Managing a FlexusX Instance Group

Updated on 2025-02-25 GMT+08:00

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Scenarios

A FlexusX instance group logically groups FlexusX instances. FlexusX instances in a FlexusX instance group comply with the same policy associated with the group.

Only the anti-affinity policy is supported. This policy enables FlexusX instances in the same FlexusX instance group to run on different hosts for improved reliability, high availability, and disaster recovery.

Constraints

FlexusX instance groups support only the anti-affinity policy. The failure domain policy is not supported.
A FlexusX instance group can contain FlexusX instances in the same region.
A FlexusX instance can be added to only one FlexusX instance group.
If the maximum number of FlexusX instance groups is reached, you can contact customer service to increase the quota.

Procedure

You can perform the following operations to manage a FlexusX instance group.

Creating a FlexusX Instance Group
Adding a FlexusX Instance to a FlexusX Instance Group
Removing a FlexusX Instance from a FlexusX Instance Group
Deleting a FlexusX Instance Group

Create a FlexusX instance group, so that you can apply a policy to the entire group. FlexusX instance groups are independent from each other.

Access the page for creating a FlexusX instance group from the ECS console or the FlexusX console as follows:
NOTE:

Ensure that the FlexusX instance group and the FlexusX instances to be added are in the same region, or the FlexusX instances cannot be added.
- Log in to the ECS console. Switch to the ECS Group page, click in the upper left corner, and select a region.
- Log in to the FlexusX console, in the upper left corner, click , and select a region.
  Click the name of a FlexusX instance. On the details page, click Create FlexusX Instance Group.
  
  Figure 1 Creating a server group
On the ECS Group page, click Create ECS Group and set the ECS group name and policy.
Only the anti-affinity policy is supported.
Click OK.

To improve service reliability, you can add FlexusX instances to a FlexusX instance group to place these FlexusX instances on different hosts.

You can add a FlexusX instance to a FlexusX instance group when you are creating the instance. For details, see 13.d.
You can also add a FlexusX instance to a FlexusX instance group after you create the instance, as described in this part.

NOTE:

When a FlexusX instance is added to a FlexusX instance group, the system reallocates a host to run this FlexusX instance to ensure that the FlexusX instances in this group run on different hosts. When the FlexusX instance is being restarted, the startup may fail due to insufficient resources. In such a case, remove the FlexusX instance from its group and try to restart the FlexusX instance again.

Log in to the ECS console. Switch to the ECS Group page, click in the upper left corner, and select a region.
Locate the row that contains the target FlexusX instance group and click Add ECS in the Operation column.
On the Add ECS page, select the FlexusX instance to be added.

Figure 2 Adding a FlexusX Instance
Click OK.

If a FlexusX instance is removed from a FlexusX instance group, the anti-affinity policy is no longer applied to that instance.

Log in to the ECS console. Switch to the ECS Group page, click in the upper left corner, and select a region.
Expand the FlexusX instance group information and view the FlexusX instances in it.
Locate the FlexusX instance to be removed and click Remove in the Operation column.
Click OK.

Deleting a FlexusX instance group will remove the policy constraints on instances in the group.

Log in to the ECS console. Switch to the ECS Group page, click in the upper left corner, and select a region.
Locate the FlexusX instance group to be deleted and click Delete in the Operation column.
In the displayed dialog box, click Yes.

Create a FlexusX instance group, so that you can apply a policy to the entire group. FlexusX instance groups are independent from each other.

Access the page for creating a FlexusX instance group from the ECS console or the FlexusX console as follows:
NOTE:

Ensure that the FlexusX instance group and the FlexusX instances to be added are in the same region, or the FlexusX instances cannot be added.
- Log in to the ECS console. Switch to the ECS Group page, click in the upper left corner, and select a region.
- Log in to the FlexusX console, in the upper left corner, click , and select a region.
  Click the name of a FlexusX instance. On the details page, click Create FlexusX Instance Group.
  
  Figure 1 Creating a server group
On the ECS Group page, click Create ECS Group and set the ECS group name and policy.
Only the anti-affinity policy is supported.
Click OK.

To improve service reliability, you can add FlexusX instances to a FlexusX instance group to place these FlexusX instances on different hosts.

You can add a FlexusX instance to a FlexusX instance group when you are creating the instance. For details, see 13.d.
You can also add a FlexusX instance to a FlexusX instance group after you create the instance, as described in this part.

NOTE:

Log in to the ECS console. Switch to the ECS Group page, click in the upper left corner, and select a region.
Locate the row that contains the target FlexusX instance group and click Add ECS in the Operation column.
On the Add ECS page, select the FlexusX instance to be added.

Figure 2 Adding a FlexusX Instance
Click OK.

If a FlexusX instance is removed from a FlexusX instance group, the anti-affinity policy is no longer applied to that instance.

Log in to the ECS console. Switch to the ECS Group page, click in the upper left corner, and select a region.
Expand the FlexusX instance group information and view the FlexusX instances in it.
Locate the FlexusX instance to be removed and click Remove in the Operation column.
Click OK.

Deleting a FlexusX instance group will remove the policy constraints on instances in the group.

Log in to the ECS console. Switch to the ECS Group page, click in the upper left corner, and select a region.
Locate the FlexusX instance group to be deleted and click Delete in the Operation column.
In the displayed dialog box, click Yes.