How to view .HEIC image thumbnails in Void Linux thunar/nautilus/pcmanfm…file managers

Published: July 30, 2022 / Updated: July 30, 2022 Akhil Jalagam Howto, Linux

Install these packages and restart file manager

sudo xbps-install libheif libheif-tools

Note: HEIC thumbnails in pcmanfm didn’t work for me.

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How to add bulk IP addresses to DigitalOcean firewall ?

Published: July 15, 2020 / Updated: January 11, 2021 Akhil Jalagam Beginners, Cloud Computing, DevOps, Howto, Linux, Networking
digitalocean

Trying to add bulk IP’s in DigitalOcean firewall? You are in the right place.

DigitalOcean cloud control panel UI doesn’t allow you to paste in multiple IP Addresses at once. That’s a good idea for a UI improvement.

In the meantime you can definitely do it via the API…… Read more

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How to renew the SSL certificates for dovecot and postfix

Published: April 10, 2020 / Updated: April 10, 2020 Akhil Jalagam Beginners, DevOps, Howto, Linux, Security

Make a backup of the existing SSL key and certificate file

cd /etc/pki/dovecot
cp -a certs/dovecot.pem certs/dovecot.pem.old
cp -a private/dovecot.pem private/dovecot.pem.old

Create the new SSL certificate for two years:

openssl genrsa -out private/dovecot.pem 1024
openssl req -new -x509 -key private/dovecot.pem -out certs/dovecot.pem -days 730

Restart Dovecot and Postfix

sudo systemctl
… Read more

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How to display brightness level in i3status bar

Published: November 26, 2019 / Updated: July 21, 2021 Akhil Jalagam Beginners, Howto, Linux

I’ve been using Linux for a long time, but I was never entirely happy with the desktop environment options available. Until last year, Xfce was the closest to what I consider a good compromise between features and performance. Then I found i3, an amazing piece of software that changed … Read more

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Still Confused With Mail Ports?

Published: October 26, 2019 / Updated: April 20, 2020 Akhil Jalagam DevOps, Linux, Networking

This article explains the most commonly used Email protocols on the internet – POP3, IMAP, and SMTP

  • SMTP 25, 2525
  • SMTP-SSL/TLS 587,465
  • IMAP 143
  • IMAP-SSL/TLS 993
  • POP3 110
  • POP3-SSL/TLS 995

587 vs. 465
These port assignments are specified by the Internet Assigned Numbers Authority (IANA):

Port 587: [SMTP] Message … Read more

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How to install the latest git from source

Published: October 25, 2019 / Updated: April 20, 2020 Akhil Jalagam DevOps, Howto, Linux

git-install-latest-from-src.sh

wget https://github.com/git/git/archive/master.zip
unzip master.zip && rm master.zip
cd master
make configure
./configure --prefix=/usr
make install

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How to install PHP 7.1/7.2/7.3/7.4 in CentOS 7

Published: October 20, 2019 / Updated: April 20, 2020 Akhil Jalagam Beginners, DevOps, Howto, Linux, Web Server

Uncomment the required php version.

yum install -y http://rpms.remirepo.net/enterprise/remi-release-7.rpm
yum install -y yum-utils
# yum-config-manager --enable remi-php70
# yum-config-manager --enable remi-php71
# yum-config-manager --enable remi-php72
yum-config-manager --enable remi-php73
yum -y install php # php-mcrypt php-cli php-gd php-curl php-mysql php-ldap php-zip php-fileinfo 
php -v

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How to auto login in PostgreSQL from a shell?

Published: October 18, 2019 / Updated: July 15, 2021 Akhil Jalagam Beginners, Database, DevOps, Howto, Linux

When you run MySQL commands MySQL, mysqlcheck, mysqdump and psql, psqldump etc; they will pick username & password from this file if you do not provide them as argument (-u and -p). It can save you time.

Of course, if you specify username and password explicitly as part of the … Read more

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fail2ban filters – custom rules using regexp

Published: October 16, 2019 / Updated: July 21, 2021 Akhil Jalagam Beginners, DevOps, Howto, Linux, Networking, Security, Web Server
fail2ban

fail2Ban is a very handy tool to prevent a lot of unwanted traffic from consuming bandwidth on your servers. It’s a minimal and relatively simple IDS Type Tool that comes with some predefined filters to automatically lockout potentially dangerous or bandwidth-consuming type attacks.

1. creating a custom filter

/etc/fail2ban/filter.d/custom.conf
[Definition]
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