I am trying to add a line in /etc/hosts file with a specific IP and a hostname. The IP is static and the hostname is retrievable from the /etc/hostname.
However, I want my root file system to be read-only.
So I get the following error:
/etc/hosts: Read-only file system
When I check with mount it is: ro.
So, I try to add /etc/hosts as an emptydir, but it is not allowed since /etc/hosts is already mounted with error:
b'linux mounts: Duplicate mount point: /etc/hosts
I am also trying to remove /etc/hosts in the dockerfile and symblink it to another file but I get the following error:
rm: cannot remove '/etc/hosts': Device or resource busy
If I don't mount as read_only the filesystem, the /etc/hosts is not rw, and I can normally make the change.
Then, the /etc/hosts is not mounted as ro but rw. So this value is inherited.
I am using kubernetes manifest or docker compose to deploy the container image and I have concluded that I need something like the --add-host in docker, but retrieve the hostname dynamically from /etc/hostname.
In `docker-compose`:
extra_hosts:
- "hostname:127.0.1.1"
In `kubernetes-yaml`:
hostAliases:
- ip: "127.0.1.1"
hostnames:
- "hostname"
Is there a way to get the hostname as a variable in docker-compose and yaml?
Is there another way to bypass the ro mounted /etc/hosts file when the rootfile system is readonly?
