Unix on kenops

Docker volume backup and restore the easy way.

Mon, 29 Aug 2022 21:06:02 +0000

I haven’t had to move docker volumes around in a few years, but I finally had the need today. As usual, I searched for the process, knowing that most examples are… well… not very good. Well, as I almost resorted to pulling a manual job using ubuntu, I found a great write-up by Jarek Lipski on Medium. Here’s how you backup using alpine and tar. Also, make sure you “docker stop” the containers that use the volume, so you get a consistent backup.

Add HEIC support to nextcloud

Mon, 18 Jan 2021 01:57:59 +0000

From https://eplt.medium.com/5-minutes-to-install-imagemagick-with-heic-support-on-ubuntu-18-04-digitalocean-fe2d09dcef1

sudo sed -Ei 's/^# deb-src /deb-src /' /etc/apt/sources.list
sudo apt-get update
sudo apt-get install build-essential autoconf libtool git-core
sudo apt-get build-dep imagemagick libmagickcore-dev libde265 libheif
cd /usr/src/
sudo git clone https://github.com/strukturag/libde265.git
sudo git clone https://github.com/strukturag/libheif.git
cd libde265/
sudo ./autogen.sh
sudo ./configure
sudo make
sudo make install
cd /usr/src/libheif/
sudo ./autogen.sh
sudo ./configure
sudo make
sudo make install
cd /usr/src/
sudo wget https://www.imagemagick.org/download/ImageMagick.tar.gz
sudo tar xf ImageMagick.tar.gz
cd ImageMagick-7*
sudo ./configure --with-heic=yes
sudo make
sudo make install
sudo ldconfig

sudo apt install php-imagick
cd /usr/src/
wget http://pecl.php.net/get/imagick-3.4.4.tgz
tar -xvzf imagick-3.4.4.tgz
cd imagick-3.4.4/
apt install php7.2-dev
phpize
./configure
make
make install
sudo phpenmod imagick

A restart of apache2 should finish the job. Check with the phpinfo() call…

Password-less ssh in 2 Glorious Steps...

Wed, 17 Jun 2020 23:54:55 +0000

Local System - Let’s call it alpha
Remote System we don’t want to have to enter passwords for,
Let’s call it foxtrot

Prep: Harden your existing ssh keys since RSA 1024 sucks. This will create a new 4096 version - ed22519 is actually preferred so you can skip the rsa creation if preferred.

me@alpha$ mv ~/.ssh/id_rsa ~/.ssh/id_rsa_legacy
me@alpha$ mv ~/.ssh/id_rsa.pub ~/.ssh/id_rsa_legacy.pub

Step 1: Generate new keys:

me@alpha$ ssh-keygen -t rsa -b 4096 -o -a 100 #RSA version
me@alpha$ ssh-keygen -o -a 100 -t ed25519 #Preferred ed25519 version

Step 2: Copy the Ed25519 keys to the remote system called foxtrot:

HomeLab Build

Fri, 05 Jun 2020 05:36:50 +0000

Since I had a old windows laptop as a plex and file server for years I thought it would be good to try something new. After researching options I ddecided to try FreeNAS. Since it has ZFS and I’m an old Sun guy - why not. Well…. After a few weeks I decided to abandon FreeNAS and roll my own using a ThinkCentre M93p Tiny. I’ll try to post some notes on how the build goes.

Raspberry Pi backup using fsarchiver and other tricks

Tue, 13 Jun 2017 06:56:17 +0000

So I ran into a few issues using the dd image backup I referenced prior Raspberry Pi 3 SDCard backup

The Image is very large even though the data was not. For example on a 32GB SD card I was getting a 12GB file. I only have 3GB of data! so that was a bummer.
When it comes time to recover, I have to expand the gz image file to a full 32GB to then image it onto another SD device. There’s tricks around this I’m sure but still.
Since dd was reading 100% of the SD card (/dev/mmcblk0) even with compression it took a LONG time to create the image. 20 minutes or so. Since I’m backing up a live system this was a real issue.

I did manage to figure out how to create a partial image if your partition sizes were smaller than the actual device - This seemed to work but it still was storing 6.6GB of data which was over double what I actually had:

Raspberry Pi 3 SDCard backup...

Mon, 27 Mar 2017 17:52:31 +0000

From https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=77492 dd if=/dev/mmcblk0 | gzip > /media/usb/mmcblk0.img.gz Checking if this works. More to come :)

Living on a Raspberry Pi!

Sun, 05 Mar 2017 01:52:59 +0000

This feels a little weird! Playing with the overclocking and it really makes a difference! The settings below look stable but make the proc very hot (over 85 degrees c.) From /boot/config.txt:

Overclock settings - disabled until heat sink is added. 170327 SeanK

#arm_freq=1350 #core_freq=500 #over_voltage=4 #disable_splash=1 ##force_turbo=1 #boot_delay=1 #sdram_freq=500 Also created a script to put the governor in ondemand mode and put it in the init.d directory:

root@webpi:/sys/devices/system/cpu/cpu0/cpufreq# cat /etc/init.d/sk-perf-set-cpu-governor.sh
#!/bin/sh
#
# 20170327, Sean Kennedy
#
# From /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors:
# conservative ondemand userspace powersave performance
governor="ondemand"
echo $governor > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
root@webpi:/sys/devices/system/cpu/cpu0/cpufreq#

Also got ganglia to report on CPU Frequency and Temp using this init script….

Netgear Stora NAS

Sat, 24 Oct 2009 22:31:50 +0000

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Since I work helping companies manage their enterprise storage environment, I tend to be very anal with storing my data at home. It needs to be resilient, redundant, and fast. Why? I’m retarded. Most of the time, I spend more than enough money on something I have to manage and tweak constantly. No inexpensive NAS device has had all the features I wanted in an embedded device - until now.

Goodbye Sun Microsystems...

Mon, 11 May 2009 05:03:33 +0000

So Oracle is in the final stages of buying Sun Microsystems Inc, a company I adored for years. It’s too bad to see Sun go, and with all other Oracle buyouts I’m sure not much will be left of the original idea of Sun. It’s sad to see, but after seeing Sun as the premier UNIX envorinment in the late 90’s go through it’s demise in early 2000’s the writing was on the wall. I remember distinctly being at a good friends house discussing a plan we had to get in the car, drive to Merlo Park CA, and tell the then CEO exactly how to get back on track:

Sun Cheatsheet

Wed, 04 Mar 2009 17:28:12 +0000

I published my Sun Cheatsheet document to the world recently. It’s a compilation of Sun commands and processes that I documented over the years. Enjoy! http://docs.google.com/Doc?id=dhjhzg6x_3c6d658