Cross-server Migration (rclone)

Solution Overview

You can use rclone to migrate data from a local NAS to SFS Turbo over the Internet or private network.

In this solution, to migrate data from the local NAS to the cloud, a Linux server is created both on the cloud and on-premises. Inbound and outbound traffic is allowed on port 22 of these two servers. The on-premises server is used to access the local NAS, and the ECS is used to access SFS Turbo.

You can also refer to this solution to migrate data from an on-cloud NAS to SFS Turbo over the Internet or private network.

Limitations and Constraints

• Data cannot be migrated from the local NAS to SFS Capacity-Oriented using the Internet.
• Only Linux ECSs can be used to migrate data.
• The UID and GID of your file will no longer be consistent after data migration.
• The file access modes will no longer be consistent after data migration.
• Inbound and outbound traffic must be allowed on port 22.
• Incremental migration is supported, so that only changed data is migrated.
• If data is written to the file system after you have run the rclone command to migrate data, data inconsistency may occur.

Prerequisites

• A Linux server has been created on the cloud and on-premises respectively.
• Elastic IP addresses (EIPs) have been configured for the servers to ensure that the two servers can communicate with each other.
• You have created an SFS Turbo file system and have obtained the mount point of the file system.
• You have obtained the mount point of the local NAS.

Resource Planning

Table 1 describes the resource planning in this solution.

Procedure

1. Log in to the ECS console.
2. Log in to the created on-premises server client1 and run the following command to access the local NAS:

   mount -t nfs -o vers=3,timeo=600,noresvport,nolock Mount point of the local NAS /mnt/src

3. Log in to the created Linux ECS client2 and run the following command to access the SFS Turbo file system:

   mount -t nfs -o vers=3,timeo=600,noresvport,nolock Mount point of the SFS Turbo file system  /mnt/dst

4. Run the following commands on client1 to install the rclone tool:

   wget https://downloads.rclone.org/v1.53.4/rclone-v1.53.4-linux-amd64.zip --no-check-certificate
   unzip rclone-v1.53.4-linux-amd64.zip
   chmod 0755 ./rclone-*/rclone
   cp ./rclone-*/rclone /usr/bin/
   rm -rf ./rclone-*

5. Run the following commands on client1 to configure the environment:

   rclone config
   No remotes found - make a new one
   n) New remote
   s) Set configuration password
   q) Quit config
   n/s/q> n
   name> remote name (New name)
   Type of storage to configure.
   Enter a string value. Press Enter for the default ("").
   Choose a number from below, or type in your own value
   24 / SSH/SFTP Connection
      \ "sftp"
   Storage> 24 (Select the SSH/SFTP number)
   SSH host to connect to
   Enter a string value. Press Enter for the default ("").
   Choose a number from below, or type in your own value
    1 / Connect to example.com
      \ "example.com"
   host> ip address (IP address of client2)
   SSH username, leave blank for current username, root
   Enter a string value. Press Enter for the default ("").
   user> user name (Username of client2)
   SSH port, leave blank to use default (22)
   Enter a string value. Press Enter for the default ("").
   port> 22
   SSH password, leave blank to use ssh-agent.
   y) Yes type in my own password
   g) Generate random password
   n) No leave this optional password blank
   y/g/n> y
   Enter the password:
   password: (Password for logging in to client2)
   Confirm the password:
   password: (Confirm the password)
   Path to PEM-encoded private key file, leave blank or set key-use-agent to use ssh-agent.
   Enter a string value. Press Enter for the default ("").
   key_file> (Press Enter)
   The passphrase to decrypt the PEM-encoded private key file.
    
   Only PEM encrypted key files (old OpenSSH format) are supported. Encrypted keys
   in the new OpenSSH format can't be used.
   y) Yes type in my own password
   g) Generate random password
   n) No leave this optional password blank
   y/g/n> n
   When set forces the usage of the ssh-agent.
   When key-file is also set, the ".pub" file of the specified key-file is read and only the associated key is
   requested from the ssh-agent. This allows to avoid `Too many authentication failures for *username*` errors
   when the ssh-agent contains many keys.
   Enter a boolean value (true or false). Press Enter for the default ("false").
   key_use_agent> (Press Enter)
   Enable the use of the aes128-cbc cipher. This cipher is insecure and may allow plaintext data to be recovered by an attacker.
   Enter a boolean value (true or false). Press Enter for the default ("false").
   Choose a number from below, or type in your own value
    1 / Use default Cipher list.
      \ "false"
    2 / Enables the use of the aes128-cbc cipher.
      \ "true"
   use_insecure_cipher> (Press Enter)
   Disable the execution of SSH commands to determine if remote file hashing is available.
   Leave blank or set to false to enable hashing (recommended), set to true to disable hashing.
   Enter a boolean value (true or false). Press Enter for the default ("false").
   disable_hashcheck> 
   Edit advanced config? (y/n)
   y) Yes
   n) No
   y/n> n
   Remote config
   -------------------
   [remote_name] 
   type = sftp
   host=(client2 ip)
   user=(client2 user name)
   port = 22
   pass = *** ENCRYPTED ***
   key_file_pass = *** ENCRYPTED ***
   --------------------
   y) Yes this is OK
   e) Edit this remote
   d) Delete this remote
   y/e/d> y
   Current remotes:
    
   Name                 Type
   ====                 ====
   remote_name          sftp 
    
   e) Edit existing remote
   n) New remote
   d) Delete remote
   r) Rename remote
   c) Copy remote
   s) Set configuration password
   q) Quit config
   e/n/d/r/c/s/q> q

   

   The IP address of client2 is a public IP address.

6. Run the following command to view the rclone.conf file in /root/.config/rclone/rclone.conf:

   cat /root/.config/rclone/rclone.conf
   [remote_name]
   type = sftp
   host=(client2 ip)
   user=(client2 user name)
   port = 22
   pass = ***
   key_file_pass = ***

7. Run the following command on client1 to synchronize data:

   rclone copy /mnt/src remote_name:/mnt/dst -P --transfers 32 --checkers 64

   

   • Replace remote_name in the command with the remote name in the environment.
   • Set transfers and checkers based on the system specifications. The parameters are described as follows:
     • transfers: number of files that can be transferred concurrently
     • checkers: number of local files that can be scanned concurrently
     • P: data copy progress

   After data synchronization is complete, go to the SFS Turbo file system to check whether data is migrated.

Verification

1. Log in to the created Linux ECS.
2. Run the following commands on the destination server to verify file synchronization:

   cd /mnt/dst
   ls | wc -l

3. If the data volume is the same as that on the source server, the data is migrated successfully.