* Crear cluster
Video del funcionamiento del cluster
* Es requerido el grupo de paquetes "High Availability Management"
* Iniciar servicio ricci y hacerlo persistente para autoinicio
* Establecer password para el usuario ricci
* Asegurar comunicacion entre los nodos del clsuter
* En el archivo hosts son requeridas las ips y hostname de los nodos
ccs -h rhelcluster01 --createcluster rhelcluster
* Añadir nodos
ccs -h rhelcluster01 --addnode rhelcluster02
ccs -h rhelcluster01 --addnode rhelcluster01
* Listar nodos
ccs -h rhelcluster01 --lsnodes
* Agregar fence del cluster
ccs -h rhelcluster01 --addfencedev myfence agent=fence_virt
Si es equipo fisico hp y tiene ILO
<fencedevice agent="fence_ilo4" auth="password" ipaddr="ip_ilo" login="cluster" name="nodo1" passwd="cluster123"/>
* Agregar un metodo al fence del cluster
ccs -h rhelcluster01 --addmethod mthd1 rhelcluster01
ccs -h rhelcluster01 --addmethod mthd1 rhelcluster02
* Agregar un dominio del failover (ordered) tomando en cuenta la prioridad de los nodos el dominio de failover
ccs -h rhelcluster01 --addfailoverdomain rhelcluster ordered
* Se agregan nodos el dominio del failover
ccs -h rhelcluster01 --addfailoverdomainnode rhelcluster rhelcluster01
ccs -h rhelcluster01 --addfailoverdomainnode rhelcluster rhelcluster02
* Visualiza configuracion del dominio failover
ccs -h rhelcluster01 --lsfailoverdomain
* Agregar un filesystem para failover
ccs -h rhelcluster01 --addresource fs name=cluster_fs device=/dev/vg_cluster/lv_datos mountpoint=/cluster_fs fstype=ext4
* Agregar un servicio al dominio del failover
ccs -h rhelcluster01 --addservice cluster_filesystem domain=rhelcluster recovery=relocate autostart=1
* Agregar un subservicio del dominio del failover
ccs -h rhelcluster01 --addsubservice cluster_filesystem fs ref=cluster_fs
ccs -h rhelcluster01 --addsubservice cluster_filesystem ip address=10.188.18.76 monitor_link=yes sleeptime=10
* Crear un disco quorum (disco compartido)
mkqdisk -c /dev/vdc -l clusterqdisk
* Agregar el quorum al cluster
ccs -h rhelcluster01 --setquorumd label=clusterqdisk
** Es posible agregar una heuristica para el voto del quorum
<heuristic program="ping -c1 -w2 10.188.18.1"/>
* Listar quorum y status del quorum
ccs -h rhelcluster01 --lsquorum
mkqdisk -L
* Propagar configuracion del cluster
ccs -h rhelcluster01 --sync --activate
* Validar configuracion de cluster
ccs -h rhelcluster01 --checkconf
* Activar todos los nodos
ccs -h rhelcluster01 --startall
* Activar un nodo
ccs -h rhelcluster01 --start
* Desactivar un nodo
ccs -h rhelcluster01 --stop
* Ver estado del cluster
clustat
Ejemplo de salida
[root@rhelcluster02 ~]# clustat
Cluster Status for rhelcluster @ Mon May 23 12:52:41 2016
Member Status: Quorate
Member Name ID Status
------ ---- ---- ------
rhelcluster01 1 Online, rgmanager
rhelcluster02 2 Online, Local, rgmanager
/dev/block/252:32 0 Online, Quorum Disk
Service Name Owner (Last) State
------- ---- ----- ------ -----
service:cluster_filesystem rhelcluster01 started
service:cluster_filesystem2 rhelcluster02 started
* Si se requiere gfs2 (shared filesystem )
service clvmd start
chkconfig clvmd on
mkfs -t gfs2 -p lock_dlm -t rhelcluster:lvgfs -j 2 /dev/vg_compartido/lvgfs
- Monstar gfs2
mount -t gfs2 -o noatime /dev/vg_compartido/lvgfs /gfs/
- En el fstab
/dev/mapper/vg_compartido-lvgfs /gfs gfs2 defaults,noatime,nodiratime 0 0
* Salida de archivo de configurcion /etc/cluster/cluster.conf
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<?xml version="1.0"?>
<cluster config_version="25" name="rhelcluster">
<fence_daemon/>
<clusternodes>
<clusternode name="rhelcluster01" nodeid="1">
<fence>
<method name="mthd1">
<device name="myfence"/>
</method>
</fence>
</clusternode>
<clusternode name="rhelcluster02" nodeid="2">
<fence>
<method name="mthd1">
<device name="myfence"/>
</method>
</fence>
</clusternode>
</clusternodes>
<cman/>
<fencedevices>
<fencedevice agent="fence_virt" name="myfence"/>
</fencedevices>
<rm>
<failoverdomains>
<failoverdomain name="rhelcluster" nofailback="0" ordered="1" restricted="0">
<failoverdomainnode name="rhelcluster01" priority="1"/>
<failoverdomainnode name="rhelcluster02" priority="2"/>
</failoverdomain>
<failoverdomain name="rhelcluster2" nofailback="0" ordered="1" restricted="0">
<failoverdomainnode name="rhelcluster02" priority="1"/>
<failoverdomainnode name="rhelcluster01" priority="2"/>
</failoverdomain>
</failoverdomains>
<resources>
<fs device="/dev/vg_cluster/lv_datos" fstype="ext4" mountpoint="/cluster_fs" name="cluster_fs"/>
<fs device="/dev/vg_cluster2/lvcluster2" fstype="ext4" mountpoint="/cluster2" name="cluster2"/>
<fs device="/dev/vg_cluster3/lv_cluster3" fstype="ext4" mountpoint="/cluster3" name="cluster3"/>
</resources>
<service autostart="1" domain="rhelcluster" name="cluster_filesystem" recovery="relocate">
<fs ref="cluster_fs"/>
<ip address="8.8.8.76" monitor_link="yes" sleeptime="10"/>
</service>
<service autostart="1" domain="rhelcluster2" name="cluster_filesystem2" recovery="relocate">
<fs ref="cluster2"/>
<ip address="8.8.8.77" monitor_link="yes" sleeptime="10"/>
<fs ref="cluster3"/>
</service>
</rm>
<quorumd label="clusterqdisk"/>
</cluster>
________________________
<?xml version="1.0"?>
<cluster config_version="60" name="ccc">
<clusternodes>
<clusternode name="ccc01" nodeid="1" votes="1">
<fence>
<method name="mthd1">
<device name="nodo1"/>
</method>
</fence>
</clusternode>
<clusternode name="ccc02" nodeid="2" votes="1">
<fence>
<method name="mthd1">
<device name="nodo2"/>
</method>
</fence>
</clusternode>
</clusternodes>
<cman transport="udpu"/>
<totem token="27000"/>
<fencedevices>
<fencedevice agent="fence_ilo4" auth="password" ipaddr="8.8.8.82" login="cluster" name="nodo1" passwd="ilo123"/>
<fencedevice agent="fence_ilo4" auth="password" ipaddr="8.8.8.83" login="cluster" name="nodo2" passwd="ilo123"/>
</fencedevices>
<rm>
<failoverdomains>
<failoverdomain name="ccc_pakcge1" nofailback="0" ordered="1" restricted="0">
<failoverdomainnode name="ccc01" priority="1"/>
<failoverdomainnode name="ccc02" priority="2"/>
</failoverdomain>
<failoverdomain name="ccc_pakcge2" nofailback="0" ordered="1" restricted="0">
<failoverdomainnode name="ccc02" priority="1"/>
<failoverdomainnode name="ccc01" priority="2"/>
</failoverdomain>
</failoverdomains>
<resources>
<fs device="/dev/vgxxn1/lvaaa" fstype="ext4" mountpoint="/opt/app/aaa/" name="lvaaa"/>
<fs device="/dev/vgxxn1/lvrrr_prm" fstype="ext4" mountpoint="/opt/app/rrr/prm/" name="lvrr_prm"/>
<fs device="/dev/vgxxn1/lvwww" fstype="ext4" mountpoint="/opt/app/www/" name="lvwww"/>
<fs device="/dev/vgxxn2/lvaaa2" fstype="ext4" mountpoint="/opt/app/aaa2/" name="lvaaa2"/>
<fs device="/dev/vgxxn2/lvrrr_sec" fstype="ext4" mountpoint="/opt/app/rrr/sec/" name="lvrrr_sec"/>
</resources>
<service autostart="1" domain="ccc_pakcge1" name="pakcge1" recovery="relocate">
<fs ref="lvaaa"/>
<fs ref="lvrrr_prm"/>
<fs ref="lvwww"/>
<ip address="8.8.8.84" monitor_link="yes" sleeptime="10"/>
</service>
<service autostart="1" domain="ccc_pakcge2" name="pakcge2" recovery="relocate">
<fs ref="lvaaa2"/>
<fs ref="lvrrr_sec"/>
<ip address="8.8.8.85" monitor_link="yes" sleeptime="10"/>
</service>
</rm>
<quorumd label="cluster_ccc" votes="2">
<heuristic program="ping -c1 -w2 8.8.8.1"/>
</quorumd>
</cluster>
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