carlwgeorge

How I switched from mdadm to btrfs

After reading [this Ars Technica article][1], I decided that I wanted to start using btrfs on my home fileserver. It had been running for a few years with an mdadm raid-10 array, formatted with ext4, holding about 3.4 TB of data. I figured I would take advantage of some of the special capabilities of btrfs to perform the conversion in place. After some research, I formed my basic plan.

• backup data to external drives
• remove two of the drives from the mdadm raid-10
• configure those two drive with a btrfs raid-0 filesystem
• copy the data from the degraded mdadm raid-10 to the new btrfs raid-0
• completely deactivate the mdadm raid-10

carlwgeorge

Debian Kernel Hooks

Recently I setup my work laptop to dual boot Arch Linux and Ubuntu server with syslinux as my bootloader. I setup the laptop with a dedicated /boot partition that would be shared between the two operating systems. I added this boot entry to /boot/syslinux/syslinux.cfg.

LABEL ubuntu
    MENU LABEL Ubuntu 
    LINUX ../vmlinuz-3.8.0-29-generic
    APPEND root=LABEL=UBUNTU rw

INITRD ../initrd.img-3.8.0-29-generic

carlwgeorge

Let's install phpMyAdmin.

[root@test6 ~]# yum -v install phpMyAdmin

Yum resolves the 'php(language)' dependency with the highest available package, php56u-common, and adds it to the transaction.

--> Processing Dependency: php(language) >= 5.2.17 for package: phpMyAdmin-4.0.10.5-1.el6.noarch
TSINFO: Marking php56u-common-5.6.2-3.ius.centos6.x86_64 as install for phpMyAdmin-4.0.10.5-1.el6.noarch

carlwgeorge

moved to https://wiki.centos.org/CarlGeorge/CATPR

carlwgeorge

# dnf install phpMyAdmin
Using metadata from Mon May  4 13:49:37 2015
Dependencies resolved.
========================================================================================================
 Package                             Arch           Version                          Repository    Size
========================================================================================================
Installing:
 dejavu-fonts-common                 noarch         2.33-6.el7                       base          64 k
 dejavu-sans-fonts                   noarch         2.33-6.el7                       base         1.4 M
 libmcrypt                           x86_64         2.5.8-13.el7                     epel          99 k

carlwgeorge

https://github.com/rackerlabs/openstack-guest-agents-unix/tree/master/lib

https://github.com/rackerlabs/openstack-guest-agents-unix/releases

[root@test22 ~]# rpm -qi nova-agent
Name        : nova-agent
Version     : 1.39
Release     : 1
Architecture: x86_64

carlwgeorge

Keybase proof

I hereby claim:

• I am carlwgeorge on github.
• I am carlwgeorge (https://keybase.io/carlwgeorge) on keybase.
• I have a public key whose fingerprint is 21B0 BF53 BEA4 6F1B 0E8C 16B8 4BA2 F7E1 01D9 F512

To claim this, I am signing this object:

carlwgeorge

EL6

php70u-fpm + nginx (tcp)

yum install php70u-fpm-nginx
service php-fpm start
service nginx start

php70u-fpm + httpd24u (tcp)

carlwgeorge

                    | IUS mysql56u 5.6          | Fedora community-mysql 5.7

------------------------|---------------------------|--------------------------- ignore_db_dir | lost+found | tmpdir | /var/lib/mysqltmp | /var/tmp table_definition_cache | 4096 | 1400 table_open_cache | 4096 | 2000 max_connections | 400 | 151 max_connect_errors | 1000000 | 100 max_allowed_packet | 16M | 4M skip_name_resolve | 1 | 0

carlwgeorge

# yum shell
Loaded plugins: fastestmirror, langpacks, replace
> erase mariadb-libs
> install mariadb100u-libs mariadb100u-server
Loading mirror speeds from cached hostfile
 * base: mirror.us.leaseweb.net
 * epel: mirror.symnds.com
 * extras: mirror.us.leaseweb.net
 * ius: iad.mirror.rackspace.com