# keepalived module #
Author  : Benoit CATTIE <[email protected]>
Version : 1.0
Licence : GPLv3

Basic module for configuring keepalived with puppet.

This module requires :
 - puppet-common module (http://forge.puppetlabs.com/DavidSchmitt/common)
 - stored configuration
 - Create '/var/lib/puppet/modules/keepalived/functions' directory on the puppetmaster with write permission

I m not going to explain how keepalived / IPVS works :
 - http://www.keepalived.org/documentation.html ( http://www.keepalived.org/pdf/UserGuide.pdf )

All variables without documentation in this module is documented in keepalived user guide

# Special note for DSR config on the exported real server #

This module setup loopback interface and arp config on exported real servers. 
Be carefull when the real server reboots : config is made 'on the fly'.
You can add some fixed config. In my case i construct /etc/network/interfaces using concat::fragment. So i have something like this in keepalived::virtual_server :

	@@concat::fragment{"network_interfaces_eth0-DSR-$name":
		target  => "/etc/network/interfaces",
		ensure  => present,
		content => "\t#DSR IP for $name\n\tup ip addr add ${virtual_ipaddress}/32 dev lo\n",
		order   => 'eth0_20',
		tag	=> "keepalived-exported-dsr-config-$name",
	}
with Concat::Fragment <<| tag == "keepalived-exported-dsr-config-$virtual_server_name" |>> in keepalived::exported_real_server

This config is commented in those manifests.

keepalived::arp_config class ensure arp configuration at boot time.


## Class: keepalived::server ##

install keepalived from packages
install a basic /etc/keepalived/keepalived.conf file

## Class: keepalived::arp_config ##

This class manage arp_config on the real servers using /etc/sysctl.d/ directory.

## Define: keepalived::virtual_server ##

Configure a vrrp virtual server.
Only DR mode is implemented in this module.

This definition collect all keepalived::exported_real_server to construct keepalived.conf

Variables : 
        state : MASTER or BACKUP
        virtual_router_id 	
        virtual_ipaddress	
        virtual_server_port	
        lb_kind = 'DR' : Support only DR in this version
	lb_algo = 'wlc'	
        interface = 'eth0'
        priority = '' : If not set, BACKUP will take 100 and MASTER 200



## Define: keepalived::real_server ##

Configure a vrrp real server. (not exported, see "standelone config" example)

Variables : 
        ip
        port
        virtual_server_name : name of the related keepalived::virtual_server 
        weight = '100',
        check_type : MISC_CHECK , TCP_CHECK or HTTP_GET - if not set, the check is a TCP_CHECK on $port
                check_connect_timeout = '2',
                check_nb_get_retry = '2',
                check_delay_before_retry = '2',
                check_misc_path = '', #for MISC_CHECK
                check_connect_port = '', #for TCP_CHECK and HTTP_GET
                check_url_path = '', #for HTTP_GET
                check_url_digest = '' #for HTTP_GET



## Define: keepalived::exported_real_server ##

Configure an "exported" vrrp real server. 
This real server is collected by keepalived::virtual_server

Variables : 
        $virtual_server_name : the name of the keepalived::virtual_server collecting real servers
        $port
        $weight
        $ip = "$ipaddress",
        $check_type = 'TCP_CHECK', # MISC_CHECK , TCP_CHECK or HTTP_GET - if not set, the check is a TCP_CHECK on $port
                $check_connect_timeout = '2',
                $check_nb_get_retry = '2',
                $check_delay_before_retry = '2',
                $check_misc_path = '', #for MISC_CHECK
                $check_connect_port = '', #for TCP_CHECK and HTTP_GET
                $check_url_path = '', #for HTTP_GET
                $check_url_digest = '' #for HTTP_GET
        ) {


## Sample Usage ##

# standelone config #

node vrrp_master {
        include keepalived::server

        keepalived::virtual_server{"lb_www":
                state => 'MASTER',
                virtual_router_id => "42",
                virtual_ipaddress => "192.168.0.42",
                virtual_server_port => "80",
                lb_kind => "DR",
                notification_email => "root@localhost",
        }

        keepalived::real_server{"www1":
		virtual_server_name => "lb_www",
                ip => '192.168.0.45',
                port => '80',
                weight => '100',
        }

        keepalived::real_server{"www2":
		virtual_server_name => "lb_www",
                ip => '192.168.0.46',
                port => '80',
                weight => '90',
        }

}


# with exported ressource config #



@keepalived::virtual_server{"lb_www":
        virtual_router_id => "42",
        virtual_ipaddress => "192.168.0.42",
        virtual_server_port => "80",
        lb_kind => "DR",
}

@keepalived::virtual_server{"lb_sql":
        virtual_router_id => "43",
        virtual_ipaddress => "192.168.0.43",
        virtual_server_port => "3306",
        lb_kind => "DR",
}

node vrrp_master {
	include keepalived::server
	Keepalived::Virtual_server <| title == "lb_www" |> {state => "MASTER"}
	Keepalived::Virtual_server <| title == "lb_sql" |> {state => "MASTER"}
}

node vrrp_slave {
	include keepalived::server
	Keepalived::Virtual_server <| title == "lb_www" |> {state => "BACKUP"}
	Keepalived::Virtual_server <| title == "lb_sql" |> {state => "BACKUP"}
}


node www1 {
	keepalived::exported_real_server{"$fqdn-lb_www": 
		virtual_server_name => "lb_www",
                port => '80',
                weight => '100',
	}
}

node www2 {
	keepalived::exported_real_server{"$fqdn-lb_www": 
		virtual_server_name => "lb_www",
                port => '80',
                weight => '90',
	}
}

node sql1 {
	keepalived::exported_real_server{"$fqdn-lb_sql": 
		virtual_server_name => "lb_sql",
                port => '3306',
                weight => '100',
                check_type => 'MISC_CHECK',
                check_misc_path => "/usr/local/bin/is_mysql_OK.sh $ipaddress",
	}
}

node sql2 {
	keepalived::exported_real_server{"$fqdn-lb_sql": 
		virtual_server_name => "lb_sql",
                port => '3306',
                weight => '90',
                check_type => 'MISC_CHECK',
                check_misc_path => "/usr/local/bin/is_mysql_OK.sh $ipaddress",
	}
}