8.2. Preparing Nodes for Using High Availability

Before you can enable or disable high availability support on a node, you need to do the following on that node:

  1. Update Virtuozzo Storage to the latest version with yum update.

  2. Install the required packages: 

    # yum install shaman pdrs rmond @high-availability

  3. Add the following lines to the /etc/snmp/snmpd.local.conf file: 

    rwcommunity parallels 127.0.0.1 .1.3.6.1.4.1.26171
rwcommunity parallels <IP_network/subnet_mask> .1.3.6.1.4.1.26171

    where <IP_network> is the Virtuozzo Storage cluster network and <subnet_mask> covers all the nodes participating in the cluster.

  4. Start cpufeatures.timer that once per minute runs a command to sync the CPU feature mask and VM configurations: 

    # systemctl start cpufeatures.timer

    Note

    Note: The timer also starts automatically after server reboot.

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