====== Пакет Corosync ======

  * Corosync provides reliable communication between nodes, manages cluster membership and determines quorum
  * [[https://www.digitalocean.com/community/tutorials/how-to-create-a-high-availability-setup-with-corosync-pacemaker-and-floating-ips-on-ubuntu-14-04|How To Create a High Availability Setup with Corosync, Pacemaker, and Floating IPs on Ubuntu 14.04]]


===== Установка =====
<code>
nodeN# apt install corosync
</code>

===== Настройка =====



==== Corosync 3 (Debian/Ubuntu) ====

<code>
nodeN# cat /etc/corosync/corosync.conf
</code><code>
totem {
        version: 2
        cluster_name: debian
        crypto_cipher: none
        crypto_hash: none
}

quorum {
       provider: corosync_votequorum
       two_node: 1
}

nodelist {
        node {
                name: node1
                nodeid: 1
                #ring1_addr: 10.M.N.100+X
                ring0_addr: node1
        }
        node {
                name: node2
                nodeid: 2
                #ring1_addr: 10.M.N.200+X
                ring0_addr: node2
        }
}

</code>

==== Перезапуск ====
<code>
nodeN# corosync -t

nodeN# service corosync restart
</code>

===== Отладка =====

<code>
nodeN# corosync-cfgtool -s

nodeN# corosync-cmapctl | grep members

nodeN# grep corosync /var/log/syslog
</code>

===== Дополнительные материалы =====

==== Corosync 2 (Debian 9) ====

<code>
nodeN# cat /etc/corosync/corosync.conf
</code><code>
...
                bindnetaddr: 10.M.N.0
...
                mcastaddr: 239.255.1.X
...
</code>