find ./ ! (-name “.mp3” -o -name “*.avi”) -type f -exec rm -f {} ;
find命令
功能：在目录结构中搜索文件，并执行指定的操作。此命令提供了相当多的查找条件，功能很强大。
语法：find 起始目录 寻找条件操作
说明：find命令从指定的起始目录开始，递归地搜索其各个子目录，查找满足寻找条件的文件并对之采取相关的操作。
shell>tar -zxvf proftpd-1.2.10.tar.gz
shell>./configure –prefix=/usr/local/proftp
shell>make
shell>make install
如果想让系统启动时自动启动proftpd，具体配置如下：
shell>cd proftpd-1.2.10
shell>cp contrib/dist/rpm/proftpd.init.d /etc/rc.d/init.d/proftpd
shell>chkconfig –add proftpd
shell>chmod 755 proftpd
shell>chkconfig –level 3 proftpd on
今天同事跟我说网站的图片不能显示了，后来检查的时候发现一个ＮＦＳ的怪异现象。
在mount nfs目录时出现错误：
mount -t nfs 192.168.1.172:/nfs/mp3/mp3files /web/mp3/mp3files
mount: 192.168.1.172:/nfs/mp3/mp3files failed, reason given by server: Permission denied
我原来的/etc/exportfs是这样的：
[root@ha1 nfs]# cat /etc/exports
/nfs/mp3/mp3files 192.168.1.*(rw,async)
一直都用的好好的，其它的机器通过内网ＩＰ来mount这台上面的数据。
所以我想应该是我做了什么造成的，因为之前我看到/var/log/messages:
mountd[3082]: Fake hostname rs0.xxxxxxcom for 192.168.1.69 - forward lookup doesn’t exist
每天服务器都遭受着上千次的SSH失败的尝试：
sshd:
Authentication Failures:
root (218.247.185.218): 575 Time(s)
unknown (218.247.185.218): 224 Time(s)
unknown (218.247.185.222): 6 Time(s)
unknown (202.101.72.35): 5 Time(s)
unknown (202.101.72.36): 5 Time(s)
unknown (202.101.72.37): 5 Time(s)
unknown (202.101.72.44): 5 Time(s)
unknown (202.101.72.32): 4 Time(s)
unknown (202.101.72.40): 4 Time(s)
unknown (202.101.72.43): 4 Time(s)
unknown (202.101.72.45): 4 Time(s)
unknown (202.101.72.47): 4 Time(s)
unknown (202.101.72.50): 4 Time(s)
unknown (202.101.72.53): 4 Time(s)
unknown (202.101.72.56): 4 Time(s)
unknown (202.101.72.57): 4 Time(s)
unknown (202.101.72.60): 4 Time(s)
unknown (202.101.72.62): 4 Time(s)
root (218.247.185.222): 3 Time(s)
unknown (202.101.72.33): 3 Time(s)
unknown (202.101.72.34): 3 Time(s)
unknown (202.101.72.38): 3 Time(s)
unknown (202.101.72.39): 3 Time(s)
unknown (202.101.72.41): 3 Time(s)
unknown (202.101.72.48): 3 Time(s)
unknown (202.101.72.51): 3 Time(s)
unknown (202.101.72.52): 3 Time(s)
unknown (202.101.72.54): 3 Time(s)
unknown (202.101.72.55): 3 Time(s)
unknown (202.101.72.58): 3 Time(s)
unknown (202.101.72.61): 3 Time(s)
unknown (202.101.72.63): 3 Time(s)
ftp (202.101.72.34): 2 Time(s)
mail (218.247.185.218): 2 Time(s)
mysql (218.247.185.218): 2 Time(s)
news (218.247.185.218): 2 Time(s)
root (192.168.123.69): 2 Time(s)
unknown (202.101.72.42): 2 Time(s)
unknown (202.101.72.46): 2 Time(s)
unknown (202.101.72.49): 2 Time(s)
unknown (202.101.72.59): 2 Time(s)
adm (202.101.72.34): 1 Time(s)
adm (202.101.72.42): 1 Time(s)
adm (202.101.72.46): 1 Time(s)
adm (202.101.72.49): 1 Time(s)
adm (202.101.72.51): 1 Time(s)
adm (202.101.72.58): 1 Time(s)
adm (202.101.72.59): 1 Time(s)
adm (202.101.72.61): 1 Time(s)
adm (218.247.185.218): 1 Time(s)
apache (218.247.185.218): 1 Time(s)
bin (218.247.185.218): 1 Time(s)
ftp (202.101.72.33): 1 Time(s)
ftp (202.101.72.39): 1 Time(s)
ftp (202.101.72.46): 1 Time(s)
ftp (202.101.72.58): 1 Time(s)
ftp (202.101.72.60): 1 Time(s)
ftp (218.247.185.218): 1 Time(s)
games (218.247.185.218): 1 Time(s)
lp (218.247.185.218): 1 Time(s)
mysql (202.101.72.38): 1 Time(s)
mysql (202.101.72.39): 1 Time(s)
mysql (202.101.72.42): 1 Time(s)
mysql (202.101.72.49): 1 Time(s)
mysql (202.101.72.51): 1 Time(s)
mysql (202.101.72.59): 1 Time(s)
mysql (202.101.72.61): 1 Time(s)
nobody (218.247.185.218): 1 Time(s)
operator (218.247.185.218): 1 Time(s)
postgres (202.101.72.33): 1 Time(s)
postgres (202.101.72.48): 1 Time(s)
postgres (202.101.72.49): 1 Time(s)
postgres (202.101.72.52): 1 Time(s)
postgres (202.101.72.53): 1 Time(s)
postgres (202.101.72.54): 1 Time(s)
rpm (218.247.185.218): 1 Time(s)
squid (218.247.185.218): 1 Time(s)
sshd (218.247.185.218): 1 Time(s)
Invalid Users:
Unknown Account: 341 Time(s)
