DRBD, heartbeat on Debian Etch

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DRBD & Heartbeat on Debian Etch

Install DRBD

• • • DRBD is now part of the kernel, so the build part is deprecated

• // START deprecated

Unfortunately, drbd is not actively available as a package under Debian Etch, so it has to be build from source.

Luckily this can be done automatically with debian.

apt-get install module-assistant build-essential drbd0.7-module-source

## Then build the module
m-a a-i drbd0.7

• // END deprecated

Setup some basic drbd replication [internal meta - partition]

resource drbd {
  protocol C;
  incon-degr-cmd "killall heartbeat";
  disk {
    on-io-error panic;
  }
  syncer {
    rate 10M; # Note: 'M' is MegaBytes, not MegaBits
  }
  on server1 {
    device    /dev/drbd0;
    disk      /dev/hdc3;
    address   192.168.0.110:7789;
    meta-disk  internal;
  }
  on server2 {
    device    /dev/drbd0;
    disk      /dev/hda3;
    address   192.168.0.140:7789;
    meta-disk  internal;
  }
}

Of course adjust to your need.

Install heartbeat

apt-get install heartbeat

Setup heartbeat (basic)

Edit both host files ( /etc/ha.d/authkeys )

auth 2
1 crc
2 sha1 ThisIsASampleKeyAnythingAlphaNumericIsGoodHere
3 md5 ThisIsASampleKeyAnythingAlphaNumericIsGoodHere

Edit HA for master node ( /etc/ha.d/ha.cf )

keepalive 1
deadtime 10
warntime 5
initdead 60
udpport 694
ucast eth0 192.168.0.140 ### Change to 192.168.0.110 for slave
auto_failback off
node server1
node server2

Edit resources ( /etc/ha.d/haresources )

server1 drbddisk::drbd \
        Filesystem::/dev/drbd0::/data::ext3 \
        mysql \
        apache2 \
        IPaddr::192.168.0.180/24

Update systemfiles

Add needed servers to hosts file

[ ... ]
192.168.0.110   server1
192.168.0.140   server2
192.168.0.180   server
[ ... ]

chmod /etc/ha.d/authkeys files

chmod 0600 /etc/ha.d/authkeys

Prepare new drbd partition for data

mkfs.ext3 /dev/drbd0

Setup exim

dpkg-reconfigure exim4-config

Mount and prepare drbd disk

mkdir /data
mount /dev/drbd0 /data

## Create appropriate dirs for data to reside on or hardlink
mkdir -p /data/var/log/apache2
mkdir /data/var/log/mysql
chown www-data: /data/var/log/apache2
chown mysql: /data/var/log/mysql
mkdir -p /data/var/lib/
mv /var/lib/mysql /data/var/lib
chown mysql: /data/var/lib/mysql
mkdir /data/var/www/
chown www-data: /data/var/www

Install services

## Apache + php5 + mysql
apt-get install apache2 php5 php5-mysql mysql-server

## pureftpd
apt-get install pure-ftpd

Heartbeat controlled ressources

Stop services and let heartbeat handle it:

/etc/init.d/apache2 stop
/etc/init.d/mysql stop

## Copy to 
cp -p /etc/init.d/mysql /etc/ha.d/resource.d/
cp -p /etc/init.d/apache2 /etc/ha.d/resource.d/

## Remove old init-scripts for mysql/apache
update-rc.d -f apache2 remove
update-rc.d -f mysql remove

## Config to use the new storage (/data)