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:
