shell脚本规划化模板
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shell脚本规划化模板
Linux运维过程中,shell脚本是不可缺少的工具,但是每个运维人员编程的习惯都不一样,很多时候就是实现某个功能,写出来的脚本都是烂七八糟的。
脚本必须规范化,应该从以后几个方面着手:
1、脚本必须记录日志,尽可能多的把执行命令操作写入日志当中,有便于日后可以追踪;
2、脚本尽可能实现函数化模块化,函数名具有可读性;
3、脚本必须要有传入参数;
4、脚本执行必须是单进程的,即该脚本某个时间段只能运行一次;
5、脚本执行过程中必须加锁机制;
6、脚本注释是不可缺少的;
7、脚本最好统一入口(main函数),个人喜好;
大致分为这7点,运维必须规范化流程化,不做流氓运维,对自己工作负责,也便于其他同事方便查看或接手,我个人不推崇脚本复杂化,搞一堆大家看不懂的。
举例说明,上线是运维不可缺少的工作,本人测试实现一个很简单的功能:
1、jboss容器发布java代码(不考虑配置文件更新)
1)关闭服务;
2)拷贝代码至指定目录;
3)启动服务;
2、服务器上面开好几个jboss实例(按业务模块化),自动识别出每个容器(目录:/data/)
3、根据模块化发布版本,每次只更新一个业务模块版本
#!/bin/bash
#######################################################
# $Name: release.sh
# $Version: v1.0
# $Function: release for jboss Script
# $Author: Verrion Jian
# $Create Date: 2016-09-22
# $Description: Sub module to release for firm
#######################################################
# 定义脚本环境变量
SHELL_NAME="release.sh"
SHELL_DIR="/data/scripts"
SHELL_LOG="${SHELL_DIR}/${SHELL_NAME}.log"
LOCK_FILE="/tmp/${SHELL_NAME}.lock"
PACKAGE_DIR="/data/code"
# 记录日志
log_output(){
LOG_INFO=$1
echo "$(date "+%Y-%m-%d") $(date "+%H-%M-%S") : ${SHELL_NAME} : ${LOG_INFO}" >> ${SHELL_LOG}
}
# 脚本用法,自动化列出服务器上面存在的所有实例
usage(){
get_modules
str=`echo ${module_array[@]} |sed s/[[:space:]]/‘|‘/g`
echo $"Usage: $0 [$str]" && exit
}
# 添加锁文件
lock(){
touch ${LOCK_FILE}
}
# 删除锁文件
unlock(){
rm -f ${LOCK_FILE}
}
# 判断代码临时目录和文件是否存在
is_package_exist(){
if [ ! -d $PACKAGE_DIR ];then
log_output "The script exec as insufficient --> The release directory is non-existent"
echo "The release directory is non-existent" && exit
fi
package_num=`ls $PACKAGE_DIR |wc -l`
if [ $package_num -eq 0 ];then
log_output "The script exec as insufficient --> The packages for release is empty"
echo "The packages for release is empty,please check directory:"$PACKAGE_DIR" and upload packages" && exit
fi
}
# 列出服务器上面jboss容器个数
get_container(){
container_name=`ls -l /data/ |grep jboss | awk ‘{print $9}‘|xargs`
}
# 列出实例模块信息,进程号等(如:test_login.war为java代码包)
get_modules(){
get_container
for i in $container_name
do
war_num=`ls /data/$i/server/default/deploy/test*war | wc -l`
if [ $war_num -ne 1 ];then
log_output "The container deploy to not standard--> Num of the war_package can only one"
echo "The container deploy to not standard--> Num of the war_package can only one" && exit
else
war_name=`ls /data/$i/server/default/deploy/test*war | cut -d / -f7 | cut -d - -f1`
pid=`ps -ef |grep $i |grep -v grep |awk ‘{print $2}‘`
module_name=$war_name" "$module_name
pids=$pid" "$pids
jboss_name=$i" "$jboss_name
fi
done
module_array=($module_name)
pid_array=($pids)
jboss_array=($jboss_name)
}
# 模块化发布上线
release_module(){
# ensure a process is running at best
if [ -f "$LOCK_FILE" ];then
log_output "${SHELL_NAME} is running"
echo "${SHELL_NAME}" is running && exit
fi
# ensure the package exist
is_package_exist
# denfie varchar
packagename=$1
packagenum=$2
packagenum=`expr $packagenum - 1`
target_pid=${pid_array[$packagenum]}
target_jboss=${jboss_array[$packagenum]}
target_dir="/data/$target_jboss/server/default/deploy"
package_str=`ls $PACKAGE_DIR`
log_output "release module for platform system start"
lock
if [[ $package_str =~ $packagename ]];then
#kill -9 $target_pid
echo "kill -9 $target_pid"
log_output "kill -9 $target_pid"
#echo $target_pid
sleep 3
#rm -rf $target_dir/$packagename*
echo "rm -rf $target_dir/$packagename*"
log_output "rm -rf $target_dir/$packagename*"
#ls $target_dir/$packagename*
#cp -r $PACKAGE_DIR/$packagename* $target_dir
echo "cp -r $PACKAGE_DIR/$packagename* $target_dir"
log_output "cp -r $PACKAGE_DIR/$packagename* $target_dir"
#ls $PACKAGE_DIR/$packagename*
else
log_output "The package of publish directory is not found"
echo "The package of publish directory is not found" && exit
fi
log_output "release module for platform system stop"
unlock
}
# Main函数入口
main(){
tag=0
if [ -z $1 ];then
usage
fi
get_modules
for i in $module_name
do
let count+=1
if [ $i = $1 ];then
pkgname=$1
pkgnum=$count
release_module "$pkgname" "$pkgnum"
tag=1
break
fi
done
if [ $tag -eq 0 ];then
module_name=""
usage
fi
}
# 执行脚本
main $1
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