Creaccion de un cluster en CentOS / RedHat

/// Instalamos los paquetes necesarios y la siguiente configuración

yum install epel-release -y

yum install pcs fence-agents-all -y

firewall-cmd --permanent --add-service=high-availability; firewall-cmd --reload

echo mypassword | passwd --stdin hacluster

systemctl enable --now pcsd

pcs cluster auth node1.labs.testing.local node2.labs.testing.local

Username: hacluster  
Password: mypassword

pcs cluster setup --start --name cluster node1.labs.testing.local node2.labs.testing.local

pcs cluster enable --all

/// NO poner en este estado si es un entorno de producción

pcs property set stonith-enabled=false

/// Creamos el recurso para compartir de la VIP

pcs resource create ClusterIP ocf:heartbeat:IPaddr2 ip=10.10.10.1 cidr_netmask=32 nic=vip191 op monitor interval=30s

/// Creamos un link desde la interfaz física a la virtual, hay que hacerlo en todos los nodos que formen el cluster.

ip link add link enp0s8 address 02:02:aa:bb:cc:11 vip191 type macvlan
pcs resource update ClusterIP nic=vip191
sysctl -w net.ipv4.conf.all.rp_filter=0
sysctl -w net.ipv4.conf.vip191.rp_filter=0
sysctl -w net.ipv4.conf.all.arp_ignore=1
systemctl stop NetworkManager
systemctl disable NetworkManager

/// Con esto podemos balancear el recurso de la virtual IP de un nodo a otro

pcs resource move ClusterIP [node1.labs.testing.local | node2.labs.testing.local]

// Con esto vemos el estado de los recursos activos

pcs status resources

// Para hacer la configuracion de la VIP y la MACVLAN persistente a reinicios, tenemos que meter los siguientes scripts en «/etc/sysconfig/network-scripts/», en ambos nodos del cluster

================================================================

ifup-macvlan

================================================================

#!/bin/bash
#
initscripts-macvlan
Copyright (C) 2014 Lars Kellogg-Stedman
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/.
. /etc/init.d/functions
cd /etc/sysconfig/network-scripts

. ./network-functions
[ -f ../network ] && . ../network
CONFIG=${1}
need_config ${CONFIG}
source_config
OTHERSCRIPT="/etc/sysconfig/network-scripts/ifup-${REAL_DEVICETYPE}"
if [ ! -x ${OTHERSCRIPT} ]; then

OTHERSCRIPT="/etc/sysconfig/network-scripts/ifup-eth"

fi
ip link add

link ${MACVLAN_PARENT}

name ${DEVICE}

type ${TYPE:-macvlan} mode ${MACVLAN_MODE:-private}
${OTHERSCRIPT} ${CONFIG}

================================================================

ifdown-macvlan

================================================================

#!/bin/bash
#
initscripts-macvlan
Copyright (C) 2014 Lars Kellogg-Stedman
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/.
. /etc/init.d/functions
cd /etc/sysconfig/network-scripts

. ./network-functions
[ -f ../network ] && . ../network
CONFIG=${1}
need_config ${CONFIG}
source_config
OTHERSCRIPT="/etc/sysconfig/network-scripts/ifdown-${REAL_DEVICETYPE}"
if [ ! -x ${OTHERSCRIPT} ]; then

OTHERSCRIPT="/etc/sysconfig/network-scripts/ifdown-eth"

fi
${OTHERSCRIPT} ${CONFIG}
ip link del ${DEVICE} type ${TYPE:-macvlan}

================================================================

ifcfg-vip191

================================================================

BOOTPROTO=none
NAME=vip191
DEVICE=vip191
DEVICETYPE=macvlan
TYPE=macvlan
ONBOOT=yes
NM_CONTROLLED=no
MACVLAN_PARENT=enp0s8
MACVLAN_MODE=private
MACADDR=02:02:aa:bb:cc:11
PREFIX=32

// Por ultimo, modificaremos el fichero «/etc/sysctl.conf» y añadiremos (NO BORRAR NADA) las siguientes lineas al final del fichero

net.ipv4.conf.all.rp_filter=0 -----> Si esta linea existe, la dejamos tal y como esta, solo añadimos las dos siguientes.
net.ipv4.conf.vip191.rp_filter=0
net.ipv4.conf.all.arp_ignore=1

// Para finalizar, reiniciaremos ambos nodos y comprobaremos que la VIP nos contesta con la MAC virtual

[root@node03 ~]# nmap -sP clustervip01.labs.testing.local --> Yo he añadido una entrada a los ficheros /etc/hosts de mis equipos, este registro apunta a la IP 10.10.10.1, la vip del recurso ClusterIP
Starting Nmap 6.40 ( http://nmap.org ) at 2019-06-11 17:43 CEST

Nmap scan report for clustervip01.labs.testing.local (10.10.10.1)

Host is up (0.00032s latency).

MAC Address: 02:02:AA:BB:CC:11 (Unknown)

Nmap done: 1 IP address (1 host up) scanned in 0.01 seconds