ansible-roles/ansible-dhcpd
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Merge pull request #1 from redrampage/master

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Added a failover configuration
This commit is contained in:
Maciej Delmanowski 2014-11-28 23:50:18 +01:00
commit fcf5fa2845
2 changed files with 164 additions and 0 deletions
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101
defaults/main.yml
View File

@ -161,4 +161,105 @@ dhcpd_hosts: []
dhcpd_includes: [] dhcpd_includes: []
#- '/etc/dhcp/example.conf' #- '/etc/dhcp/example.conf'
# ---- ISC DHCP failover configuration ----
#
# Each failover declaration consists of primary and secondary host, no more
# than two nodes failover is allowed by isc-dhcpd currently.
#
# You must specify which failover each pool should use by specifying a
# 'failover peer' option in pool declaration.
#
# Each failover declaration has a set of an mandatory fields, which is:
# primary: "" Ansible inventory name of a primary DHCP host, if
# you need failover to work on different IP,
# see primary_fo_addr option below.
#
# secondary: "" Ansible inventory name of a secondary DHCP host, if
# you need failover to work on different IP,
# see secondary_fo_addr option below.
#
# Ansible inventory name is either IP ot hostname specified in inventory file.
#
# mclt: 3600 Max Client Lead Time. The maximum amount of time
# that one server can extend a lease for a DHCP
# client beyond the time known by the partner server.
#
# split: [0-255] Specifies the split between the primary and
# secondary for the purposes of load balancing.
# Whenever a client makes a DHCP request, the DHCP
# server runs a hash on the client identification,
# resulting in value from 0 to 255. This is used as
# an index into a 256 bit field. If the bit at that
# index is set, the primary is responsible. If
# the bit at that index is not set, the secondary
# is responsible.
# -- or --
# hba: ([0-9a-f]{2}:){32} Specifies the split between the primary and
# secondary as a bitmap rather than a cutoff, which
# theoretically allows for finer-grained control.
# In practice, there is probably no need for such
# fine-grained control, however.
# max_response_delay: 5 Tells the DHCP server how many seconds may pass
# without receiving a message from its failover peer
# before it assumes that connection has failed.
# This is mandatory according to dhcpd.conf man page.
# max_unacked_updates: 10 Tells the remote DHCP server how many BNDUPD
# messages it can send before it receives a BNDACK
# from the local system.
# This is mandatory according to dhcpd.conf man page.
#
# You must use either 'split' or 'hba' statement. Split has a preference, so
# if it's defined, 'hba' will be omitted by configuration template.
# Optional field are mostly desribed in dhcpd.conf man page:
# port: 647 Specifies port on which primary and secondary
# nodes will listen for failover connection.
# Diffirent ports for primary and secondary is
# currently unsupported.
#
# primary_fo_addr: "" IP/Hostname of a primary DHCP host. This option
# is used if you need failover address be different
# from ansible inventory IP/hostname.
# If omitted, then 'primary' is used.
#
# secondary_fo_addr: "" IP/Hostname of a secondary DHCP host. This option
# is used if you need failover address be different
# from ansible inventory IP/hostname.
# If omitted, then 'secondary' is used.
#
# auto_partner_down: 0 Number of second to start serving partners IPs
# after the partner's failure.
#
# load_balance_max_seconds: 5
# max_lease_misbalance: 15
# max_lease_ownership: 10
# min_balance: 60
# max_balance: 3600
#
dhcpd_failovers: []
## Following is full cluster configuration
#- failover: 'failover-localsubnet'
# primary: '10.0.10.1'
# primary_fo_addr: '10.5.10.1'
# secondary: '10.0.10.2'
# secondary_fo_addr: '10.5.10.2'
# port: 1337
# split: 128
# hba: aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa:aa
# max_response_delay: 5
# max_unacked_updates: 10
# load_balance_max_seconds: 5
# auto_partner_down: 0
# max_lease_misbalance: 15
# max_lease_ownership: 10
# min_balance: 60
# max_balance: 3600
#
## Following is minimal cluster configuration
#- failover: 'failover-san'
# primary: '10.0.10.1'
# secondary: '10.0.10.2'
# mclt: 3600
# split: 128
# max_response_delay: 5
# max_unacked_updates: 10

63
templates/etc/dhcp/dhcpd.conf.j2
View File

@ -120,6 +120,64 @@ host {{ host.hostname }} {
{% endfor %} {% endfor %}
{% endif %} {% endif %}
{% endmacro %} {% endmacro %}
{% macro print_failover(failover) %}
{% if failover.comment is defined and failover.comment %}
# {{ failover.comment }}
{% endif %}
failover peer "{{ failover.failover }}" {
{% if failover.primary is defined and failover.primary == inventory_hostname %}
primary;
mclt {{ failover.mclt|default(3600) }};
{% if failover.primary_fo_addr is defined and failover.primary_fo_addr %}
address {{ failover.primary_fo_addr }};
{% else %}
address {{ failover.primary }};
{% endif %}
{% if failover.secondary_fo_addr is defined and failover.secondary_fo_addr %}
peer address {{ failover.secondary_fo_addr }};
{% else %}
peer address {{ failover.secondary }};
{% endif %}
{% if failover.split is defined and failover.split %}
split {{ failover.split }};
{% elif failover.hba is defined and failover.hba %}
hba {{ failover.hba }};
{% endif %}
{% else %}
secondary;
{% if failover.secondary_fo_addr is defined and failover.secondary_fo_addr %}
address {{ failover.secondary_fo_addr }};
{% else %}
address {{ failover.secondary }};
{% endif %}
{% if failover.primary_fo_addr is defined and failover.primary_fo_addr %}
peer address {{ failover.primary_fo_addr }};
{% else %}
peer address {{ failover.primary }};
{% endif %}
{% endif %}
max-response-delay {{ failover.max_response_delay|default(30) }};
max-unacked-updates {{ failover.max_unacked_updates|default(10) }};
{% if failover.load_balance_max_seconds is defined and failover.load_balance_max_seconds %}
load balance max seconds {{ failover.load_balance_max_seconds }};
{% endif %}
{% if failover.max_lease_misbalance is defined and failover.max_lease_misbalance %}
max-lease-misbalance {{ failover.max_lease_misbalance }};
{% endif %}
{% if failover.max_lease_ownership is defined and failover.max_lease_ownership %}
max-lease-ownership {{ failover.max_lease_ownership }};
{% endif %}
{% if failover.min_balance is defined and failover.min_balance %}
min-balance {{ failover.min_balance }};
{% endif %}
{% if failover.max_balance is defined and failover.max_balance %}
max-balance {{ failover.max_balance }};
{% endif %}
{% if failover.auto_partner_down is defined and failover.auto_partner_down %}
auto-partner-down {{ failover.auto_partner_down }};
{% endif %}
}
{% endmacro %}
{% if dhcpd_authoritative is defined and dhcpd_authoritative %} {% if dhcpd_authoritative is defined and dhcpd_authoritative %}
authoritative; authoritative;
@ -143,6 +201,11 @@ not authoritative;
{{ print_class(class) }} {{ print_class(class) }}
{% endfor %} {% endfor %}
{% endif %} {% endif %}
{% if dhcpd_failovers is defined and dhcpd_failovers %}
{% for failover in dhcpd_failovers %}
{{ print_failover(failover) }}
{% endfor %}
{% endif %}
{% if dhcpd_shared_networks is defined and dhcpd_shared_networks %} {% if dhcpd_shared_networks is defined and dhcpd_shared_networks %}
{% for network in dhcpd_shared_networks %} {% for network in dhcpd_shared_networks %}
{% if network.subnets is defined and network.subnets %} {% if network.subnets is defined and network.subnets %}