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火牛视频直播打赏二开视频打赏源码 联邦在线官方_相关云计算内容

 
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怎么查看Linux端口占用情况

一、前言

在 Linux 系统的使用中,经常会有端口占用的情况发生,导致程序无法安装,正常运行,稍微懂一点计算机网络的大家都知道,当一个程序占用了某个端口之后,这个端口就不能再被其他程序使用了。经常有朋友问PCCV CentOS,Ubuntu,Debian 系统这出了问题那出了问题,前几步检查必查的就是端口占用。那么怎么去检测查看,Linux系统的端口占用情况呢?PCCV这里介绍几种常见和通用的办法。

[root@localhost ~]# netstat -a
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 *:ssh *:* LISTEN
tcp 0 0 112.187.25.63:ssh 1.82.42.240:24652 ESTABLISHED
tcp 0 48 112.187.25.63:ssh 1.82.42.240:21566 ESTABLISHED
tcp 0 0 *:mysql *:* LISTEN
tcp 0 0 *:http *:* LISTEN
tcp 0 0 *:ssh *:* LISTEN
tcp 0 0 *:https *:* LISTEN
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags Type State I-Node Path
unix 2 [ ACC ] STREAM LISTENING 175386141 /tmp/mysql.sock
unix 4 [ ] DGRAM 162171201 /dev/log
unix 2 [ ACC ] STREAM LISTENING 10113 @/com/ubuntu/upstart
unix 2 [ ] DGRAM 11512 @/org/kernel/udev/udevd
unix 2 [ ] DGRAM 172411497
unix 2 [ ] DGRAM 162372037
unix 3 [ ] STREAM CONNECTED 13919
unix 3 [ ] STREAM CONNECTED 13918
unix 3 [ ] DGRAM 11531
unix 3 [ ] DGRAM 11530
[root@localhost ~]#


二、查看方法

首先,当你无法运行以下命令时候,请检查是否已经安装相应软件,您可以用以下命令安装:

# 安装 netstat 需要的组件
$ yum install net-tools # CentOS 系列系统
$ apt-get install net-tools # Ubuntu 和 Debian 系列系统

# 安装 lsof
$ yum install lsof # CentOS 系列系统
$ apt-get install lsof # Ubuntu 和 Debian
netstat 的用法参数如下:

-a 显示所有连接
-t 显示TCP端口
-u 显示UDP端口
-l 仅显示套接字监听的端口
-n 用数字显示ip和端口
-p 显示端口对应的进程PID和名字
所以我们就可以这么查看

$ netstat -atunp # 查看已经建立连接的端口情况命令
$ netstat -tunlp #显示所有服务器端口监听使用情况
当80端口被占用的时候可以这么用

$ netstat -tunlp | grep 80 # 查看80端口情况


lsof 的功能也比较强大,这里我们用到的是 -i 参数,用法如下

lsof -i # 列出所有端口情况
lsof -i:[端口] # [端口] 换成在要查询的占用端口
# 如查询 80 端口
lsof -i:80


三、后记

查询到端口占用后,不一定非要杀死这个进程。也可以换一个没被占用的端口用,如果无法更改端口,又决心如果决心想用相应端口,可以用 kill 命令杀死对应占用程序。

kill -9 [pid] # [pid] 换成在上面命令获得的进程PID

微信打赏后才能看视频

103.233.254.0
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