Linux配置开机启动特定程序和定时执行特定程序

服务器使用的是Ubuntu，开机启动特定程序和定时自动重启服务器涉及到2个文件：

• /etc/rc.local : 添加开机时自动执行特定程序的命令。
• /etc/crontab : 添加定时重启命令。

开机启动特定程序：

比如假设安装tomcat在/usr/local/tomcat/下，设置开机启动tomcat，则添加执行tomcat的bin目录下的startup.sh文件的命令：
su - root -c "/usr/local/tomcat/bin/startup.sh"。

完整的rc.local文件的配置：

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

su - root -c "/usr/local/tomcat/bin/startup.sh"



exit 0

比如需要开机启动特定java程序，java程序所在目录: /server/myProject.jar，则添加命令：
su - root -c "java -jar /server/myProject.jar".

完整的rc.local文件：

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

su - root -c "/usr/local/tomcat/bin/startup.sh"

su - root -c "java -jar /server/myProject.jar"

exit 0

定时执行特定命令

crontab文件默认的内容：

# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# m h dom mon dow user  command
17 *    * * *   root    cd / && run-parts --report /etc/cron.hourly
25 6    * * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6    * * 7   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6    1 * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
#

init 6是重启机器的命令，比如需要在每天的5:30am重启机器，则添加命令：
30 5 * * * root init 6

完整的crontab文件内容：

# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# m h dom mon dow user  command
17 *    * * *   root    cd / && run-parts --report /etc/cron.hourly
25 6    * * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6    * * 7   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6    1 * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
30 5    * * *   root    init 6
#