启动应用程序

该方法使用进程管理器工具 (pmfadm) 来启动应用程序。使用 pmfadm 命令，可以设置在指定时间范围内尝试重新启动应用程序的次数。RTR 文件包含两种属性：Retry_count 指定尝试重新启动应用程序的次数，Retry_interval 指定执行此操作的时间间隔。

Start 方法使用 scha_resource_get() 函数检索 Retry_count 和 Retry_interval 的值，并将其值存储于 shell 变量中。Start 方法使用 -n 和 -t 选项将这些值传递给 pmfadm。

# Get the value for retry count from the RTR file.
RETRY_CNT=`scha_resource_get -O Retry_count -R $RESOURCE_NAME \
-G $RESOURCEGROUP_NAME`
# Get the value for retry interval from the RTR file. This value is in seconds
# and must be converted to minutes for passing to pmfadm. Note that the 
# conversion rounds up; for example, 50 seconds rounds up to 1 minute.
((RETRY_INTRVAL=`scha_resource_get -O Retry_interval -R $RESOURCE_NAME \
-G $RESOURCEGROUP_NAME` / 60))

# Start the in.named daemon under the control of PMF. Let it crash and restart
# up to $RETRY_COUNT times in a period of $RETRY_INTERVAL; if it crashes
# more often than that, PMF will cease trying to restart it.
# If there is a process already registered under the tag
# <$PMF_TAG>, then PMF sends out an alert message that the
# process is already running.
pmfadm -c $PMF_TAAG -n $RETRY_CNT -t $RETRY_INTRVAL \
    /usr/sbin/in.named -c named.conf

# Log a message indicating that HA-DNS has been started.
if [ $? -eq 0 ]; then
   logger -p ${SYSLOG_FACILITY}.err \
         -t [$SYSLOG_TAG] \
         "${ARGV0} HA-DNS successfully started"
fi
exit 0