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Help Center/ Elastic Cloud Server/ Troubleshooting/ Configuring the Network/ Why Does My ECS Running CentOS 7 Fail to Obtain an IP Address Using dhclient?

Why Does My ECS Running CentOS 7 Fail to Obtain an IP Address Using dhclient?

Updated on 2023-03-30 GMT+08:00

Symptom

After an ECS was started, it failed to obtain an IP address because dhclient did not run.

Possible Causes

The possible causes are as follows:

  1. NetworkManager is not configured to start at boot.
  2. The target NIC is not managed by NetworkManager.

Constraints

The operations described in this section apply to ECSs running CentOS 7 series, EulerOS 2 series, or Ubuntu 18.04.

Solution

  1. Run the following command to check whether dhclient is running:

    # ps -ef |grep dhclient |grep -v grep

  2. If dhclient is not detected, run the following command to check whether NetworkManager is running:

    # systemctl status NetworkManager

    • If NetworkManager is in Active: inactive (dead) state, NetworkManager is not enabled. Run the following command to check whether NetworkManager is automatically started upon system startup:

      # systemctl is-enabled NetworkManager

      If the command output is disabled, run the following command to make NetworkManager start at boot automatically:

      # systemctl enable NetworkManager && systemctl start NetworkManager

    • If NetworkManager is in Active: active (running) state, run the following command to check whether the target NIC is managed by NetworkManager:

      # nmcli device status

      If the NIC is in unmanaged state, run the following command to make NetworkManager manage the NIC:

      # nmcli device set eth0 managed yes

  3. Restart NetworkManager.

    # systemctl restart NetworkManager

  4. Run the following command to check whether the private IP address can be allocated:

    # ip add

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