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linux netstat 网络端口占用查询

可以通过端口号查询进程, 也可以通过进程查询使用的端口号

检查端口是否被占用​

netstat 查看某个端口是否被某个进程占用​

netstat -nap | grep port-number
netstat -nap | grep pid-number

picture 0

lsof 检查端口​

sudo lsof -i :6080

picture 2

picture 1

由进程检查端口​

netstat -nap | grep pid​

netstat -nap | grep pid

ubuntu@VM-0-4-ubuntu:/data/project/ranger$ sudo netstat -nap | grep 264947
tcp        0      0 0.0.0.0:6080            0.0.0.0:*               LISTEN      264947/docker-proxy

`lsof -p pid​

lsof -p pid, 返回信息里有LISTEN端口.


ubuntu@VM-0-4-ubuntu:/data/project/ranger$ sudo lsof -p 264947
COMMAND      PID USER   FD      TYPE  DEVICE SIZE/OFF    NODE NAME
docker-pr 264947 root  cwd       DIR   252,2     4096       2 /
docker-pr 264947 root  rtd       DIR   252,2     4096       2 /
docker-pr 264947 root  txt       REG   252,2  2176502    6045 /usr/bin/docker-proxy
docker-pr 264947 root  mem       REG   252,2  2216304    8423 /usr/lib/x86_64-linux-gnu/libc.so.6
docker-pr 264947 root  mem       REG   252,2   240936    8384 /usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
docker-pr 264947 root    0r      CHR     1,3      0t0       5 /dev/null
docker-pr 264947 root    1w      CHR     1,3      0t0       5 /dev/null
docker-pr 264947 root    2w      CHR     1,3      0t0       5 /dev/null
docker-pr 264947 root    4u     IPv4 1787677      0t0     TCP *:6080 (LISTEN)
docker-pr 264947 root    6u  a_inode    0,14        0   12443 [eventpoll]
docker-pr 264947 root    7r     FIFO    0,13      0t0 1787678 pipe
docker-pr 264947 root    8w     FIFO    0,13      0t0 1787678 pipe
docker-pr 264947 root    9r     FIFO    0,13      0t0 1958327 pipe
docker-pr 264947 root   10w     FIFO    0,13      0t0 1958327 pipe
docker-pr 264947 root   11r     FIFO    0,13      0t0 1958328 pipe
docker-pr 264947 root   12w     FIFO    0,13      0t0 1958328 pipe

注意需要使用超管权限​

注意需要使用root账号或者sudo, 不然某些端口查询结果返回为空, 还以为没有被占用.

error:不使用sudo账号​

不使用sudo账号检查端口, lsof返回为空, netstat则无法显示对应的进程id.

ubuntu@VM-0-4-ubuntu:/data/project/ranger$ lsof -i:6080

ubuntu@VM-0-4-ubuntu:/data/project/ranger$ netstat -nap | grep 6080
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp        0      0 0.0.0.0:6080            0.0.0.0:*               LISTEN      -
tcp6       0      0 :::6080                 :::*                    LISTEN      -

使用sudo账号​

ubuntu@VM-0-4-ubuntu:/data/project/ranger$ sudo lsof -i:6080
COMMAND      PID USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME
docker-pr 264947 root    4u  IPv4 1787677      0t0  TCP *:6080 (LISTEN)
docker-pr 264952 root    4u  IPv6 1787688      0t0  TCP *:6080 (LISTEN)

ubuntu@VM-0-4-ubuntu:/data/project/ranger$ sudo netstat -nap | grep 6080
tcp        0      0 0.0.0.0:6080            0.0.0.0:*               LISTEN      264947/docker-proxy
tcp6       0      0 :::6080                 :::*                    LISTEN      264952/docker-proxy

进一步检查对应的进程

ubuntu@VM-0-4-ubuntu:/data/project/ranger$ ps aux | grep 264947
root      264947  0.0  0.0 1155756    0 ?        Sl   12:20   0:00 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 6080 -container-ip 172.19.0.2 -container-port 6080

ubuntu@VM-0-4-ubuntu:/data/project/ranger$ ps aux | grep 264952
root      264952  0.0  0.0 1082024  704 ?        Sl   12:20   0:00 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 6080 -container-ip 172.19.0.2 -container-port 6080

linux端口和进程查询​

通过进程查看占用端口​

1、先查看进程pid

ps -ef | grep 进程名

2、通过pid查看占用端口

netstat -nap | grep 进程pid

操作实例：

通过nginx进程查看对应的端口号

#查看nginx进程pid：
命令：
ps -ef | grep nginx
结果：
root      9836     1  0 Jul11 ?        00:00:00 nginx: master process /usr/local/nginx/sbin/nginx
nobody    9841  9836  0 Jul11 ?        00:00:09 nginx: worker process      

#通过nginx进程pid查看占用端口（进程pid为9836）
命令：
netstat -nap | grep 9836
结果：
tcp        0      0 0.0.0.0:8081                0.0.0.0:*                   LISTEN      9836/nginx          
tcp        0      0 0.0.0.0:81                  0.0.0.0:*                   LISTEN      9836/nginx          
tcp        0      0 0.0.0.0:8082                0.0.0.0:*                   LISTEN      9836/nginx          
tcp        0      0 0.0.0.0:8083                0.0.0.0:*                   LISTEN      9836/nginx

通过端口查看进程​

netstat -nap | grep 端口号

-p 显示端口进程

例：查看8081号端口对应的进程名

命令：
netstat -nap | grep 8081
结果：
tcp        0      0 0.0.0.0:8081                0.0.0.0:*                   LISTEN      9836/nginx

nslookup​

杂七杂八网络信息

域名nslookup​

nslookup可以查询dns,可以指定dns server进行查询.

local地址

(ocx) ➜  ~ nslookup gz.oss.vpc.tencentyun.com
Server:         10.11.56.23
Address:        10.11.56.23#53

** server can't find gz.oss.vpc.tencentyun.com: NXDOMAIN

(ocx) ➜  ~ nslookup gz.oss.vpc.tencentyun.com 9.208.232.140
;; connection timed out; no servers could be reached

内网地址

[root@VM-84-106-centos ~]# nslookup gz.oss.vpc.tencentyun.com 9.208.232.140
Server:         9.208.232.140
Address:        9.208.232.140#53

Non-authoritative answer:
Name:   gz.oss.vpc.tencentyun.com
Address: 9.31.48.54

[root@VM-84-106-centos ~]# nslookup gz.oss.vpc.tencentyun.com 
Server:         9.164.192.14
Address:        9.164.192.14#53

Non-authoritative answer:
Name:   gz.oss.vpc.tencentyun.com
Address: 9.31.48.54

[root@VM-84-106-centos ~]# nslookup sv.oss.vpc.tencentyun.com 
Server:         9.164.192.14
Address:        9.164.192.14#53

** server can't find sv.oss.vpc.tencentyun.com: NXDOMAIN

[root@VM-84-106-centos ~]# nslookup sv.oss.vpc.tencentyun.com  9.208.232.140
Server:         9.208.232.140
Address:        9.208.232.140#53

** server can't find sv.oss.vpc.tencentyun.com: NXDOMAIN