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This is an Enterprise-only feature. Please install KubeDB Enterprise Edition to try this feature.

Reconfigure ProxySQL Cluster Database

This guide will show you how to use KubeDB Enterprise operator to reconfigure a ProxySQL Cluster.

Before You Begin

At first, you need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster.
Install KubeDB Community and Enterprise operator in your cluster following the steps here.
You should be familiar with the following KubeDB concepts:

To keep everything isolated, we are going to use a separate namespace called demo throughout this tutorial.

$ kubectl create ns demo
namespace/demo created

Prepare MySQL backend

We need a mysql backend for the proxysql server. So we are creating one with the below yaml.

apiVersion: kubedb.com/v1alpha2
kind: MySQL
metadata:
  name: mysql-server
  namespace: demo
spec:
  version: "5.7.36"
  replicas: 3
  topology:
    mode: GroupReplication
  storageType: Durable
  storage:
    storageClassName: "standard"
    accessModes:
      - ReadWriteOnce
    resources:
      requests:
        storage: 1Gi
  terminationPolicy: WipeOut

$ kubectl apply -f https://github.com/kubedb/docs/raw/v2023.10.9/docs/guides/proxysql/reconfigure/cluster/examples/sample-mysql.yaml
mysql.kubedb.com/mysql-server created

Let’s wait for the MySQL to be Ready.

$ kubectl get mysql -n demo 
NAME           VERSION   STATUS   AGE
mysql-server   5.7.36    Ready    3m51s

Prepare ProxySQL Cluster

Let’s create a KubeDB ProxySQL cluster with the following yaml.

apiVersion: kubedb.com/v1alpha2
kind: ProxySQL
metadata:
  name: proxy-server
  namespace: demo
spec:
  version: "2.3.2-debian"  
  replicas: 3
  backend:
    name: mysql-server
  terminationPolicy: WipeOut

$ kubectl apply -f https://github.com/kubedb/docs/raw/v2023.10.9/docs/guides/proxysql/reconfigure/cluster/examples/sample-proxysql.yaml 
proxysql.kubedb.com/proxy-server created

Let’s wait for the ProxySQL to be Ready.

$ kubectl get proxysql -ndemo               
NAME           VERSION        STATUS   AGE
proxy-server   2.3.2-debian   Ready    98s

Reconfigure MYSQL USERS

With KubeDB ProxySQL ops-request you can reconfigure mysql_users table. You can add and delete any users in the table. Also you can update any information of any user that is present in the table. To reconfigure the mysql_users table, you need to set the .spec.type to Reconfigure, provide the KubeDB ProxySQL instance name under the spec.proxyRef section and provide the desired user infos under the spec.configuration.mysqlUsers.users section. Set the .spec.configuration.mysqlUsers.reqType to either add, update or delete based on the operation you want to do. Below there are some samples for corresponding request type.

Create user in mysql database

Let’s first create two users in the backend mysql server.

$ kubectl exec -it -n demo mysql-server-0 -- bash
Defaulted container "mysql" out of: mysql, mysql-coordinator, mysql-init (init)
root@mysql-server-0:/# mysql -uroot -p$MYSQL_ROOT_PASSWORD
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 195
Server version: 5.7.36-log MySQL Community Server (GPL)

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> create user `testA`@'%' identified by 'passA';
Query OK, 0 rows affected (0.00 sec)

mysql> create user `testB`@'%' identified by 'passB';
Query OK, 0 rows affected (0.01 sec)

mysql> create database test;
Query OK, 1 row affected (0.01 sec)

mysql> grant all privileges on test.* to 'testA'@'%';
Query OK, 0 rows affected (0.00 sec)

mysql> grant all privileges on test.* to 'testB'@'%';
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql> exit
Bye

Check current mysql_users table in ProxySQL

Let’s check the current mysql_users table in the proxysql server. Make sure that the spec.syncUsers field was not set to true when the proxysql was deployed. Otherwise it will fetch all the users from the mysql backend and we won’t be able to see the effects of reconfigure users ops requests.

$ kubectl exec -it -n demo proxy-server-0 -- bash
root@proxy-server-0:/# mysql -uadmin -padmin -h127.0.0.1 -P6032 --prompt "ProxySQLAdmin > "
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MySQL connection id is 71
Server version: 8.0.27 (ProxySQL Admin Module)

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

ProxySQLAdmin > select * from mysql_users;
Empty set (0.001 sec)

Add Users

Let’s add the testA and testB user to the proxysql server with the ops-request. Make sure you have created the users in the mysql backend. As we don’t provide the password in the yaml, the KubeDB operator fetches them from the backend server. So if the user is not present in the backend server, our operator will not be able to fetch the passwords and the ops-request will be failed.

apiVersion: ops.kubedb.com/v1alpha1
kind: ProxySQLOpsRequest
metadata:
    name: add-user
    namespace: demo
spec:
    type: Reconfigure  
    proxyRef:
      name: proxy-server
    configuration:
      mysqlUsers:
        users: 
        - username: testA
          active: 1
          default_hostgroup: 2  
        - username: testB
          active: 1
          default_hostgroup: 2
        reqType: add

Let’s applly the yaml.

$ kubectl apply -f https://github.com/kubedb/docs/raw/v2023.10.9/docs/guides/proxysql/reconfigure/cluster/examples/proxyops-add-users.yaml
proxysqlopsrequest.ops.kubedb.com/add-user created

Let’s wait for the ops-request to be Successful.

$ kubectl get proxysqlopsrequest -n demo     
NAME       TYPE          STATUS       AGE
add-user   Reconfigure   Successful   20s

Now let’s check the mysql_users table in the proxysql server.

ProxySQLAdmin > select username,password,active,default_hostgroup from mysql_users;
+----------+-------------------------------------------+--------+-------------------+
| username | password                                  | active | default_hostgroup |
+----------+-------------------------------------------+--------+-------------------+
| testA    | *1BB8830D52D091A226FB7990D996CBC20F913475 | 1      | 2                 |
| testB    | *AE9C3C2838160D2591B6B15FA281CE712ABE94F0 | 1      | 2                 |
+----------+-------------------------------------------+--------+-------------------+
2 rows in set (0.001 sec)

We can see that the users has been successfuly added to the mysql_users table.

Update Users

We have successfuly added new users in the mysql_users table with proxysqlopsrequest in the last section. Now we will see how to update any user information with proxysqlopsrequest.

Suppose we want to update the active status and the default_hostgroup for the users “testA” and “testB”. We can create an ops-request like the following. As in the mysql_users table the username is the primary key, we should always provide the username in the information. To update just change the .spec.reqType to "update".

apiVersion: ops.kubedb.com/v1alpha1
kind: ProxySQLOpsRequest
metadata:
  name: update-user
  namespace: demo
spec:
  type: Reconfigure  
  proxyRef:
    name: proxy-server
  configuration:
    mysqlUsers:
      users: 
      - username: testA
        active: 0
        default_hostgroup: 3
      - username: testB
        active: 1
        default_hostgroup: 3
      reqType: update

Let’s apply the yaml.

$ kubectl apply -f https://github.com/kubedb/docs/raw/v2023.10.9/docs/guides/proxysql/reconfigure/cluster/examples/proxyops-update-users.yaml 
proxysqlopsrequest.ops.kubedb.com/update-user created

Now wait for the ops-request to be Successful.

$ kubectl get proxysqlopsrequest -n demo     
NAME          TYPE          STATUS       AGE
add-user      Reconfigure   Successful   2m36s
update-user   Reconfigure   Successful   6s

Let’s check the mysql_users table from the admin interface.

ProxySQLAdmin > select username,password,active,default_hostgroup from mysql_users;
+----------+-------------------------------------------+--------+-------------------+
| username | password                                  | active | default_hostgroup |
+----------+-------------------------------------------+--------+-------------------+
| testA    | *1BB8830D52D091A226FB7990D996CBC20F913475 | 0      | 3                 |
| testB    | *AE9C3C2838160D2591B6B15FA281CE712ABE94F0 | 1      | 3                 |
+----------+-------------------------------------------+--------+-------------------+
2 rows in set (0.000 sec)

From the above output we can see that the user information has been successfuly updated.

Delete Users

To delete user from the mysql_users table, all we need to do is just provide the usernames in the spec.configuration.mysqlUsers.users array and set the spec.reqType to delete. Let’s have a look at the following yaml.

apiVersion: ops.kubedb.com/v1alpha1
kind: ProxySQLOpsRequest
metadata:
  name: delete-user
  namespace: demo
spec:
  type: Reconfigure  
  proxyRef:
    name: proxy-server
  configuration:
    mysqlUsers:
      users: 
      - username: testA
      reqType: delete

Let’s apply the yaml.

$ kubectl apply -f https://github.com/kubedb/docs/raw/v2023.10.9/docs/guides/proxysql/reconfigure/cluster/examples/proxyops-remove-users.yaml 
proxysqlopsrequest.ops.kubedb.com/delete-user created

Let’s wait for the ops-request to be successful.

$ kubectl get proxysqlopsrequest -n demo    
NAME          TYPE          STATUS       AGE
add-user      Reconfigure   Successful   5m29s
delete-user   Reconfigure   Successful   12s
update-user   Reconfigure   Successful   2m59s

Now check the mysql_users table in the proxysql server.

ProxySQLAdmin > select username,password,active,default_hostgroup from mysql_users;
+----------+-------------------------------------------+--------+-------------------+
| username | password                                  | active | default_hostgroup |
+----------+-------------------------------------------+--------+-------------------+
| testB    | *AE9C3C2838160D2591B6B15FA281CE712ABE94F0 | 1      | 3                 |
+----------+-------------------------------------------+--------+-------------------+
1 row in set (0.001 sec)

We can see that the user is successfuly deleted.

Reconfigure MYSQL QUERY RULES

With KubeDB ProxySQL ops-request you can reconfigure mysql_query_rules table. You can add and delete any rules in the table. Also you can update any information of any rule that is present in the table. To reconfigure the mysql_query_rules table, you need to set the .spec.type to Reconfigure, provide the KubeDB ProxySQL instance name under the spec.proxyRef section and provide the desired user infos under the spec.configuration.mysqlQueryRules.rules section. Set the .spec.configuration.mysqlQueryRules.reqType to either add, update or delete based on the operation you want to do. Below there are some samples for corresponding request type.

Check current mysql_query_rules table in ProxySQL

Let’s check the current mysql_query_rules table in the proxysql server. We might see some of the rules are already present. It happens when no rules are set in the .spec.initConfig section while deploying the proxysql. The operator adds some of the default query rules so that the basic operations can be run through the proxysql server.

ProxySQLAdmin > select rule_id,active,match_digest,destination_hostgroup,apply from mysql_query_ru
les;
+---------+--------+----------------------+-----------------------+-------+
| rule_id | active | match_digest         | destination_hostgroup | apply |
+---------+--------+----------------------+-----------------------+-------+
| 1       | 1      | ^SELECT.*FOR UPDATE$ | 2                     | 1     |
| 2       | 1      | ^SELECT              | 3                     | 1     |
| 3       | 1      | .*                   | 2                     | 1     |
+---------+--------+----------------------+-----------------------+-------+
3 rows in set (0.001 sec)

Add Query Rules

Let’s add a query rule to the mysql_query_rules table with the proxysqlopsrequest. We should create a yaml like the following.

apiVersion: ops.kubedb.com/v1alpha1
kind: ProxySQLOpsRequest
metadata:
  name: add-rule
  namespace: demo
spec:
  type: Reconfigure  
  proxyRef:
    name: proxy-server
  configuration:
    mysqlQueryRules:
      rules: 
      - rule_id: 4
        active: 1
        match_digest: "^SELECT .* FOR DELETE$"
        destination_hostgroup: 2
        apply: 1
      reqType: add

Let’s apply the ops-request yaml.

$ kubectl apply -f https://github.com/kubedb/docs/raw/v2023.10.9/docs/guides/proxysql/reconfigure/cluster/examples/proxyops-add-rules.yaml  
proxysqlopsrequest.ops.kubedb.com/add-rule created

Wait for the ops-request to be successful.

$ kubectl get proxysqlopsrequest -n demo | grep rule
add-rule      Reconfigure   Successful   59s

Now let’s check the mysql_query_rules table in the proxysql server.

ProxySQLAdmin > select rule_id,active,match_digest,destination_hostgroup,apply from mysql_query_rules;
+---------+--------+------------------------+-----------------------+-------+
| rule_id | active | match_digest           | destination_hostgroup | apply |
+---------+--------+------------------------+-----------------------+-------+
| 1       | 1      | ^SELECT.*FOR UPDATE$   | 2                     | 1     |
| 2       | 1      | ^SELECT                | 3                     | 1     |
| 3       | 1      | .*                     | 2                     | 1     |
| 4       | 1      | ^SELECT .* FOR DELETE$ | 2                     | 1     |
+---------+--------+------------------------+-----------------------+-------+
4 rows in set (0.001 sec)

We can see that the users has been successfuly added to the mysql_query_rules table.

Update Query Rules

We have successfuly added new rule in the mysql_query_rules table with proxysqlopsrequest in the last section. Now we will see how to update any rules information with proxysqlopsrequest.

Suppose we want to update the active status rule 4. We can create an ops-request like the following. As in the mysql_query_rules table the rule_id is the primary key, we should always provide the rule_id in the information. To update just change the .spec.reqType to update.

apiVersion: ops.kubedb.com/v1alpha1
kind: ProxySQLOpsRequest
metadata:
  name: update-rule
  namespace: demo
spec:
  type: Reconfigure  
  proxyRef:
    name: proxy-server
  configuration:
    mysqlQueryRules:
      rules: 
      - rule_id: 4
        active: 0
      reqType: update

Let’s apply the yaml.

$ kubectl apply -f https://github.com/kubedb/docs/raw/v2023.10.9/docs/guides/proxysql/reconfigure/cluster/examples/proxyops-update-rules.yaml 
proxysqlopsrequest.ops.kubedb.com/update-rule created

Now wait for the ops-request to be successful.

$ kubectl get proxysqlopsrequest -n demo | grep rule
add-rule      Reconfigure   Successful   3m10s
update-rule   Reconfigure   Successful   71s

Let’s check the mysql_query_rules table from the admin interface.

ProxySQLAdmin > select rule_id,active,match_digest,destination_hostgroup,apply from mysql_query_rules;
+---------+--------+------------------------+-----------------------+-------+
| rule_id | active | match_digest           | destination_hostgroup | apply |
+---------+--------+------------------------+-----------------------+-------+
| 1       | 1      | ^SELECT.*FOR UPDATE$   | 2                     | 1     |
| 2       | 1      | ^SELECT                | 3                     | 1     |
| 3       | 1      | .*                     | 2                     | 1     |
| 4       | 0      | ^SELECT .* FOR DELETE$ | 2                     | 1     |
+---------+--------+------------------------+-----------------------+-------+
4 rows in set (0.001 sec)

From the above output we can see that the rules information has been successfuly updated.

Delete Query Rules

To delete rules from the mysql_query_rules table, all we need to do is just provide the rule_id in the spec.configuration.mysqlQueryRules.rules array and set the .spec.reqType to "delete". Let’s have a look at the below yaml.

apiVersion: ops.kubedb.com/v1alpha1
kind: ProxySQLOpsRequest
metadata:
  name: delete-rule
  namespace: demo
spec:
  type: Reconfigure  
  proxyRef:
    name: proxy-server
  configuration:
    mysqlQueryRules:
      rules: 
      - rule_id: 4
      reqType: delete

Let’s apply the yaml.

$ kubectl apply -f https://github.com/kubedb/docs/raw/v2023.10.9/docs/guides/proxysql/reconfigure/cluster/examples/proxyops-remove-rules.yaml
proxysqlopsrequest.ops.kubedb.com/delete-rule created

Let’s wait for the ops-request to be Successful.

$ kubectl get proxysqlopsrequest -n demo | grep rule
add-rule      Reconfigure   Successful   4m13s
delete-rule   Reconfigure   Successful   12s
update-rule   Reconfigure   Successful   2m14s

Now check the mysql_query_rules table in the proxysql server.

ProxySQLAdmin > select rule_id,active,match_digest,destination_hostgroup,apply from mysql_query_rules;
+---------+--------+----------------------+-----------------------+-------+
| rule_id | active | match_digest         | destination_hostgroup | apply |
+---------+--------+----------------------+-----------------------+-------+
| 1       | 1      | ^SELECT.*FOR UPDATE$ | 2                     | 1     |
| 2       | 1      | ^SELECT              | 3                     | 1     |
| 3       | 1      | .*                   | 2                     | 1     |
+---------+--------+----------------------+-----------------------+-------+
3 rows in set (0.001 sec)

We can see that the user is successfuly deleted.

Reconfigure Global Variables

With KubeDB ProxySQL ops-request you can reconfigure mysql variables and admin variables. You can reconfigure almost all the global variables except mysql-interfaces, mysql-monitor_username, mysql-monitor_password, mysql-ssl_p2s_cert, mysql-ssl_p2s_key, mysql-ssl_p2s_ca, admin-admin_credentials and admin-mysql_interface. To reconfigure any variable, you need to set the .spec.type to Reconfigure, provide the KubeDB ProxySQL instance name under the spec.proxyRef section and provide the desired configuration under the spec.configuration.adminVariables and the spec.cofiguration.mysqlVariables section. Below there are some samples for corresponding request type.

Suppose we want to update 4 global variables. Among these 2 are admin variables : cluster_check_interval_ms and refresh_interval . The other 2 are mysql variables : max_stmts_per_connection and max_transaction_time.

Let’s see the current status from the proxysql server.

ProxySQLAdmin > show global variables;
+----------------------------------------------------------------------+--------------------------------------+
| Variable_name                                                        | Value                                |
+----------------------------------------------------------------------+--------------------------------------+
| ...                                                                  | ...                                  |
| admin-cluster_check_interval_ms                                      | 200                                  |
| ...                                                                  | ...                                  |
| admin-refresh_interval                                               | 2000                                 |
| ...                                                                  | ...                                  |
| mysql-max_stmts_per_connection                                       | 20                                   |
| ...                                                                  | ...                                  |
| mysql-max_transaction_time                                           | 14400000                             |
| ...                                                                  | ...                                  |
+----------------------------------------------------------------------+--------------------------------------+
193 rows in set (0.001 sec)

To reconfigure these variables all we need to do is create a yaml like the following. Just mention the variable name and its desired value in a key-value style under corresponding variable type i.e mysqlVariables and adminVariables.

apiVersion: ops.kubedb.com/v1alpha1
kind: ProxySQLOpsRequest
metadata:
  name: reconfigure-vars
  namespace: demo
spec:
  type: Reconfigure  
  proxyRef:
    name: proxy-server
  configuration:
    adminVariables:
      refresh_interval: 2055
      cluster_check_interval_ms: 205
    mysqlVariables:
      max_transaction_time: 1540000
      max_stmts_per_connection: 19

Let’s apply the yaml.

$ kubectl apply -f https://github.com/kubedb/docs/raw/v2023.10.9/docs/guides/proxysql/reconfigure/cluster/examples/proxyops-recon-vars.yaml
proxysqlopsrequest.ops.kubedb.com/recofigure-vars created

Wait for the ops-request to be successful.

$ kubectl get proxysqlopsrequest -n demo | grep reco
reconfigure-vars   Reconfigure   Successful   30s

Now let’s check the variables we wanted to reconfigure.

ProxySQLAdmin > show global variables;
+----------------------------------------------------------------------+--------------------------------------+
| Variable_name                                                        | Value                                |
+----------------------------------------------------------------------+--------------------------------------+
| ...                                                                  | ...                                  |
| admin-cluster_check_interval_ms                                      | 205                                  |
| ...                                                                  | ...                                  |
| admin-refresh_interval                                               | 2055                                 |
| ...                                                                  | ...                                  |
| mysql-max_stmts_per_connection                                       | 19                                   |
| ...                                                                  | ...                                  |
| mysql-max_transaction_time                                           | 1540000.0                            |
| ...                                                                  | ...                                  |
+----------------------------------------------------------------------+--------------------------------------+
193 rows in set (0.001 sec)

From the above output we can see the variables has been successfuly updated with the desired value.

Clean-up

$ kubectl delete proxysql -n demo proxy-server
$ kubectl delete proxysqlopsrequest -n demo --all 
$ kubectl delete mysql -n demo mysql-server
$ kubectl delete ns demo

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Reconfigure ProxySQL Cluster Database

Before You Begin

Prepare MySQL backend

Prepare ProxySQL Cluster

Reconfigure MYSQL USERS

Create user in mysql database

Check current mysql_users table in ProxySQL

Add Users

Update Users

Delete Users

Reconfigure MYSQL QUERY RULES

Check current mysql_query_rules table in ProxySQL

Add Query Rules

Update Query Rules

Delete Query Rules

Reconfigure Global Variables

Clean-up

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