keepalived-1.1.13

keepalived-1.1.13

* keepalived-1.1.13 released.
* VRRP : Added a new notify script to be launch during vrrp
  instances shutdown. This new notify hook is configured
  using notify_stop keyword inside vrrp_instance block.
* VRRP : Willy Tarreau <w at 1wt.eu> fixed an errno issue in
  thread_fetch(), errno is lost during set_time_now(). This
  patch saves it across the call to set_time_now() in order
  to get the valid error.
* VRRP : Willy Tarreau <w at 1wt.eu> extended timer framework
  to save errno in timer_now() and set_time_now() just in
  case other functions do not expect these functions to modify
  it. This is a safer approach than the initial patch to
  thread_fetch(), while still compatible.
* VRRP : Willy Tarreau <w at 1wt.eu> fixed an FSM silent issue.
  By default, the VRRP daemon stops sending during new MASTER
  elections. This causes 3 to 4 seconds of silence depending on
  the local priority, and sometimes causes flapping when the
  differences in priorities are very low, due to the kernel timer's
  resolution : sometimes, the old master receives a first
  advertisement, enters backup, waits 3 seconds, sees nothing and
  finally becomes master again, which forces a new reelection on
  the other one.
* VRRP : Willy Tarreau <w at 1wt.eu> extended VRRP framework to
  support floating priority. Replace the priority in each
  vrrp_instance with a base priority and an effective priority,
  to prepare the support for floating priorities. The configuration
  sets the base_priority, and all comparisons use the new
  effective_priority value. This one is computed in the
  vrrp_update_priority() thread by adding an offset to base_priority,
  based on the result of various checks.
* VRRP : Willy Tarreau <w at 1wt.eu> extended notify script to add
  the priority in "$4" when calling a notify script. This is
  important in labs and datacenters when systems can display the
  priority on a front LCD, because it allows workers to carefully
  operate without causing unexpected reelections.
* VRRP : Willy Tarreau <w at 1wt.eu> extended interface tracking
  framework to let interface tracking change the priority by adding
  a "weight" parameter. If the weight is positive, it will be added
  to the priority when the interface is UP. If the weight is negative,
  it will be subtracted from the priority when the interface is down.
  If the weight is zero (default), a down interface will switch the
  instance to the FAULT state.
* VRRP : Willy Tarreau <w at 1wt.eu> added a new "vrrp_script" section
  to monitor local processes or do any type of local processing to
  decide whether the machine is in good enough health to be elected
  as master. A same script will be run once for all instances which
  monitor it. If no instance use it, it will not be run, so that it's
  safe to declare a lot of useful scripts. A weight is associated to
  the script result. If the weight is positive, it will be added to
  the priority when the result is OK (exit 0). If the weight is
  negative, it will be subtracted from the priority when the result
  is KO (exit != 0). If the weight is zero, the script will not be
  monitored. The default value is 2.
* VRRP : Willy Tarreau <w at 1wt.eu> extended vrrp scheduler so that
  when a VRRP is part of a SYNC group, it must not use floating
  priorities, otherwise this may lead to infinite re-election after
  every advertisement because some VRRPs will announce higher prios
  than the peer, while others will announce lower prios. The solution
  is to set all weights to 0 to enable standard interface tracking,
  and to disable the update prio thread if VRRP SYNC is enabled on a
  VRRP.
* VRRP : Willy Tarreau <w at 1wt.eu> added some documentation and
  examples for the brand new VRRP tracking mechanisms.
* VRRP : Ranko Zivojnovic, <ranko at spidernet.net> fixed vrrp
  scheduler to execute notify* scripts in transition from the
  failed state to the backup state.
* Nick Couchman, <nick.couchman at seakr.com>, added support for
  real server upper and lower thresholds.  This allows you to set
  a minimum and maximum number of connections to each real server
  using the "uthreshold" (maximum) and "lthreshold" (minimum)
  options in the real_server section of the configuration file.
* Chris Caputo, <ccaputo at alt.net> extended autoconf script
  to support recent move of UTS_RELEASE from linux/version.h to
  linux/utsrelease.h.
* Chris Caputo, <ccaputo at alt.net> extended ipvswrapper 2.4
  code to support misc_dynamic weight.