mariadb replicat doc

Databases/Mariadb/Replication.md

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+
+# 📘 MariaDB Replication Setup Guide
+
+This guide walks you through setting up **Master-Slave Replication** using MariaDB.
+
+---
+
+## 🛠️ Step 1: Install MariaDB
+
+Install MariaDB on both the **master** and **slave** servers.
+
+```bash
+sudo apt update
+sudo apt install mariadb-server
+```
+
+---
+
+## ⚙️ Step 2: Configure the Master Server
+
+Edit the MariaDB configuration file:
+
+```bash
+sudo vim /etc/mysql/mariadb.conf.d/50-server.cnf
+```
+
+Add or modify the following under the `[mariadb]` section:
+
+```cnf
+[mariadb]
+log-bin
+server_id=1
+log-basename=master1
+binlog-format=mixed
+```
+
+🔁 **Also**, change the `bind-address` to allow external connections:
+
+```cnf
+bind-address = 0.0.0.0
+```
+
+---
+
+## 🔐 Step 3: Create Replication User
+
+Access the MariaDB shell:
+
+```bash
+sudo mysql
+```
+
+Then run:
+
+```sql
+CREATE USER 'radin'@'%' IDENTIFIED BY '123';
+GRANT REPLICATION SLAVE ON *.* TO 'radin'@'%';
+FLUSH PRIVILEGES;
+```
+
+---
+
+## 📈 Step 4: Check Master Status
+
+Still inside the MariaDB shell, run:
+
+```sql
+FLUSH TABLES WITH READ LOCK;
+SHOW MASTER STATUS;
+```
+
+Take note of:
+
+* `File`: The binary log file name (e.g., `db-master1-bin.000003`)
+* `Position`: The log position (e.g., `347`)
+
+Then, in a separate terminal, unlock tables:
+
+```sql
+UNLOCK TABLES;
+```
+
+---
+
+## 🛠️ Step 5: Configure the Slave Server
+
+Edit the config file on the slave:
+
+```bash
+sudo vim /etc/mysql/mariadb.conf.d/50-server.cnf
+```
+
+Set the following:
+
+```cnf
+[mariadb]
+log-bin
+server_id=2
+log-basename=slave1
+binlog-format=mixed
+```
+
+---
+
+## 🔄 Step 6: Set Up Slave Replication
+
+Access the MariaDB shell on the slave server:
+
+```bash
+sudo mysql
+```
+
+Run the following (replace values as needed):
+
+```sql
+CHANGE MASTER TO
+  MASTER_HOST='192.168.6.160',
+  MASTER_USER='radin',
+  MASTER_PASSWORD='123',
+  MASTER_PORT=3306,
+  MASTER_LOG_FILE='db-master1-bin.000003',
+  MASTER_LOG_POS=347,
+  MASTER_CONNECT_RETRY=10;
+```
+
+Start the slave:
+
+```sql
+START SLAVE;
+```
+
+Check slave status:
+
+```sql
+SHOW SLAVE STATUS\G
+```
+
+Look for:
+
+* `Slave_IO_Running: Yes`
+* `Slave_SQL_Running: Yes`
+
+---
+
+## 🔁 Resetting the Slave
+
+To reset the slave configuration:
+
+```sql
+STOP SLAVE;
+RESET SLAVE ALL;
+```
+