update

mysql/Demo/MGR/README.md

@@ -0,0 +1,36 @@
+# 部署 MySQL Group Replication
+
+- 按实际环境修改
+    - docker-compose.yml
+    - mysql{1..3}/my.cnf
+
+- 创建目录
+    ```
+    grep '\<source:' docker-compose.yml | cut -d: -f2 | xargs mkdir -p
+    ```
+
+- 启动 mysql1
+    ```
+    docker-compose up -d mysql1
+    ```
+
+- 查看 mysql1 容器日志，直至出现 "MySQL is ready for connections." 字样
+    ```
+    docker-compose logs -f mysql1
+    ```
+
+- 启动 mysql2 和 mysql3
+    ```
+    docker-compose up -d
+    ```
+
+- 查看 mysql2 容器日志，直至出现 "MySQL is ready for connections." 字样
+    ```
+    docker-compose logs -f mysql2
+    ```
+
+- 查看 mysql3 容器日志，直至出现 "MySQL is ready for connections." 字样
+    ```
+    docker-compose logs -f mysql3
+    ```
+