I am a big fan of ZFS and I have it installed on every Linux/Unix machine I own. Including the machine I use for playing with Docker containers. And it was that machine where I saw a bunch of ZFS snapshots with weird random hexadecimal names. And it wasn’t one snapshot, nor two – it was hundreds of them. So I deleted them.

Guess what, Docker build started complaining:

error creating zfs mount: mount system/root/a4f339f95f920b918bb23290a3e831dc22477bc76ef0d3496224fc424e65ec67:/var/lib/docker/zfs/graph/a4f339f95f920b918bb23290a3e831dc22477bc76ef0d3496224fc424e65ec67: no such file or directory

Well, I guess that sorted who was to blame for all those long snapshots. You see, Docker gets smart if it detect ZFS and does a lot of smart things. Unfortunately those smart things result in a lot of snapshots. And I don’t like people (or software) messing with my ZFS. And obviously Docker didn’t like me messing with it either. :)

Fortunately, the solution is easy enough. One should reconfigure Docker to use overlay2 storage driver instead of ZFS one and short daemon restart later one can continue playing with Docker without having to deal with ZFS snapshot hell.

Now only if I could remember this when I reinstall the OS…

MAC address should be unique for each network card – whether it’s wireless or wired. It’s this uniqueness why some networks will use it to distinguish an authorized user from the unauthorized one. If you ever had a time-limited access to the network, chances are that your MAC address was used to block you once time is up.

I will leave it up to you to think of scenarios but I find randomizing my MAC address a useful option in Linux. Therefore, I created a script to automatically generate a new one. This script will randomize the last three octets of the MAC address while leaving the first three octets as they originally were. In effect this makes your computer present itself to the network as the new adapter from the same manufacturer.

ScriptCopy
#!/bin/bash

INTERFACE="eth0"

CURRENT_MAC=`/usr/sbin/ifconfig $INTERFACE | grep ether | awk '{print $2}'`
ORIGINAL_MAC=`/usr/sbin/ethtool -P $INTERFACE | rev | cut -d' ' -f1 | rev`
ORIGINAL_MAC_PREFIX=`echo $ORIGINAL_MAC | cut -d: -f1-3`
NEW_MAC="$ORIGINAL_MAC_PREFIX`/usr/bin/hexdump -n3 -e'3/1 ":%02x"' /dev/urandom`"

echo "Current MAC : $CURRENT_MAC"
echo "Original MAC: $ORIGINAL_MAC"
echo "New MAC ....: $NEW_MAC"

sudo /usr/sbin/ifconfig $INTERFACE down
sudo /usr/sbin/ifconfig $INTERFACE hw ether $NEW_MAC
sudo /usr/sbin/ifconfig $INTERFACE up