network "xxx" is declared as external, but could not be found. .You need to create a swarm-scoped n

启动Docker compose报错：

报错内容：

network "school-service-net" is declared as external, but could not be found. 
You need to create a swarm-scoped network before the stack is deployed

解决办法：启动前手动创建overlay类型network

docker network create --driver overlay school-service-net

再次启动就好了：
通过potainer查看容器启动正常：

参考： https://stackoverflow.com/questions/58161371/network-hbase-is-declared-as-external-but-could-not-be-found-you-need-to-cre