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docs/99-reference/tips.md

@@ -9,6 +9,17 @@ git clone by ssh
     git remote set-url origin git@192.168.2.166:3122/zhangsz/WFC/be.wfc.git
 ```
 
+```sh
+# 1. 生成 SSH ed25519密钥对
+ssh-keygen -t ed25519 -C "simon@omc-dev-openEuler"
+# 2. 复制公钥内容
+cat ~/.ssh/id_ed25519.pub
+# 3. 将公钥添加到 Gitee 
+# 登录 Gitee -> 设置 -> SSH 公钥 -> 添加公钥
+# 4. 测试连接
+ssh -T git@192.168.2.166 -p 3122
+```
+
 ## docker tips
 
 使用 Docker 日志清理工具
@@ -81,3 +92,233 @@ curl --location --request POST 'https://192.168.2.249:8043/openapi/authorize/tok
 
 mvn clean compile 
 mvn clean package -P prod
+
+## mysql/mariadb tips
+
+
+有几种方法可以在 MariaDB 10.5 中修改 root 密码：
+
+## 方法1：使用 mysql CLI（已登录）
+
+如果你能以 root 用户登录 MariaDB：
+
+```bash
+sudo mysql -u root -p
+```
+
+然后执行以下命令：
+
+```sql
+ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';
+FLUSH PRIVILEGES;
+```
+
+## 方法2：安全模式重置（无法登录时）
+
+1. 停止 MariaDB 服务：
+
+```bash
+sudo systemctl stop mariadb
+```
+
+2. 以跳过权限表的方式启动 MariaDB：
+
+```bash
+sudo mysqld_safe --skip-grant-tables --skip-networking &
+```
+
+3. 无需密码连接到 MariaDB：
+
+```bash
+sudo mysql
+```
+
+4. 设置新密码：
+
+```sql
+USE mysql;
+ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';
+FLUSH PRIVILEGES;
+EXIT;
+```
+
+5. 停止并正常重启 MariaDB 服务：
+
+```bash
+sudo pkill mysqld
+sudo systemctl start mariadb
+```
+
+## 方法3：使用 mysql_secure_installation
+
+这个工具可以帮助你重置 root 密码并优化一些安全设置：
+
+```bash
+sudo mysql_secure_installation
+```
+
+按照提示操作，其中会包括重置 root 密码的选项。
+
+记得将示例中的 'new_password' 替换为你想要设置的实际密码。
+
+simonzhangsz: ░░ The job identifier is 1143.
+Apr 27 10:40:45 omc-dev-oe22 mariadb-prepare-db-dir[9062]: Database MariaDB is probably initialized in /var/lib/mysql already, nothing is done.
+Apr 27 10:40:45 omc-dev-oe22 mariadb-prepare-db-dir[9062]: If this is not the case, make sure the /var/lib/mysql is empty before running mariadb-prepare-db-dir.
+Apr 27 10:41:15 omc-dev-oe22 systemd[1]: mariadb.service: Main process exited, code=exited, status=1/FAILURE
+
+GitHub Copilot: # MariaDB Service Failure Analysis
+
+Your MariaDB service is failing to start with an exit status of 1. The logs indicate:
+
+1. The system believes the database is already initialized in mysql
+2. There may be an issue with the database files or configuration
+
+## Troubleshooting Steps
+
+1. **Check MariaDB logs for more detailed error information:**
+
+   ```bash
+   sudo journalctl -u mariadb -n 50
+   ```
+
+   or
+
+   ```bash
+   sudo cat /var/log/mysql/error.log
+   ```
+
+2. **Check permissions on the data directory:**
+
+   ```bash
+   ls -la /var/lib/mysql
+   ```
+
+   Make sure the directory is owned by the mysql user:
+
+   ```bash
+   sudo chown -R mysql:mysql /var/lib/mysql
+   ```
+
+3. **Check disk space:**
+
+   ```bash
+   df -h
+   ```
+
+4. **Try safe start to see if it provides more diagnostics:**
+
+   ```bash
+   sudo mysqld_safe --skip-grant-tables
+   ```
+
+5. **Try repairing database files:**
+
+   ```bash
+   sudo mysqlcheck --all-databases --repair --use-frm
+   ```
+
+6. **Reset permissions and restart:**
+
+   ```bash
+   sudo chmod -R 755 /var/lib/mysql
+   sudo chown -R mysql:mysql /var/lib/mysql
+   sudo systemctl restart mariadb
+   ```
+
+If the database is corrupted, you might need to backup your data (if possible) and reinitialize:
+
+```bash
+sudo systemctl stop mariadb
+sudo mv /var/lib/mysql /var/lib/mysql.bak
+sudo mkdir /var/lib/mysql
+sudo chown mysql:mysql /var/lib/mysql
+sudo mysql_install_db --user=mysql
+sudo systemctl start mariadb
+```
+
+After that, you would need to restore your databases from backup or recreate them.
+
+simonzhangsz: 如何授权某些表的权限给用户
+
+GitHub Copilot: # 如何授权某些表的权限给 MariaDB 用户
+
+在 MariaDB 中，你可以为特定用户授予对某些表的权限。以下是完整的步骤：
+
+## 1. 创建用户（如果尚不存在）
+
+```sql
+CREATE USER 'username'@'host' IDENTIFIED BY 'password';
+```
+
+例如：
+```sql
+CREATE USER 'myuser'@'localhost' IDENTIFIED BY 'mypassword';
+```
+
+## 2. 授予表级权限
+
+基本语法：
+```sql
+GRANT permission1, permission2, ... ON database_name.table_name TO 'username'@'host';
+```
+
+### 常见权限类型
+
+- `SELECT` - 读取数据
+- `INSERT` - 插入数据
+- `UPDATE` - 更新数据
+- `DELETE` - 删除数据
+- `ALTER` - 修改表结构
+- `CREATE` - 创建表
+- `DROP` - 删除表
+- `ALL PRIVILEGES` - 所有权限
+
+### 实例
+
+授予用户对特定表的SELECT权限：
+```sql
+GRANT SELECT ON mydb.mytable TO 'myuser'@'localhost';
+```
+
+授予用户对特定表的多个权限：
+```sql
+GRANT SELECT, INSERT, UPDATE ON mydb.mytable TO 'myuser'@'localhost';
+```
+
+授予用户对所有表的特定权限：
+```sql
+GRANT SELECT ON mydb.* TO 'myuser'@'localhost';
+```
+
+授予用户对多个表的权限：
+```sql
+GRANT SELECT ON mydb.table1 TO 'myuser'@'localhost';
+GRANT INSERT ON mydb.table2 TO 'myuser'@'localhost';
+```
+
+## 3. 应用更改
+
+授予权限后，刷新权限：
+```sql
+FLUSH PRIVILEGES;
+```
+
+## 4. 验证权限
+
+查看用户权限：
+```sql
+SHOW GRANTS FOR 'myuser'@'localhost';
+```
+
+## 5. 撤销权限（如需）
+
+```sql
+REVOKE permission ON database_name.table_name FROM 'username'@'host';
+```
+
+例如：
+```sql
+REVOKE INSERT ON mydb.mytable FROM 'myuser'@'localhost';
+```
+
+确保在赋予权限时遵循最小权限原则，只给用户执行其工作所需的权限。