How do you continuously watch / monitor a Linux command?
Sometimes you want to continuously observe a Linux command. Instead of up arrow and enter the whole time, try this: watch -n 1 “systemctl is-active
Operating Systems
How to update the hostname on a Debian system
Try this command first too change your hostname: hostnamectl set-hostname newhostname Exit the terminal, and come back in. If that doesn’t work, also check the
ssh_dispatch_run_fatal: Connection to x.x.x.x port 22: DH GEX group out of range
You’re trying to SSH to a Zyxel switch and get the following message: user@hostname ~ $ ssh [email protected] -p 22 ssh_dispatch_run_fatal: Connection to x.x.x.x port
How to get a script to automatically start on startup on a Debian Linux System
Problem: After your system has started, you need a script to run always. Solution: On a typical Linux system you can simply created an /etc/rc.local
How to see what’s running on a port in Linux
user@hostname ~ $ sudo lsof -i -P -n | grep LISTEN | grep 1025 mailcatch 1104 root 9u IPv4 27240 0t0
How to set up a fault tolerant / failover system on Linux
Problem: You need to make sure that your disks are 100% redundant. Solution: A popular way on Linux to do this is DRBD. Here are
Two good configuration files for DRBD and OCFS2
Problem: You need to know if your DRBD and OCFS2 disk fault tolerance has been setup correctly but the configuration options are overwhelming. Solution: See
How to use SCP to quickly copy files from one server to another
Issue: You want to copy files from your local computer to a remote server. On the remote server you don’t have root access. Or maybe
How to configure Debian source.list for automatic download of Debian Packages
Issue: You’ve installed Debian but during the installation you didn’t specify a good DNS server, or Debian didn’t pick up any of the sources you
How to check what version of Linux Mint you are running
To see which version of Linux Mint you are using, issue the following command: user@host ~ $ cat /etc/issue Linux Mint 19.1 Tessa \n \l