Linux常用命令整理—网络

配置静态网络：https://blog.csdn.net/qq_46237746/article/details/124532376

[root@hadoop100 ~]# hostname -i
192.168.10.100

[root@hadoop100 ~]# ifconfig
docker0: flags=4163  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        inet6 fe80::42:3aff:fe6a:334a  prefixlen 64  scopeid 0x20
        ether 02:42:3a:6a:33:4a  txqueuelen 0  (Ethernet)
        RX packets 106775  bytes 32705809 (31.1 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 106785  bytes 34201827 (32.6 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens33: flags=4163  mtu 1500
        inet 192.168.10.50  netmask 255.255.255.0  broadcast 192.168.10.255
        inet6 fe80::4858:ffc9:dee5:1904  prefixlen 64  scopeid 0x20
        ether 00:0c:29:27:4d:95  txqueuelen 1000  (Ethernet)
        RX packets 1163694  bytes 86105685 (82.1 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1830739  bytes 513445790 (489.6 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
//TODO

[root@hadoop100 ~]# ping www.baidu.com
PING www.a.shifen.com (14.215.177.38) 56(84) bytes of data.
64 bytes from 14.215.177.38 (14.215.177.38): icmp_seq=1 ttl=128 time=11.5 ms
64 bytes from 14.215.177.38 (14.215.177.38): icmp_seq=2 ttl=128 time=11.4 ms

[root@hadoop100 ~]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: active (running) since 二 2022-05-03 20:36:45 CST; 56min ago		# running说明防火墙正在打开
     Docs: man:firewalld(1)
 Main PID: 783 (firewalld)
   Memory: 30.1M
   CGroup: /system.slice/firewalld.service
           └─783 /usr/bin/python -Es /usr/sbin/firewalld --nofork --nopid

[root@hadoop100 ~]# systemctl stop firewalld

[root@hadoop100 ~]# systemctl start firewalld

[root@hadoop100 ~]# systemctl restart firewalld.service

[root@hadoop100 ~]# systemctl enable firewalld.service
Created symlink from /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service to /usr/lib/systemd/system/firewalld.service.
Created symlink from /etc/systemd/system/basic.target.wants/firewalld.service to /usr/lib/systemd/system/firewalld.service.

[root@hadoop100 ~]# systemctl disable firewalld.service
Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.

[root@hadoop100 ~]# netstat -ntulp		
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:3306            0.0.0.0:*               LISTEN      3472/docker-proxy   
tcp        0      0 0.0.0.0:6379            0.0.0.0:*               LISTEN      3430/docker-proxy   
tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN      1/systemd           
tcp        0      0 0.0.0.0:9200            0.0.0.0:*               LISTEN      3679/docker-proxy  

参数说明：

• -t (tcp) 仅显示tcp相关选项
• -u (udp)仅显示udp相关选项
• -n 拒绝显示别名，能显示数字的全部转化为数字
• -l 仅列出在Listen(监听)的服务状态
• -p 显示建立相关链接的程序名

[root@hadoop100 ~]# netstat -ntulp |grep 3306
tcp        0      0 0.0.0.0:3306            0.0.0.0:*               LISTEN      3164/docker-proxy   
tcp6       0      0 :::3306                 :::*                    LISTEN      3170/docker-proxy 

[root@hadoop100 ~]# firewall-cmd --add-port=801/tcp --permanent
success

[root@hadoop100 ~]# firewall-cmd --reload
success

[root@hadoop100 ~]# firewall-cmd --query-port=801/tcp
yes

注意：打开端口并不意味着端口被监听或者被占用，若端口只打开未被监听，则查看端口监听情况依旧为空，具体如下：

[root@hadoop100 ~]# netstat -ntulp |grep 801
[root@hadoop100 ~]# 

[root@hadoop100 ~]# firewall-cmd --permanent --remove-port=801/tcp
success