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Hi all,
I have just uploaded the new release to the master website. The release
focus is VRRP, adding a new TSM design (Transition State Matrix) that speed
state transition synchronization and reduce repeated code. Review the whole
FSM to fixe all junky flapping issue. All this listening manu chao and
radio bemba !! :))
The ChangeLog for the release is :
2002-09-17 Alexandre Cassen <acassen@xxxxxxxxxxxx>
* keepalived-0.7.1 released.
* Fixed a MISC_CHECK issue when registering next timer checker. Must
register a new timer thread before forking process. This imply for
the user the extra script call must not execute in more than
checker->vs->delay_loop.
* Extented the ipfwwrapper (for LVS kernel 2.2) to not set ipchains
rules if nat_mask is not specified in the configuration file.
* VRRP : Added support to delayed gratuitous ARP send. When one
instance
enter to MASTER state a timer thread is registered. The default
delay
is 5secs. This delay is configurable per vrrp instance and
handle the
'garp_master_delay' keyword. This delay refer to the delay after
MASTER state transition we want to launch gratuitous ARP.
* VRRP : Force health checker enable flag if VRRP framework is not
selected.
* VRRP : Review the gratuitous ARP helper function to only send
gratuitous ARP if VRRP VIPs are set.
* VRRP : Review the FSM to eliminate stalled flapping loop. The state
transition diagram implemented is :
+---------------+
+----------------| |----------------+
| | Fault | |
| +------------>| |<------------+ |
| | +---------------+ | |
| | | | |
| | V | |
| | +---------------+ | |
| | +--------->| |<---------+ | |
| | | | Initialize | | | |
| | | +-------| |-------+ | | |
| | | | +---------------+ | | | |
| | | | | | | |
V | | V V | | V
+---------------+ +---------------+
| |---------------------->| |
| Master | | Backup |
| |<----------------------| |
+---------------+ +---------------+
The state DUMMY_MASTER state has been removed since it is a fake.
* VRRP : In order to handle all possible state transition, a
Transition
State Matrix design (TSM) has been added. This matrix defines
transition state handlers for VRRP sync group extension. The TSM
implemented is (cf: vrrp_scheduler.c for more informations) :
\ E | B | M | F |
S \ | | | |
------+-----+-----+-----+ Legend:
B | x 1 2 | B: VRRP BACKUP state
------+ | M: VRRP MASTER state
M | 3 x 4 | F: VRRP FAULT state
------+ | S: VRRP start state (before
transition)
F | 5 6 x | E: VRRP end state (after transition)
------+-----------------+ [1..6]: Handler functions.
* VRRP : Set ms_down_timer to 3 * advert_int + TIMER_SKEW when leaving
MASTER state.
* VRRP : In MASTER state, when incoming advert match or FAULT state is
requested then force leaving MASTER state transition. (review the
previous election approach).
* VRRP : Optimized the leave FAULT state transition. Directly
coded into
the FSM for speed up recovery or code readability.
* VRRP : Extended smtp notifier for BACKUP state. Review the
MASTER state
notification to only notify when VIPs are set.
* some cosmetics patches.
* Adam Fletcher, <adamf@xxxxxxxxx> created the 'Keepalived+LVS NAT
HOWTO'
Any comments are welcome.
Best regards,
Alexandre
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