有幾種方法來查看當前服務和端口
1、使用lsof命令
axing@ax:/usr/local$ sudo lsof -i -P -n | grep LISTEN
nrpe 1243 nagios 4u IPv4 15903 0t0 TCP *:5666 (LISTEN)
nrpe 1243 nagios 5u IPv6 15904 0t0 TCP *:5666 (LISTEN)
apache2 1261 root 4u IPv6 17682 0t0 TCP *:80 (LISTEN)
master 1509 root 12u IPv4 19054 0t0 TCP *:25 (LISTEN)
master 1509 root 13u IPv6 19055 0t0 TCP *:25 (LISTEN)
apache2 7711 www-data 4u IPv6 17682 0t0 TCP *:80 (LISTEN)
apache2 8575 www-data 4u IPv6 17682 0t0 TCP *:80 (LISTEN)
apache2 8576 www-data 4u IPv6 17682 0t0 TCP *:80 (LISTEN)
apache2 8578 www-data 4u IPv6 17682 0t0 TCP *:80 (LISTEN)
apache2 8579 www-data 4u IPv6 17682 0t0 TCP *:80 (LISTEN)
zabbix_ag 8632 zabbix 5u IPv4 37663882 0t0 TCP *:10050 (LISTEN)
zabbix_ag 8632 zabbix 6u IPv6 37663883 0t0 TCP *:10050 (LISTEN)
zabbix_ag 8633 zabbix 5u IPv4 37663882 0t0 TCP *:10050 (LISTEN)
zabbix_ag 8633 zabbix 6u IPv6 37663883 0t0 TCP *:10050 (LISTEN)
zabbix_ag 8634 zabbix 5u IPv4 37663882 0t0 TCP *:10050 (LISTEN)
zabbix_ag 8634 zabbix 6u IPv6 37663883 0t0 TCP *:10050 (LISTEN)
zabbix_ag 8635 zabbix 5u IPv4 37663882 0t0 TCP *:10050 (LISTEN)
zabbix_ag 8635 zabbix 6u IPv6 37663883 0t0 TCP *:10050 (LISTEN)
zabbix_ag 8637 zabbix 5u IPv4 37663882 0t0 TCP *:10050 (LISTEN)
zabbix_ag 8637 zabbix 6u IPv6 37663883 0t0 TCP *:10050 (LISTEN)
zabbix_ag 8638 zabbix 5u IPv4 37663882 0t0 TCP *:10050 (LISTEN)
zabbix_ag 8638 zabbix 6u IPv6 37663883 0t0 TCP *:10050 (LISTEN)
apache2 17479 www-data 4u IPv6 17682 0t0 TCP *:80 (LISTEN)
apache2 17496 www-data 4u IPv6 17682 0t0 TCP *:80 (LISTEN)
apache2 17770 www-data 4u IPv6 17682 0t0 TCP *:80 (LISTEN)
apache2 17782 www-data 4u IPv6 17682 0t0 TCP *:80 (LISTEN)
apache2 17800 www-data 4u IPv6 17682 0t0 TCP *:80 (LISTEN)
mysqld 19346 mysql 24u IPv4 38069095 0t0 TCP 127.0.0.1:3306 (LISTEN)
sshd 22627 root 3u IPv4 38071873 0t0 TCP *:22 (LISTEN)
sshd 22627 root 4u IPv6 38071875 0t0 TCP *:22 (LISTEN)
2、使用netstat命令
axing@ax:/usr/local$ sudo netstat -tulpn | grep LISTEN
tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 19346/mysqld
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 22627/sshd
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 1509/master
tcp 0 0 0.0.0.0:10050 0.0.0.0:* LISTEN 8632/zabbix_agentd
tcp 0 0 0.0.0.0:5666 0.0.0.0:* LISTEN 1243/nrpe
tcp6 0 0 :::80 :::* LISTEN 1261/apache2
tcp6 0 0 :::22 :::* LISTEN 22627/sshd
tcp6 0 0 :::25 :::* LISTEN 1509/master
tcp6 0 0 :::10050 :::* LISTEN 8632/zabbix_agentd
tcp6 0 0 :::5666 :::* LISTEN 1243/nrpe
# 查看網絡接口信息
axing@ax:/usr/local$ netstat -i
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
ens3 1500 0 29865622 0 339935 0 35615174 0 0 0 BMRU
lo 65536 0 339568 0 0 0 339568 0 0 0 LRU
#其他參數：
#列出所有端口: netstat -a
#列出所有tcp端口: netstat -at
#列出所有udp端口: netstat -au
#只顯示監聽端口: netstat -l
#列出所有監聽tcp端口: netstat -lt
#列出所有監聽udp端口: netstat -lu
#列出所有監聽UNIX端口: netstat -lx
3、使用nmap命令sudo nmap -sT -O localhost 或者 sudo nmap -sTU -O localhost 掃描TCP / TCP及UDP
axing@ax:/usr/local$ sudo nmap -sT -O localhost
Starting Nmap 7.01 ( https://nmap.org ) at 2019-01-15 16:11 GMT
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00028s latency).
Other addresses for localhost (not scanned): ::1
Not shown: 995 closed ports
PORT STATE SERVICE
22/tcp open ssh
25/tcp open smtp
80/tcp open http
3306/tcp open mysql
5666/tcp open nrpe
Device type: general purpose
Running: Linux 3.X
OS CPE: cpe:/o:linux:linux_kernel:3
OS details: Linux 3.12 - 3.19, Linux 3.8 - 3.19
Network Distance: 0 hops
OS detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 3.61 seconds
TCP/UDP端口一起掃描
axing@ax:/usr/local$ sudo nmap -sTU -O localhost
Starting Nmap 7.01 ( https://nmap.org ) at 2019-01-15 16:12 GMT
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00028s latency).
Other addresses for localhost (not scanned): ::1
Not shown: 1994 closed ports
PORT STATE SERVICE
22/tcp open ssh
25/tcp open smtp
80/tcp open http
3306/tcp open mysql
5666/tcp open nrpe
161/udp open snmp
Device type: general purpose
Running: Linux 3.X
OS CPE: cpe:/o:linux:linux_kernel:3
OS details: Linux 3.12 - 3.19, Linux 3.8 - 3.19
Network Distance: 0 hops
OS detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 6.99 seconds