VLAN configuration is very different between HP and Cisco switches. HP is VLAN centred and Cisco is based on physical port. While managing Cisco switches, using a script to generate the config may ease the task. This post proposes a simple script to generate the config.
Continue reading “VLAN config generation with Ruby for Cisco Catalyst 3750”
Only two lines
time timezone 600 time daylight-time-rule user-defined begin-date 10/01 end-date 04/01
Continue reading “HP ProCurve Switch 5400zl timezone and daylight saving configuration in Sydney”
Only two lines
clock timezone AEST 10 clock summer-time AEDT recurring 1 Sun Oct 2:00 1 Sun Apr 3:00
Continue reading “Cisco ASA timezone and daylight saving configuration in Sydney”
Discount is a C implementation of Markdown, and Markdown a text-to-HTML converter written in Perl. They are pretty similar but different in the following behaviours
"" with “” and single and double quote ' with ’. Where Markdown will keep the single and double quote as-is.It is risky to issue a command like sudo dd if=image of=/dev/sdb bs=1M due to the risk of typing sdb to something else (e.g. internal drive). If an error has been made, the internal hard drive may get erased. This post proposes a solution by using udev rules, which will allow read/write access to USB drive without sudo and no password required. These udev rules does not affect SATA-based storage devices.
ThinkPad X280 running Ubuntu 18.04 allows a brightness level from 0 to 1515. However, the Fn+F5/F6 hotkey only allows 21 levels of control. This post provides a solution and easy-to-use script for brightness control, best use with Guake.
Continue reading “Precision brightness control on X280 running Ubuntu 18.04 (bionic)”There is an issue that X280 may wake up while it’s connected to the ThinkPad USB-C hub. Here is the workaround for this issue.
Continue reading “Prevent unwanted wake up for ThinkPad X280 running Ubuntu 18.04 (bionic)”Before purchasing ThinkPad X280, I was concerned about the CPU throttling bug. It’s a bug which will throttle the CPU performance once it’s been triggered and will not restore the performance without a reboot.
I’ve developed a Ruby script for this test, and run it on X280 with i5-8250U processor. I did not reproduce the throttling issue that requires a reboot to restore the performance – whether the machine is powered by battery or connected to the power supply. However, I did discover a symptom which will under-clock the process to 123MHz under the certain load.
Continue reading “ThinkPad X280 CPU load and throttling test on Ubuntu 18.04 (bionic)”
I’m an everyday Linux (Ubuntu) user moving from X201s to X280. This is my review after installing Ubuntu 18.04 (bionic) on X280.
Continue reading “Review for ThinkPad X280 running Ubuntu 18.04 (bionic)”I’ve followed the instructions from Bitnami for installing Let’s Encrypt certificate on Amazon Lightsail instance with Bitnami WordPress preloaded. The guide is very user-friendly and easy to follow. However, there is room for improvement in step 5 in certificate renewal.
Continue reading “Improved Let’s Encrypt certificate renewal on Bitnami WordPress”