Just my blog

Blog about everything, mostly about tech stuff I made. Here is the list of stuff I'm using at my blog. Feel free to ask me about implementations.

Soft I recommend
Py lib I recommend

I'm using these libraries so you can ask me about them.

Raspberry 5 test-to-speech using Piper

How to make your Raspberry 5 talking with python lib Piper?

I wanted to make my Raspberry tell me about power outages and air alerts near my location.

The setup is pretty simple and described ar the repo:

I didn't want to waste my time making yet another Python venv and that's why I've chosen a simple binary mode.


Now about the setup:

  • Raspberry 5.
  • USB sound card with 3.5 jack.
  • USB-powered speaker with a 3.5 jack.


CMD to change the volume programmatically:

amixer set Master 80% >> /dev/null

 Sound devices and controls

You may have a problem with playing generated WAV files and making voice directly. So you need to choose devices for a different output.

To list devices run:

# List devices
aplay -L
# I only have USB card:
     USB Audio, USB Audio
    Direct hardware device without any conversions
     USB Audio, USB Audio
    Hardware device with all software conversions
     USB Audio, …


Installing NUT - Network Ups Tool Notifications and emails

Installing NUT - Network Ups Tool Notifications and emails

Notifications and email

Just a simple work log of installing NUT and configuring email notifications from it.



 Go to file:

sudo vi /etc/nut/upsmon.conf
Add at the EOF:
# Email script for NOTIFYCMD
# Simple
NOTIFYCMD "/etc/nut/notifycmd.sh"

# Notification events


Simple notification script


sudo vi /etc/nut/notifycmd.sh


echo -e "Subject: UPS ALERT Basic: $NOTIFYTYPE\n\nUPS: $UPSNAME\r\nAlert type: $NOTIFYTYPE\n\n\nThis is a basic notification!" | msmtp $EMAIL
Exec rights
# Change group to nut
sudo chown :nut /etc/nut/notifycmd.sh
# Add execution
sudo chmod 774 /etc/nut/notifycmd.sh
# Restart the NUT services
sudo systemctl restart nut-server.service
sudo systemctl restart nut-driver.service
sudo systemctl restart nut-monitor.service

Extra notification script by Scheduler


Installing NUT - Network Ups Tool

Install and use Network Ups Tool - an open source Uninterruptible Power Supply software

I'll describe a full path on how to install and use NUT.
My implementation is using Raspberry Pi 5 and a TP-Link router attached to 800W UPS.
RPi will be a brain unit which will send notifications to email and make a voice notification about power outages and battery levels.
My current surge and power loss protection scheme is the following:
  • UPS with connected devices:
    • LG TV
    • Soundbar
    • NUC as a media centre (with NUT monitor for Windows)
    • RPi5 as brain unit with NUT, Pi-Hole and DHCP.
    • TP-Link Router.

In case of a power-loss event, PRi will notify me via email, NUC will power off on its own, TV can be powered off manually.

Powered-off TV and soundbar are neglectable in total power usage on battery, so I have about 1,5 to 2 hours of running Raspberry 5 and TP-Link to keep my internet on.

Now to the setup. …


Centos Python Installation Guide with no Pain

Old me installing Python

Centos 7 + Python 3(4,5,6,7,8) installation guide with no pain. As for me.


I can't even say how many times I have to update my python executables for web servers and how much pain I feel during this routine.


Usual Google\StackOverflow advice only describes one particular problem. But there're few of them, and they're different so you spent hours trying to collect them all and pick the right decision.


Then you just drop it and use yum for any latest python version available!


Here I'll show you and make a reminder for myself about how to install modern python in the best way, once, without pain.


I use Centos 7 typical install as for WebServer (minimal install could require to install tonnes of dev-libs and yum, be sure you prepared them before)


1. Preparations:


You need to install some compil libs.


yum …


Test design and implementation.

Old stuff, very old


Very beginning


Test design


Our test system has a pretty simple configuration, so I do not want to bother you with the detailed description of it. Simply - it's just a standalone execution of a test.py file with all requirements (test setup and tear down) in local internal test utility. Helper local utility has a usual amount of preparation functions, test data loading and some other configurations. In the very end of test loading, it just compares a node-set result of "real" scan (software and hardware nodes in a database after the scan) with predefined node-set (from test.py). Node set we usually expect at the end of the test should be added by the developer when product discovery pattern is ready or have a new feature or fix.


Now I'm trying to implement entirely new and somewhere different test design because current is not …


Test automation or: How I Learned to Stop Worrying and Love Async __init__

Old stuff

Morning everybody…


I recommend reading this part of the blog only in the morning with a cup of dark and strong coffee.


I'll show you some new cases, and howto's to help you automate routines in the developer's life. There will be an example of my fails and win on different scenarios. The poor code I'll include also.


Very beginning


Firstly - I'll try to make this thread in English. And maybe later when I have time - to make Ukrainian and Russian translations, I'll make them.


"Octopus" story has started from a small plugin for Sublime Text editor. Later it will be ported to Atom.


I've started developing "Octopus" on spring-summer 2016, and I've not finished it yet! New functions and features were implemented continuously. Product transforms into a framework.


Now all processes executed automatically and simultaneously for 24/7.  "Octopus" has …


Oh my gosh BACULA config

Recently finished bacula config and run first one successfully! I'm really do not understand now, why does this tool have a complicated system with batch of daemons and modules. For my opinion, backup tool just should know from where to wherever make a backup and how often. But for further usage and remember this config, I'll add it here. [caption id="" align="alignnone" width="428"]Bacula config Bacula config[/caption]   Is is just a reminder, not a how-to, just want to not forget this. Job configs is not so complicate, intuitively understandable.



[su_spoiler title="Code" icon="chevron"]

Director {                            # define myself
  Name = tet-redmine-dir
  DIRport = 9101
  QueryFile = "/etc/bacula/scripts/query.sql"
  WorkingDirectory = /var/lib/bacula
  PidDirectory = "/var/run/bacula"
  Maximum Concurrent Jobs = 1
  Password = "tet-redmine-director"         # Console password
  Messages = Daemon
  DirAddress =
Storage {
  Name = File
# Do not use "localhost" here
  Address =
  SDPort = 9103
  Password = tet-redmine-storage
  Device …


Install Bacula on debian systems

Failed to load the database DBI driver SQLite at ./bacula-backup-lib.pl line 45 Based on:

The main problem was:

Failed to load the database DBI driver SQLite at ./bacula-backup-lib.pl line 45

this ultra fast fix can help:

apt-get install libdbd-sqlite3-perl

You can install any needed module based on SQL you use: MySQL, PostrgeSQL etc.


python script as centos service

Task completed!py_vk I made a vkontakte Bot which delete all comments are not from group members! But I do not want to run it by cron, because it will SPAM all my system with cron emails. But I found resolution:

  • make a worker.py
  • allow worker to run delete scripts on time periods
  • add worker as centos service
  • have fun!

Maybe later I'll add more code, but now just for example I'll show only worker and bash script:

# coding=utf-8

from time import strftime, sleep
import schedule
from vk_del_comments import *
from vk_del_comments_older import *
import os

pid = os.getpid()
op = open("/var/us.pid","w")
op.write("%s" % pid)

token = ''
tk_owner_id = "-000000000"
tk_group_id = "000000000"
tk_domain = "group_domain"

curr_date = strftime("%d-%m-%Y - %H:%M:%S")
logFile = 'comments_deleter_log.txt'

# print("Start Comments Bot Worker!")

def del_comments_30_sec():
    del_comments_regular(logFile, token, tk_owner_id, tk_group_id, tk_domain)

def del_comments_5_min():
    delete_comments_older(logFile, token, tk_owner_id, tk_group_id, tk_domain)

# schedule.every(30).seconds.do(del_regular_comments_19)

while …


Allow Apache run python scripts

This is a simple ex. to allow apache run .py

# Python site at /var/www/py_site

LoadModule wsgi_module /usr/lib64/httpd/modules/mod_wsgi.so

<VirtualHost *:80>
 ServerName test.www.trianglesis.org.ua
 ServerAlias www.www.trianglesis.org.ua
 ServerAdmin test@test.com
 DocumentRoot /var/www/py_site/

 <Directory /var/www/py_site>
 Order allow,deny
 Require all granted
 Allow from all

 <Directory /var/www/py_site/cgi-bin>
 Options +ExecCGI
 Require all granted
 Allow from all
 Options +ExecCGI
 AddHandler cgi-script .cgi .pl .py
 AddHandler cgi-script .py