I have three containers of the same image deployed in the same host, how to do the mounting?

[meyay (Metin Y.)]

You might want to try service template placeholders in your volume mapping.
I did use {{.Task.Slot}} as a postfix to volume paths in the past, though I don’t recall the exact usage.
Probably it was on the right hand side of the mapping, in combination with an env variable to set the target folder in the container.

see:

Example usage of docker swarm template placeholders

Today I was playing around with mounting cifs shares into a container and figured I’d like to include the namespace to the mounted path. That made me play with the known swarm template variables (docker service create | Docker Documentation). I found the template command for X_SERVICE_LABEL_STACK_NAMESPACE usefull in my endover to have stack name specific mounts Maybee this information is usefull to others as well. The stack is called ‘test’. version: '3.7' services: ubuntu: …

Though, the easiest approach would be to make the hostname of the container part of the filename of the logs.