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Doc that you need an initialized swarm for tutorial (#5871) 

You need to initialize your swarm before starting a service on it.
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Misty Stanley-Jones 2018-01-30 16:04:38 -08:00 committed by GitHub
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10
engine/admin/prometheus.md
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@ -47,7 +47,15 @@ Docker now exposes Prometheus-compatible metrics on port 9323.
## Configure and run Prometheus ## Configure and run Prometheus
In this example, Prometheus runs as a Docker container on the same host. In this example, Prometheus runs as a Docker service on a Docker swarm.
> **Prerequisites**
>
> 1. One or more Docker engines are joined into a Docker swarm, using `docker swarm init`
> on one manager and `docker swarm join` on other managers and worker nodes.
>
> 2. You need an internet connection to pull the Prometheus image.
Copy one of the following configuration files and save it to Copy one of the following configuration files and save it to
`/tmp/prometheus.yml` (Linux or Mac) or `C:\tmp\prometheus.yml` (Windows). This `/tmp/prometheus.yml` (Linux or Mac) or `C:\tmp\prometheus.yml` (Windows). This