Help Center/ Elastic Cloud Server/ FAQs/ ECS Creation/ How Can I Set Sequential ECS Names When Creating Multiple ECSs?
Updated on 2025-11-18 GMT+08:00
View PDF
Share

How Can I Set Sequential ECS Names When Creating Multiple ECSs?

Scenarios

When creating multiple ECSs at the same time, you can use either of the following methods to sequentially name the ECSs:

  • Automatic naming: The system automatically numbers ECSs with a four-digit suffix in ascending order.
  • Custom naming: You can create a custom naming rule using the format "name_prefix[begin_number,bits]name_suffix". The system will name the ECSs based on the rule you specify.

This section describes how to use the two methods to name ECSs.

Automatic Naming

You can customize ECS names based on the following rule: 1 to 64 characters, only containing letters, digits, underscores (_), and hyphens (-).

When you create multiple ECSs at a time, the system automatically numbers these ECSs with a four-digit suffix in ascending order. In this case, the name is 1 to 59 characters long. For example, if you are creating multiple ECSs and enter ecs for the ECS name, the created ECSs will be named ecs-0001, ecs-0002, and so on. If you create multiple ECSs again, the values in the new ECS names increase from the existing maximum value. For example, the existing ECS with the maximum number in name is ecs-0010. If you enter ecs, the names of the new ECSs will be ecs-0011, ecs-0012, .... When the value reaches 9999, it will start from 0001.

Allow duplicate name: allows ECS names to be duplicate. If you select Allow duplicate name and create multiple ECSs in a batch, the created ECSs will have the same name.

  • Example 1: If there is no existing ECS and you enter ecs-f526, the ECSs will be named ecs-f526-0001, ecs-f526-0002, ecs-f526-0003, ....
  • Example 2: If there is an ECS named ecs-f526-0010 and you enter ecs-f526, the ECSs will be named ecs-f526-0011, ecs-f526-0012, ecs-f526-0013, ....
  • Example 3: If there is an ECS named ecs-0010 and you select Allow duplicate ECS name, all the ECSs will be named ecs-0010.

Custom Naming

You can create a custom naming rule using the format "name_prefix[begin_number,bits]name_suffix". The system will automatically name the ECSs based on the rule you specify.

Field Description for a Custom Naming Rule

Figure 1 shows the format of a custom naming rule.

Figure 1 Format of a custom naming rule

Table 1 describes these parameters.

Table 1 Parameters in a custom naming rule

Field

Mandatory

Description

Example

name_prefix

Yes

ECS name prefix

The name prefix can contain only letters, digits, underscores (_), and hyphens (-).

ecs

[begin_number,bits]

Yes

Sequence numbers that increase in ascending order to differentiate multiple ECSs.

[0,4]

name_suffix

No

ECS name suffix

The name suffix can contain only letters, digits, underscores (_), and hyphens (-).

f526
Table 2 [begin_number,bits] parameters

Field

Mandatory

Description

Example

begin_number

No

Begin number of ECS names.

The begin number ranges from 0 to 9999. The default value is 0.

0

bits

No

Number of bits for the sequential numbers in ECS names.

The value ranges from 1 to 4. The default value is 4.

4
Notes on Using the Custom Naming Rule
  • Custom names cannot be duplicate.
  • No space is allowed in [begin_number,bits].
  • If the bits of "Begin number + Number of ECSs to be created - 1" is greater than the specified bits, the bits of "Begin number + Number of ECSs to be created - 1" will be used.

    For example, if [begin_number,bits] is set to [8,1] and the number of ECSs to be created is 2, the bits of "Begin number + Number of ECSs to be created - 1" is the same as the specified bits (1). Then, the ECSs will be named name_prefix8name_suffix and name_prefix9name_suffix.

    If [begin_number,bits] is set to [8,1] and the number of ECSs to be created is 3, the specified bits is 1, the bits of "Begin number + Number of ECSs to be created - 1" (value 10, bits 2) is different from the specified bits (1). Therefore, the bits of "Begin number + Number of ECSs to be created - 1" will be used, which is 2.

    The ECSs will be named name_prefix08name_suffix, name_prefix09name_suffix, and name_prefix10name_suffix.

  • If the value of "Begin number + Number of ECSs to be created" is greater than the maximum value 9999, the sequential numbers that exceed 9999 will consistently to be 9999.
  • If [begin_number,bits] is set to [] or [,], the begin number starts from 0, and the number of bits is 4 by default.
  • If [begin_number,bits] is set to [99] or [99,], the begin number starts from 99, and the number of bits is 4 by default.
Custom Naming Examples
  • Example 1: If you select custom naming and enter name_prefix[,]name_suffix:

    The ECSs will be named name_prefix0000name_suffix, name_prefix0001name_suffix, name_prefix0002name_suffix, ....

  • Example 2: If you select custom naming and enter name_prefix[]name_suffix:

    The ECSs will be named name_prefix0000name_suffix, name_prefix0001name_suffix, name_prefix0002name_suffix, ....

  • Example 3: If you select custom naming and enter name_prefix[9,]name_suffix:

    The ECSs will be named name_prefix0009name_suffix, name_prefix0010name_suffix, name_prefix0011name_suffix, ....

  • Example 4: If you select custom naming and enter name_prefix[,3]name_suffix:

    The ECSs will be named name_prefix000name_suffix, name_prefix001name_suffix, name_prefix002name_suffix, ....

  • Example 5: If you select custom naming and enter name_prefix[8]name_suffix:

    The ECSs will be named name_prefix0008name_suffix, name_prefix0009name_suffix, name_prefix0010name_suffix, ....

  • Example 6: If you select custom naming and enter name_prefix[9999]name_suffix:

    All the ECSs will be named name_prefix9999name_suffix.

  • Example 7: If you select custom naming and enter name_prefix[8]:

    The ECSs will be named name_prefix0008, name_prefix0009, name_prefix0010, ....

Parent topic: ECS Creation