Percona Xtradb Cluster and Proxysql

192.168.2.78 dbnode1.db node1

192.168.2.233 dbnode2.db node2

192.168.2.167 dbnode3.db node3

192.168.2.232 dbnode4.db proxysql

Percona xtradb cluster 8

ProxySQL version 2.5.4-percona-1.1

Install percona xtradb cluster 8 in node1, node2, node3

# yum install https://repo.percona.com/yum/percona-release-latest.noarch.rpm

# percona-release enable-only pxc-80 release

# percona-release enable tools release

# yum module disable mysql -y

# yum install percona-xtradb-cluster

Then, start service mysql in node1, node2 and node3

# service mysql start

Find temporary password in mysqld.log

# grep 'temporary password' /var/log/mysqld.log

# mysql -u root -p

After login, you must reset root password with your own password.

MySQL> ALTER USER 'root'@'localhost' IDENTIFIED BY 'Percona@pxc8';

Then, Verify wsrep parameters in the database.

MySQL> show variables like '%wsrep%';

Before configure node1 for PXC Write-Set Replication (WSP), please stop mysql services.

# service mysql stop

Update file my.cnf with custom values according to your requirement.

# vim /etc/my.cnf

[mysqld]

server-id=1

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

# Binary log expiration period is 604800 seconds, which equals 7 days

binlog_expire_logs_seconds=604800

######## wsrep ###############

# Path to Galera library

wsrep_provider=/usr/lib64/galera4/libgalera_smm.so

# Cluster connection URL contains IPs of nodes

#If no IP is found, this implies that a new cluster needs to be created,

#in order to do that you need to bootstrap this node

wsrep_cluster_address=gcomm://192.168.2.78,192.168.2.233,192.168.2.167

# In order for Galera to work correctly binlog format should be ROW

binlog_format=ROW

# Slave thread to use

wsrep_slave_threads=8

wsrep_log_conflicts

# This changes how InnoDB autoincrement locks are managed and is a requirement for Galera

innodb_autoinc_lock_mode=2

# Node IP address

wsrep_node_address=192.168.2.78

# Cluster name

wsrep_cluster_name=pxc-cluster

#If wsrep_node_name is not specified, then system hostname will be used

wsrep_node_name=dbnode1.db

#pxc_strict_mode allowed values: DISABLED,PERMISSIVE,ENFORCING,MASTER

pxc_strict_mode=PERMISSIVE

pxc_encrypt_cluster_traffic=OFF

# SST method

wsrep_sst_method=xtrabackup-v2

Start mysql in node1 and bootstrap the cluster

# systemctl start mysql@bootstrap.service

# systemctl status mysql@bootstrap.service

# tail -f /var/log/mysqld.log

Configure percona xtradb in node2 and node3

Before configure please stop mysql service in node2

# service mysql stop

Then edit value in file my.cnf

# vim /etc/my.cnf

[mysqld]

server-id=1

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

# Binary log expiration period is 604800 seconds, which equals 7 days

binlog_expire_logs_seconds=604800

######## wsrep ###############

# Path to Galera library

wsrep_provider=/usr/lib64/galera4/libgalera_smm.so

# Cluster connection URL contains IPs of nodes

#If no IP is found, this implies that a new cluster needs to be created,

#in order to do that you need to bootstrap this node

wsrep_cluster_address=gcomm://192.168.2.78,192.168.2.233,192.168.2.167

# In order for Galera to work correctly binlog format should be ROW

binlog_format=ROW

# Slave thread to use

wsrep_slave_threads=8

wsrep_log_conflicts

# This changes how InnoDB autoincrement locks are managed and is a requirement for Galera

innodb_autoinc_lock_mode=2

# Node IP address

wsrep_node_address=192.168.2.233

# Cluster name

wsrep_cluster_name=pxc-cluster

#If wsrep_node_name is not specified, then system hostname will be used

wsrep_node_name=dbnode2.db

#pxc_strict_mode allowed values: DISABLED,PERMISSIVE,ENFORCING,MASTER

pxc_strict_mode=PERMISSIVE

pxc_encrypt_cluster_traffic=OFF

# SST method

wsrep_sst_method=xtrabackup-v2

After finish configure, start service mysql in node2

# service mysql start

Then config in node3

Please stop service mysql in node3

# service mysql stop

# vim /etc/my.cnf

[mysqld]

server-id=1

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

# Binary log expiration period is 604800 seconds, which equals 7 days

binlog_expire_logs_seconds=604800

######## wsrep ###############

# Path to Galera library

wsrep_provider=/usr/lib64/galera4/libgalera_smm.so

# Cluster connection URL contains IPs of nodes

#If no IP is found, this implies that a new cluster needs to be created,

#in order to do that you need to bootstrap this node

wsrep_cluster_address=gcomm://192.168.2.78,192.168.2.233,192.168.2.167

# In order for Galera to work correctly binlog format should be ROW

binlog_format=ROW

# Slave thread to use

wsrep_slave_threads=8

wsrep_log_conflicts

# This changes how InnoDB autoincrement locks are managed and is a requirement for Galera

innodb_autoinc_lock_mode=2

# Node IP address

wsrep_node_address=192.168.2.167

# Cluster name

wsrep_cluster_name=pxc-cluster

#If wsrep_node_name is not specified, then system hostname will be used

wsrep_node_name=dbnode3.db

#pxc_strict_mode allowed values: DISABLED,PERMISSIVE,ENFORCING,MASTER

pxc_strict_mode=PERMISSIVE

pxc_encrypt_cluster_traffic=OFF

# SST method

wsrep_sst_method=xtrabackup-v2

After finish configure, start service mysql in node3

# systemctl start mysql

Then, you can check node for cluster in all node.

mysql> select * from mysql.wsrep_cluster_members;

+--------------------------------------+--------------------------------------+------------+-----------------------+

+--------------------------------------+--------------------------------------+------------+-----------------------+

+--------------------------------------+--------------------------------------+------------+-----------------------+

3 rows in set (0.00 sec)

Proxysql setup

Install proxysql in node4

# yum install proxysql2

# yum install percona-xtradb-cluster-client

Check file configuration in proxysql make sure file configuration available.

# cat /etc/proxysql.cnf

# proxysql --version

Start service proxysql in node4

# service proxysql start

# service proxysql status

Check log in proxysql

# tail -f /var/lib/proxysql/proxysql.log

First step connect to proxysql administration with default password ‘admin’

# mysql -u admin -padmin -h 127.0.0.1 -P6032 --prompt='ProxySQLAdmin> '

Then, if you change proxysql administration password

ProxySQLAdmin> UPDATE global_variables SET variable_value='admin:password' WHERE variable_name='admin-admin_credentials';

To copy the memory setting to the runtime

ProxySQLAdmin> LOAD ADMIN VARIABLES TO RUNTIME;

Save variable to disk to make them persist

ProxySQLAdmin> SAVE ADMIN VARIABLES TO DISK;

Verify that the configuration is empty by checking that there are no entries in mysql_servers, mysql_users, mysql_replication_hostgroups and mysql_query_rules table

ProxySQLAdmin> SELECT * FROM mysql_servers;

ProxySQLAdmin> SELECT * FROM mysql_users;

ProxySQLAdmin> SELECT * from mysql_replication_hostgroups;

ProxySQLAdmin> SELECT * from mysql_query_rules;

Next, add backend database nodes to the proxysql server pool

Insert 3 node percona xtradb cluster to the mysql_servers table.

ProxySQLAdmin> INSERT INTO mysql_servers (hostname,hostgroup_id,port,weight) VALUES ('192.168.2.78',10,3306,1000);

ProxySQLAdmin> INSERT INTO mysql_servers (hostname,hostgroup_id,port,weight) VALUES ('192.168.2.233',10,3306,1000);

ProxySQLAdmin> INSERT INTO mysql_servers (hostname,hostgroup_id,port,weight) VALUES ('192.168.2.167',10,3306,1000);

ProxySQLAdmin> INSERT INTO mysql_galera_hostgroups (writer_hostgroup, backup_writer_hostgroup, reader_hostgroup, offline_hostgroup, active, max_writers, writer_is_also_reader,max_transactions_behind) VALUES (10, 12, 11, 13, 1, 1, 2, 100);

Activate current in memory mysql server and replication hostgroup configuration

ProxySQLAdmin> LOAD MYSQL SERVERS TO RUNTIME;

Save the current in memory mysql server and replication hostgroup configuration to disk

ProxySQLAdmin> SAVE MYSQL SERVERS TO DISK;

next configure check hostgroup, hostname and status server

ProxySQLAdmin> SELECT hostgroup_id, hostname, status FROM runtime_mysql_servers;

Configure mysql_users in proxysql

After configure mysql server, next step you will configure mysql users with specific username, password and default hostgroup for basic configuration

ProxySQLAdmin> INSERT INTO mysql_users (username,password,default_hostgroup) VALUES ('sbuser','sbpass',10);

Active current in mysql user configuration

ProxySQLAdmin> LOAD MYSQL USERS TO RUNTIME;

Save the current in memory mysql user configuration to disk

ProxySQLAdmin> SAVE MYSQL USERS TO DISK;

Create the user in mysql connect to the primary and execute query :

ProxySQLAdmin> UPDATE global_variables SET variable_value='monitor' WHERE variable_name in ('mysql-monitor_username','mysql-monitor_password');

On percona xtradb cluster add monitoring user and grant user :

mysql> CREATE USER 'monitor'@'%' IDENTIFIED BY 'monitor';

mysql> GRANT USAGE ON *.* TO 'monitor'@'%';

mysql> select user, host, super_priv, password_expired, plugin from mysql.user;

Create database sbtest and add grant user sbuser in mysql

mysql> CREATE DATABASE sbtest;

mysql> CREATE USER 'sbuser'@'192.168.2.232' IDENTIFIED WITH mysql_native_password BY 'sbpass';

mysql> GRANT ALL ON *.* TO 'sbuser'@'192.168.2.232';

Configuring monitoring in proxysql

ProxySQLAdmin> UPDATE global_variables SET variable_value='monitor' WHERE variable_name in ('mysql-monitor_username','mysql-monitor_password');

ProxySQLAdmin> UPDATE GLOBAL_VARIABLES SET variable_value='8.0' WHERE variable_name='mysql-server_version';

ProxySQLAdmin> UPDATE global_variables SET variable_value='2000' WHERE variable_name IN ('mysql-monitor_connect_interval','mysql-monitor_ping_interval','mysql-monitor_read_only_interval');

ProxySQLAdmin> UPDATE GLOBAL_VARIABLES SET variable_value='true' WHERE variable_name='admin-web_enabled';

ProxySQLAdmin> SELECT * FROM global_variables WHERE variable_name LIKE 'mysql-monitor_%';

Active current in memory mysql variable configuration

ProxySQLAdmin> LOAD MYSQL VARIABLES TO RUNTIME;

Save the current in memory mysql variable configuration to disk

ProxySQLAdmin> SAVE MYSQL VARIABLES TO DISK;

After that configuration is active verify the status mysql backend in the monitor database proxysql.

ProxySQLAdmin> SELECT * FROM monitor.mysql_server_connect_log ORDER BY time_start_us DESC limit 10;

ProxySQLAdmin> SELECT * FROM monitor.mysql_server_ping_log ORDER BY time_start_us DESC limit 10;

In mysql 8.0 doesnt support caching_sha2_password

ProxySQLAdmin> select * from global_variables where variable_name like '%hash_passwords%';

+----------------------+----------------+

| variable_name | variable_value |

+----------------------+----------------+

| admin-hash_passwords | true |

+----------------------+----------------+

1 row in set (0.01 sec)

Update the variable admin-hash_password

ProxySQLAdmin> update global_variables set variable_value='false' where variable_name='admin-hash_passwords';

ProxySQLAdmin> load admin variables to runtime; save admin variables to disk;

ProxySQLAdmin> load mysql users to runtime; save mysql users to disk;

Once configuration active please verify the status mysql backend in monitor database tables in proxysql

ProxySQLAdmin> SELECT * FROM monitor.mysql_server_connect_log ORDER BY time_start_us DESC limit 10;

+---------------+------+------------------+-------------------------+---------------+

+---------------+------+------------------+-------------------------+---------------+

| 192.168.2.233 | 3306 | 1695972747381302 | 3201 | NULL |

| 192.168.2.167 | 3306 | 1695972747355282 | 3087 | NULL |

| 192.168.2.78 | 3306 | 1695972747329345 | 3257 | NULL |

| 192.168.2.167 | 3306 | 1695972745375191 | 3018 | NULL |

| 192.168.2.78 | 3306 | 1695972745351649 | 2302 | NULL |

| 192.168.2.233 | 3306 | 1695972745328067 | 2552 | NULL |

| 192.168.2.78 | 3306 | 1695972743372913 | 3264 | NULL |

| 192.168.2.233 | 3306 | 1695972743349814 | 3679 | NULL |

| 192.168.2.167 | 3306 | 1695972743327035 | 3252 | NULL |

| 192.168.2.167 | 3306 | 1695972741367702 | 1653 | NULL |

+---------------+------+------------------+-------------------------+---------------+

ProxySQLAdmin> SELECT * FROM monitor.mysql_server_ping_log ORDER BY time_start_us DESC limit 10;

+---------------+------+------------------+----------------------+------------+

+---------------+------+------------------+----------------------+------------+

| 192.168.2.233 | 3306 | 1695972753337036 | 712 | NULL |

| 192.168.2.78 | 3306 | 1695972753336971 | 667 | NULL |

| 192.168.2.167 | 3306 | 1695972753336757 | 780 | NULL |

| 192.168.2.167 | 3306 | 1695972751335770 | 417 | NULL |

| 192.168.2.78 | 3306 | 1695972751335676 | 428 | NULL |

| 192.168.2.233 | 3306 | 1695972751335567 | 660 | NULL |

| 192.168.2.78 | 3306 | 1695972749335510 | 664 | NULL |

| 192.168.2.233 | 3306 | 1695972749335434 | 618 | NULL |

| 192.168.2.167 | 3306 | 1695972749335133 | 735 | NULL |

| 192.168.2.78 | 3306 | 1695972747333963 | 620 | NULL |

+---------------+------+------------------+----------------------+------------+

Please running command to access mysql from proxysql

# mysql -usbuser -psbpass -h 127.0.0.1 -P6033 --prompt='ProxySQLClient> '

# mysql -usbuser -psbpass -h 127.0.0.1 -P6033 --prompt='ProxySQLClient> ' -e 'select @@hostname,@@port';

Source :

https://satya-dba.blogspot.com/2021/08/installing-percona-xtradb-cluster.html

https://satya-dba.blogspot.com/2021/09/installing-proxysql-configuration.html

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