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
Operating Systems
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 avoid having to retype a password repeatedly using ssh-keygen and ssh-copy-id
You are tired of using SSH and having to repeatedly type passwords. This slowing down your workflow, especially as you are working on multiple servers.
How to maintain SSH terminal sessions using screen on an unreliable link
Background Broken SSH sessions can be a pain in the butt because it disrupts your workflow. Broken SSH sessions may be a result of: An
What is Virtualization?
KVM stands for Kernel-based Virtual Machine. It’s a type of virtualization technology that allows you to run multiple guests on a single hardware host. KVM