#yasom自修复配置

# 开启yasom自修复

开启yasom自修复功能，可以在出现yasom多主异常的情况下进行自动修复，即保留1个主yasom并将其余的yasom自动降备，被降备的yasom会将自身的元数据备份至$YASDB_HOME/om/{集群名称}/data/repair/。

如自修复后数据库集群信息不符合预期，可使用yasboot cluster load命令重新加载信息。

# 前提条件

自修复与yasom仲裁（yasboot election）互斥，若已开启yasom仲裁则无法使用自修复。
需开启操作系统认证（遵循标准安装步骤时默认已开启）才能正常使用自修复功能。

# 操作步骤

以安装用户登录数据库服务器。

查看yasom进程信息。

yasboot process yasom status -c yashandb -p sys_password
+------------------------------------------------------------------------------------------------------------------------------------+
| hostid   | pid   | ipaddr       | primary           | secondary | local_yasom_addr  | role    | backup_num | max_seq | auto_repair |
+------------------------------------------------------------------------------------------------------------------------------------+
| host0001 | 15080 | 192.168.1.2  | 192.168.1.2:1675  | []        | 192.168.1.2:1675 | primary | 2          | 39      | off         |
+----------+-------+--------------+-------------------+-----------+-------------------+---------+------------+---------+-------------+
| host0002 | -     | 192.168.1.3  | 192.168.1.2:1675  | []        | -                 | -       | 2          | 39      | -           |
+----------+-------+--------------+-------------------+-----------+-------------------+---------+------------+---------+-------------+

在任一yasom进程所在服务器，执行如下命令开启自修复功能。
```
yasboot process yasom repair on -c yashandb
enable repair success
```

查看配置是否生效。

yasboot process yasom status -c yashandb
+------------------------------------------------------------------------------------------------------------------------------------+
| hostid   | pid   | ipaddr       | primary           | secondary | local_yasom_addr  | role    | backup_num | max_seq | auto_repair |
+------------------------------------------------------------------------------------------------------------------------------------+
| host0001 | 15080 | 192.168.1.2  | 192.168.1.2:1675  | []        | 192.168.1.2:1675 | primary | 2          | 39      | on          |
+----------+-------+--------------+-------------------+-----------+-------------------+---------+------------+---------+-------------+
| host0002 | -     | 192.168.1.3  | 192.168.1.2:1675  | []        | -                 | -       | 2          | 39      | -           |
+----------+-------+--------------+-------------------+-----------+-------------------+---------+------------+---------+-------------+

auto_repair = on表示开启成功，仅主yasom会显示该状态。

# 关闭yasom自修复

以安装用户登录数据库服务器。

查看yasom进程信息。

yasboot process yasom status -c yashandb
+------------------------------------------------------------------------------------------------------------------------------------+
| hostid   | pid   | ipaddr       | primary           | secondary | local_yasom_addr  | role    | backup_num | max_seq | auto_repair |
+------------------------------------------------------------------------------------------------------------------------------------+
| host0001 | 15080 | 192.168.1.2  | 192.168.1.2:1675  | []        | 192.168.1.2:1675 | primary | 2          | 39      | on          |
+----------+-------+--------------+-------------------+-----------+-------------------+---------+------------+---------+-------------+
| host0002 | -     | 192.168.1.3  | 192.168.1.2:1675  | []        | -                 | -       | 2          | 39      | -           |
+----------+-------+--------------+-------------------+-----------+-------------------+---------+------------+---------+-------------+

在任一yasom进程所在服务器，执行如下命令开启自修复功能。
```
yasboot process yasom repair off -c yashandb
disable repair success
```