Merging lists from group_vars

[Guy Knights]

Is there any way to merge lists from group_vars, much like hash_behaviour = merge, but for lists? From what I can tell, there is no explicit list_behaviour option I can set, but is there perhaps a manual way I can do this? I have a firewall configuration that uses group_vars to define the rules that are applied to each type of server, but now I'm trying to provision a server that is a member of multiple groups and it's only applying the rules from the last group that it belongs to. One way around my issue is to explicitly specify the rules in a host_vars file for this server only, but it feels a bit redundant; I'd really prefer if the rule lists could be combined from all groups this server belongs to as then I wouldn't have to go through each group and manually combine the lists in the host_vars file.

Thanks,

Guy

[Jesse Schlüter]

I don't know whether this works in your case, but we worked around, by creating different lists and manually merging them together:

type_policy1:

  - whatever

  - your

  - policy

type_policy2:

  - list
  - looks

  - like

host_policy: '{{ policies1 + policies2 }}'