1、nmap簡單掃描
nmap預設傳送一個ARP的PING資料包，來探測目標主機1-10000範圍內所開放的所有埠
命令語法： 
nmap <target ip address>
其中：target ip address是掃描的目標主機的ip地址
例子:nmap 173.22.90.10
[root@docker-node4 ~]# nmap 173.22.90.10
PORT    STATE SERVICE
22/tcp  open  ssh 
80/tcp  open  http
111/tcp open  rpcbind
掃描出開放的埠

2、nmap簡單掃描，並對結果返回詳細的描述輸出
命令語法：namp -vv <target ip address>
介紹：-vv引數設定對結果的詳細輸出
例子：nmap -vv    173.22.90.10
效果如下：
[root@docker-node4 ~]# nmap -vv 173.22.90.10
Starting Nmap 6.40 ( http://nmap.org ) at 2019-08-18 04:48 CST
Initiating ARP Ping Scan at 04:48
Scanning 173.22.90.10 [1 port]
Completed ARP Ping Scan at 04:48, 0.01s elapsed (1 total hosts)
Initiating Parallel DNS resolution of 1 host. at 04:48
Completed Parallel DNS resolution of 1 host. at 04:48, 6.53s elapsed
Initiating SYN Stealth Scan at 04:48
Scanning 173-22-90-10.client.mchsi.com (173.22.90.10) [1000 ports]
Discovered open port 111/tcp on 173.22.90.10
Discovered open port 80/tcp on 173.22.90.10
Discovered open port 22/tcp on 173.22.90.10