标签：自动化部署脚本 shell部署脚本 capistrano的shell脚本实现 脚本实现自动更新和回滚 自动化部署shell脚本实例
前文讲述了《通过Git WebHooks+脚本实现自动更新发布代码》，里面提供了一种自动更新发布代码的脚本编写思路。本文的脚本与前文中的思路不太不同。本脚本以capistrano中的一些思想和理念为依据，用简单好理解的shell脚本实现capistrano原本实现的自动化部署部分。
脚本的一些特点和功能：
解决脚本的符号链接问题，准确获取脚本工作目录（从tomcat脚本中学到）；
颜色显示，不同级别的信息用不同的颜色显示（共两种方案，前一种从一位不知名的国外工程师处得到，后一种从lnmp1.2脚本中得到）；
生成capistrano目录结构；
清除过期目录和文件；
检查部署要求是否满足，如磁盘空间的需求等，其他的要求检查有待于添加；
部署失败后归滚；
项目废弃后删除项目；
脚本里面尽可能的考虑容错（异常判断）和部分细节；
脚本存在的已知的问题：
（1）脚本中有几个TODO，有待于改善；
（2）repository目录暂时没有用到；
（3）获取git的版本号问题；
（4）部署后生成的日志有待于优化；
（5）脚本基本使用英文（Chinglish）作为注释，部分注释可能不全；
（6）可能存在的其他问题；
为了后期的改进和部分需求变更，也为了便于获取该脚本，此脚本可以从github上获取，欢迎和接受提交任何bug、issue以及任何improvement。
github地址是：
https://github.com/DingGuodong/BashShellHeader/blob/master/example-deploy.sh
脚本内容如下：
#!/bin/bash
# Public header
# =============================================================================================================================
# resolve links - $0 may be a symbolic link
PRG="$0"
while [ -h "$PRG" ]; do
ls=`ls -ld "$PRG"`
link=`expr "$ls" : ‘.*-> \(.*\)$‘`
if expr "$link" : ‘/.*‘ > /dev/null; then
PRG="$link"
else
PRG=`dirname "$PRG"`/"$link"
fi
done
# Get standard environment variables
PRGDIR=`dirname "$PRG"`
# echo color function
function cecho {
# Usage:
# cecho -red sometext #Error, Failed
# cecho -green sometext # Success
# cecho -yellow sometext # Warnning
# cecho -blue sometext # Debug
# cecho -white sometext # info
# cecho -n # new line
# end
while [ "$1" ]; do
case "$1" in
-normal) color="\033[00m" ;;
# -black) color="\033[30;01m" ;;
-red) color="\033[31;01m" ;;
-green) color="\033[32;01m" ;;
-yellow) color="\033[33;01m" ;;
-blue) color="\033[34;01m" ;;
# -magenta) color="\033[35;01m" ;;
# -cyan) color="\033[36;01m" ;;
-white) color="\033[37;01m" ;;
-n) one_line=1; shift ; continue ;;
*) echo -n "$1"; shift ; continue ;;
esac
shift
echo -en "$color"
echo -en "$1"
echo -en "\033[00m"
shift
done
if [ ! $one_line ]; then
echo
fi
}
# end echo color function
# echo color function, smarter
function echo_r () {
#Error, Failed
[ $# -ne 1 ] && return 0
echo -e "\033[31m$1\033[0m"
}
function echo_g () {
# Success
[ $# -ne 1 ] && return 0
echo -e "\033[32m$1\033[0m"
}
function echo_y () {
# Warnning
[ $# -ne 1 ] && return 0
echo -e "\033[33m$1\033[0m"
}
function echo_b () { # Debug
[ $# -ne 1 ] && return 0
echo -e "\033[34m$1\033[0m"
}
# end echo color function, smarter
WORKDIR=$PRGDIR
# end public header
# =============================================================================================================================
# Where to get source code
SOURCEURL=https://github.com/DingGuodong/GitOSCAutoDeploy.git
# Setting how many days do you want save old releases, default is 10 days
save_old_releases_for_days=10
function setDirectoryStructure() {
if [ -f $WORKDIR/.lock ];then
echo_g "Set directory structure has been done, skipping. "
return
fi
echo_b "Setting directory structure."
# learn from capistrano
# Refer: http://capistranorb.com/documentation/getting-started/structure/
# Refer: http://capistranorb.com/documentation/getting-started/structure/#
# ├── current -> /var/www/my_app_name/releases/20150120114500/
# ├── releases
# │ ├── 20150080072500
# │ ├── 20150090083000
# │ ├── 20150100093500
# │ ├── 20150110104000
# │ └── 20150120114500
# ├── repo
# │ └── <VCS related data>
# ├── revisions.log
# └── shared
# └── <linked_files and linked_dirs>
# current is a symlink pointing to the latest release. This symlink is updated at the end of a successful deployment. If the deployment fails in any step the current symlink still points to the old release.
# releases holds all deployments in a timestamped folder. These folders are the target of the current symlink.
# repo holds the version control system configured. In case of a git repository the content will be a raw git repository (e.g. objects, refs, etc.).
# revisions.log is used to log every deploy or rollback. Each entry is timestamped and the executing user (username from local machine) is listed. Depending on your VCS data like branchnames or revision numbers are listed as well.
# shared contains the linked_files and linked_dirs which are symlinked into each release. This data persists across deployments and releases. It should be used for things like database configuration files and static and persistent user storage handed over from one release to the next.
# The application is completely contained within the path of :deploy_to. If you plan on deploying multiple applications to the same server, simply choose a different :deploy_to path.
# Check directories for deploy
# [ ! -d $WORKDIR/current ] && mkdir $WORKDIR/current
[ ! -d $WORKDIR/release ] && mkdir $WORKDIR/release
[ ! -d $WORKDIR/repository ] && mkdir $WORKDIR/repository
[ ! -d $WORKDIR/share ] && mkdir $WORKDIR/share
# end directories structure
touch $WORKDIR/.lock
echo_g "Set directory structure successfully! "
}
function checkDependencies() {
echo_b "Checking dependencies for deploy procedure. "
# Refer:
# if [ -z ${var+x} ]; then
# echo "var is unset"; else echo "var is set to ‘$var‘"
# fi
# if [ "$var x" = " x" ]; then
# echo "var is empty"; else echo "var is set to ‘$var‘"
# fi
# if [ -z $var ]; then
# echo "var is empty"; else echo "var is set to ‘$var‘"
# fi
if [[ -z $SOURCEURL ]]; then
echo_r "Error: SOURCEURL is undefined! "
exit 1
fi
DISKSPACE=`df $WORKDIR | tail -n1 | awk ‘{print $(NF -2)}‘`
if [[ $DISKSPACE -lt 2097152 ]]; then
echo_y "Warnning: Disk space of $WORKDIR is smaller than 2GB"
#exit 1
fi
echo_g "All required dependencies check pass! "
}
function cleanOldReleases(){
save_days=${save_old_releases_for_days:-10}
if [ ! -d $WORKDIR/release ]; then
echo_b "Can NOT find release directory, skipping . "
return
fi
need_clean=$(find $WORKDIR/release -mtime +$save_days -exec ls {} \;)
if [ ! -z $need_clean ]; then
echo_g "Expired releases found and will be removed from project! "
find $WORKDIR/release -mtime +$save_days -exec rm -rf {} \;
if [ $? -eq 0 ]; then
echo_g "Expired releases have removed from project! "
else
echo_r "Can NOT remove expired releases, please alter to Admin users. "
fi
else
echo_g "All releases are not expired, skipping. "
fi
}
function deploy() {
# check a directories lock, Note: this is redundant
if [[ ! -f $WORKDIR/.lock ]]; then
setDirectoryStructure
fi
cleanOldReleases
checkDependencies
# Make directory to release directory
SOURCEDIR="$WORKDIR/release/$(date +%Y%m%d%H%M%S)"
[ ! -d $SOURCEDIR ] && mkdir $SOURCEDIR
# Get files from source code repository
git clone $SOURCEURL $SOURCEDIR
# svn co http://$SOURCEURL $WORKDIR/repository
# TODO
# get branchnames or revision numbers from VCS data
# Remove .git or .svn
[ -d $SOURCEDIR/.git ] && rm -rf $SOURCEDIR/.git
[ -d $SOURCEDIR/.svn ] && rm -rf $SOURCEDIR/.svn
# ifdef Complie
# endif
# Make source code symbolic link to current
( [ -f $WORKDIR/current ] || [ -d $WORKDIR/current ] ) && rm -rf $WORKDIR/current
ln -s $SOURCEDIR $WORKDIR/current
# Move conf and logs directies from release to share
[ -d $WORKDIR/release/conf ] && mv $WORKDIR/release/conf $WORKDIR/share/conf
[ -d $WORKDIR/release/logs ] && mv $WORKDIR/release/logs $WORKDIR/share/logs
# Make conf and logs symbolic link to current
[ -d $WORKDIR/share/conf ] && ln -s $WORKDIR/share/conf $WORKDIR/current/conf
[ -d $WORKDIR/share/logs ] && ln -s $WORKDIR/share/logs $WORKDIR/current/logs
# Start service or validate status
if [[ -e $WORKDIR/current/bin/startup.sh ]]; then
$WORKDIR/current/bin/startup.sh start
RETVAL=$?
else
# TODO
# external health check
RETVAL=0
fi
RETVAL=$?
# if started ok, then create a workable program to a file
if [[ $RETVAL -eq 0 ]]; then
# Note cat with eof must start at row 0, and with eof end only, such as no blank spaces, etc
cat >$WORKDIR/share/workable_program.log <<eof
$SOURCEDIR
eof
echo_g "Deploy successfully! "
echo_g "current workable version is $(cat $WORKDIR/share/workable_program.log)"
ls --color=auto -l $WORKDIR/current
else
echo_r "Error: Deploy failed! "
$0 rollback
fi
}
# Rollback to last right configuraton
function rollback() {
# The key is find last files which can work
WORKABLE_PROGRAM=`cat $WORKDIR/share/workable_program.log`
if [[ -z WORKABLE_PROGRAM ]]; then
echo_r "Error: Can NOT find workable release version! Please check if it is first deployment! "
exit 1
fi
# # Stop service
if [[ -e $WORKDIR/current/bin/startup.sh ]]; then
$WORKDIR/current/bin/startup.sh stop
fi
# Remove failed deploy
rm -rf $WORKDIR/current
# Remake source code symbolic link to current
ln -s $WORKABLE_PROGRAM $WORKDIR/current
# Remake conf and logs symbolic link to current
[ -d $WORKDIR/share/conf ] && ln -s $WORKDIR/share/conf $WORKDIR/current
[ -d $WORKDIR/share/logs ] && ln -s $WORKDIR/share/logs $WORKDIR/current
# Start service or validate status
if [[ -e $WORKDIR/current/bin/startup.sh ]]; then
$WORKDIR/current/bin/startup.sh start
RETVAL=$?
else
# TODO
# external health check
RETVAL=0
fi
RETVAL=$?
# if started ok, then create a workable program to a file
if [[ $RETVAL -eq 0 ]]; then
echo_g "Rollback successfully! "
echo_g "current workable version is $WORKABLE_PROGRAM"
ls --color=auto -l $WORKDIR/current
fi
}
function destroy() {
# echo a warnning message
echo_y "Warnning: This action will destroy all this project, and this is unrecoverable! "
answer="n"
echo_y "Do you want to destroy this project? "
read -p "(Default no,if you want please input: y ,if not please press the enter button):" answer
case "$answer" in
y|Y|Yes|YES|yes|yES|yEs|YeS|yeS )
# delete all file expect for this script self
# find: warning: Unix filenames usually don‘t contain slashes (though pathnames do). That means that ‘-name `./deploy.sh‘‘ will probably evaluate to false all the time on this system. You might find the ‘-wholename‘ test more useful, or perhaps ‘-samefile‘. Alternatively, if you are using GNU grep, you could use ‘find ... -print0 | grep -FzZ `./deploy.sh‘‘.
# echo $WORKDIR/
#find -L $WORKDIR -type f ! -name "$(basename $0)" -exec ls --color=auto -al {} \;
# find -L . -type f ! -name "deploy.sh" -exec ls --color=auto -al {} \;
# find -L . -type d -exec ls --color=auto -al {} \;
# find -L ./ -maxdepth 1 ! -name "deploy.sh" ! -wholename "./"
# ls | grep -v "fielname" |xargs rm -rf
find -L $WORKDIR -maxdepth 1 ! -name "$(basename $0)" ! -wholename "$WORKDIR" -exec rm -rf {} \;
if [ $? -eq 0 ];then
echo_g "Destory this project successfully! Now will exit with status 0. "
exit 0
else
echo_r "Error: something go wrong! Please check or alter to Admin user! "
exit 1
fi
;;
n|N|No|NO|no|nO)
echo_g "destroy action is cancel"
exit 0
;;
*)
echo_r "Are you kidding me? You are a bad kid! "
exit 1
;;
esac
}
# Just a test for call itself, comment it
# if [[ $# -lt 1 ]]; then
# $0 help
# exit
# fi
case $1 in
deploy)
deploy
;;
rollback)
rollback
;;
destroy)
destroy
;;
help|*)
echo "Usage: $0 {deploy|rollback|destroy} with $0 itself"
exit 1
;;
esac
# This is not essential with ‘case .. esac‘ handled no args excutions
# replace "exit 0" with ":"
#exit 0
:tag:自动化部署脚本,Shell部署脚本,capistrano的shell脚本实现,脚本实现自动更新和回滚,自动化部署shell脚本实例
--end--
本文出自 “通信，我的最爱” 博客，请务必保留此出处http://dgd2010.blog.51cto.com/1539422/1735106
通过Git WebHooks+脚本实现自动更新发布代码之shell脚本
标签：自动化部署脚本 shell部署脚本 capistrano的shell脚本实现 脚本实现自动更新和回滚 自动化部署shell脚本实例
原文地址：http://dgd2010.blog.51cto.com/1539422/1735106
