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Updated on 2023-10-31 GMT+08:00
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How Can I Log In to an ECS After It Exchanged the System Disk with Another ECS Running the Same OS?

Symptom

Two ECSs run the same OS, for example, both run Linux. The system disks attached to the two stopped ECSs are exchanged. After the exchange, the passwords or keys used to log in to the ECSs may change. In this case, how do I log in to the ECS whose system disk has been replaced?

Linux

Login methods vary according to the login authentication used on the ECSs. Assume that there are three Linux ECSs and they are configured as shown in Table 1.

Table 1 ECS configurations

ECS

System Disk

Login Authentication

Password/Key Pair

ecs_01

vol_01

Password or key pair

If a password is used for login authentication, take Ecs@01 as an example.

If a key pair is used for login authentication, take private key file Keypair_01 as an example.

ecs_02

vol_02

Password

Ecs@02

ecs_03

vol_03

Key pair

Keypair_03
  • Scenario 1: System disk vol_01 is detached from ecs_01 offline and then attached to ecs_02 as the system disk. How can I log in to ecs_02?

    Use either of the following methods to log in to ecs_02:

    • Use private key file Keypair_01 (if available) of ecs_01.
    • Use the original password Ecs@02 of ecs_02.
  • Scenario 2: System disk vol_01 is detached from ecs_01 offline and then attached to ecs_03 as the system disk. How can I log in to ecs_03?

    Use one of the following methods to log in to ecs_03:

    • Use the password Ecs@01 (if available) of ecs_01.
    • Use private key file Keypair_01 (if available) of ecs_01.
    • Use private key file Keypair_03 of ecs_03.
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