Deploy OMS on multiple nodes in multiple regions|V4.0.2|OceanBase Migration Service| docs|Distributed Database

This topic describes how to deploy OceanBase Migration Service (OMS) on multiple nodes in multiple regions by using deployment tools.

Background

As more users apply OMS in data migration, OMS must adapt to increasingly diverse scenarios. In addition to single-region data migration and data synchronization, OMS supports data synchronization across regions, data migration between IDCs in different regions, and active-active data synchronization.

You can deploy OMS on one or more nodes in each region. OMS can be deployed on multiple nodes in a region to build an environment with high availability. In this way, OMS can start components on appropriate nodes based on the tasks.

For example, if you want to synchronize data from Region Hangzhou to Region Heilongjiang, OMS starts stores on a node in the Hangzhou region to collect the incremental logs and starts writers on a node in the Heilongjiang region to synchronize the data.

Notes:

You can deploy OMS on a single node first and scale out to multiple nodes. For more information, see Scale-out OMS.
To deploy OMS on multiple nodes across multiple regions, you must apply for a virtual IP address (VIP) for each region and use it as the mount point for the OMS console. In addition, you must configure the mapping rules of Ports 8088 and 8089 in the VIP network strategy.

You can use the VIP to access the OMS console even if an OMS node fails.

Prerequisites

The installation environment meets the system and network requirements. For more information, see System and network requirements.
A MetaDB cluster is prepared as the OMS MetaDB.
Make sure that the server to deploy OMS can connect to all other servers.
Make sure that all servers involved in the multi-node deployment can connect to each other and that you can obtain root permissions on a node by using its username and password.
The OMS installation package is obtained. Generally, the package is a tar.gz file whose name starts with oms.
The downloaded OMS installation package has been loaded into the local image repository of the Docker container on each server node.
```
docker load -i <OMS installation package>
```
The directory to which the OMS container is mounted has been prepared. OMS creates three mapping directories in this directory: /home/admin/logs, /home/ds/store, and /home/ds/run. These directories store the runtime components and logs of OMS.
(Optional) A time-series database is installed to store OMS performance monitoring data and DDL and DML statistics.

Terms

You need to replace variable names in some commands and prompts. A variable name is enclosed with angle brackets (<>).

Directory to which the OMS container is mounted: See the description of the mount directory in Prerequisites.
IP address of the server: the IP address of the host that executes the script. In a single-node deployment scenario, by default, it refers to the IP address in the cluster management (CM) configuration information.
OMS_IMAGE: the unique identifier of the loaded image. After you load the OMS installation package by using Docker, run the docker images command to obtain the [IMAGE ID] or [REPOSITORY:TAG] of the loaded image. The obtained value is the unique identifier of the loaded image. Example:
```
$sudo docker images
REPOSITORY                                          TAG                 IMAGE ID        
work.oceanbase-dev.com/obartifact-store/oms     feature_3.4.0       2a6a77257d35      
```
In this example, <OMS_IMAGE> can be work.oceanbase-dev.com/obartifact-store/oms:feature_3.4.0 or 2a6a77257d35. Replace the value of <OMS_IMAGE> in related commands with the preceding value.
Directory of the config.yaml file: If you want to deploy OMS based on the current config.yaml configuration file, this directory is the one where the current configuration file is located.

Deploy OMS without a configuration file

Log on to the server where OMS is to be deployed.
Optional. Deploy a time-series database.

If you need to collect and display OMS monitoring data, deploy a time-series database. Otherwise, you can skip this step. For more information, see Deploy a time-series database.

Run the following command to obtain the deployment script from the loaded image:

sudo docker run -d --name oms-config-tool <OMS_IMAGE> bash && sudo docker cp oms-config-tool:/root/docker_remote_deploy.sh . && sudo docker rm -f oms-config-tool

Example:

sudo docker run -d --net host --name oms-config-tool work.oceanbase-dev.com/obartifact-store/oms:feature_3.4.0 bash && sudo docker cp oms-config-tool:/root/docker_remote_deploy.sh . && sudo docker rm -f oms-config-tool

Use the deployment script to start the deployment tool.

sh docker_remote_deploy.sh -o <deploy_tool_workdir> -i <IP address of the server> -d <OMS_IMAGE>

Follow the prompts to complete the deployment. After you set each parameter, press Enter to move on to the next parameter.
1. Select the deployment mode.
  
  Select Multiple Regions.
2. Select the task.
  
  Select No Configuration File. Deploy OMS Starting from Configuration File Generation.
3. Specify the following MetaDB information:
  1. Enter the URL, port, username, and password of the MetaDB.
  2. Set the prefix for names of databases in the MetaDB
    
    For example, when the prefix is set to oms, the databases in the MetaDB are named oms_rm, oms_cm, and oms_cm_hb.
  3. Confirm your settings.
    
    If the settings are correct, enter y and press Enter to proceed. Otherwise, enter n and press Enter to modify the settings.
  4. If the system displays "The specified database names already exist in the MetaDB. Are you sure that you want to continue?", it indicates that the database names you specified already exist in the MetaDB. This may be caused by repeated deployment or upgrade of OMS. You can enter y and press Enter to proceed, or enter n and press Enter to re-specify the settings.
4. Perform the following operations to configure the OMS cluster settings:
  1. Enter the region ID for the parameter cm_region, for exmaple, cn-hangzhou.
  2. Enter the region ID for the parameter cm_region_cn. It is the same as cm_region, for example, cn-hangzhou.
  3. Specify the URL of the CM service, which is the VIP or domain name to which all CM servers in the region are mounted. The original parameter is cm-url.
    
    Enter the VIP or domain name as the URL of the CM service. You can separately specify the IP address and port number in the URL, or use a colon (:) to join the IP address and port number in the : format.
    
    Note
    
    The http:// prefix in the URL is optional.
  4. Enter the IP addresses of all servers in the region. Separate them with commas (,).
  5. Set a region ID for the current region (Region name in Chinese). Value range: [0,127].
    
    An ID uniquely identifies a region.
  6. Specify whether to preferentially access the current region.
    
    In the multi-region deployment mode, you must set this parameter to true for at least one region. If yes, enter y and press Enter. If not, enter n and press Enter.
  7. Confirm the displayed CM settings.
    
    If the settings are correct, enter y and press Enter to proceed. Otherwise, enter n and press Enter to modify the settings.
5. Confirm whether to enable OMS historical data monitoring.
  - If you have deployed a time-series database, enter y and press Enter to go to the next step to configure the time-series database and enable the monitoring of OMS historical data.
  - If you did not deploy a time-series database, enter n and press Enter to go to the step of "determining whether to enable the audit log feature and setting Simple Log Service (SLS) parameters". In this case, OMS does not monitor the historical data after deployment.
6. Configure the time-series database.
  
  Perform the following operations:
  1. Confirm whether you have deployed a time-series database.
    
    Enter the value based on the actual situation. If yes, enter y and press Enter. If not, enter n and press Enter to go to the step of "determining whether to enable the audit log feature and setting SLS parameters".
  2. Set the type of the time-series database to INFLUXDB.
    
    Notice
    
    At present, only INFLUXDB is supported.
  3. Enter the URL, username, and password of the time-series database.
  4. Confirm whether the displayed settings are correct.
    
    If the settings are correct, enter y and press Enter to proceed. Otherwise, enter n and press Enter to modify the settings.
7. Determine whether to enable the audit log feature and write the audit logs to Simple Log Service (SLS).
  
  To enable the audit log feature, enter y and press Enter to go to the next step to specify the SLS parameters.
  
  Otherwise, enter n and press Enter to start the deployment. In this case, OMS does not audit the logs after deployment.
8. Specify the following SLS parameters:
  1. Set the SLS parameters as prompted.
  2. Confirm whether the displayed settings are correct.
  If the settings are correct, enter y and press Enter to proceed. Otherwise, enter n and press Enter to modify the settings.
9. Start the deployment on each node one after another.
  1. Specify the directory to which the OMS container is mounted in the host.
    
    Use a directory with a large capacity.
    
    For a remote node, the username and password for logging on to the remote node are required. The corresponding user account must have the sudo privileges on the remote node.
  2. Confirm whether the OMS image file can be named as OMS_IMAGE.
    
    If the settings are correct, enter y and press Enter to proceed. Otherwise, enter n and press Enter to modify the settings.
  3. Confirm whether to install a Secure Sockets Layer (SSL) certificate for the OMS container.
    
    If yes, enter y, press Enter, and specify the https_key and https_crt directories as prompted. If not, enter n and press Enter.
10. Confirm whether to deploy OMS in a new region.
  
  After the deployment is completed, the system displays "OMS has been deployed in Regions [<Region ID 1>,<Region ID 2>…]. Do you want to deploy OMS in a new region?"
  
  If yes, enter y and press Enter to proceed. If not, enter n and press Enter to end the deployment process.
11. Perform the following operations to configure the OMS cluster settings:
  1. Enter the region ID for the parameter cm_region, for exmaple, cn-hangzhou.
  2. Enter the region ID for the parameter cm_region_cn. It is the same as cm_region, for example, cn-hangzhou.
  3. Set a region ID for the current region (Region name in Chinese). Value range: [0,127].
    
    An ID uniquely identifies a region.
12. A message is displayed, showing the names and IDs of existing regions, to help you avoid using an existing name or ID for a new region.

Deploy OMS with a configuration file

Log on to the server where OMS is to be deployed.
Optional. Deploy a time-series database.

If you need to collect and display OMS monitoring data, deploy a time-series database. Otherwise, you can skip this step. For more information, see Deploy a time-series database.

Run the following command to obtain the deployment script from the loaded image:

sudo docker run -d --name oms-config-tool <OMS_IMAGE> bash && sudo docker cp oms-config-tool:/root/docker_remote_deploy.sh . && sudo docker rm -f oms-config-tool

Use the deployment script to start the deployment tool.
```
sh docker_remote_deploy.sh -o <deploy_tool_workdir> -c <directory of the config.yaml file> -i <IP address of the server> -d <OMS_IMAGE>
```
Note

For more information about settings of the config.yaml file, see the "Template and example of a configuration file" section.
Follow the prompts to complete the deployment. After you set each parameter, press Enter to move on to the next parameter.
1. Select the deployment mode.
  
  Select Multiple Nodes in Single Region.
2. Select the task.
  
  Select Use Configuration File Uploaded with Script Option [-c].
3. If the system displays "The specified database names already exist in the MetaDB. Are you sure that you want to continue?", it indicates that the database names you specified already exist in the MetaDB. This may be caused by repeated deployment or upgrade of OMS. You can enter y and press Enter to proceed, or enter n and press Enter to re-specify the settings.
4. If the configuration file passes the check, all the settings are displayed. If the settings are correct, enter y and press Enter to proceed. Otherwise, enter n and press Enter to modify the settings.
  
  If the configuration file fails the check, modify the configuration information as prompted.
5. Start the deployment on each node one after another.
  1. Specify the directory to which the OMS container is mounted in the host.
    
    Use a directory with a large capacity.
    
    For a remote node, the username and password for logging on to the remote node are required. The corresponding user account must have the sudo privileges on the remote node.
  2. Confirm whether the OMS image file can be named as OMS_IMAGE.
    
    If the settings are correct, enter y and press Enter to proceed. Otherwise, enter n and press Enter to modify the settings.
  3. Confirm whether to install a Secure Sockets Layer (SSL) certificate for the OMS container.
    
    If yes, enter y, press Enter, and specify the https_key and https_crt directories as prompted. If not, enter n and press Enter.
6. Confirm whether to deploy OMS in a new region.
  
  After the deployment is completed, the system displays "OMS has been deployed in Regions [<Region ID 1>,<Region ID 2>…]. Do you want to deploy OMS in a new region?"
  
  If yes, enter y and press Enter to proceed. If not, enter n and press Enter to end the deployment process.
7. Perform the following operations to configure the OMS cluster settings:
  1. Enter the region ID for the parameter cm_region, for exmaple, cn-hangzhou.
  2. Enter the region ID for the parameter cm_region_cn. It is the same as cm_region, for example, cn-hangzhou.
  3. Set a region ID for the current region (Region name in Chinese). Value range: [0,127].
    
    An ID uniquely identifies a region.
8. A message is displayed, showing the names and IDs of existing regions, to help you avoid using an existing name or ID for a new region.
9. To modify the configuration after deployment, log on to the OMS container and perform the following steps:
  
  Notice
  
  If you deploy OMS on multiple nodes in multiple regions, you must manually modify the configuration of each node.
  1. Modify the config.yaml file based on business needs.
  2. Run the python -m omsflow.scripts.units.oms_init_manager --init-config-file command.
  3. Run the supervisorctl restart oms_console oms_drc_supervisor command.

Template and example of a configuration file

Configuration file template

The configuration file template in this topic is used for the regular password-based logon method. If you log on to the OMS console by using single sign-on (SSO), you need to connect OMS to the OpenID Connect (OIDC) protocol and add parameters in the config.yaml file. For more information, see Integrate the OIDC protocol to OMS to implement SSO.

Notice

When multiple regions exist, you must set the cm_is_default parameter to true for only one region, and set it to false for all other regions. In addition, you must sequentially run commands in each region.
To deploy multiple nodes in the Hangzhou region, specify the IP addresses of all nodes for the cm_nodes parameter.
You must replace the sample values of required parameters based on your actual deployment environment. Both the required and optional parameters are described in the following table. You can specify the optional parameters as needed.
In the config.yaml file, you must specify the parameters in the key: value format, with a space after the colon (:).

In the following examples of the config.yaml file for the multi-node multi-region deployment mode, OMS is deployed on two nodes in the Hangzhou and Heilongjiang regions.

The following example describes a template of the config.yaml file for you to deploy OMS in the Hangzhou region:

# Information about the OMS MetaDB
oms_meta_host: ${oms_meta_host}
oms_meta_port: ${oms_meta_port}
oms_meta_user: ${oms_meta_user}
oms_meta_password: ${oms_meta_password}

# You can customize the names of the following three databases, which are created in the MetaDB when you deploy OMS.
drc_rm_db: ${drc_rm_db}
drc_cm_db: ${drc_cm_db}
drc_cm_heartbeat_db: ${drc_cm_heartbeat_db}

# Configure the OMS cluster in the Hangzhou region.
# To deploy OMS on multiple nodes in multiple regions, you must set the cm_url parameter to a VIP or domain name to which all CM servers in the region are mounted.
cm_url: ${cm_url}
cm_location: ${cm_location}
cm_region: ${cm_region}
cm_region_cn: ${cm_region_cn}
cm_is_default: true
cm_nodes:
 - ${host_ip1}
 -  ${host_ip2}

# Configurations of the time-series database
# Default value: false. To enable metric reporting, set the parameter to `true`.
# tsdb_enabled: false
# If the `tsdb_enabled` parameter is set to `true`, delete comments for the following parameters and specify the values based on your actual configurations.
# tsdb_service: 'INFLUXDB'
# tsdb_url: '${tsdb_url}'
# tsdb_username: ${tsdb_user}
# tsdb_password: ${tsdb_password}

Parameter	Description	Required
oms_meta_host	The IP address of the MetaDB, which can be the IP address of a MySQL database or a MySQL tenant of OceanBase Database. Notice: This parameter is valid only in OceanBase Database V2.0 and later.	Yes
oms_meta_port	The port number of the MetaDB.	Yes
oms_meta_user	The username of the MetaDB.	Yes
oms_meta_password	The user password of the MetaDB.	Yes
drc_rm_db	The name of the database for the OMS console.	Yes
drc_cm_db	The name of the database for the CM service.	Yes
drc_cm_heartbeat_db	The name of the heartbeat database for the CM service.	Yes
cm_url	The URL of the OMS CM service. Example: http://VIP:8088. Note: To deploy OMS on multiple nodes in multiple regions, you must set the `cm_url` parameter to a VIP or domain name to which all CM servers in the region are mounted. We do not recommend that you set it to `http://127.0.0.1:8088`. The access URL of the OMS console is in the format of `IP address of the host on which OMS is deployed:8089`. Example: `http(https)://xxx.xxx.xxx.xxx:8089`. Port 8088 is used for program calls, and Port 8089 is used for web page access. You must specify Port 8088.	Yes
cm_location	The code of the region. Value range: [0,127]. You can select one number for each region. Notice: If you upgrade to OMS V3.2.1 from an earlier version, you must set the `cm_location` parameter to `0`.	Yes
cm_region	The name of the region. Example: cn-hangzhou. Notice: If you use OMS with the Alibaba Cloud Multi-Site High Availability (MSHA) service in an active-active disaster recovery scenario, use the region configured for the Alibaba Cloud service.	Yes
cm_region_cn	The value here is the same as the value of cm_region.	Yes
cm_nodes	The IP addresses of servers on which the OMS CM service is deployed. In multi-node deployment mode, you must specify multiple IP addresses for the parameter.	Yes
cm_is_default	Indicates whether the OMS CM service is enabled by default.	No. Default value: `true`.
tsdb_service	The type of the time-series database. Valid values: `INFLUXDB` and `CERESDB`.	No. Default value: `CERESDB`.
tsdb_enabled	Indicates whether metric reporting is enabled for monitoring. Valid values: `true` and `false`.	No. Default value: `false`.
tsdb_url	The IP address of the server where InfluxDB is deployed, which needs to be modified based on the actual environment. You need to modify this parameter based on the actual environment if you set the `tsdb_enabled` parameter to `true`. After the time-series database is deployed, it maps to OMS deployed for the whole cluster. This means that although OMS is deployed in multiple regions, all regions map to the same time-series database.	No
tsdb_username	The username used to connect to the time-series database. You need to modify this parameter based on the actual environment if you set the `tsdb_enabled` parameter to `true`. After you deploy the time-series database, manually create a user and specify the username and password.	No
tsdb_password	The password used to connect to the time-series database. You need to modify this parameter based on the actual environment if you set the `tsdb_enabled` parameter to `true`.	No

The following example describes a template of the config.yaml file for you to deploy OMS in the Heilongjiang region:

The operations are the same as those for deploying OMS in the Hangzhou region, except that you must modify the following parameters in the config.yaml file: drc_cm_heartbeat_db, cm_url, cm_location, cm_region, cm_is_default, and cm_nodes.

Notice

When multiple regions exist, you must set the cm_is_default parameter to true for only one region, and set it to false for all other regions.
To deploy multiple nodes in the Heilongjiang region, specify the IP addresses of all nodes for the cm_nodes parameter.
You must execute the docker_init.sh script on at least one node in each region.

# Information about the OMS MetaDB
oms_meta_host: ${meta_ip}
oms_meta_port: ${meta_port}
oms_meta_user: ${meta_user}
oms_meta_password: ${meta_password}

# You can customize the names of the following three databases, which are created in the MetaDB when you deploy OMS.
drc_rm_db: ${drc_rm_db}
drc_cm_db: ${drc_cm_db}
drc_cm_heartbeat_db: ${drc_cm_heartbeat_db}

# Configure the OMS cluster in the Heilongjiang region.
# To deploy OMS on multiple nodes in multiple regions, you must set the cm_url parameter to a VIP or domain name to which all CM servers in the region are mounted.
cm_url: ${cm_url}
cm_location: ${cm_location}
cm_region: ${cm_region}
cm_region_cn: ${cm_region_cn}
cm_is_default: false
cm_nodes:
 - ${host_ip1}
 - ${host_ip2}

# Configurations of the time-series database
# tsdb_service: 'INFLUXDB'
# Default value: false. Set the value based on your actual configuration.
# tsdb_enabled: false

# The IP address of the server where InfluxDB is deployed.
# You need to modify the following parameters based on the actual environment if you set the tsdb_enabled parameter to true.
# tsdb_url: ${tsdb_url}
# tsdb_username: ${tsdb_user}
# tsdb_password: ${tsdb_password}

Example

Replace related parameters with the actual values in the target deployment environment.

The following example of the config.yaml file shows sample settings when OMS is deployed in the Hangzhou region:

oms_meta_host: xxx.xxx.xxx.xxx
oms_meta_port: 2883
oms_meta_user: oms_meta_user
oms_meta_password: *********
drc_rm_db: oms_rm
drc_cm_db: oms_cm
drc_cm_heartbeat_db: oms_cm_heartbeat
cm_url: http://VIP:8088
cm_location: 1
cm_region: cn-hangzhou
cm_region_cn: cn-hangzhou
cm_is_default: true
cm_nodes:
 - xxx.xxx.xxx.xx1
 - xxx.xxx.xxx.xx2
tsdb_service: 'INFLUXDB'
tsdb_enabled: true
tsdb_url: 'xxx.xxx.xxx.xxx:8086'
tsdb_username: username
tsdb_password: *************

The following example of the config.yaml file shows sample settings when OMS is deployed in the Heilongjiang region:

oms_meta_host: xxx.xxx.xxx.xxx
oms_meta_port: 2883
oms_meta_user: oms_meta_user
oms_meta_password: ***********
drc_rm_db: oms_rm
drc_cm_db: oms_cm
drc_cm_heartbeat_db: oms_cm_heartbeat_1
cm_url: http://VIP:8088
cm_location: 2
cm_region: cn-heilongjiang
cm_region_cn: cn-heilongjiang
cm_is_default: false
cm_nodes:
 - xxx.xxx.xxx.xx1
 - xxx.xxx.xxx.xx2
tsdb_service: 'INFLUXDB'
tsdb_enabled: true
tsdb_url: 'xxx.xxx.xxx.xxx:8086'
tsdb_username: username
tsdb_password: *************

Enterprise Edition

Community Edition

Deploy OMS on multiple nodes in multiple regions

Background

Prerequisites

Terms

Deploy OMS without a configuration file

Note

Notice

Deploy OMS with a configuration file

Note

Notice

Template and example of a configuration file

Configuration file template

Notice

Notice

Example