ENV DOCKERSIGNAL /var/dockersignal
RUN mkdir -p $DOCKERSIGNAL
COPY *.py $DOCKERSIGNAL
WORKDIR $DOCKERSIGNAL
# Again to enforce printing to the Screen when running dettached
CMD ["python3", "-u", "/var/dockersignal/dockersignal.py"]
The dockersignal.py file
# By Carles Mateo https://blog.carlesmateo.com
import signal
import time
def handler(signum, frame):
print('Signal handler called with signal', signum)
if signum == 10:
# 10 is the equivalent to SIGUSR1 for most x86/ARM (not for Alpha/Sparc, MIPS, PARISC)
print("Simulated action: Reload config")
if __name__ == "__main__":
print("Waiting for a Signal")
# Listed for this signal, so can listen for more
signal.signal(signal.SIGUSR1, handler)
while True:
# Do Whatever
time.sleep(1)
A shell file to build and run the Container like a pro
#!/bin/bash
DOCKER_CONTAINER_NAME="docker-signal"
DOCKER_IMAGE_NAME="docker-signal"
printf "Removing old Container %s\n" "${DOCKER_CONTAINER_NAME}"
sudo docker rm "${DOCKER_IMAGE_NAME}"
printf "Removing old Image %s\n" "${DOCKER_IMAGE_NAME}"
sudo docker image rm "${DOCKER_IMAGE_NAME}"
echo "Creating Docker Image"
sudo docker build -t ${DOCKER_IMAGE_NAME} . --no-cache
retVal=$?
if [ $retVal -ne 0 ]; then
printf "Error. Exit code %s\n" ${retVal}
exit
fi
echo "Running Docker Container ${DOCKER_CONTAINER_NAME} based in image ${DOCKER_IMAGE_NAME}"
sudo docker run --cpus="1.0" --name ${DOCKER_CONTAINER_NAME} ${DOCKER_IMAGE_NAME}
I’ve raised back the price for my books to normal levels. I’ve been keeping the price to the minimum to help people that wanted to learn during covid-19. I consider that who wanted to learn has already done it.
I still have bundles with a somewhat reduced price, and I authorized LeanPub platform to do discounts up to 50% at their discretion.
