Configuración del Cluster
- Desactivamos firewall y SELinux en ambos nodos.
- El usuario administrador del cluster será hacluster.
- Desactivaremos el Quorum, trabajando con dos nodos no tiene sentido.
- El nombre elegido para el cluster es BP.
- Daremos preferencia a node-1 para trabajar como Master.
- Crearemos los siguientes recurosos para el DRBD.
- Para los datos : BP_data.
- Para la sincronización : BP_syncro.
- Para el filesystem : BP_fs.
Observaciones
Instalamos paquetes en ambos nodos:
yum install corosync pcs pacemaker cman
Configuramos la contraseña para el usuario hacluster:
[node-1]# passwd hacluster [node-2]# passwd hacluster
Configuramos servicios:
[node-1]# service pcsd start [node-2]# service pcsd start [node-1]# chkconfig pcsd on [node-1]# chkconfig pacemaker on [node-2]# chkconfig pcsd on [node-2]# chkconfig pacemaker on
Autenticamos los nodos:
[node-1]# pcs cluster auth node-1 node-2 Username: hacluster Password: node-1: Authorized node-2: Authorized
Creamos el cluster:
[node-1] mkdir /etc/cluster [node-2] mkdir /etc/cluster [node-1]# pcs cluster setup --name BP node-1 node-2 node-1: Updated cluster.conf... node-2: Updated cluster.conf... Synchronizing pcsd certificates on nodes node-1, node-2... node-1: Success node-2: Success Restarting pcsd on the nodes in order to reload the certificates... node-1: Success node-2: Success
Arrancamos el cluster:
[node-1]# pcs cluster start --all node-1: Starting Cluster... node-2: Starting Cluster...
Comprobamos el estado del cluster:
node-1]# pcs status cluster Cluster Status: Last updated: Tue Mar 1 04:58:26 2016 Last change: Tue Mar 1 04:57:52 2016 Stack: cman Current DC: server2 - partition with quorum Version: 1.1.11-97629de 2 Nodes configured 0 Resources configured PCSD Status: node-1: Online node-2: Online [node-2]# pcs status cluster Cluster Status: Last updated: Tue Mar 1 05:00:33 2016 Last change: Tue Mar 1 04:57:52 2016 Stack: cman Current DC: server2 - partition with quorum Version: 1.1.11-97629de 2 Nodes configured 0 Resources configured PCSD Status: node-1: Online node-2: Online
Comprobamos el status de los nodos:
[node-1]# pcs status nodes Pacemaker Nodes: Online: node-1 node-2 Standby: Maintenance: Offline: Pacemaker Remote Nodes: Online: Standby: Maintenance: Offline: [node-2]# pcs status nodes Pacemaker Nodes: Online: node-1 node-2 Standby: Maintenance: Offline: Pacemaker Remote Nodes: Online: Standby: Maintenance: Offline: [node-1]# pcs status corosync Nodeid Name 1 node-1 2 node-2 [node-2]# pcs status corosync Nodeid Name 1 node-1 2 node-2
Comprobamos el status general:
[node-1]# pcs status Cluster name: BP WARNING: no stonith devices and stonith-enabled is not false Last updated: Thu Jul 7 13:16:43 2016 Last change: Thu Jul 7 13:14:47 2016 by root via crmd on node-2 Stack: cman Current DC: node-2 (version 1.1.14-8.el6-70404b0) - partition with quorum 2 nodes and 0 resources configured Online: [ node-1 node-2 ] Full list of resources: PCSD Status: node-1: Online node-2: Online
Desactivamos el fenced:
[node-1]# pcs property set stonith-enabled=false
Desactivamos el quorum:
[node-1]# pcs property set no-quorum-policy=ignore
Comprobamos las propiedades del clsuter:
[node-1]# pcs property Cluster Properties: cluster-infrastructure: cman dc-version: 1.1.14-8.el6-70404b0 have-watchdog: false no-quorum-policy: ignore stonith-enabled: false
Añadimos la IP Virtual:
[node-1]# pcs resource create IpVirt ocf:heartbeat:IPaddr2 ip=192.168.0.4 cidr_netmask=32 op monitor interval=30s
Añadimos los servicios MySQl y Tomcat:
[node-1]# pcs resource create MySQL ocf:heartbeat:mysql op monitor interval="20" timeout="60" [node-1]# pcs resource create Tomcat lsb:tomcat
Vincularemos la Ip Virtual a los servicios para que trabajen siempre juntos:
[node-1]#pcs constraint colocation add Tomcat MySQL INFINITY
Forzamos a que inicie primero la IP Virtual y luego los servicios:
[node-1]# pcs constraint order IpVirt then Tomcat Adding IpVirt Tomcat (kind: Mandatory) (Options: first-action=start then-action=start) [node-1]# pcs constraint order Tomcat then MySQL Adding Tomcat MySQL (kind: Mandatory) (Options: first-action=start then-action=start)
Damos preferencia al nodo que hará de master:
[node-1]# pcs constraint location MySQL prefers node-1=50 [node-1]# pcs constraint location Tomcat prefers node-1=50
Comprobamos restricciones:
[node-1]# pcs constraint
Location Constraints:
Resource: MySQL
Enabled on: node-1 (score:50)
Resource: Tomcat
Enabled on: node-1 (score:50)
Ordering Constraints:
start IpVirt then start Tomcat (kind:Mandatory)
start Tomcat then start MySQL (kind:Mandatory)
Colocation Constraints:
Tomcat with MySQL (score:INFINITY)
Gestión del DRBD
Creamos un nuevo CIB (Cluster Infromation Base):
[node-1]# pcs cluster cib add_drbd [node-1]# ls -al add_drbd -rw-r--r-- 1 root root 10665 7 jul 13:28 add_drbd [node-1]# pcs -f add_drbd resource create BP_data ocf:linbit:drbd drbd_resource=data op monitor interval=60 [node-1]# pcs -f add_drbd resource master BP_data_sync BP_data master-max=1 master-node-max=1 clone-max=2\ clone-node-max=1 notify=true
Consultamos la configuración del CIB:
[node1]# pcs -f add_drbd resource show
IpVirt (ocf::heartbeat:IPaddr2): Started node-1
MySQL (ocf::heartbeat:mysql): Started node-1
Tomcat (lsb:tomcat): Started node-1
Master/Slave Set: BP_data_sync [BP_data]
Stopped: [ node-1 node-2 ]
Activamos la configuración del CIB :
[node1]# pcs cluster cib-push add_drbd CIB updated [node-1]# pcs cluster cib add_fs [node-1]# pcs -f add_fs resource create BP_fs Filesystem device="/dev/drbd1" directory="/data" fstype="ext3"
El filesystem debe estar disponible en el Master :
[node1]# pcs -f add_fs constraint colocation add BP_fs BP_data_sync INFINITY with-rsc-role=Master
Debe arrancar antes DRBD para que el filesystem este disponible :
[node-1]# pcs -f add_fs constraint order promote BP_data_sync then start BP_fs Adding BP_data_sync BP_fs Adding BP_data_sync BP_fs (kind: Mandatory) (Options: first-action=promote then-action=start)
El filesystem debe estar montado antes de que arranque los servicios :
[node-1]# pcs -f add_fs constraint order BP_fs then MySQL Adding BP_fs MySQL (kind: Mandatory) (Options: first-action=start then-action=start) [node-1]# pcs -f add_fs constraint order BP_fs then Tomcat Adding BP_fs Tomcat (kind: Mandatory) (Options: first-action=start then-action=start)
Forzamso a todos los recursos a trabajar juntos :
[node-1]# pcs -f add_fs constraint colocation add BP_fs Tomcat IpVirt MySQL INFINITY with-rsc-role=Master
Aplicamos cambios :
[node1]# pcs cluster cib-push add_fs CIB updated
Comprobamos restricciones :
[node-1]# pcs constraint
Location Constraints:
Resource: MySQL
Enabled on: node-1 (score:50)
Resource: Tomcat
Enabled on: node-1 (score:50)
Ordering Constraints:
start IpVirt then start Tomcat (kind:Mandatory)
start Tomcat then start MySQL (kind:Mandatory)
promote BP_data_sync then start BP_fs (kind:Mandatory)
start BP_fs then start MySQL (kind:Mandatory)
start BP_fs then start Tomcat (kind:Mandatory)
Colocation Constraints:
Tomcat with MySQL (score:INFINITY)
BP_fs with BP_data_sync (score:INFINITY) (with-rsc-role:Master)
BP_fs with MySQL (score:INFINITY) (rsc-role:Started) (with-rsc-role:Master)
