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GlenHertz / btrfs

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Preparing for Migration

  1. Back up mythtv database: https://www.mythtv.org/wiki/Backend_migration

Notes for my zfs->btrfs migration

Boot into Linux Mint 17.1 Cinnamon live CD/USB

I'm using the following mounts, yours may differ:

  1. /dev/sda -> a large hard drive
  2. /dev/sdb -> a temporary USB stick with the Ubuntu installer on it
  3. /dev/sdc -> a permanent USB stick to boot from

Pre-boot:

  1. Enable UEFI boot in bios
  2. Start "Try Ubuntu" to full boot

In "Try Ubuntu":

  1. apt-get install btrfs-tools

Start Ubuntu installer

  1. Select to make your own partitions
  2. Select /dev/sda to be btrfs, formated, mount /
  3. On /dev/sdc1 (USB boot stick), make first partition at least 10 MB of type "EFI Boot Partition"
  4. Make rest of sdc into a partition: /dev/sdc2, ext2, format, mount /boot
  5. Walk through installer
  6. Reboot, remove /dev/sdb, check that it boots correctly

Post reboot:

  1. apt-get update
  2. apt-get install apt-btrfs-snapshot
  3. apt-get ugprade
  4. Add second /btrfs drive: btrfs device add /dev/sdb /
  5. Convert to raid1: btrfs balance -mconvert=raid1 -dconvert=raid1 /
  6. Reeboot

Migrate old users, /home

mkdir /mnt/btrfs
mount /dev/sda /mnt/btrfs
cd !$
btrfs su sn @ @_1_installed
btrfs su sn @home @_home_1_installed

Check that users IDs line up between old and new install

chown -R mythtv:mythtv /home/mythtv

Set IP address

Install mythtv

wajig install mythtv
# set "mythtv" for mysql root and mythtv user passwords

Follow migration guide (using export UGIDLIMIT=1000): http://www.cyberciti.biz/faq/howto-move-migrate-user-accounts-old-to-new-server/

Old stuff:

From a Terminal:

mkdir /mnt/btrfs
mount -o defaults /dev/sda3 /mnt/btrfs
cd !$
# Setup standard Ubuntu subvolumes:
btrfs subvolume create @
btrfs subvolume create @home
# Copy old files across to btrfs:
mkdir /mnt/old
mount /dev/sdb2 /mnt/old
rsync -av --exclude 'mnt' --exclude 'home'  /mnt/old/ /mnt/btrfs/@/  # After we know we can boot cp excluded
cd @/etc
# find . -name '*zfs*'  # remove these files
cd /mnt/btrfs/@
for dir in dev proc sys; do mount -o bind /$dir ./$dir; done
chroot .
mount /dev/sda2 /boot
ls -l /dev/disk/by-uuid

Edit etc/fstab to be something like:

# / was on /dev/sda3 during installation
UUID=15060261-d3a4-4c1d-840c-bce526a72e62 	/               btrfs defaults,subvol=@ 0 1
# /boot was on /dev/sda2 during installation
UUID=1183af99-3714-4e95-8cbc-8b20c3a9fb81       /boot           ext4    defaults        0       2

Update software:

apt-get update
apt-get upgrade

Before the reboot:

umount /boot
exit # chroot
cd /mnt/btrfs/@
for dir in dev proc sys; do umount ./$dir; done  # get some error here
lsof proc  # does it show anything for why you can't unmount...anyway...carry on.
umount /mnt/sda2

old stuff (WIP):

df -h
mkfs.btrfs -L btrfs_pool -m raid1 -d raid1 /dev/sda /dev/sdb
btrfs filesystem show
mkdir /mnt/btrfs_pool
mount /dev/sdb /mnt/btrfs_pool  # pick any dev from raid
btrfs subvolume list /mnt/btrfs_pool 
btrfs filesystem df /mnt/btrfs_pool # true usage numbers
df -h # false usage numbers?
umount /mnt/btrfs_pool

Install using Ubuntu installer (do not format, pick one dev or raid1 as / mount point)

mint ~ # btrfs subvolume list /mnt/btrfs_pool
ID 258 gen 26 top level 5 path @
ID 259 gen 21 top level 5 path @home

mint ~ # btrfs subvolume create /mnt/btrfs_pool/@albums
Create subvolume '/mnt/btrfs_pool/@albums'
mint ~ # btrfs subvolume create /mnt/btrfs_pool/@mythtv
Create subvolume '/mnt/btrfs_pool/@mythtv'
mint ~ # btrfs subvolume create /mnt/btrfs_pool/@scratch
Create subvolume '/mnt/btrfs_pool/@scratch'
mint ~ # btrfs subvolume list /mnt/btrfs_pool
ID 258 gen 26 top level 5 path @
ID 259 gen 21 top level 5 path @home
ID 263 gen 29 top level 5 path @albums
ID 264 gen 30 top level 5 path @mythtv
ID 265 gen 31 top level 5 path @scratch

mint / # umount /mnt/btrfs_pool
# Make a directory structure so it is the same as source copy:
mint / # mkdir /mnt/btrfs_compat_dirs
mint / # mount -o compress,subvol=@ /dev/sdb /mnt/btrfs_compat_dirs/
mint / # mount -o compress,subvol=@home /dev/sdb /mnt/btrfs_compat_dirs/home
mint / # mkdir /mnt/btrfs_compat_dirs/mnt/albums
mint / # mount -o subvol=@albums /dev/sdb /mnt/btrfs_compat_dirs/mnt/albums
mint / # mkdir /mnt/btrfs_compat_dirs/mnt/mythtv
mint / # mount -o subvol=@mythtv /dev/sdb /mnt/btrfs_compat_dirs/mnt/mythtv
mint / # mkdir /mnt/btrfs_compat_dirs/mnt/scratch
mint / # mount -o compress,subvol=@scratch /dev/sdb /mnt/btrfs_compat_dirs/mnt/scratch

rsync -av /path/to/sources/ /mnt/btrfs_compat_dirs/

#btrfs subvolume create /mnt/btrfs_pool/root  # gets mounted to / with -o subvol=root
#btrfs subvolume create /mnt/btrfs_pool/home  # gets mounted to /home with -o subvol=home
#btrfs subvolume create /mnt/btrfs_pool/mnt/albums # gets mounted to /mnt/albums with -o subvol=albums
#btrfs subvolume create /mnt/btrfs_pool/mnt/mythtv # gets mounted to /mnt/mythtv with -o subvol=mythtv
#btrfs subvolume create /mnt/btrfs_pool/mnt/scratch # gets mounted to /mnt/scratch with -o subvol=scratch

In /etc/fstab:

LABEL=btrfs_pool    /              btrfs   defaults,compress,subvol=@  0 0
LABEL=btrfs_pool    /home          btrfs   defaults,compress,subvol=@home  0 0
LABEL=btrfs_pool    /mnt/albums    btrfs   defaults,subvol=@albums         0 0
LABEL=btrfs_pool    /mnt/mythtv    btrfs   defaults,subvol=@mythtv         0 0
LABEL=btrfs_pool    /media/btrfs   btrfs   defaults,noauto,compress,subvolid=0    0 0

Setup printer

  1. http://chadchenault.blogspot.ca/2012/05/brother-hl-2270dw-printer-driver.html
  2. Set to HQ1200 DPI
  3. Set to NoTumble duplex

Setup cloudprint

  1. git clone https://github.com/armooo/cloudprint
  2. cd cloudprint
  3. cp -r cloudprint /opt/
  4. cd /opt/cloudprint
  5. ./cloudprint.py -c # type in Google credentials (don't use your real Google account -- security risk)
  6. apt-get install python-daemon
  7. Add file /etc/cron.d/cloudprint:
# /etc/cron.d/cloudprint

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

@reboot   root /opt/cloudprint/cloudprint.py -d -a /root/.cloudprintauth -p /var/lib/cloudprint.pid	
@hourly   root /opt/cloudprint/cloudprint.py -d -a /root/.cloudprintauth -p /var/lib/cloudprint.pid

Run /opt/cloudprint/cloudprint.py -d -a /root/.cloudprintauth -p /var/lib/cloudprint.pid and then check that cat /var/lib/cloudprint.pid has the process ID of the running process (use ps auxf).

MythTv migration

Follow these instructions (http://www.mythtv.org/wiki/Backend_migration) and remember:

  1. Use the new mythtv database password in /etc/mythtv/config.xml (must update all frontends to use new password)
  2. Change the database server host from localhost to the computer's IP address in:
  3. /etc/mythtv/config.xml
  4. /etc/mysql/debian
  5. /etc/mysql/my.cnf (the bind address)

Setup scanner

Add your user to the "scanner" group and then log out and back in.

Create file /etc/udev/rules.d/50-brother-scanner.rules:

SUBSYSTEM!="usb_device", ACTION!="add", GOTO="brother_rules_end"

# Brother ADS-2000

ATTR{idVendor}=="04f9", ATTR{idProduct}=="60a0", MODE="0666", OWNER="hertz", GROUP="scanner"

LABEL="brother_rules_end"

Then restart udev with sudo service udev restart

Download VueScan for Linux from Hamrick.com and tar -zxvf vuex6494.tgz then cp -a Vuescan/* /usr/bin and enter license info.

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License:MIT License