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Hi all,
I have just published the release. This release is a major daemon re-design
release. This release has been sponsorized by Tiscover AG, thanks for helping
project.
The ChangeLog for the release is :
2003-05-12 Alexandre Cassen <acassen@xxxxxxxxxxxx>
* keepalived-1.0.3 released.
* This release has been sponsorized by :
Tiscover AG, <www.tiscover.com>
Please visit sponsor homepage. I would just like to
thanks their IT team for interresting design discussions
and testing time, especially Jacob Rief.
* This release consist of a major daemon re-design to
increase security and availability of Keepalived.
The daemon has been splitted into 3 distinct process.
The global design is based on a minimalistic parent
process responsible for monitoring its forked children
process. Then 2 children process, one responsible for
VRRP framework and the other for healthchecking. Each
children process has its own scheduling I/O multiplexer,
that way VRRP scheduling jitter is optimized since VRRP
scheduling must be more sensible than healthcheckers. On
the other hand this splitted design minimalize for
healthchecking the usage of foreign librairies and
minimalize its own action down to and idle mainloop in
order to avoid malfunctions caused by itself. The parent
process monitoring framework has been called watchdog,
the design is : each children process open an accept unix
domain socket, then while daemon bootstrap, parent process
connect to those unix domain socket and send periodic (5s)
hello packets to children. If parent cannot send hello
packet to remote connected unix domain socket it simply
restart children process. This watchdog design offer 2
benefit, first of all hello packets sent from parent
process to remote connected children is done throught I/O
multiplexer scheduler that way it can detect deadloop in
the children scheduling framework. The second benefit is
brought by the uses of sysV signal to detect dead children.
When running you will see in process list :
PID
111 keepalived <-- parent process monitoring child
112 \_ keepalived <-- VRRP children
113 \_ keepalived <-- Healthchecking children
* Parent : Created a global data and global keyword parser
structure.
* Healthcheck framework : Defined check_conf_data to handle
related checker data structures. Created specific checker
framework parser.
* VRRP framework : Defined vrrp_conf_data to handle related
vrrp data structures. Created specific vrrp framework parser.
* Each child process has its own syslog facility. VRRP use
LOG_LOCAL1 and Healthchecker LOG_LOCAL2. To split log you
can so configure your syslog to log both facilities in a
different logfile.
* Modularized the configuration parser to limit code
duplication.
* Created modularized software watchdog.
* Extended the recursive stream parser to use sublevel
detection while stream processing. Used to skip end-of-block
handling if still at keyword root level to prevent against
end parsing if unknown block is parsed.
* Extended pidfile framework to be more generic.
* Extended memory framework to log specific child data.
* Fixed a virtual_server_group issue while healthchecker
bringing back real_servers. Modularized virtual_server_group
API.
* Fixed a virtual_server_group issue will reloading
configuration. Remove vsgname test from the VS_ISEQ macro.
strcmp(...) comparing null pointer... this must have been
done in libc :)
* ipwrapper : set alive flag after ipvs_cmd(...) has been
performed.
* VRRP : Extended the netlink framework to support SCOPE
selection for both ipaddress and routes fonctionnalities.
SCOPE available are site, link, host, nowhere & global.
Default value is set to global.
look at doc/keepalived.conf.SYNOPSIS for more informations.
* Renamed doc/samples/keepalived.conf.routes to
doc/samples/keepalived.conf.vrrp.routes.
* Updated Makefile include dependencies.
* Vince Worthington created
'Keepalived-lvs-nat-director-proxyarp-firewall-howto'
All comments are welcome.
Best regards,
Alexandre
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