shell实现自动化部署项目

shell获取命令的返回值

    res=`docker run -dti -v $rootdir:/monitor -v /etc/localtime:/etc/localtime:ro 86912afeeaa8 /bin/bash`
    echo $res
    echo "${res} container is running....."

字符串和变量拼接

       imagedir="$rootdir/docker/escron.tar"

shell单双引号的区别

       

 windows和linux平台兼容

       用vi/vim命令打开脚本文件，输入“：set fileformat=unix”，回车，保存退出

写入单行文本和多行文本

       单行文本

          echo Hello > filename.txt

       多行文本 

        cat>${shelldir}/hostcron.sh<<EOF
          #! /bin/bash
          docker exec ${res} /bin/bash /monitor/shell/crontbday.sh 

          echo $(date "+%Y-%m-%d %H:%M:%S") >>${rootdir}/msgday.log

          echo \$(date "+%Y-%m-%d %H:%M:%S") >>${rootdir}/msgday.log   \表示转义字符 后面的命令做为字符串写入到文件  而不是把命令的执行结果写入到文件
         EOF

实例代码

#! /bin/bash
#执行此脚本需要root用户权限


basedir=`cd $(dirname $0); pwd -P;`
rootdir=$(dirname $basedir)
echo "the root dir is $rootdir"

echo 'loadding docker images'
imagedir="$rootdir/docker/escron.tar"
echo "the image at ${imagedir}"
docker load -i $imagedir
echo "loadding docker image complete...."

echo 'run a docker container......'
res=`docker run -dti  -v $rootdir:/monitor  -v /etc/localtime:/etc/localtime:ro 86912afeeaa8  /bin/bash`
echo $res
echo "${res} container is running....."

shelldir="$rootdir/shell"
echo "update the containerID to the shell"

cat>${shelldir}/hostcron.sh<<EOF
#! /bin/bash
docker exec ${res} /bin/bash /monitor/shell/crontb.sh
echo \$(date "+%Y-%m-%d %H:%M:%S") >>${rootdir}/msg.log
EOF

cat>${shelldir}/hostcron.sh<<EOF
#! /bin/bash
docker exec  ${res}  /bin/bash /monitor/shell/crontbday.sh
echo \$(date "+%Y-%m-%d %H:%M:%S") >>${rootdir}/msgday.log
EOF

echo 'setting the system crontab'
echo "*/60 * * * * sh ${shelldir}/hostcron.sh" >> /var/spool/cron/root
echo "1 0 * * * sh ${shelldir}/hostcronday.sh" >> /var/spool/cron/root
echo "the task is success finished.....!"

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