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ucarp
Langue: en
Version: 303503 (debian - 07/07/09)
Section: 8 (Commandes administrateur)
NAME
ucarp --- Automatic IP failoverSYNOPSIS
ucarp [-i, --interface=INTERFACE] [-s, --srcip=IPADDRESS]
[-v, --vhid=VHID] [-p, --pass=PASSWORD] [-o, --passfile=PASSFILE]
[-P, --preempt] [-n, --neutral] [-a, --addr=IPADDR] [-h, --help]
[-b, --advbase=SECS] [-k, --advskew=SKEW] [-u, --upscript=SCRIPT]
[-d, --downscript=SCRIPT] [-r, --deadratio=RATIO] [-z, --shutdown]
[-B, --daemonize] [-f, --facility=FACILITY] [-x, --xparam PARAM] [-S, --ignoreifstate]
DESCRIPTION
ucarp allows a pair of hosts to share common IP addresses in order to provide automatic failover of an address from one machine to another. It is a portable userland implementation of the secure and patent-free Common Address Redundancy Protocol, (CARP), OpenBSD's alternative to VRRP.
OPTIONS
ucarp supports the following command line options:
- -i INTERFACE --interface=INTERFACE
- The network interface to bind to.
- -s IPADDRESS --srcip=IPADDRESS
- The persistent source address, (real IP), associated with this interface.
- -v VHID --vhid=VHID
- The id of the virtual server [1-255].
- -p PASSWORD --pass=PASSWORD
- The shared password, (this gets encrypted and is not sent in the clear).
- -o PASSFILE --passfile=PASSFILE
- File to read the shared password from. The file specified should contain the password on the first line of the file.
- -P --preempt
- Turn on preemptive failover. This causes an instance of ucarp to assume master status right immediately.
- -n --neutral
- Do not run the downscript on startup when the initial state is backup.
- -a IPADDRESS --addr=IPADDRESS
- The IP address of the virtual server.
- -h --help
- Display a brief summary of the command line options.
- -b SECONDS --advbase=SECONDS
- Interval in seconds that advertisements will occur, (defaults to 1 second).
- -k SKEW --advskew=SKEW
- Advertisement skew [1-255], (defaults to 0).
- -u COMMAND --upscript=COMMAND
- Specifies the command to run after ucarp has successfully become master, the interface name gets passed as an argument. Typically a script used to bring up the virtual address, log the result, add routes, clear arp cache entries, etc.
- -d COMMAND --downscript=COMMAND
- Specifies the command that is run after ucarp has transitioned to the backup state, the interface name is passed as an argument. This is typically a script used to bring down the virtual interface, log the action, remove routes, etc.
- -r RATIO --deadratio=RATIO
- Ratio used by the backup to determine how long to wait for an unresponsive master before considering it dead.
- -z --shutdown
- Use of this command causes the command specified by the -d argument to be invoked when ucarp shuts down.
- -B --daemonize
- Causes ucarp to detach from the terminal and run in the background as a daemon.
- -f --facility
- Set the syslog facility, defaults to daemon.
- -x PARAMETER --xparam=PARAMETER
- Specify an extra parameter to be supplied to the up/down scripts.
- -S --ignoreifstate
- Ignore unplugged network cables. This option is useful when ucarp nodes are connected with a crossover cable. Without this option the master will transition to backup when the other node is powered down, as it no longer has a link (NO-CARRIER).
EXAMPLES
A host with a real IP of 10.1.1.10 configured to be the master in a preemptive configuration with a virtual IP of 10.1.1.252.
ucarp -i eth0 -s 10.1.1.10 -v 10 -p secret -a 10.1.1.252 \ --upscript=/etc/vip-up.sh --downscript=/etc/vip-down.sh -P
The backup might be configured something like this.
ucarp -i eth0 -s 10.1.1.11 -v 10 -p secret -a 10.1.1.252 \ --upscript=/etc/vip-up.sh --downscript=/etc/vip-down.sh
A machine with a real IP of 192.168.1.19 is the preferred master for a virtual IP of 10.1.12.7, broadcasts are sent every 5 seconds.
ucarp -b 5 -s 192.168.1.19 -v 27 -p badpass -a 10.1.12.7 \ -u /etc/vip-up.sh -d /etc/vip-down.sh -z
The hot standby with an IP of 192.168.1.20 uses the following command, (note the advskew of 50 putting it at a disadvantage and making the first machine preferred).
ucarp -b 5 -k 50 -s 192.168.1.20 -v 27 -p badpass -a 10.1.12.7 \ -u /etc/vip-up.sh -d /etc/vip-down.sh -z
AUTHOR
ucarp was written by Frank Denis, <j@ucarp.org>.
This manual page was written by Eric Evans <eevans@debian.org> for the Debian system (but may be used by others). Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any later version published by the Free Software Foundation.
On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre