HA-Tools 介绍
HA-Tools
提供了一些用以提高shell脚本在高可用性环境下执行的程序，特别是halockrun命令提供简单可靠的方法来实现锁定在shell脚本（一个halockrun典型用法是防止cronjobs运行共存的），以及hatimerun程序提供了一个退出机制的时间。
The HA-Tools provide some programs to improve shell scripting, especially in a
High Availability environment. The halockrun program provides a simple and
reliable way to implement locking in shell scripts (a typical usage for
halockrun is to prevent cronjobs to run simultanously), and the hatimerun
program provides a time-out mechanism.