首先查找docker的IP, 在终端输入：
ifconfig docker0输出：
docker0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.18.0.1 netmask 255.255.0.0 broadcast 172.18.255.255
inet6 fe80::42:ebff:fed8:9ff5 prefixlen 64 scopeid 0x20<link>
ether 02:42:eb:d8:9f:f5 txqueuelen 0 (Ethernet)
RX packets 155413 bytes 76450461 (76.4 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 192249 bytes 384602416 (384.6 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0其中的IP 172.18.0.1就是我们需要找的IP
假设有一个docker-compose.yml， 我们需要将上述IP添加到extra_hosts之下：
version: '3'
services:
strapi-v4:
image: naskio/strapi
restart: always
container_name: strapi-v4
ports:
- '1337:1337'
environment:
NODE_ENV: production
DATABASE_CLIENT: mysql
DATABASE_HOST: #因为mysql只允许localhost，所以提示我将172.21.0.2设置白名单。 这里就是填写172.21.0.2。
DATABASE_PORT: 3306
DATABASE_NAME: strapi
DATABASE_USERNAME: strapi
DATABASE_PASSWORD: xxxxxxxxx
DATABASE_SSL: false # boolean for SSL.
volumes:
- /root/strapi/app:/srv/app # create a new project in app volume
extra_hosts:
- "host.docker.internal:172.18.0.1"