运维经验分享作为一个专题，目前共7篇文章
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最近开发人员提出新的需求，想将ChatterServer服务控制脚本放到ChatterServer根目录下的bin目录下，并向一次性可以部署多个实例，因此这一个需求引发了多个改变：
1.不再使用service进行控制，仍然保留status、start、stop和restart功能
2.BASEDIR不再使用绝对路径而要使用相对路径，例如BASEDIR=..
3.SERVICEPORT要从ChatterServer根目录下的conf目录中的文件中读取
4.日志目录logs将不再手动创建，控制脚本需要自己创建logs目录
针对以上4点变更，改进如下
1.去掉service控制，只需要将此脚本放到ChatterServer根目录下的bin目录下执行（实际上更简单了）
2.既然要使用相对路径而不使用绝对路径就要正确设置Shell脚本的当前工作目录，否则非但脚本不好用（log和pid都无法正常生成），还会导致ChatterServer的核心命令行无法使用（无法读取到相对路径下的配置文件）
3.要想SERVICEPORT从ChatterServer根目录下的conf目录中的文件中读取，非常简单，但疑难问题在于排查上，例如grep对dos文件格式（file format）的文件非常不友好，会对脚本中后面的命令产生巨大影响（特别是echo以及变量（以$开头的字符串）几乎会乱掉），因此在使用grep前，必须将此文件的内容通过dos2unix命令来转化，除非开发人员乐意将文件格式从dos手动改为unix（可以参考《UNIX/Linux环境编程必须需要注意的问题总结》）
4.相当于多了一层异常检测而已，比较简单，看新的ChatterServer服务控制脚本就会明白。
经过二次“优化”改造的脚本如下：
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#!/bin/bash
#chkconfig: 345 86 14
#description: Startup and shutdown script for ChatterServer(Port:$SERVICEPORT))
VERSION=1.0.0-snapshot
BASEDIR=..
# choose LOGDIR as standard of work directory
LOGDIR=$(
pwd
)/$BASEDIR
/logs
if
[[ ! -d $LOGDIR ]];
then
mkdir
$LOGDIR
fi
#SERVICEPORT=29093
#SERVICEPORT=`grep ^port $(pwd)/../conf/constant.properties | awk -F '=' '{print $2}'`
# NOTE: $(pwd)/../conf/constant.properties file fileformat must be unix NOT dos in shell scripts, or will cause some unknown error
# NOTE: grep is vrey sensitive to dos fileformat or unix fileformat
# apt-get install dos2unix
PORTFILE=$(
pwd
)/..
/conf/constant
.properties
SERVICEPORT=$(
cat
$PORTFILE | dos2unix |
grep
^port |
awk
-F
'='
'{print $2}'
)
PIDFILE=$LOGDIR
/chatter
.pid
SERVER=$(
pwd
)/$BASEDIR
/chatter-
$VERSION\.jar
BASENAME=chatter
ARGS=
"-Xms2g -Xmx4g -Xmn4g -Xss128k -XX:MaxPermSize=64m -XX:-UseParallelGC -XX:+UseParallelOldGC -XX:ParallelGCThreads=4 -XX:+UseConcMarkSweepGC -XX:MaxTenuringThreshold=30 -XX:SurvivorRatio=6"
# -Xms2g -Xmx2g -Xmn2g -Xss128k -XX:MaxPermSize=64m -XX:-UseParallelGC -XX:+UseParallelOldGC -XX:ParallelGCThreads=4 -XX:+UseConcMarkSweepGC -XX:MaxTenuringThreshold=30 -XX:SurvivorRatio=6
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
$pid |
grep
-
v
grep
) ]];
then
echo
"SUCCESS: ChatterServer(Port:$SERVICEPORT) is OK"
exit
0
else
echo
"ERROR: ChatterServer(Port:$SERVICEPORT) pid is NOT exist"
exit
1
fi
elif
[[ ! $(
netstat
-anop 2>
/dev/null
|
grep
$SERVICEPORT |
grep
LISTEN) ]];
then
echo
"ERROR: ChatterServer(Port:$SERVICEPORT) port is NOT listen"
exit
1
elif
[[ ! -f $PIDFILE ]];
then
echo
"ERROR: ChatterServer(Port:$SERVICEPORT) pid file is NOT exist"
exit
1
else
echo
"ERROR: ChatterServer(Port:$SERVICEPORT) is NOT running"
exit
1
fi
}
start() {
if
[[ -e $PIDFILE ]];
then
echo
"ERROR: pidfile $PIDFILE exist, ChatterServer(Port:$SERVICEPORT) has started with pid $(cat $PIDFILE)"
# pid file can be deleted
/bin/rm
-f $PIDFILE
exit
1
fi
if
[[ -e $SERVER ]];
then
echo
"INFO: Starting ChatterServer(Port:$SERVICEPORT)"
# 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
$LOGDIR/../
#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
$LOGDIR/..
/bin
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 $2}')
pid=$(
netstat
-anop 2>
/dev/null
|
grep
$SERVICEPORT |
grep
LISTEN |
awk
'{print $7}'
|
awk
-F
'/'
'{print $1}'
)
# 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 $PIDFILE ]];
then
echo
"SUCCESS: ChatterServer(Port:$SERVICEPORT) start OK"
# Setting up start log
echo
"[ $(date +"
%D %T
") ] SUCCESS: ChatterServer(Port:$SERVICEPORT) 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(Port:$SERVICEPORT) start failed"
# Setting up start log
echo
"[ $(date +"
%D %T
") ] ERROR: ChatterServer(Port:$SERVICEPORT) 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-
$(
date
+
"%Y%m%d"
).out &&
sleep
1
then
echo
"SUCCESS: ChatterServer(Port:$SERVICEPORT) stop OK with TERM"
# Setting up stop log
echo
"[ $(date +"
%D %T
") ] SUCCESS: ChatterServer(Port:$SERVICEPORT) 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 $pid >
/dev/null
2>&1 &&
sleep
1
then
echo
"SUCCESS: ChatterServer(Port:$SERVICEPORT) stop OK with KILL"
# Setting up stop log
echo
"[ $(date +"
%D %T
") ] SUCCESS: ChatterServer(Port:$SERVICEPORT) stop OK with KILL "
>>$LOGDIR
/service
.log
# Because we can NOT use usleep , so we must comment out sleep 1 next
#sleep 1
else
echo
"ERROR: ChatterServer(Port:$SERVICEPORT) stop faild"
# Setting up stop log
echo
"[ $(date +"
%D %T
") ] ERROR: ChatterServer(Port:$SERVICEPORT) stop failed "
>>$LOGDIR
/service
.log
exit
1
fi
# Remove pid file
if
[[ -f $PIDFILE ]];
then
/bin/rm
-f $PIDFILE
fi
else
echo
"ERROR: No ChatterServer(Port:$SERVICEPORT) running"
# TODO We just think this is not essential
# Do NOT setting up log here
exit
1
fi
}
restart() {
echo
"INFO: Restarting ChatterServer(Port:$SERVICEPORT)"
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"
exit
1
;;
esac
# replace "exit 0" with ":"
#exit 0
:
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--end--
====================================分割线======================================
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/dgd2010/1674188，如需转载请自行联系原作者
