linux 下 nohup 日志进行 rotate 的方法

强烈推荐使用 logrotate 来完成这个需求，具体中使用了 logrotate 中的 copytruncate 方法：

社区[1]中给出了一个使用的示例，如下：

/home/bea1/basedomain/bin/nohup.out{
daily
copytruncate
dateext
olddir /home/bea1/basedomain/bin
nocompre
rotate 100
}

另外[2]中的评论中给出了具体机制的示例，如下：

Send SIGSTOP to the process, copy the log to another name, truncate the log, send SIGCONT to the process, perhaps like this:

pkill -STOP legacyappname
cp /var/log/something.log /var/log/something.log.backup
cat /dev/null > /var/log/something.log
pkill -CONT legacyappname

You could also have logrotate do the magic for you with carefully crafted pre and post rotation scripts and the copytruncate option, like so:

/var/log/something {
    daily
    rotate 5
    copytruncate
    prerotate
        # This assumes you have a pid file, of course.
        # If you don't, this could instead be a pkill like above.
        kill -STOP `cat /var/run/legacyappname.pid`
    endscript
    postrotate
        kill -CONT `cat /var/run/legacyappname.pid`
    endscript
}

参考阅读:

1. 利用Logrotate实现weblogic日志每日备份

2. https://serverfault.com/questions/189477/rotate-logs-of-a-dumb-non-interactive-application/189880#189880