keepalived-0.7.1

keepalived-0.7.1

* 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@rovia.com> created the 'Keepalived+LVS NAT HOWTO'