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only-root-can-sign-in-drainer-in-master-cluster&add multiple listener, drainer #2443

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Jan 11, 2023
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only-root-can-sign-in-drainer-in-master-cluster&add multiple listener, drainer #2443

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only-root-can-sign-in-drainer-in-master-cluster-
abby-cyber Jan 5, 2023
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Update replication-between-clusters.md
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add command required user roles
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Merge branch 'master' into only-root-can-sign-in-drainer-in-master-cl…
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31 changes: 30 additions & 1 deletion docs-2.0/synchronization-and-migration/replication-between-clusters.md
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Expand Up @@ -40,8 +40,11 @@ NebulaGraph 支持在集群间进行数据同步，即主集群 A 的数据可

- 从集群中数据如果不为空，数据同步时可能会导致数据冲突或者数据不一致。建议保持从集群数据为空。

- 建议使用具备 God 权限的`root`用户进行集群数据同步操作。集群同步操作中各命令需要的用户角色权限不同，详情参见文末的**权限说明**。

- 在数据同步期间，请勿同时在主集群进行数据恢复（备份恢复和快照恢复）操作，否则数据同步将失败。


## 操作步骤

### 准备工作
Expand Down Expand Up @@ -172,6 +175,10 @@ drainer：机器 IP 地址为`192.168.10.104`，只启动 drainer 服务。
+-----------+------------------+------+
```

!!! note

注册多个 drainer 服务的命令示例：`SIGN IN DRAINER SERVICE(192.168.8.x:9889),(192.168.8.x:9889)`

3. 设置 listener 服务。

```
Expand Down Expand Up @@ -201,6 +208,10 @@ drainer：机器 IP 地址为`192.168.10.104`，只启动 drainer 服务。
+--------+--------+------------------------+--------------------------------+----------+
```

!!! note

添加多个 Storage listener 服务的命令示例：`ADD LISTENER SYNC META 192.168.10.xxx:9569 STORAGE 192.168.10.xxx:9789,192.168.10.xxx:9789 TO SPACE replication_basketballplayer`

4. 登录从集群，创建图空间`replication_basketballplayer`。

```
Expand All @@ -222,6 +233,10 @@ drainer：机器 IP 地址为`192.168.10.104`，只启动 drainer 服务。
+-------------------------+----------+
```

!!! note

添加多个 drainer 服务的命令示例：`ADD DRAINER 192.168.8.x:9889,192.168.8.x:9889`

6. 修改图空间`replication_basketballplayer`为只读。

!!! note
Expand All @@ -239,7 +254,6 @@ drainer：机器 IP 地址为`192.168.10.104`，只启动 drainer 服务。
| "read_only" | "bool" | true |
+-------------+--------+-------+
```

### 3.验证数据

1. 登录主集群，创建 Schema，插入数据。
Expand Down Expand Up @@ -486,6 +500,21 @@ nebula> SHOW DRAINER SYNC STATUS;

至此主从集群切换完成。

## 权限说明

集群同步操作中各命令需要的用户角色权限不同，不同命令所需的角色权限如下（打勾代表有权限）。

| 命令 | God | Admin | DBA | User | Guest |
| ------------------------------------ | ---- | ----- | ---- | ---- | ----- |
| `SIGN IN / SIGN OUT DRAINER SERVICE` | √ | | | | |
| `ADD / REMOVE LISTENER SYNC` | √ | √ | √ | | |
| `SHOW DRAINER CLIENTS` | √ | √ | √ | √ | √ |
| `SHOW LISTENER SYNC` | √ | √ | √ | √ | √ |
| `ADD / REMOVE DRAINER` | √ | √ | √ | | |
| `SET VARIABLES read_only` | √ | | | | |
| `SHOW DRAINERS` | √ | √ | √ | √ | √ |


## 常见问题

### 主集群中已经有 data 了，从集群可以同步到之前的存量 data 吗？
Expand Down