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==== Heartbeat with Comoonics ====

Has to be hostdependant:

  /var/lib/heartbeat/
  
Make "hostdependant":

  com-mkcdsl –a /var/lib/heartbeat/
  
==== Useful Commands ====
  
Delete hostdependency:

  com-rmcdsl -d /srv/www/tomcat6/work
  
Execute same command on all nodes (requires "comoonics-cluster-tools-py" RPM Package):

  com-dsh -v hostname
  com-dsh -vvvvv hostname
  com-dsh -v rctomcat6 stop
  com-dsh --timeout=30 -v rctomcat6  stop
  com-dsh --timeout=30 -v rctomcat6  start
  
Note: There is a "--ssh_hostkey" option, which is set in default to "ask". Options: 
  accept, ask, or strict 
To avoid user input ("yes" or "no" during connnection) this should be changed to "accept" inside the script.
  
To shorten the shutdown execute

  sync

on all nodes!
==== Update Initrd ====

  /opt/atix/comoonics-bootimage/mkinitrd -f /mnt/newroot/boot/initrd-$(uname -r) $(uname -r)
  
Update Initrd for another Kernel

  /opt/atix/comoonics-bootimage/mkinitrd -f /boot/initrd-2.6.16.60-0.54.5-smp 2.6.16.60-0.54.5-smp

kernel is in: /lib/modules

Update software:

  zypper update --type=package

  com-mkcdslinfrastructure --migrate

  mount /boot
  cp /boot/initrd-$(uname -r) /boot/temp/initrd-$(uname -r).bak
  /opt/atix/comoonics-bootimage/mkinitrd /boot/initrd-$(uname -r) $(uname -r)

  reboot nodes
  
==== Initrd SLES10 ====
To create a shared_root initrd execute

  /opt/atix/comoonics-bootimage/mkinitrd -f /mnt/newroot/boot/initrd-$(uname -r) $(uname -r)
  
To create a new initrd in running sles11 shared_root execute 

  /opt/atix/comoonics-bootimage/mkinitrd -f /mnt/newroot/boot/initrd-$(uname -r) $(uname -r)
==== Initrd SLES11 ====

To create a shared_root initrd execute

  chroot /mnt/newroot /opt/atix/comoonics-bootimage/mkinitrd /boot/initrd-$(uname -r) $(uname -r)
  
To create a new initrd in running sles11 shared_root execute

  /opt/atix/comoonics-bootimage/mkinitrd /boot/initrd-$(uname -r) $(uname -r)
  
**Very IMPORTANT:**

  echo "ocfs2-kmp-default" >> /etc/comoonics/bootimage/rpms.initrd.d/sles11/ocfs2.list
  
==== Free Hosts ====


<code>
#!/bin/bash
/usr/bin/com-dsh -v hostname -f 2> /root/freenodes/free_hosts

sed 's/'Iuclid'/'iuclid'/g' /root/freenodes/free_hosts > /root/freenodes/free_hosts_temp

FILE="/root/freenodes/free_hosts_temp"
mkdir /root/freenodes 2> /dev/null

#if [ -s $FILE ] && [ grep iuclid* /root/freenodes/free_hosts_temp ]
if [ -s $FILE ]
then

HOST=`/usr/bin/grep iuclid* /root/freenodes/free_hosts_temp | /usr/bin/sed -n 1p | awk '{printf $1 ""}'`

/bin/echo "-----------------"
/bin/echo "Next free Host:"
echo $HOST

IP=`/usr/bin/grep -i $HOST /etc/hosts | /usr/bin/awk '{printf $1 ""}'`
/bin/echo "-----------------"
echo "IP is:"
echo $IP

else
echo "No free Node available. Please contact TechniData Datacenter!"
exit 1
fi

printf "$IP" > /root/freenodes/IP
printf "$HOST" > /root/freenodes/HOST

exit


/scripts/free.sh
com-dsh - Python Distributed Shell
Process host list
Test hosts for connectivity.
Host loop:
Display loop:

Host      | Output:
----------+-------------------------------------------------------------------
iuclid101 | iuclid101.site
----------+-------------------------------------------------------------------
Next free Host:
Iuclid102
-----------------
IP is:
192.168.1.16


Local Script:

#!/usr/bin/perl
# run this under: eval $(this script)

open (DATA, "ssh -t 192.168.1.15 /scripts/free.sh |");
while (<DATA>) {
  $Line=$_;
  print (STDERR $Line);
    if ($Line =~ /^Next free Host:/) { $Host=<DATA>; }
      if ($Line =~ /^IP is:/) { $IP=<DATA>; }
      }

      chomp ($Host);
      chomp ($IP);
      print qq[export Host="$Host"\n];
      print qq[export IP="$IP"\n];
</code>
==== Checked Packets (SLES10) ====

<code>
comoonics-pythonosfix-py-0.1-2
comoonics-tools-py-0.1-7
comoonics-bootimage-listfiles-sles10-0.1-4
comoonics-bootimage-listfiles-all-0.1-15
comoonics-cluster-py-0.1-27
comoonics-cdsl-py-0.2-32
comoonics-bootimage-initscripts-1.4-9.sles10
comoonics-bootimage-extras-ocfs2-0.1-10
sysvinit-comoonics-2.86-21.21
comoonics-base-py-0.1-11
comoonics-bootimage-listfiles-sles-0.1-7
comoonics-bootimage-1.4-64
</code>

==== Checked Packets (SLES11) ====
<code>
comoonics-pythonosfix-py-0.1-2
comoonics-bootimage-extras-ocfs2-0.1-10
comoonics-bootimage-initscripts-1.4-11.sles11
comoonics-bootimage-listfiles-sles11-0.1-8
comoonics-base-py-0.1-19
comoonics-cdsl-py-0.2-37
comoonics-bootimage-listfiles-sles-0.1-7
sysvinit-comoonics-2.86-195.2
comoonics-cluster-py-0.1-33
comoonics-bootimage-listfiles-all-0.1-16
comoonics-tools-py-0.1-9
comoonics-cluster-tools-py-0.1-16
comoonics-bootimage-1.4-79_4
</code>

==== Check Version ====

   cat /opt/atix/comoonics-bootimage/boot-scripts/etc/comoonics-release


==== Bonding ====

/etc/modprobe.conf

<code>
options bond0 miimon=30 mode=1
alias bond0 bonding
</code>

/etc/sysconfig/network/ifcfg-bond0

<code>
NM_CONTROLLED="no"
DEVICE="eth0"
STARTMODE="nfsroot"
TYPE="Ethernet"
</code>

/etc/sysconfig/network/ifcfg-eth0

<code>
NM_CONTROLLED="no"
DEVICE="eth0"
STARTMODE="nfsroot"
TYPE="Ethernet"
USERCTL="no"
ONBOOT="yes"
MASTER="bond0"
SLAVE="yes"
BOOTPROTO="none"
</code>

/etc/sysconfig/network/ifcfg-eth1

<code>
NM_CONTROLLED="no"
DEVICE="eth1"
STARTMODE="nfsroot"
TYPE="Ethernet"
USERCTL="no"
ONBOOT="yes"
MASTER="bond0"
SLAVE="yes"
BOOTPROTO="none"
</code>

/etc/cluster/cluster.conf

<code>
<eth name="eth0" mac="00:11:22:AB:CD:EE" master="bond0" slave="yes"/>
<eth name="eth1" mac="00:11:22:AB:CD:EF" master="bond0" slave="yes"/>
<eth name="bond0" ip="192.168.123.45" mask="255.255.255.0" gateway=""/>
</code>

==== Alternative Root Disk ====

To boot with another shared-root-disk (e. g. a cloned device such as sdb) enter in Grub
  
  root=/dev/xxx
  
to overwrite fstab settings during boot in grub shell or gui.