How to disable a rule in ModSecurity Apache
To disable a rule in ModSecurity, edit Apache configuration, add This needed to be added after all rules were loaded. On Ubuntu,…
Linux
access denied: tty ‘tty1’ is not secure
On a CentOS 7 server, when login as user root on the console, login fails. If I log in as a normal…
How to install cwebp on CentOS 7
cwebp is a command line program used to convert images into webp format. To install cwebp on CentOS 7, run WebP is…
How to reset CentOS 7 root password using console
If you have lost the root password of your CentOS 7 system and have access to the console directly or using KVM,…
How to change home directory of a linux user
You can modify a user’s home directory using usermod command in Linux. The syntax for the usermod command is sudo usermod -d…
How to Auto Restart ElasticSearh service on failure
If ElasticSearh service crash on your server, you can auto restart it by modifying systemd service file. systemctl edit elasticsearch This will…
Auto start Next.js with supervisor
I want to start Next.js development server on my computer when it starts. Usually, this is done using pm2, I wanted to…
Cron Job fails with Error Message “(getpwnam() failed): No such file or directory”
On a CentOS server, cronjob did not work. Checking the log file found the following error message in /var/log/cron Oct 24 18:35:01…
How to get list of User-Agent from access log
I wanted to block bots from accessing a website. For this, I need to generate a list of all browser User-Agent visiting…
How to reset root password on Hetzner Dedicated Server
If you forget the root password of a Hetzner dedicated server, you need to boot the server into rescue mode, then mount…
rsyslog Unsafe symlinks encountered in /var/log, refusing
When updating packages on an Ubuntu server, I got the error “Unsafe symlinks encountered in /var/log, refusing.”. root@ip-172-31-45-33:/var# apt upgrade -y Reading…
How to Split large CSV file into smaller files
To split a large CSV file into smaller parts, you can use the split command tail -n +2 access_log.csv | split -l…