> For the complete documentation index, see [llms.txt](https://camelgemonion.gitbook.io/docker/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://camelgemonion.gitbook.io/docker/dockercompose.yaml-wen-jian-zhong-chang-yong-zhi-ling/untitled-12/untitled-2/untitled-5.md).

# max\_replicas\_per\_node

如果服务是replicated模式(默认模式), 这个属性可以在任意时间用来限制节点上面容器的副本数量。

当请求的任务数超过运行的节点数量时，会产生异常报错：no suitable node (max replicas per node limit exceed)。

```
version: "3.9"
services:
  worker:
    image: dockersamples/examplevotingapp_worker
    networks:
      - frontend
      - backend
    deploy:
      mode: replicated
      replicas: 6
      placement:
        max_replicas_per_node: 1
```