Help Center> Cloud Data Migration> User Guide> Permissions Management> Creating a Custom Policy
Updated on 2022-08-15 GMT+08:00
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Creating a Custom Policy

Custom policies can be created to supplement the system-defined policies of CDM. For the actions that can be added to custom policies, see Permissions Policies and Supported Actions.

You can create custom policies in either of the following ways:

  • Visual editor: Select cloud services, actions, resources, and request conditions. This does not require knowledge of policy syntax.
  • JSON: Edit JSON policies from scratch or based on an existing policy.

For details, see Creating a Custom Policy. The following section contains examples of common CDM custom policies.

Example Custom Policies

  • Example 1: Allowing users to create a CDM cluster
    {
    "Version": "1.1",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "cdm:cluster:create"
            ]
        }
    ]
}
  • Example 2: Denying CDM cluster deletion

    A policy with only "Deny" permissions must be used in conjunction with other policies to take effect. If the permissions assigned to a user contain both "Allow" and "Deny", the "Deny" permissions take precedence over the "Allow" permissions.

    The following method can be used if you need to assign permissions of the CDM FullAccess policy to a user but you want to prevent the user from deleting CDM clusters. Create a custom policy for denying CDM cluster deletion, and attach both policies to the group to which the user belongs. Then, the user can perform all operations on CDM resources except deleting CDM clusters. The following is an example of a deny policy:

    {
    "Version": "1.1",
    "Statement": [
        {
            "Effect": "Deny",
            "Action": [
                "cdm:cluster:delete"
            ]
        }
    ]
}
  • Example 3: Defining permissions for multiple services in a policy

    A custom policy can contain actions of multiple services that are of the global or project-level type. The following is an example policy containing actions of multiple services:

    {
        "Version": "1.1",
        "Statement": [
                {
                        "Action": [
                                "cdm:cluster:list",
                                "cdm:cluster:get",
                                "ecs:*:get*",
                                "ecs:*:list*",
                                "vpc:*:get*",
                                "vpc:*:list*",
                                "evs:*:get*",
                                "evs:*:list*",
                                "bss:*:view*"
                        ],
                        "Effect": "Allow"
                }
        ]
}
Parent topic: Permissions Management