189 lines
4.6 KiB
Python
189 lines
4.6 KiB
Python
#
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# CORE configuration for UCARP
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# Copyright (c) 2012 Jonathan deBoer
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# See the LICENSE file included in this distribution.
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#
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#
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# author: Jonathan deBoer <jdccdevel@gmail.com>
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#
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'''
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ucarp.py: defines high-availability IP address controlled by ucarp
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'''
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import os
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from core.service import CoreService, addservice
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from core.misc.ipaddr import IPv4Prefix
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from core.constants import *
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UCARP_ETC="/usr/local/etc/ucarp"
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class Ucarp(CoreService):
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'''
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'''
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_name = "ucarp"
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_group = "Utility"
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_depends = ( )
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_dirs = (UCARP_ETC, )
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_configs = (UCARP_ETC + "/default.sh", UCARP_ETC + "/default-up.sh", UCARP_ETC + "/default-down.sh", "ucarpboot.sh",)
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_startindex = 65
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_startup = ("sh ucarpboot.sh",)
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_shutdown = ("killall ucarp", )
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_validate = ("pidof ucarp", )
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@classmethod
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def generateconfig(cls, node, filename, services):
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''' Return the default file contents
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'''
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if filename == cls._configs[0]:
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return cls.generateUcarpConf(node, services)
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elif filename == cls._configs[1]:
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return cls.generateVipUp(node, services)
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elif filename == cls._configs[2]:
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return cls.generateVipDown(node, services)
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elif filename == cls._configs[3]:
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return cls.generateUcarpBoot(node, services)
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else:
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raise ValueError
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@classmethod
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def generateUcarpConf(cls, node, services):
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''' Returns configuration file text.
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'''
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try:
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ucarp_bin = node.session.cfg['ucarp_bin']
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except KeyError:
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ucarp_bin = "/usr/sbin/ucarp"
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return """\
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#!/bin/sh
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# Location of UCARP executable
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UCARP_EXEC=%s
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# Location of the UCARP config directory
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UCARP_CFGDIR=%s
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# Logging Facility
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FACILITY=daemon
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# Instance ID
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# Any number from 1 to 255
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INSTANCE_ID=1
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# Password
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# Master and Backup(s) need to be the same
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PASSWORD="changeme"
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# The failover application address
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VIRTUAL_ADDRESS=127.0.0.254
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VIRTUAL_NET=8
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# Interface for IP Address
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INTERFACE=lo
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# Maintanence address of the local machine
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SOURCE_ADDRESS=127.0.0.1
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# The ratio number to be considered before marking the node as dead
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DEAD_RATIO=3
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# UCARP base, lower number will be preferred master
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# set to same to have master stay as long as possible
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UCARP_BASE=1
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SKEW=0
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# UCARP options
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# -z run shutdown script on exit
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# -P force preferred master
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# -n don't run down script at start up when we are backup
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# -M use broadcast instead of multicast
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# -S ignore interface state
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OPTIONS="-z -n -M"
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# Send extra parameter to down and up scripts
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#XPARAM="-x <enter param here>"
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XPARAM="-x ${VIRTUAL_NET}"
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# The start and stop scripts
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START_SCRIPT=${UCARP_CFGDIR}/default-up.sh
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STOP_SCRIPT=${UCARP_CFGDIR}/default-down.sh
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# These line should not need to be touched
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UCARP_OPTS="$OPTIONS -b $UCARP_BASE -k $SKEW -i $INTERFACE -v $INSTANCE_ID -p $PASSWORD -u $START_SCRIPT -d $STOP_SCRIPT -a $VIRTUAL_ADDRESS -s $SOURCE_ADDRESS -f $FACILITY $XPARAM"
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${UCARP_EXEC} -B ${UCARP_OPTS}
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""" % (ucarp_bin, UCARP_ETC)
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@classmethod
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def generateUcarpBoot(cls, node, services):
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''' Generate a shell script used to boot the Ucarp daemons.
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'''
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try:
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ucarp_bin = node.session.cfg['ucarp_bin']
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except KeyError:
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ucarp_bin = "/usr/sbin/ucarp"
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return """\
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#!/bin/sh
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# Location of the UCARP config directory
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UCARP_CFGDIR=%s
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chmod a+x ${UCARP_CFGDIR}/*.sh
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# Start the default ucarp daemon configuration
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${UCARP_CFGDIR}/default.sh
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""" % (UCARP_ETC)
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@classmethod
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def generateVipUp(cls, node, services):
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''' Generate a shell script used to start the virtual ip
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'''
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try:
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ucarp_bin = node.session.cfg['ucarp_bin']
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except KeyError:
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ucarp_bin = "/usr/sbin/ucarp"
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return """\
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#!/bin/bash
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# Should be invoked as "default-up.sh <dev> <ip>"
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exec 2> /dev/null
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IP="${2}"
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NET="${3}"
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if [ -z "$NET" ]; then
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NET="24"
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fi
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/sbin/ip addr add ${IP}/${NET} dev "$1"
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"""
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@classmethod
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def generateVipDown(cls, node, services):
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''' Generate a shell script used to stop the virtual ip
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'''
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try:
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ucarp_bin = node.session.cfg['ucarp_bin']
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except KeyError:
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ucarp_bin = "/usr/sbin/ucarp"
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return """\
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#!/bin/bash
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# Should be invoked as "default-down.sh <dev> <ip>"
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exec 2> /dev/null
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IP="${2}"
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NET="${3}"
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if [ -z "$NET" ]; then
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NET="24"
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fi
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/sbin/ip addr del ${IP}/${NET} dev "$1"
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"""
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addservice(Ucarp)
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