Introduction A list of solutions for common problems working in a bash shell. Will update as I find them. Find two words existing on the same line https://stackoverflow.com/questions/6480687/grep-for-2-words-existing-on-the-same-line To grep for 2 words existing on the same line, simply do:
Configuring Multiple Default Routes Linux
Introduction No real need to explain the problem too in depth. A Linux machine with multiple interfaces accepts a packet on one interface but sends the reply out of another. Not going to work in the bulk of situations. Solution
OSPFv3 Authentication Palo Alto to Cisco Router
Introduction OSPFv3 authentication is quite generally quite straightforward to configure between two Cisco devices. There are some great posts regarding this topic, in fact one of the best I’ve read is by the great Jeremy Stretch. http://packetlife.net/blog/2008/sep/3/ospfv3-authentication/ The issue I
Expanding Linux Raid ESXi
Introduction A nice brief post here. This is the operation required to increase disk size when using Linux RAID e.g. mdadm on an underlying ESXi host. Steps Increase the size of the VMDK files within ESXi Simply edit the size
Palo Alto Dual WAN branch office to Netscreen HQ
Introduction The deployment of dual WAN firewall solutions in branch offices is often required to ensure fail-over for unreliable WAN connections. This type of deployment however can add additional complexity compared to a full BGP setup using capable routers. With
DNS Based Challenge Verification SSL Certificates
Introduction Letsencrypt offer free SSL certs but the one caveat is they have a short 90 day expiry. There is the option to setup automatic renewal using file based verification if the web server is accessible publicly, however if you need
Linux Bash Printing Columns using AWK
Introduction If you ever had a requirement to parse huge firewall logs looking for something specific then trust me you will likely need to use awk possibly in combination with other commands such as grep, sort and uniq. Solution Get
VMware ESXi 5.5 – Hardware Health Status shows “Unknown”
Introduction If you ever find that the sensors on your ESXi server show an Unknown status. You may think a reboot is your only option to get it functioning again however not true. Solution If you SSH to the system
Saving a read-only file edited in vi / vim
Introduction A simple but annoying one. You open a configuration file with no intent to change anything, then you think I’ll just change that .. and this.. and 20 minutes later when you go to save you realise you opened
Juniper Netscreen Track IP
Introduction IP tracking can be used to change routing based on the connectivity of configured IP addresses. This can be used with either default routes or static routes which in normal circumstances would not change in the event of reachability