Créer un cluster HA avec corosync¶

Installation sur Debian¶

apt install corosync pacemaker crmsh

Création de la clé d'authentification¶

corosync-keygen

La clé est généré dans /etc/corosync/authkey , il faudra la copié sur l'autres machine du nœud. scp /etc/corosync/authkey root@10.0.1.2:/etc/corosync/

Configuration de Corosync¶

rm /etc/corosync/corosync.conf && vi /etc/corosync/corosync.conf

totem {
    version: 2
    cluster_name: cluster_web
    crypto_cipher: aes256
    crypto_hash: sha1
    clear_node_high_bit:yes
}

logging {
    fileline: off
    to_logfile: yes
    logfile: /var/log/corosync/corosync.log
    to_syslog: no
    debug: off
    timestamp: on

    logger_subsys {
        subsys: QUORUM
        debug: off
    }
}

quorum {
    provider: corosync_votequorum
    expected_votes: 2
    two_nodes: 1
}

nodelist {
    node {
        name: serv1
        nodeid: 1
        ring0_addr: 10.0.1.1
    }
    node {
        name: serv2
        nodeid: 2
        ring0_addr: 10.0.1.2
    }
}

service {
    ver: 0
    name: pacemaker
}

/etc/init.d/corosync restart
/etc/init.d/pacemaker restart
scp /etc/corosync/corosync.conf root@10.0.1.2:/etc/corosync/

Sur srv2

/etc/init.d/corosync restart
/etc/init.d/pacemaker restart

Affichage du status de corosync¶

corosync-cfgtool -s

root@srv1:~# corosync-cfgtool -s
 Local node ID 1, transport knet
 LINK ID 0
        addr =          10.0.1.1
        status:
        nodeid:   1:    localhost
        nodeid:   2:    connected

Désactivation de STONITH¶

A faire sur tous les serveurs crm configure property stonith-enabled=false

Désactiver Quorum (seulement quand il y a que 2 serveurs)¶

crm configure property no-quorum-policy="ignore"

Activation / Désactivation d'un node¶

crm node standby crm node online