Configuring HAProxy for LDAP access

[mboisson]

In our cloud, if a VM has a public IP, all connections go through the public IP. When authenticating against an external LDAP, this means that the LDAP firewall configuration needs to be adjusted every time we add a new public VM. A better solution would be to run an HAProxy service on one of the internal nodes (mgmt1, puppet1, or dedicated node) which does not have a public IP. Communications of those VMs all go through the project's router, and the LDAP would only need to be open from the project's LDAP router.

Documentation on configuring a HAProxy service is available on this internal page:
https://wiki.alliancecan.ca/wiki/LDAP_HAProxy

[mboisson]

This existing puppet module might be useful:
https://forge.puppet.com/modules/puppetlabs/haproxy/readme

[mboisson]

I ended up creating it with the above puppet module, with:

an instance

haproxy  = { type = "p2-3gb", tags = ["haproxy"], count = 1 }

in my main.tf, adding

`mod 'puppetlabs-haproxy', '8.0.0'`

to my Puppetfile, and then in my yaml files:

magic_castle::site::tags:
  haproxy:
    - haproxy

profile::sssd::client::domains:
  CCLDAP:
    id_provider: ldap
    auth_provider: ldap
    ldap_schema: rfc2307
    ldap_uri:
      - ldaps://haproxy1
    .....

haproxy::merge_options: false
haproxy::defaults_options:
  log: global
  option: ['tcplog', 'tcpka']
  balance: first
  timeout server: 1800s
  timeout connect: 2s
  mode: tcp

haproxy::custom_fragment: |

  frontend ldaps_service_front
    mode                  tcp
    bind                  %{lookup('terraform.self.local_ip')}:636
    description           LDAPS Service
    option                socket-stats
    option                tcpka
    timeout client        3600s
    default_backend       ldaps_service_back

  backend ldaps_service_back
    server                ldap-1 <server1>:636 check fall 1 rise 1 inter 2s
    server                ldap-2 <server1>:636 check fall 1 rise 1 inter 2s
    option                ssl-hello-chk