Centos – SSH fail /dev/null character device
issue: ssh daemon Fails to start on server trying to start the ssh service results: # /etc/init.d/sshd start Starting sshd: […]
Digital Black Hole /dev/null
root@anywhere: ~/void root@anywhere:~# ls -l /dev/null # crw-rw-rw- 1, 3 — a character device, not a file Digital Black Hole […]
SolusVM – OPenVZ containers
Kill an OpenVZ Container – e.g id 900 vzctl stop 900 Use –fast switch to kill the OpenVZ Container – […]
ESXi Firewall Commands – ESXi Shell
You can configure the ESXi firewall at the command line. Firewall Configuration Using the ESXi Shell The vSphere Web Client […]
How to Expand a VM Disk and Grow the Filesystem on RHEL 9 / AlmaLinux (Online, No Reboot)
Updated for 2026: originally written for RHEL 7 on vSphere. The dance hasn’t changed — grow the virtual disk, make […]
NMAP – scan for unused or down IP’s
nmap -v sn -n 192.168.3.0/23 -oG – | awk ‘/Status: Down/{print $2}’ -sn (No port scan) . This option tells […]