linux下tomcat日志文件增长导致磁盘空间已满
因无规划，将tomcat直接放在/目录下的/usr/local/tomcat，日志文件也存在默认的路径，当日志增长，可用空间为20KB
检查发现catalina.out日志也没有做log rotation
解决方法有两个。
一、更改tomcat下logs的路径（因/home目录有134G，已用1%）
Tomcat安装目录下Logs目录下默认会产生4种日志文件：catalina.*.log，host-manager.*.log，localhost.*.log，manager.*.log。系统出现异常的时候，有时候log文件会暴涨。或开发不注意将log rotation
找到Tomcat安装目录下conf目录中的logging.properties文件，修改
1catalina.org.apache.juli.FileHandler.level = FINE
1catalina.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
1catalina.org.apache.juli.FileHandler.prefix = catalina.
2localhost.org.apache.juli.FileHandler.level = FINE
2localhost.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
2localhost.org.apache.juli.FileHandler.prefix = localhost.
3manager.org.apache.juli.FileHandler.level = FINE
3manager.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
3manager.org.apache.juli.FileHandler.prefix = manager.
4host-manager.org.apache.juli.FileHandler.level = FINE
4host-manager.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
4host-manager.org.apache.juli.FileHandler.prefix = host-manager.
将${catalina.base}/logs修改成指定目录：/home/tomcat/logs
二、对日志进行截断（不管放到哪个路径下，建议都对日志进行截断，也即logrotate）
创建logrotate配置文件
vi /etc/logrotate.d/tomcat
添加以下内容
/opt/tomcat/logs/catalina.out {
copytruncate
daily
rotate 7
compress
missingok
dateext
size 100m
}
参数说明：
specify the path to the log file.
copytruncate – creates a copy of the log file and then truncates the original to an empty file so that the service can keep on logging uninterrupted.
daily – rotates the catalina.out daily.
rotate – keeps at most 7 log files.
compress – create a gzip compressed file of the rotated files.
missingok – suppresses error messages if the file does not exist.
dateext – add the date to the filename of the archived log file.
size – rotates if the size of catalina.out is bigger than 100m.
在大多数linux系统上都可以找到文件：/etc/cron.daily/logrotate，该文件每天都会被运行。运行时会调用：
/usr/sbin/logrotate /etc/logrotate.conf
rotate掉tomcat的日志。
如果有多个tomcat实例，就需要配置多个单独的rotation文件。
手动编写定时任务：
crontab -e
2 * * * * /usr/sbin/logrotate /etc/logrotate.d/tomcat
可以顺便将tomcat的临时文件删除掉：
/opt/tomcat/logs/catalina.out {
notifempty
copytruncate
dateext
daily
rotate 10
compress
missingok
postrotate
/bin/nice /usr/bin/find /opt/tomcat/temp -type f -mtime +10 -exec /bin/rm {} \; > /dev/null
endscript
}