The following article show how to setup a 2 machine PerconaDB XtraDB cluster on CentOS 6
Lets assume there are 2 machines
- 10.10.10.76
- 10.10.10.77
Installation
The installation procedure is the same for both the machines.Let us add the PerconaDB and EPEL repositories. We are adding the EPEL repository here, as the dependencies of PerconaDB are fetched from here.
rpm -ivh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
rpm -Uhv http://www.percona.com/downloads/percona-release/percona-release-0.0-1.x86_64.rpm
Let’s install the required packages by running the following Yum command.
yum install Percona-XtraDB-Cluster-server-55 Percona-XtraDB-Cluster-client-55 Percona-XtraDB-Cluster-galera-2
First node configuration
Let us edit the following lines in the file /etc/my.cnf.
[mysqld] datadir=/var/lib/mysql user=mysql # Path to Galera library wsrep_provider=/usr/lib64/libgalera_smm.so # Cluster connection URL contains the IPs of node#1, node#2 and node#3 wsrep_cluster_address=gcomm://10.10.10.76,10.10.10.77 # In order for Galera to work correctly binlog format should be ROW binlog_format=ROW # MyISAM storage engine has only experimental support default_storage_engine=InnoDB # This changes how InnoDB autoincrement locks are managed and is a requirement for Galera innodb_autoinc_lock_mode=2 # Node #1 address wsrep_node_address=10.10.10.76 # SST method wsrep_sst_method=rsync128.199.127.177 # Cluster name wsrep_cluster_name=my_centos_cluster
Bootstapping the first node
The initial node needs to bootstrapped. We need to run the following command to do that.
/etc/init.d/mysql bootstrap-pxc
Second node configuration
Let us edit the following lines in the file /etc/my.cnf.
[mysqld] datadir=/var/lib/mysql user=mysql # Path to Galera library wsrep_provider=/usr/lib64/libgalera_smm.so # Cluster connection URL contains IPs of node#1, node#2 and node#3 wsrep_cluster_address=gcomm://10.10.10.76,10.10.10.77 # In order for Galera to work correctly binlog format should be ROW binlog_format=ROW # MyISAM storage engine has only experimental support default_storage_engine=InnoDB # This changes how InnoDB autoincrement locks are managed and is a requirement for Galera innodb_autoinc_lock_mode=2 # Node #2 address wsrep_node_address=10.10.10.77 # Cluster name wsrep_cluster_name=my_centos_cluster
Adding the second node to the cluster
Let’s run the following command to start mysql service
service mysql start
Verifying the setup
We can verify whether both the machines are add to the cluster by the following commands
mysql -uroot -p mysql> show status like 'wsrep%'; +----------------------------+--------------------------------------+ | Variable_name | Value | +----------------------------+--------------------------------------+ | wsrep_local_state_uuid | e6b8ae47-2bce-11e5-9176-c2eb48accfcd | | wsrep_protocol_version | 4 | | wsrep_last_committed | 0 | | wsrep_replicated | 0 | | wsrep_replicated_bytes | 0 | | wsrep_received | 6 | | wsrep_received_bytes | 382 | | wsrep_local_commits | 0 | | wsrep_local_cert_failures | 0 | | wsrep_local_replays | 0 | | wsrep_local_send_queue | 0 | | wsrep_local_send_queue_avg | 0.000000 | | wsrep_local_recv_queue | 0 | | wsrep_local_recv_queue_avg | 0.000000 | | wsrep_flow_control_paused | 0.000000 | | wsrep_flow_control_sent | 0 | | wsrep_flow_control_recv | 0 | | wsrep_cert_deps_distance | 0.000000 | | wsrep_apply_oooe | 0.000000 | | wsrep_apply_oool | 0.000000 | | wsrep_apply_window | 0.000000 | | wsrep_commit_oooe | 0.000000 | | wsrep_commit_oool | 0.000000 | | wsrep_commit_window | 0.000000 | | wsrep_local_state | 4 | | wsrep_local_state_comment | Synced | | wsrep_cert_index_size | 0 | | wsrep_causal_reads | 0 | | wsrep_incoming_addresses | 10.10.10.77:3306,10.10.10.76:3306 | | wsrep_cluster_conf_id | 2 | | wsrep_cluster_size | 2 | | wsrep_cluster_state_uuid | e6b8ae47-2bce-11e5-9176-c2eb48accfcd | | wsrep_cluster_status | Primary | | wsrep_connected | ON | | wsrep_local_bf_aborts | 0 | | wsrep_local_index | 1 | | wsrep_provider_name | Galera | | wsrep_provider_vendor | Codership Oy | | wsrep_provider_version | 2.8(r165) | | wsrep_ready | ON | +----------------------------+--------------------------------------+ 40 rows in set (0.00 sec)
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