运维经验分享作为一个专题，目前共7篇文章
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本脚本是ChatterServer的服务控制脚本，即能通过service命令来控制ChatterServer的启动、停止、重新启动以及状态查看，就像mysql有/etc/init.d/mysql或/etc/init.d/mysqld一样，只是这个ChatterServer的服务控制脚本写起来更加困难，有些信息的捕获和判断更加复杂，原因还是主要与ChatterServer的运行方式和启动过程中发生的一些事情有关，这个在脚本的注释中已经充分的标注清楚了。
由于ChatterServer运行在Ubuntu上，因此跟CentOS还是有很大的差异，例如sleep 1和usleep 100000上，CentOS能控制更精确的延时，而Ubuntu不能支持usleep因此不能控制更精确的延时，导致潜在的性能问题。
为方便阅读，在此简单举几个问题例子：
1.ChatterServer的java核心命令行执行后，可能是由于程序或者性能原因，会延迟建立端口连接；
2.ChatterServer的jar包里面用到了一些配置文件，在特定的目录下，必须先进入这些目录才能执行java核心命令行；
问题解决办法：
针对第一个问题，采用多重判断和延时执行的方法；
针对第二个问题，调试时带来问题较多，后来才与开发沟通，弄明白其原因；
此脚本还根据开发的需求，将ChatterServer日志按照日期保存以便于在服务状态发生改变时不会新的日志覆盖，将脚本运行日志保存到新的日志，共管理查看。
以下是脚本第四版内容：
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#!/bin/bash
#chkconfig: 345 86 14
#description: Startup and shutdown script for ChatterServer
VERSION=1.0.0-snapshot
BASEDIR=
/data/chatterserver
LOGDIR=$BASEDIR
/logs
SERVICEPORT=29092
PIDFILE=$BASEDIR
/pid/chatter
.pid
SERVER=$BASEDIR
/chatter-
$VERSION\.jar
BASENAME=chatter
# -Xms2g -Xmx2g -Xmn2g -Xss128k -XX:MaxPermSize=64m -XX:-UseParallelGC -XX:+UseParallelOldGC -XX:ParallelGCThreads=4 -XX:+UseConcMarkSweepGC -XX:MaxTenuringThreshold=30 -XX:SurvivorRatio=6
ARGS=
""
status() {
# The judgment priority: pid > port > piffile
# netstat run by common user will get some error output, so we put those error outout to /dev/null
if
[[ $(
netstat
-anop 2>
/dev/null
|
grep
$SERVICEPORT |
grep
LISTEN) || -f $PIDFILE ]];
then
#pid=$(cat $PIDFILE)
pid=$(
ps
-ef |
grep
java |
grep
$BASENAME |
grep
-
v
grep
|
awk
'{print $2}'
)
if
[[ $pid !=
""
&& $(
ps
-ef |
grep
$pid |
grep
-
v
grep
) ]];
then
echo
"SUCCESS: ChatterServer is OK"
exit
0
else
echo
"ERROR: ChatterServer pid is NOT exist"
exit
1
fi
elif
[[ ! $(
netstat
-anop 2>
/dev/null
|
grep
$SERVICEPORT |
grep
LISTEN) ]];
then
echo
"ERROR: ChatterServer port is NOT listen"
exit
1
elif
[[ ! -f $PIDFILE ]];
then
echo
"ERROR: ChatterServer pid file is NOT exist"
exit
1
else
echo
"ERROR: ChatterServer is NOT running"
exit
1
fi
}
start() {
if
[[ -e $PIDFILE ]];
then
echo
"ERROR: pidfile $PIDFILE exist, server has started with pid $(cat $PIDFILE)"
# pid file can be deleted
/bin/rm
-f $PIDFILE
exit
1
fi
if
[[ -e $SERVER ]];
then
echo
"INFO: Starting ChatterServer"
# Start ChatterServer core daemon
# Why using "date +"%Y%m%d""? Because we just need restart this once per day
# For ChatterServer wiil find some file in $BASEDIR
cd
$BASEDIR
#nohup java -jar $SERVER $ARGS >>$LOGDIR/console-$(date +"%Y%m%d").out 2>&1 &
java -jar $SERVER $ARGS >>$LOGDIR
/console-
$(
date
+
"%Y%m%d"
).out 2>&1 &
#java -jar $SERVER $ARGS >$LOGDIR/console.out 2>&1 &
RETVAL=$?
# shell do NOT need home directory
## For ChatterServer wiil find some file in $BASEDIR
#cd
if
[[ $RETVAL -
eq
0 ]];
then
## $! --> Expands to the process ID of the most recently executed background (asynchronous) command.
#echo $! > $PIDFILE
# For java performance issue, port 29092 will listen latter, we will waiting for 2 second
sleep
2
# get pid var
# TODO remove debug info
#echo "DEBUG: "
#ps -ef | grep $BASENAME | grep -v grep | awk '{print $2}'
# end debug
pid=$(
ps
-ef |
grep
java |
grep
$BASENAME |
grep
-
v
grep
|
awk
'{print $2}'
)
# send pid number to pid file
echo
$pid > $PIDFILE
# Those lines will remove in next release
# TODO remove debug info
#echo "DEBUG: live 1"
# For java performance issue, port 29092 will listen latter, so we change judgment conditions
if
[[ $(
netstat
-anop 2>
/dev/null
|
grep
$SERVICEPORT |
grep
LISTEN) || -f $PIDFILE ]];
then
echo
"SUCCESS: ChatterServer start OK"
# Setting up start log
echo
"[ $(date +"
%D %T
") ] SUCCESS: ChatterServer started with pid $(cat $PIDFILE) "
>>$LOGDIR
/service
.log
fi
# TODO remove debug info
#echo "DEBUG: live 2"
# -Those lines will remove in next release
#echo "SUCCESS: ChatterServer start OK"
## Setting up start log
#echo "[ $(date +"%D %T") ] SUCCESS: ChatterServer started with pid $(cat $PIDFILE) " >>$LOGDIR/service.log
else
echo
"ERROR: ChatterServer start failed"
# Setting up start log
echo
"[ $(date +"
%D %T
") ] ERROR: ChatterServer start failed "
>>$LOGDIR
/service
.log
exit
$RETVAL
fi
else
echo
"ERROR: Couldn't find $SERVER"
# TODO We just think this is not essential
# Do NOT setting up log here
exit
1
fi
}
stop() {
if
[[ -e $PIDFILE ]];
then
pid=$(
cat
$PIDFILE)
#if kill -TERM $PIDFILE >/dev/null 2>&1
# TODO remove debug info
#echo "DEBUG: $LOGDIR/console-$(date +"%Y%m%d").out"
# Ubuntu can NOT use "usleep", so use "sleep" instead
# usleep 100000
if
kill
-TERM $pid >>$LOGDIR
/console-
$(
date
+
"%Y%m%d"
).out &&
sleep
1
then
echo
"SUCCESS: ChatterServer stop OK with TERM"
# Setting up stop log
echo
"[ $(date +"
%D %T
") ] SUCCESS: ChatterServer stop OK with TERM "
>>$LOGDIR
/service
.log
# Because we can NOT use usleep , so we must comment out sleep 1 next
#sleep 1
# Ubuntu can NOT use "usleep", so use "sleep" instead
# usleep 100000
elif
kill
-KILL $pid >
/dev/null
2>&1 &&
sleep
1
then
echo
"SUCCESS: ChatterServer stop OK with KILL"
# Setting up stop log
echo
"[ $(date +"
%D %T
") ] SUCCESS: ChatterServer stop OK with KILL "
>>$LOGDIR
/service
.log
# Because we can NOT use usleep , so we must comment out sleep 1 next
#sleep 1
else
echo
"ERROR: ChatterServer stop faild"
# Setting up stop log
echo
"[ $(date +"
%D %T
") ] ERROR: ChatterServer stop failed "
>>$LOGDIR
/service
.log
exit
1
fi
# Remove pid file
if
[[ -f $PIDFILE ]];
then
/bin/rm
-f $PIDFILE
fi
else
echo
"ERROR: No ChatterServer running"
# TODO We just think this is not essential
# Do NOT setting up log here
exit
1
fi
}
restart() {
echo
"INFO: Restarting ChatterServer"
stop
# Those lines will remove in next release
if
[[ $(
netstat
-anop 2>
/dev/null
|
grep
$SERVICEPORT |
grep
LISTEN) ]];
then
echo
"WARNNING: port $SERVICEPORT is in using, must waiting"
sleep
5
if
[[ $(
netstat
-anop 2>
/dev/null
|
grep
$SERVICEPORT |
grep
LISTEN) ]];
then
echo
"WARNNING : port $SERVICEPORT is still in using, must waiting"
sleep
2
fi
fi
# -Those lines will remove in next release
# Do NOT using sleep any seconds here with stop() function used
start
}
case
$1
in
status)
status
;;
start)
start
;;
stop)
stop
;;
restart)
restart
;;
help|*)
echo
"Usage: $0 {status|start|stop|restart|help} with $0 itself"
echo
"Usage: service chatter {status|start|stop|restart|help} with service"
exit
1
;;
esac
# replace "exit 0" with ":"
#exit 0
:
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--end--
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运维经验分享作为一个专题，目前共7篇文章
本文转自 urey_pp 51CTO博客，原文链接：http://blog.51cto.com/dgd2010/1673822，如需转载请自行联系原作者
