ERROR: Version in "./docker-compose.yml" is unsupported. You might be seeing this error because you're using the wrong Compose file version. Either specify a supported version (e.g "2.2" or "3.3") and place your service definitions under the `services` key, or omit the `version` key and place your service definitions at the root of the file to use version 1.
For more on the Compose file format versions, see https://docs.docker.com/compose/compose-file/

错误原因：------>              docker-compose版本过低

解决方式：

一、调整文件中的版本要求

直接改成3.3  或者你保存信息中提到的版本号

 二、升级docker-compose

查看版本路径

首先要查看docker-compose的路径

# docker-compose -v
docker-compose version 1.18.0, build 8dd22a9
# whereis docker-compose
docker-compose: /usr/bin/docker-compose

升级

根据上一步的whereis找到了docker-compose的路径为：/usr/bin/docker-compose,所以下面的脚本，路径也替换为这个就可以了。

下载

curl -L https://get.daocloud.io/docker/compose/releases/download/v2.10.2/docker-compose-`uname -s`-`uname -m` > /usr/bin/docker-compose

授权

# chmod +x /usr/bin/docker-compose

测试

版本号查看

# docker-compose -v