umount /home device is busy
I wanted to unmount /home drive on a server. If any program is accessing the drive, you won’t be able to unmount…
Linux
Run a script on boot using systemd on Ubuntu 18.04
Previous versions of Ubuntu had /etc/rc.local. that get executed after system boot. On Ubuntu 18.04, you can use systemd to start a…
Find all live hosts on your network
nmap can be used to get list of all devices on your network. To scan IP range 192.168.1.1 to 192.168.1.255, run nmap…
Logging Modem logs to remote rsyslog server
My FTTH ONU have remote logging option, this allowes me to log to a remote server running rsyslog. On model, i set…
Install AnyDesk on Ubuntu using flatpak
AnyDesk is a remote desktop sharing application like TeamViewer and Google Remote Desktop. I normally use Google Chrome Remote desk as it…
Adding Backup Disk on a Linux Server
It is better to have a second hard disk on servers for backup. Here, we will partition a fresh disk, format and…
Debian 8 jessie repo error
On a Debian 8 server, when running apt update, got following error W: Failed to fetch http://mirror.com/debian/dists/jessie/main/source/Sources 404 Not Found [IP: 185.194.238.133…
Linux User Account
Linux How to Disable a user account useradd usermod Adding a group in Linux with addgroup Linux groups
Linux How to Disable a user account
To disable or lock a linux user account, run passwd -l USERNAME_HERE Or usermod -L USERNAME_HERE To verify if a user is…
Install LetsEncrypt SSL on Gitlab
To enable LetsEncrypt free SSL on Gitlab, edit file vi /etc/gitlab/gitlab.rb Modify following configrations letsencrypt[‘enable’] = true external_url “https://gitlab.example.com” letsencrypt[‘contact_emails’] = [‘foo@email.com’]…