Print Server is one of those things that makes life easier. I hooked up my Raspberry Pi and a Docker image in order to have a CUPS server and the Bonjour configuration. Login to the Raspberry Pi and switch to root (sudo -s or sudo su –) Check lsusb to see if you can see […]
Monthly Archives: April 2019
FirewallD
Fast commands for enabling firewalld on RHEL7 and CENTOS7. I had to enable these for a secondary control on a project I am on. Check the Status of the Firewall on Each Machine and confirm firewalld is started. systemctl status firewalld ● firewalld.service – firewalld – dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor […]
VirtualBox Additions missing
If you see Kernel Headers not found for target kernel level when installing the VBoxLinuxAdditions.run “Please install them and execute”. This issue was found on centos. You’ll see the commands below: yum install “kernel-devel-uname-r ==$(uname -r)” References https://unix.stackexchange.com/questions/232147/your-kernel-headers-for-kernel-3-10-0-229-el7-x86-64-cannot-be-found
Check Process File Handles
I needed to check process file handles efficiently and compare against the settings in /etc/limits.conf and /etc/limits.d db2inst1 13607 13605 0 Mar28 ? 02:47:56 db2sysc 0 Max open files 65534 65534 files 141db2inst1 13620 13605 0 Mar28 ? 00:00:00 db2vend (PD Vendor Process – 1) 0 Max open files 4096 4096 files 9db2inst1 13626 13605 […]