Fix the IP address of the Raspberry Pi

Both methods are ok

1. Enter the /etc/rc.localfile:

sudo nano /etc/rc.local
sudo vi /etc/rc.local

2. Add a segment before exit0:

ifconfig wlan0 192.168.x.xxx  // 在 ifconfig wlan0 后面添加想要固定的 IP 地址

As shown in the figure:

press ctrl + o to save (if nano editor is used) and
prompt whether to write, press Enter to confirm (if nano editor is used)
press ctrl + x to exit (if nano editor is used)

3. Restart the Raspberry Pi

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Both methods are ok

1. Enter the /etc/dhcpcd.conffile:

vi /etc/dhcpcd.conf

2. Choose to add configuration items:

interface eth0								//指定接口 eth0
static ip_address=192.168.xxx.xxx/24		//指定静态IP，/24表示子网掩码为 255.255.255.0
static routers=192.168.xxx.xxx				//路由器/网关IP地址
static domain_name_servers=8.8.8.8			//手动自定义DNS服务器

save document

3. Restart the Raspberry Pi