'./docker-compose.yml'，服务必须是一个映射，而不是一个NoneType

Question

当我跑：COMPOSE_PROJECT_NAME=zk_test docker-compose up，我得到了错误，说

"ERROR: In file './docker-compose.yml', service must be a mapping, not a NoneType.".

这是我的YML文件：

version: '2' 
services: 
zoo1: 
image: zookeeper 
restart: always 
container_name: zoo1 
ports: 
- "2181:2181" 
environment: 
ZOO_MY_ID: 1 
ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888 

zoo2: 
image: zookeeper 
restart: always 
container_name: zoo2 
ports: 
- "2182:2181" 
environment: 
ZOO_MY_ID: 2 
ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888 

zoo3: 
image: zookeeper 
restart: always 
container_name: zoo3 
ports: 
- "2183:2181" 
environment: 
ZOO_MY_ID: 3 
ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888 

示例图像：

Answer 1

YAML是缩进依赖性的。此

services: 
zoo1: 

是具有两个键的映射，这两个图来null（即在Python None）。

鉴于：

services: 
    zoo1: 

是嵌套在映射的映射。关键'服务'具有与密钥zoo1（其值也为null）的映射值。