如何在linux下判断web服务是否开启？
对于web服务的开启的判断有以下几种常用方法：1、端口查看： 本地：ss，netstat，lsof123456789101112131415161718192021222
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示例一：
ss：查看80端口是否处于监听状态
[root@gw oldboy]# ss -an|grep 80
LISTEN 0 511 :::80 :::*
示例二：
netstat：查看80端口/httpd服务是否开启
[root@gw oldboy]# netstat -lntup|grep 80
tcp 0 0 :::80 :::* LISTEN 2317/httpd
[root@gw oldboy]# netstat -lntup|grep httpd
tcp 0 0 :::80 :::* LISTEN 2317/httpd
示例三：
lsof：查看80端口是否处于
[root@gw oldboy]# lsof -i :80
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
httpd 2317 root 4u IPv6 13199 0t0 TCP *:http (LISTEN)
httpd 2320 apache 4u IPv6 13199 0t0 TCP *:http (LISTEN)
httpd 2321 apache 4u IPv6 13199 0t0 TCP *:http (LISTEN)
httpd 2322 apache 4u IPv6 13199 0t0 TCP *:http (LISTEN)
httpd 2323 apache 4u IPv6 13199 0t0 TCP *:http (LISTEN)
httpd 2324 apache 4u IPv6 13199 0t0 TCP *:http (LISTEN)
httpd 2325 apache 4u IPv6 13199 0t0 TCP *:http (LISTEN)
httpd 2326 apache 4u IPv6 13199 0t0 TCP *:http (LISTEN)
httpd 2327 apache 4u IPv6 13199 0t0 TCP *:http (LISTEN)
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示例一：
nmap：检测端口开启状态
[root@niaoyun ~]# nmap 192.168.1.21 -p 80
Starting Nmap 5.51 ( http://nmap.org ) at 2015-08-30 21:59 CST
Nmap scan report for 192.168.1.21
Host is up (0.00013s latency).
PORT STATE SERVICE
80/tcp closed http <== 注意这里
MAC Address: 00:0C:29:19:FC:7D (VMware)
Nmap done: 1 IP address (1 host up) scanned in 0.10 seconds
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[root@niaoyun ~]# ps -ef|grep httpd
root 1249 1 0 22:05 ? 00:00:00 /usr/sbin/httpd
apache 1251 1249 0 22:05 ? 00:00:00 /usr/sbin/httpd
apache 1252 1249 0 22:05 ? 00:00:00 /usr/sbin/httpd
apache 1253 1249 0 22:05 ? 00:00:00 /usr/sbin/httpd
apache 1254 1249 0 22:05 ? 00:00:00 /usr/sbin/httpd
apache 1255 1249 0 22:05 ? 00:00:00 /usr/sbin/httpd
apache 1256 1249 0 22:05 ? 00:00:00 /usr/sbin/httpd
apache 1257 1249 0 22:05 ? 00:00:00 /usr/sbin/httpd
apache 1258 1249 0 22:05 ? 00:00:00 /usr/sbin/httpd
root 1260 1117 0 22:05 pts/0 00:00:00 grep httpd
[root@niaoyun ~]# ps -ef|grep httpd|wc -l
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[root@niaoyun ~]# curl -I 192.168.1.20
HTTP/1.1 200 OK
Date: Sun, 30 Aug 2015 14:16:55 GMT
Server: Apache/2.2.15 (CentOS)
Last-Modified: Sun, 30 Aug 2015 14:16:23 GMT
ETag: "5fda3-13-51e87f62ea815"
Accept-Ranges: bytes
Content-Length: 19
Connection: close
Content-Type: text/html; charset=UTF-8
[root@niaoyun ~]# curl -I -s 192.168.1.20|head -1
HTTP/1.1 200 OK
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示例一：
wget：爬虫测试
[root@niaoyun ~]# wget --spider --timeout=10 192.168.1.20
Spider mode enabled. Check if remote file exists.
--2015-08-30 22:23:34-- http://192.168.1.20/
Connecting to 192.168.1.20:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 19 [text/html]
Remote file exists and could contain further links,
but recursion is disabled -- not retrieving.
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