I have a 3 machine setup for our Tridion 2013 installation

1. Content Management Server
2. Staging CD Server (with XPM)
3. Live CD Server (no XPM)

These machines have access to 3 database servers respectively

1. Content Management Database Server
2. Staging Broker Database Server
3. Live Broker Database Server

I am now migrating these to SDL Web 8, and I am a bit confused about what is needed where (Do I need one discovery services for each environment?). Could someone confirm or reject my understanding.

NOTE: We do not use monitoring, contextual image delivery, audience manager or UGC.

Content Management

1. On the CM Database server I will install the CM DB and the Topology Manager DB
2. I then install the content manager, and run the Topology Manager scripts on the Content Management Server

Staging CD Environment

1. I create the Broker Database 3 times (for Discovery, XPM and Content Broker Content) on the Staging Broker DB Server
2. I install 5 standalone micro services for Content, Preview, Discovery, Deployment and Cache Channel

Live CD Environment

1. I create the Broker Database 2 times (for Discovery, Content Broker Content) on the Staging Broker DB Server
2. I install the 4 standalone micro services for Content, Discovery, Deployment and Cache Channel

If this is the case, how does this map to Topology Manager assuming I want to be able to

1. Publish to staging and live when I press "Publish to Live"
2. Publish to just staging when I press "Publish to Staging"

Thanks in advance for any clarifications

I have a 3 machine setup for our Tridion 2013 installation

1. Content Management Server
2. Staging CD Server (with XPM)
3. Live CD Server (no XPM)

These machines have access to 3 database servers respectively

1. Content Management Database Server
2. Staging Broker Database Server
3. Live Broker Database Server

I am now migrating these to SDL Web 8, and I am a bit confused about what is needed where (Do I need one discovery services for each environment?). Could someone confirm or reject my understanding.

NOTE: We do not use monitoring, contextual image delivery, audience manager or UGC.

Content Management

1. On the CM Database server I will install the CM DB and the Topology Manager DB
2. I then install the content manager, and run the Topology Manager scripts on the Content Management Server

Staging CD Environment

1. I create the Broker Database 3 times (for Discovery, XPM and Content Broker Content) on the Staging Broker DB Server
2. I install 5 standalone micro services for Session Enabled Content, Preview, Discovery, Deployment and Cache Channel

Live CD Environment

1. I create the Broker Database 2 times (for Discovery, Content Broker Content) on the Staging Broker DB Server
2. I install the 4 standalone micro services for Content, Discovery, Deployment and Cache Channel

If this is the case, how does this map to Topology Manager assuming I want to be able to

1. Publish to staging and live when I press "Publish to Live"
2. Publish to just staging when I press "Publish to Staging"

Thanks in advance for any clarifications