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고준
Lives in Seoul, Korea
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Kernel boot parameters for grub and bootctl when using sd-encrypt mkinitcpio hook
In Archlinux, the initial ramdisk which contains kernel modules needed for booting the system is generated by a bash script named mkinitcpio . In /etc/mkinitcpio.conf  you specify which kernel modules you need at boot and then you build the initrd image (wh...
Kernel boot options for 'sd-encrypt' mkinitcpio hook which uses systemd: these options are different from those of the 'encrypt' mkinitcpio hook which uses busybox.
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How to create a mirror of the entire npm index including attachments using npm-fullfat-registry fullfat.js
In a previous post I attempted to create a local npm mirror by simply caching all packages I installed using npm install pkgname . Unfortunately, this approach is very slow, downloading only about 100 MB per hour. Considering that all the packages in npm ta...
How to create a local npm mirror of the entire index including attachments using npm-fullfat-registry and couchdb
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Notes on connecting to systems using a serial console cable
In my day job, I sometimes encounter ATCA hardware that doesn't have any external video ports. In these cases, I have to connect to the machine using a USB to RS232 serial console cable with DB9 connectors like the one pictured below: along with a DB9 to RJ...
In my day job, I sometimes encounter ATCA hardware that doesn't have any external video ports. In these cases, I have to connect to the machine using a USB to RS232 serial console cable with DB9 connectors like the one pictur...
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Slow transfer times when creating a local npm package mirror
In the current project I'm working on, the client wants developers to install packages from local mirrors of Ubuntu, PyPI, and npm. Creating local mirrors of Ubuntu default repositories is easy with apt-mirror , and PyPI can also be mirrored easily with Ban...
In the current project I'm working on, the client wants developers to install packages from local mirrors of Ubuntu, PyPI, and npm. Creating local mirrors of Ubuntu default repositories is easy with apt-mirror, and PyPI can a...
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Boot Information Negotiation Layer (BINL) UDP 4011 must be opened for PXE
I wrote a script that opens ports in the firewalld dynamic firewall so I can run a PXE server, but I neglected to add one port -- UDP 4011 for the Boot Information Negotiation Layer. Once the kernel and initrd are sent by TFTP, I use http to send installati...
I wrote a script that opens ports in the firewalld dynamic firewall so I can run a PXE server, but I neglected to add one port -- UDP 4011 for the Boot Information Negotiation Layer. Once the kernel and initrd are sent by TFT...
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Install Archlinux over UEFI PXE from an existing PXE server
When installing Linux over UEFI PXE, GRUB2 grub.cfg is used as the PXE image menu. Archlinux has some idiosyncratic PXE options which I will detail in this post. As of Oct. 2016, the Archlinux wiki has a sample Legacy BIOS PXE menu entry but this format can...
When installing Linux over UEFI PXE, GRUB2 grub.cfg is used as the PXE image menu. Archlinux has some idiosyncratic PXE options which I wi...
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Mirroring PyPI locally
I recently had to set up a local PyPI (Python Package Index) mirror at a client site so that developers could download pip packages locally instead of from the Internet. I used bandersnatch to mirror the packages hosted on PyPI. Bandersnatch can be installe...
How to create a local PyPI (Python Package Index) mirror and setup pip to use the local mirror instead of online repos.
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Using an external monitor with bumblebee and intel-virtual-output
I have an ASUS U36JC which uses both Intel integrated video and an Nvidia GeForce 310M GPU. On Windows, Nvidia has a solution called Optimus that will automatically switch between the Intel and Nvidia GPU's depending on the computing task. For example, when...
How to use an external monitor on a notebook video port hard-wired to an Nvidia card on Linux.
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Installing Nvidia driver for GeForce 310m on Fedora 24 with bumblebee-nvidia
My Asus U36JC notebook contains both Intel integrated graphics and an Nvidia GeForce 310M. Here are the results from lspci : 00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 18) ... 01:00.0 VGA compatib...
My Asus U36JC notebook contains both Intel integrated graphics and an Nvidia GeForce 310M. Here are the results from lspci: 00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (r...
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Adding nodes to Openstack Mitaka with Packstack
In my initial Openstack Mitaka deployment on four Fujitsu servers, I used a customized answer file specifying Neutron OVS bridge interfaces and the slave interfaces for bridges. The relevant setting in the answer file is: CONFIG_NEUTRON_OVS_BRIDGE_IFACES=br...
In my initial Openstack Mitaka deployment on four Fujitsu servers, I used a customized answer file specifying Neutron OVS bridge interfaces and the slave interfaces for bridges. The relevant setting in the answer file is: CON...
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국내 최대의 ‘만드는 사람들의 축제‘인 메이커 페어 서울(Maker Faire Seoul 2016)이 10월 15일과 16일 양일간 서울혁신파크에서 개최됩니다. #메이커 #메이커페어 #서울혁신파크
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Openstack Mitaka - Changing ceilometer default polling period in pipeline.yaml
I am currently working on a four-node installation of Openstack Mitaka and while testing Ceilometer alarm functionality, I ran into the problem of the alarm state always displaying insufficient data . Of the four nodes, mgmt01 is the storage node running gl...
I am currently working on a four-node installation of Openstack Mitaka and while testing Ceilometer alarm functionality, I ran into the prob...
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Linux System Engineer
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Peter, 정준
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System Engineer, programming enthusiast
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Columbus, Jeju
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고준's +1's are the things they like, agree with, or want to recommend.
God, good guys and guns
www.economist.com

HOSPITABLE, diminutive and currently reliant on a wheelchair, Brenda Stevenson, pastor of the New Outreach Christian Centre in Charlotte, No

One Port to Rule Them All! | Linux Journal
www.linuxjournal.com

I was chatting with Fred Richards on IRC the other day (flrichar on freenode) about sneaking around hotel firewalls. Occasionally, hotels wi

diff -u: What's New in Kernel Development | Linux Journal
www.linuxjournal.com

When you run a program as setuid, it runs with all the permissions of that user. And if the program spawns new processes, they inherit the s

What UBC has learned about doing MOOCs | Tony Bates
www.tonybates.ca

Engle, W. (2104) UBC MOOC Pilot: Design and Delivery Vancouver BC: University of British Columbia. The University of British Columbia, a pre

Your visual how-to guide for SELinux policy enforcement | Opensource.com
opensource.com

Dan Walsh of Red Hat shares a visual how-to guide for SELinux policy enforcement.

Not So Spooky: Linux "Ghost" Vulnerability
blog.trendmicro.com

The recent GHOST vulnerability in Linux is difficult to exploit and has a limited attack surface.

The Cow Says, Have Fun! | Linux Journal
www.linuxjournal.com

Sometimes, when the clock hits 3:00am, and you've been in the server room since 9 o'clock the previous day, you start to get a little batty.

Computer Networking, TCP/IP Basics
xahlee.info

This page is a condensed intro to TCP/IP. It is written for programers or scientists who wants a quick understanding how TCP/IP works. In 2

Working with Stdin and Stdout | Linux Journal
www.linuxjournal.com

Previously, I erroneously titled my column as "SIGALRM Timers and Stdin Analysis". It turned out that by the time I'd finished writing it, I

Monitoring Android Traffic with Wireshark | Linux Journal
www.linuxjournal.com

The ubiquity and convenience of smartphones has been a real boon for getting information on the go. I love being able to jump on a Wi-Fi hot

Linux Foundation Certified System Administrator
training.linuxfoundation.org

Learn from the best with training from the Linux Foundation. Our comprehensive Linux training includes online, classroom, and corporate trai

Learn from the best with training from the Linux Foundation. Our ...
training.linuxfoundation.org

Learn from the best with training from the Linux Foundation. Our comprehensive Linux training includes online, classroom, and corporate trai

It Actually Is Rocket Science | Linux Journal
www.linuxjournal.com

I've never once made a model rocket. I've always wanted to, but apart from "tube with explodey rocket part", I really didn't know where to s

Google Noto Fonts
www.google.com

Beautiful and free fonts for all languages. Noto is Google’s font family that aims to support all the world’s languages. Its design goal is

The Indie Bubble Is Popping.
jeff-vogel.blogspot.com

Writing this article really stressed me out. I reworked it over a dozen times. To calm down a little, I will intersperse this with image tha