為了讓linux主機少一些隱患，我們要盡可能把一些不需要的服務(wù)取消或者刪掉。
我們可以先來看看目前有哪些端口是開著的
[root@localhost linsc]# nmap 127.0.0.1
Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2007-12-05 21:28 CST
Interesting ports on localhost.localdomain (127.0.0.1):
(The 1652 ports scanned but not shown below are in state: closed)
PORT STATE SERVICE
21/tcp open ftp
22/tcp open ssh
25/tcp open smtp
80/tcp open http
766/tcp open unknown
3306/tcp open mysql
8009/tcp open ajp13
8080/tcp open http-proxy
Nmap run completed -- 1 IP address (1 host up) scanned in 0.194 seconds
可以看到 766 端口是打開著的，一個 unknown 的服務(wù)正在運行，這是什么服務(wù)？這個時候我也不知道。
[root@localhost linsc]# netstat -lp
可以看到有下面一條內(nèi)容，
tcp 0 0 *:766 *:* LISTEN 3128/rpc.statd
說明是 rpc.statd 正在運行。
就看766是什么命令執(zhí)行的監(jiān)聽端口的另外一個辦法
[root@localhost linsc]# lsof -i:766
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
rpc.statd 3128 rpcuser 8u IPv4 6467 TCP *:766 (LISTEN)
查看rpc.statd這個命令是那個安裝包的文檔
[root@localhost linsc]# rpm -qf /sbin/rpc.statd
nfs-utils-1.0.6-80.EL4
查看nfs開頭有那些東東
[root@localhost linsc]# ls /etc/init.d/nfs*
/etc/init.d/nfs /etc/init.d/nfslock
查看nfslock狀態(tài)
[root@localhost linsc]# /etc/init.d/nfslock status
rpc.statd (pid 3128) 正在運行...
[root@localhost linsc]# vi /etc/services
找到里面的 nfs ，在前面加 # 注釋掉，重啟，
[root@localhost linsc]# nmap 127.0.0.1
Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2007-12-05 21:55 CST
Interesting ports on localhost.localdomain (127.0.0.1):
(The 1653 ports scanned but not shown below are in state: closed)
PORT STATE SERVICE
21/tcp open ftp
22/tcp open ssh
25/tcp open smtp
80/tcp open http
3306/tcp open mysql
8009/tcp open ajp13
8080/tcp open http-proxy
Nmap run completed -- 1 IP address (1 host up) scanned in 0.194 seconds
