如何使用心脏使应用程序保持活力？
假设我有一个应用程序X，如果我只是调用类似的话，它是否会被监控：
erl -boot X -heart -env HEART_BEAT_TIMEOUT 30 -detached
答案 0 :(得分：4)
是的，这将自动启动监控节点的心脏进程。请参阅the heart documentation。
更新：是的，渐近线是正确的。您还需要一个HEART_COMMAND环境变量来指示重新启动节点时要做的事情。
答案 1 :(得分：2)
http://www.erlang.org/doc/man/heart.html
This modules contains the interface to the heart process. heart
sends periodic heartbeats to an external port program, which is
also named `heart`. The purpose of the heart port program is to
check that the Erlang runtime system it is supervising is still
running. If the port program has not received any heartbeats within
`HEART_BEAT_TIMEOUT` seconds (default is 60 seconds), the system
can be rebooted. Also, if the system is equipped with a hardware
watchdog timer and is running Solaris, the watchdog can be used to
supervise the entire system.
<snip>
If the system should be rebooted because of missing heart-beats, or
a terminated Erlang runtime system, the environment variable
HEART_COMMAND has to be set before the system is started. If this
variable is not set, a warning text will be printed but the system
will not reboot.
现在我有一个Makefile，其中包含一条语句，可以为我运行erl -heart ...。当我执行它时，这是进程列表：
ubuntu 3814 3579 3814 3579 0 22:03 pts/0 00:00:00 make webstart
ubuntu 3829 3814 3814 3579 25 22:03 pts/0 00:00:01 /usr/local/lib/erlang/erts-5.8.3/bin/beam.smp -K true -A 5
ubuntu 3848 3829 3848 3848 0 22:03 ? 00:00:00 heart -pid 3829
当我终止PID 3829时，Erlang shell中会出现以下输出：
heart: Wed May 18 22:04:09 2011: Erlang has closed.
heart: Wed May 18 22:04:09 2011: Would reboot. Terminating.
make: *** [webstart] Terminated
很明显，我需要将HEART_COMMAND设置为某种重启语句，然后heart将根据需要执行。 AFAIK，鉴于文档中的描述，心脏并不打算在崩溃时简单地重启Erlang VM;这听起来像Erlang主管应该为你做的事情，但我可能错了。
（当然，你可以只使用HEART_COMMAND来重启你的Erlang程序。）