Stop 方法提供了用来停止数据服务的双重方法:顺序或平稳方法通过 pmfadm 使用 SIGTERM 信号,突然或强硬方法使用 SIGKILL 信号。Stop 方法获取 Stop_timeout 值(时间量,Stop 方法必须在该期间返回)。Stop 将此时间的 80% 分配给平稳停止,15% 分配给突然停止(5% 保留),如以下样例代码所示。
STOP_TIMEOUT='scha_resource_get -O STOP_TIMEOUT -R $RESOURCE_NAME \ -G $RESOURCEGROUP_NAME' ((SMOOTH_TIMEOUT=$STOP_TIMEOUT * 80/100)) ((HARD_TIMEOUT=$STOP_TIMEOUT * 15/100))
Stop 方法将使用 pmfadm -q 检验 DNS 守护进程是否正在运行。如果 DNS 守护进程正在运行,Stop 首先使用 pmfadm -s 发送 TERM 信号终止 DNS 进程。如果经过超时值的 80% 后该信号还无法终止进程,Stop 将发送 SIGKILL 信号。如果该信号在超时值的 15% 范围内仍无法终止进程,方法将记录一条错误消息并以出错状态退出。
如果 pmfadm 终止了该进程,该方法将记录一条说明该进程已停止并在成功状态下退出的消息。
如果 DNS 进程未运行,该方法将记录一条说明该进程未运行并仍在成功状态下退出的消息。以下样例代码说明了 Stop 如何使用 pmfadm 停止 DNS 进程。
# See if in.named is running, and if so, kill it. if pmfadm -q $PMF_TAG; then # Send a SIGTERM signal to the data service and wait for 80% of the # total timeout value. pmfadm -s $RESOURCE_NAME.named -w $SMOOTH_TIMEOUT TERM if [ $? -ne 0 ]; then logger -p ${SYSLOG_FACILITY}.err \ -t [$RESOURCETYPE_NAME,$RESOURCEGROUP_NAME,$RESOURCE_NAME] \ “${ARGV0} Failed to stop HA-DNS with SIGTERM; Retry with \ SIGKILL” # Since the data service did not stop with a SIGTERM signal, use # SIGKILL now and wait for another 15% of the total timeout value. pmfadm -s $PMF_TAG -w $HARD_TIMEOUT KILL if [ $? -ne 0 ]; then logger -p ${SYSLOG_FACILITY}.err \ -t [$SYSLOG_TAG] \ “${ARGV0} Failed to stop HA-DNS; Exiting UNSUCCESSFUL” exit 1 fi fi else # The data service is not running as of now. Log a message and # exit success. logger -p ${SYSLOG_FACILITY}.err \ -t [$SYSLOG_TAG] \ “HA-DNS is not started” # Even if HA-DNS is not running, exit success to avoid putting # the data service resource in STOP_FAILED State. exit 0 fi # Could successfully stop DNS. Log a message and exit success. logger -p ${SYSLOG_FACILITY}.err \ -t [$RESOURCETYPE_NAME,$RESOURCEGROUP_NAME,$RESOURCE_NAME] \ “HA-DNS successfully stopped” exit 0 |