The ProxySQL Admin (proxysql-admin) solution configures Percona XtraDB cluster nodes into ProxySQL.
Please log ProxySQL Admin bug reports here https://jira.percona.com/projects/PSQLADM.
proxysql-admin usage info
Usage: [ options ]
Options:
--config-file Read login credentials from a configuration file (overrides any login credentials specified on the command line)
--quick-demo Setup a quick demo with no authentication
--proxysql-datadir=<datadir> Specify proxysql data directory location
--proxysql-username=user_name Username for connecting to the ProxySQL service
--proxysql-password[=password] Password for connecting to the ProxySQL service
--proxysql-port=port_num Port Nr. for connecting to the ProxySQL service
--proxysql-hostname=host_name Hostname for connecting to the ProxySQL service
--cluster-username=user_name Username for connecting to the Percona XtraDB Cluster node
--cluster-password[=password] Password for connecting to the Percona XtraDB Cluster node
--cluster-port=port_num Port Nr. for connecting to the Percona XtraDB Cluster node
--cluster-hostname=host_name Hostname for connecting to the Percona XtraDB Cluster node
--cluster-app-username=user_name Application username for connecting to the Percona XtraDB Cluster node
--cluster-app-password[=password] Application password for connecting to the Percona XtraDB Cluster node
--without-cluster-app-user Configure Percona XtraDB Cluster without application user
--monitor-username=user_name Username for monitoring Percona XtraDB Cluster nodes through ProxySQL
--monitor-password[=password] Password for monitoring Percona XtraDB Cluster nodes through ProxySQL
--enable, -e Auto-configure Percona XtraDB Cluster nodes into ProxySQL
--disable, -d Remove any Percona XtraDB Cluster configurations from ProxySQL
--node-check-interval=3000 Interval for monitoring node checker script (in milliseconds)
--mode=[loadbal|singlewrite] ProxySQL read/write configuration mode, currently supporting: 'loadbal' and 'singlewrite' (the default) modes
--write-node=host_name:port Writer node to accept write statments. This option is supported only when using --mode=singlewrite
Can accept comma delimited list with the first listed being the highest priority.
--include-slaves=host_name:port Add specified slave node(s) to ProxySQL, these nodes will go into the reader hostgroup and will only be put into
the writer hostgroup if all cluster nodes are down. Slaves must be read only. Can accept comma delimited list.
If this is used make sure 'read_only=1' is in the slave's my.cnf
--adduser Adds the Percona XtraDB Cluster application user to the ProxySQL database
--syncusers Sync user accounts currently configured in MySQL to ProxySQL (deletes ProxySQL users not in MySQL)
--version, -v Print version info- ProxySQL and Cluster should be up and running.
- For security purposes, please ensure to change the default user settings in the ProxySQL configuration file.
- ProxySQL configuration file(/etc/proxysql-admin.cnf)
# proxysql admin interface credentials.
export PROXYSQL_DATADIR='/var/lib/proxysql'
export PROXYSQL_USERNAME='admin'
export PROXYSQL_PASSWORD='admin'
export PROXYSQL_HOSTNAME='localhost'
export PROXYSQL_PORT='6032'
# PXC admin credentials for connecting to pxc-cluster-node.
export CLUSTER_USERNAME='admin'
export CLUSTER_PASSWORD='admin'
export CLUSTER_HOSTNAME='localhost'
export CLUSTER_PORT='3306'
# proxysql monitoring user. proxysql admin script will create this user in pxc to monitor pxc-nodes.
export MONITOR_USERNAME='monitor'
export MONITOR_PASSWORD='monit0r'
# Application user to connect to pxc-node through proxysql
export CLUSTER_APP_USERNAME='proxysql_user'
export CLUSTER_APP_PASSWORD='passw0rd'
# ProxySQL read/write hostgroup
export WRITE_HOSTGROUP_ID='10'
export READ_HOSTGROUP_ID='11'
# ProxySQL read/write configuration mode.
export MODE="singlewrite"
# ProxySQL Cluster Node Priority File
export HOST_PRIORITY_FILE=$PROXYSQL_DATADIR/host_priority.confIt is recommend you use --config-file to run this proxysql-admin script.
This script will accept two different options to configure Cluster nodes
1) --enable
This option will configure Cluster nodes into the ProxySQL database, and add cluster monitoring script into the ProxySQL scheduler table for checking the cluster status.
scheduler script info :
- proxysql_galera_checker : will check desynced nodes, and temporarily deactivate them. This will also call proxysql_node_monitor script to check cluster node membership, and re-configure ProxySQL if cluster membership changes occur
Note:
As proxysql_galera_check runs in regular intervals, there is the possibility of a race
condition in certain circumstances, for example starting this script twice or more at the
same time. To avoid such situations from occuring, a Galera process identifier check file
was added, which will prevent duplicate script execution in most cases. Still, it may be
possible in some rare cases to circumvent this check if you execute more then one copy of
proxysql_galera_check simultaneously. Please note that running more then one copy of
proxysql_galera_check in the same runtime environment at the same time is not supported,
and may lead to undefined behavior.
It will also add two new users into the Percona XtraDB Cluster with the USAGE privilege; one is for monitoring cluster nodes through ProxySQL, and another is for connecting to Cluster node via the ProxySQL console.
Note: Please make sure to use super user credentials from Percona XtraDB Cluster to setup the default users.
$ sudo proxysql-admin --config-file=/etc/proxysql-admin.cnf --enable
This script will assist with configuring ProxySQL (currently only Percona XtraDB cluster in combination with ProxySQL is supported)
ProxySQL read/write configuration mode is singlewrite
Configuring ProxySQL monitoring user..
ProxySQL monitor username as per command line/config-file is monitor
User 'monitor'@'127.%' has been added with USAGE privilege
Configuring the Percona XtraDB Cluster application user to connect through ProxySQL
Percona XtraDB Cluster application username as per command line/config-file is proxysql_user
Percona XtraDB Cluster application user 'proxysql_user'@'127.%' has been added with the USAGE privilege, please make sure to the grant appropriate privileges
Adding the Percona XtraDB Cluster server nodes to ProxySQL
You have not given the writer node info through the command line or in the config-file. Please enter the writer-node info (eg : 127.0.0.1:3306): 127.0.0.1:25000
ProxySQL configuration completed!
ProxySQL has been successfully configured to use with Percona XtraDB Cluster
You can use the following login credentials to connect your application through ProxySQL
mysql --user=proxysql_user --password=***** --host=127.0.0.1 --port=6033 --protocol=tcp
$
mysql> select hostgroup_id,hostname,port,status,comment from mysql_servers;
+--------------+-----------+-------+--------+---------+
| hostgroup_id | hostname | port | status | comment |
+--------------+-----------+-------+--------+---------+
| 11 | 127.0.0.1 | 25400 | ONLINE | READ |
| 10 | 127.0.0.1 | 25000 | ONLINE | WRITE |
| 11 | 127.0.0.1 | 25100 | ONLINE | READ |
| 11 | 127.0.0.1 | 25200 | ONLINE | READ |
| 11 | 127.0.0.1 | 25300 | ONLINE | READ |
+--------------+-----------+-------+--------+---------+
5 rows in set (0.00 sec)
mysql> 2) --disable
This option will remove Percona XtraDB Cluster nodes from ProxySQL and stop the ProxySQL monitoring daemon.
$ proxysql-admin --config-file=/etc/proxysql-admin.cnf --disable
ProxySQL configuration removed!
$
Extra options
i) --mode
This option allows you to setup read/write mode for cluster nodes in ProxySQL database based on the hostgroup. For now, the only supported modes are loadbal and singlewrite. singlewrite is the default mode, and it will configure Percona Cluster to only accept writes on one single node only. All other remaining nodes will be read-only and accept only read statements.
With --write-node option we can control a priority order of what host is most desired to be the writer at any given time. When used the feature will create the config file which is by default "/var/lib/proxysql/host_priority.conf", this is configurable in proxysql-admin.cnf. Servers can be specified comma delimited - 10.0.0.51:3306, 10.0.0.52:3306 - The 51 node will always be in the writer hostgroup if it is ONLINE, if it is OFFLINE the 52 node will go into the writer hostgroup, and if it goes down a node from the remaining nodes will be randomly chosen for the writer hostgroup. This new config file will be deleted when --disable is used. This will ensure a specified writer-node will always be the writer node while it is ONLINE.
The mode loadbal on the other hand is a load balanced set of evenly weighted read/write nodes.
singlewrite mode setup:
$ sudo grep "MODE" /etc/proxysql-admin.cnf
export MODE="singlewrite"
$
$ sudo proxysql-admin --config-file=/etc/proxysql-admin.cnf --write-node=127.0.0.1:25000 --enable
ProxySQL read/write configuration mode is singlewrite
[..]
ProxySQL configuration completed!
$
mysql> select hostgroup_id,hostname,port,status,comment from mysql_servers;
+--------------+-----------+-------+--------+---------+
| hostgroup_id | hostname | port | status | comment |
+--------------+-----------+-------+--------+---------+
| 11 | 127.0.0.1 | 25400 | ONLINE | READ |
| 10 | 127.0.0.1 | 25000 | ONLINE | WRITE |
| 11 | 127.0.0.1 | 25100 | ONLINE | READ |
| 11 | 127.0.0.1 | 25200 | ONLINE | READ |
| 11 | 127.0.0.1 | 25300 | ONLINE | READ |
+--------------+-----------+-------+--------+---------+
5 rows in set (0.00 sec)
mysql> loadbal mode setup:
$ sudo proxysql-admin --config-file=/etc/proxysql-admin.cnf --mode=loadbal --enable
This script will assist with configuring ProxySQL (currently only Percona XtraDB cluster in combination with ProxySQL is supported)
ProxySQL read/write configuration mode is loadbal
[..]
ProxySQL has been successfully configured to use with Percona XtraDB Cluster
You can use the following login credentials to connect your application through ProxySQL
mysql --user=proxysql_user --password=***** --host=127.0.0.1 --port=6033 --protocol=tcp
$
mysql> select hostgroup_id,hostname,port,status,comment from mysql_servers;
+--------------+-----------+-------+--------+-----------+
| hostgroup_id | hostname | port | status | comment |
+--------------+-----------+-------+--------+-----------+
| 10 | 127.0.0.1 | 25400 | ONLINE | READWRITE |
| 10 | 127.0.0.1 | 25000 | ONLINE | READWRITE |
| 10 | 127.0.0.1 | 25100 | ONLINE | READWRITE |
| 10 | 127.0.0.1 | 25200 | ONLINE | READWRITE |
| 10 | 127.0.0.1 | 25300 | ONLINE | READWRITE |
+--------------+-----------+-------+--------+-----------+
5 rows in set (0.01 sec)
mysql> ii) --node-check-interval
This option configures the interval for monitoring via the proxysql_galera_checker script (in milliseconds)
$ proxysql-admin --config-file=/etc/proxysql-admin.cnf --node-check-interval=5000 --enableiii) --adduser
This option will aid with adding the Cluster application user to ProxySQL database for you
$ proxysql-admin --config-file=/etc/proxysql-admin.cnf --adduser
Adding Percona XtraDB Cluster application user to ProxySQL database
Enter Percona XtraDB Cluster application user name: root
Enter Percona XtraDB Cluster application user password:
Added Percona XtraDB Cluster application user to ProxySQL database!
$ iv) --syncusers
This option will sync user accounts currently configured in Percona XtraDB cluster to ProxySQL database except password less users and user admin. It also deletes ProxySQL users not in Percona XtraDB cluster from ProxySQL database.
$ /usr/bin/proxysql-admin --syncusers
Syncing user accounts from Percona XtraDB Cluster to ProxySQL
Synced Percona XtraDB Cluster users to the ProxySQL database!
$
From ProxySQL DB
mysql> select username from mysql_users;
+---------------+
| username |
+---------------+
| monitor |
| one |
| proxysql_user |
| two |
+---------------+
4 rows in set (0.00 sec)
mysql>
From PXC
mysql> select user,host from mysql.user where authentication_string!='' and user not in ('admin','mysql.sys');
+---------------+-------+
| user | host |
+---------------+-------+
| monitor | 192.% |
| proxysql_user | 192.% |
| two | % |
| one | % |
+---------------+-------+
4 rows in set (0.00 sec)
mysql>
v) --quick-demo
This option is used to setup dummy proxysql configuration.
$ sudo proxysql-admin --enable --quick-demo
You have selected the dry test run mode. WARNING: This will create a test user (with all privileges) in the Percona XtraDB Cluster & ProxySQL installations.
You may want to delete this user after you complete your testing!
Would you like to proceed with '--quick-demo' [y/n] ? y
Setting up proxysql test configuration!
Do you want to use the default ProxySQL credentials (admin:admin:6032:127.0.0.1) [y/n] ? y
Do you want to use the default Percona XtraDB Cluster credentials (root::3306:127.0.0.1) [y/n] ? n
Enter the Percona XtraDB Cluster username (super user): root
Enter the Percona XtraDB Cluster user password:
Enter the Percona XtraDB Cluster port: 25100
Enter the Percona XtraDB Cluster hostname: localhost
ProxySQL read/write configuration mode is singlewrite
Configuring ProxySQL monitoring user..
User 'monitor'@'127.%' has been added with USAGE privilege
Configuring the Percona XtraDB Cluster application user to connect through ProxySQL
Percona XtraDB Cluster application user 'pxc_test_user'@'127.%' has been added with ALL privileges, this user is created for testing purposes
Adding the Percona XtraDB Cluster server nodes to ProxySQL
ProxySQL configuration completed!
ProxySQL has been successfully configured to use with Percona XtraDB Cluster
You can use the following login credentials to connect your application through ProxySQL
mysql --user=pxc_test_user --host=127.0.0.1 --port=6033 --protocol=tcp
$
mysql> select hostgroup_id,hostname,port,status,comment from mysql_servers;
+--------------+-----------+-------+--------+---------+
| hostgroup_id | hostname | port | status | comment |
+--------------+-----------+-------+--------+---------+
| 11 | 127.0.0.1 | 25300 | ONLINE | READ |
| 10 | 127.0.0.1 | 25000 | ONLINE | WRITE |
| 11 | 127.0.0.1 | 25100 | ONLINE | READ |
| 11 | 127.0.0.1 | 25200 | ONLINE | READ |
+--------------+-----------+-------+--------+---------+
4 rows in set (0.00 sec)
mysql>
vi) --include-slaves=host_name:port
This option will help us to include specified slave node(s) to ProxySQL database. These nodes will go into the reader hostgroup and will only be put into the writer hostgroup if all cluster nodes are down. Slaves must be read only. Can accept comma delimited list. If this is used make sure 'read_only=1' is in the slave's my.cnf.
PS : With loadbal mode slave hosts only accepts read/write requests when all cluster nodes are down.
Simple script to dump ProxySQL config and stats
Usage:
proxysql-status admin admin 127.0.0.1 6032