Hosts file can generate duplicate entry weirdness about ansible-lxc-rpc HOT 6 CLOSED

andymcc: I'm not sure we can fix this in a sensible way since some hosts will have the same IP (nova-compute and a physical host, for example) - I think we are better off investigating how to prevent "unmanaged" nodes (nodes not in the inventory) from existing. So guarding against having 2 different inventory files (different sets of containers on the same IPs etc).

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apsu: It might help to provide another bit of context to consider here.

Ansible used to ship a "host" module which would attempt to manage your /etc/hosts file for you. Our own dear claco pointed out an issue with how it handled aliases -- exactly as you're seeing even with just lineinfile -- and the module got pulled from Ansible and hasn't yet been replaced.

The usual solution I see in playbooks for dealing with /etc/hosts is to use a template and render it with exactly the contents that host should have, rather than lineinfile.

That said... if you Want the old host module to poke at, I actually have it stashed away in my ansible fork I use with my dockerlab/virtlab repos, since I find it useful for most /etc/hosts tasks. It's located here: https://github.com/Apsu/ansible/blob/dockerlab/library/system/host

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claco: Some people who have simple needs, use the 'line in file' module with regex/replace.

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andymcc: PR'd against this on new repo #1

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andymcc: Fixed in local branch: Fixed in local branch: https://github.com/andymcc/ansible-lxc-rpc/tree/hosts_duplicate

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Can this issue be closed?

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