PACEMAKER

Installation

[ALL] installation pacemaker

sudo apt-get install pacemaker
edit /etc/default/corosync and enable corosync (START=yes) 

[ONE] generate corosync authkey

sudo corosync-keygen
(this can take a while if there's no enough entropy; download ubuntu iso image on the same machine while generating to speed it up or use keyboard to generate entropy)
copy /etc/corosync/authkey to all servers that will form this cluster (make sure it is owned by root:root and has 400 permissions). 

[ALL] Install DRBD and other needed tools

sudo apt-get install linux-headers-server psmisc drbd8-utils

[ALL] Pacemaker soll drbd managen

sudo update-rc.d -f drbd remove

CRM

crmadmin

Kompelette CIB löschen

crmadmin -E