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    Modifying etc/hosts Configuration of Linux Instance

    Last updated: 2024-01-06 17:38:11
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      Overview

      From March 1, 2018, the Linux public image provided by Tencent Cloud has the open-source tool Cloud-Init pre-installed, and all initialization operations on an instance are done via Cloud-Init, making operations inside the instance more transparent. For more information, see Cloud-Init and Cloudbase-Init. In each launch, Cloud-Init generates a new /etc/hosts file according to the /etc/cloud/templates/hosts.${os_type}.tmpl template and overwrites the original /etc/hosts file of the instance involved. Hence, after you manually modify the internal /etc/hosts configuration of the instance and restart it, the /etc/hosts configuration goes back to the original default configuration.

      Precautions

      Tencent Cloud has fixed this problem for instances created by using a public image after September 2018, and the /etc/hosts configuration will not be overwritten. For instance created before September 2018, follow the steps below for modification.

      Directions

      Solution 1

      1. Log in to the Linux CVM.
      2. Execute the following command to change the - update_etc_hosts in the /etc/cloud/cloud.cfg configuration file to - ['update-etc-hosts', 'once-per-instance']:
      sed -i "/update_etc_hosts/c \\ - ['update_etc_hosts', 'once-per-instance']" /etc/cloud/cloud.cfg
      3. Execute the following command to create a config_update_etc_hosts file under the /var/lib/cloud/instance/sem/ path:
      touch /var/lib/cloud/instance/sem/config_update_etc_hosts

      Solution 2

      Note:
      This solution takes the CentOS 7.2 operating system as an example.

      Obtaining the hosts template file path

      1. Log in to the Linux CVM.
      2. Execute the following command to view the system hosts template file:
      cat /etc/hosts
      The hosts template file is as shown in the following figure:
      
      

      Modifying the hosts template file

      Note:
      Taking adding 127.0.0.1 test test as an example, you can modify the hosts template and /etc/hosts file as needed.
      1. Execute the following command to modify the hosts template file:
      vim /etc/cloud/templates/hosts.redhat.tmpl
      2. Press i to switch to the editing mode.
      3. Add the following content to the end of the file:
      127.0.0.1 test test
      4. Press Esc and enter :wq to save and close the file.

      Modifying the /etc/hosts file

      1. Execute the following command to modify the /etc/hosts file:
      vim /etc/hosts
      2. Press i to switch to the editing mode.
      3. Add the following content to the end of the file:
      127.0.0.1 test test
      4. Press Esc and enter :wq to save and close the file.
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