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Galera Cluster is a high availability and high scalability solution for MySQL clustering.

Galera Cluster is a high availability and high scalability solution for
MySQL clustering.

Galera Cluster integrates MySQL with the Galera library of MySQL high availability solutions in a single product package which enables you to create a cost-effective MySQL cluster.

This charm deploys Galera Cluster onto Ubuntu.


WARNING: Its critical that you follow the bootstrap process detailed in this
document in order to end up with a running Active/Active Galera Cluster.

The following configuration parameters are required:

    root-password - Due to the multi-master nature of Galera Cluster, the root-password
    needs to be specified in advance so that all nodes have the same root password.

    sst-password - This password is used as a shared secret between nodes when performing
    whole-database transfers between nodes during node deployment.
Proxy Configuration

If you are deploying this charm on MAAS or in an environment without direct
access to the internet, you will need to allow access to releases.galeracluster.com
as the charm installs packages directly from the Galera repositories. If you
are using squid-deb-proxy, follow the steps below:

echo "releases.galeracluster.com" | sudo tee /etc/squid-deb-proxy/mirror-dstdomain.acl.d/40-galera
sudo service squid-deb-proxy restart


Read also: 35 Cools Applications to install on the most popular Linux distribution: Ubuntu (Chapter V).

The first service unit deployed acts as the seed node for the rest of the
cluster; in order for the cluster to function correctly, the same MySQL passwords must be used across all nodes:

cat > galera.yaml << EOF
    root-password: my-root-password
    sst-password: my-sst-password

Once you have created this file, you can deploy the first seed unit:

juju deploy --config galera.yaml cs:~codership/galera-cluster

Once this node is full operational, you can add extra units one at a time to the

juju add-unit galera-cluster

A minimum cluster size of three units is recommended.

In order to access the cluster, you can use the hacluster charm in multicast-capable deployments to provide a single IP address:

juju set galera-cluster vip=
juju deploy hacluster
juju add-relation hacluster galera-cluster

Clients can then access using the vip provided. This vip will be passed to
related services:

juju add-relation keystone galera-cluster


Note that Galera Cluster is not a 'scale-out' MySQL solution; reads
and writes are channeled through a single service unit and synchronously
replicated to other nodes in the cluster; reads/writes are as slow as the
slowest node you have in your deployment.



                                Network interface on which to place the Virtual IP


                                Root password for MySQL access; must be configured pre-deployment for Active-Active clusters.


                                Package install location for Galera Cluster (defaults to distro for >= 14.04)


                                Turns on innodb_file_per_table option, which will make MySQL put each
    InnoDB table into separate .idb file. Existing InnoDB tables will remain
    in ibdata1 file - full dump/import is needed to get rid of large
    ibdata1 file



                                Netmask that will be used for the Virtual IP


                                Re-sync account password for new cluster nodes; must be configured pre-deployment for Active-Active clusters.


                                The IP address and netmask of the 'access' network (e.g.,
    This network will be used for access to database services.



                                Virtual IP to use to front Galera Cluster in active/active HA configuration


                                Default multicast port number that will be used to communicate between HA Cluster nodes.


                                Maximum connections to allow. -1 means use the server's compiled in default.


                                If True enables IPv6 support. The charm will expect network interfaces
    to be configured with an IPv6 address. If set to False (default) IPv4
    is expected.
    NOTE: these charms do not currently support IPv6 privacy extension. In
    order for this charm to function correctly, the privacy extension must be
    disabled and a non-temporary address must be configured/available on
    your network interface.



                                How much data do you want to keep in memory in the DB. This will be used to tune settings in the database server appropriately. Suffix this value with 'K','M','G', or 'T' to get the relevant kilo/mega/etc. bytes. If suffixed with %, one will get that percentage of RAM devoted to dataset.


                                Default network interface on which HA cluster will bind to communication with the other members of the HA Cluster.


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About Hugo Repetto

Ubuntu is a Linux distribution that offers an operating system predominantly focused on desktop computers but also provides support for servers. Based on Debian GNU / Linux, Ubuntu focuses on ease of use, freedom in usage restriction, regular releases (every 6 months) and ease of installation.
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