Procedure

1. Check whether the Docker Device Mapper mode on a node is direct-lvm.

   Method 1:

   1. Log in to a node on which you want to view the Docker Device Mapper mode.
   2. Enter the following command to view the configuration information under Storage Driver.
      docker info

      • If the values of the Data file and Metadata file parameters under Storage Driver are /dev/loopx, the Docker Device Mapper mode of the current node is loop-lvm. Change the mode by following 2.

        Example:

        

      • If the values of the Data file and Metadata file parameters under Storage Driver are left blank and the value of Pool Name is vgpaas-thinpool, the Docker Device Mapper mode of the current node is direct-lvm. You do not need to change the mode.

        Example:

        

   Method 2:

   1. Log in to a node on which you want to view the Docker Device Mapper mode.
   2. Enter the following command and check whether the command output contains the information listed below:
      cat /etc/docker/daemon.json

      "dm.thinpooldev=/dev/mapper/vgpaas-thinpool"

      • If the command output contains the preceding information, the Docker Device Mapper mode of the current node is direct-lvm. You do not need to change the mode.
      • If the command output does not contain the preceding information or a message indicating that a file such as daemon.json is unavailable is displayed, the Docker Device Mapper mode of the current node is not direct-lvm. Change the mode by following 2.

2. (Optional) If no elastic IP address is bound to the node for which the Docker Device Mapper mode needs to be changed, bind an elastic IP address.
3. Log in to the node with an elastic IP address as the root user.
4. Create a configuration file.

   touch config.yaml

5. Copy the following content to the configuration file:

   user:
     domainName: 
     username: 
     password: 
     projectName: 
   apiGatewayIp: 
   iamHostname: 
   ecsHostname: 
   evsHostname: 
   swrAddr: 
   defaultPassword: 
   defaultPrivateKey: 
   hosts:
     - host: <node_ip_01>
       user: root
       password: 
       privateKey:
       serverId: 
     - host: <node_ip_02>
       user: root
       password: 
       privateKey: 
       serverId:

   Table 1 Parameter description

   Parameter		Description	Example
   domainName		Tenant name	-
   username		User name	-
   password		User password, which is enclosed in quotation marks ('' '')	-
   projectName		Name of the project to which the to-be-configured node belongs	cn-north-4
   apiGatewayIp		IP address of an API gateway	-
   iamHostname		Endpoint of the IAM service Query the endpoint through Regions and Endpoints.	iam.cn-north-4.myhuaweicloud.com
   ecsHostname		Endpoint of the ECS service Query the endpoint through Regions and Endpoints.	ecs.cn-north-4.myhuaweicloud.com
   evsHostname		Endpoint of the EVS service Query the endpoint through Regions and Endpoints.	evs.cn-north-4.myhuaweicloud.com
   swrAddr		Address of a software repository	-
   defaultPassword		(Optional) Default login password of a node. The value must be enclosed in quotation marks ('' '').	-
   defaultPrivateKey		(Optional) Absolute path to the default key file for logging in to a node. The value must be enclosed in quotation marks ('' '').	-
   hosts		Host array structure [1]. You can set multiple nodes for which you want to change the Device Mapper mode. The following parameters must be included: user, password/privateKey, and serverId. For details about the host array structure, see Table 2.	-

   Table 2 Parameter description about the host array structure

   Parameter	Description	Example
   host	IP address of the node for which you want to change the Device Mapper mode. This node must be in the same subnet as the current logged-in node.	-
   user	User name. Set this parameter to root.	-
   password	Password for the root user on the node for which you want to change the Device Mapper mode. The value must be enclosed in quotation marks ('' ''). NOTE: Set either password or privateKey.	-
   privateKey	Absolute path to the key file of the root user on the node for which you want to change the Device Mapper mode. The value must be enclosed in quotation marks ('' ''). NOTE: Set either password or privateKey.	-
   serverId	ID of the ECS corresponding to the node for which you want to change the Device Mapper mode	076311b7-4c05-48f6-ba27-f0cfe29d424f

6. Modify the configuration of the nodes in the cluster.

   It takes about 3 to 5 minutes to configure a node.

   curl -k https://<swr-address>:20202/swr/v2/domains/op_svc_servicestage/namespaces/op_svc_servicestage/repositories/default/packages/cluster-versions/versions/base/file_paths/cceadm -1 -O;chmod u+x cceadm; ./cceadm batch-config-docker --conf=./config.yaml

   Replace <swr-address> with the address of a software repository, which is the same as the value of swrAddr in Table 1.