Ansible templates. Joining item vars on one line with static text.

[Michael Starling]

Hello.

Consider I have this variable list that can contain as little as 1 and up to 4 items.

ldapservers:
    - server1
    - server2


Consider this line in my ldap.conf template.

URI ldap://{{ ldapservers(' ') }}/


I would like the resulting file to look like this:

URI ldap://server1/ ldap://server2/

I know I can use "join" with something like this, but how do I keep the "URI" the " ldap://" and the trailing "/" consistent without adding them to the variable.

URI ldap://{{ ldap_srv_fqdn|join(' ') }}/

Thanks in advance.

Mike

[Will McDonald]

There may be more elegant ways to achieve this, but I had a similar requirement from some Eventstore config a while back and ended up with a construct like:

# Construct each GossipSeed from ansible_play_hosts minus the inventory_host
{%- set seeds = [] %}
{%- for host in ansible_play_hosts %}
  {%- if host != inventory_hostname %}
    {{ seeds.append(hostvars[host]['ansible_host'] ~ ':2113') }}
  {%- endif %}
{%- endfor %}

GossipSeed: {{ seeds | join(',') }}

In your case you could maybe do something like (untested):

# Construct list of LDAP server URIs
{%- set ldap_sever_list = [] %}
{%- for server in ldapservers %}
    {{ ldap_sever_list.append('ldap://' ~ server ~ '/') }}
{%- endfor %}

URI: {{ ldap_server_list | join(',') }}

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[Vladimir Botka]

On Sun, 18 Aug 2024 09:45:11 -0400
Michael Starling <sturnis...@gmail.com> wrote:

> ldapservers:
> - server1
> - server2
>

> I would like the resulting file to look like this:
>
> URI ldap://server1/ ldap://server2/

Put the below declarations as appropriate

ldapservers: [server1, server2]
uri: "{{ ['ldap://'] |
product(ldapservers) | map('join') |
product(['/'])| map('join') |
join(' ') }}"

Then, the template is trivial

- copy:
content: |
URI {{ uri }}
dest: /tmp/uri.test

gives what you want

shell> cat /tmp/uri.test

URI ldap://server1/ ldap://server2/

HTH,

--
Vladimir Botka

[Vladimir Botka]

On Sun, 18 Aug 2024 15:11:11 +0100
Will McDonald <wmcd...@gmail.com> wrote:

> There may be more elegant ways to achieve this

The below declaration should to the job

seeds: "{{ ansible_play_hosts |
difference([inventory_hostname]) |
map('extract', hostvars, 'ansible_host') |
product([':2113']) |
map('join') |
join(',') }}"

> {%- set seeds = [] %}
> {%- for host in ansible_play_hosts %}
> {%- if host != inventory_hostname %}
> {{ seeds.append(hostvars[host]['ansible_host'] ~ ':2113') }}
> {%- endif %}
> {%- endfor %}
>
> GossipSeed: {{ seeds | join(',') }}

For example, given the inventory


shell> cat hosts
host_A ansible_host=10.1.0.51
host_B ansible_host=10.1.0.52
host_C ansible_host=10.1.0.53

the below play

- hosts: all
vars:
seeds: "{{ ansible_play_hosts |
difference([inventory_hostname]) |
map('extract', hostvars, 'ansible_host') |
product([':2113']) |
map('join') |
join(',') }}"
tasks:
- debug:
var: seeds

gives (abridged)

ok: [host_A] =>
seeds: 10.1.0.53:2113,10.1.0.52:2113
ok: [host_B] =>
seeds: 10.1.0.53:2113,10.1.0.51:2113
ok: [host_C] =>
seeds: 10.1.0.51:2113,10.1.0.52:2113

HTH,

--
Vladimir Botka

[Michael Starling]

Thank you both for the suggestions. Much appreciated.

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