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authorAlex Auvolat <alex@adnab.me>2021-05-31 17:13:36 +0200
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-# Configure a cluster
-
-*We use a command named `garagectl` which is in fact an alias you must define as explained in the [Control the daemon](./daemon.md) section.*
-
-In this section, we will inform garage of the disk space available on each node of the cluster
-as well as the site (think datacenter) of each machine.
-
-## Test cluster
-
-As this part is not relevant for a test cluster, you can use this three-liner to create a basic topology:
-
-```bash
-garagectl status | grep UNCONFIGURED | grep -Po '^[0-9a-f]+' | while read id; do
- garagectl node configure -z dc1 -c 1 $id
-done
-```
-
-## Real-world cluster
-
-For our example, we will suppose we have the following infrastructure (Capacity, Identifier and Datacenter are specific values to garage described in the following):
-
-| Location | Name | Disk Space | `Capacity` | `Identifier` | `Zone` |
-|----------|---------|------------|------------|--------------|--------------|
-| Paris | Mercury | 1 To | `2` | `8781c5` | `par1` |
-| Paris | Venus | 2 To | `4` | `2a638e` | `par1` |
-| London | Earth | 2 To | `4` | `68143d` | `lon1` |
-| Brussels | Mars | 1.5 To | `3` | `212f75` | `bru1` |
-
-### Identifier
-
-After its first launch, garage generates a random and unique identifier for each nodes, such as:
-
-```
-8781c50c410a41b363167e9d49cc468b6b9e4449b6577b64f15a249a149bdcbc
-```
-
-Often a shorter form can be used, containing only the beginning of the identifier, like `8781c5`,
-which identifies the server "Mercury" located in "Paris" according to our previous table.
-
-The most simple way to match an identifier to a node is to run:
-
-```
-garagectl status
-```
-
-It will display the IP address associated with each node; from the IP address you will be able to recognize the node.
-
-### Zones
-
-Zones are simply a user-chosen identifier that identify a group of server that are grouped together logically.
-It is up to the system administrator deploying garage to identify what does "grouped together" means.
-
-In most cases, a zone will correspond to a geographical location (i.e. a datacenter).
-Behind the scene, Garage will use zone definition to try to store the same data on different zones,
-in order to provide high availability despite failure of a zone.
-
-### Capacity
-
-Garage reasons on an arbitrary metric about disk storage that is named the *capacity* of a node.
-The capacity configured in Garage must be proportional to the disk space dedicated to the node.
-Additionaly, the capacity values used in Garage should be as small as possible, with
-1 ideally representing the size of your smallest server.
-
-Here we chose that 1 unit of capacity = 0.5 To, so that we can express servers of size
-1 To and 2 To, as wel as the intermediate size 1.5 To.
-
-Note that the amount of data stored by Garage on each server may not be strictly proportional to
-its capacity value, as Garage will priorize having 3 copies of data in different zones,
-even if this means that capacities will not be strictly respected. For example in our above examples,
-nodes Earth and Mars will always store a copy of everything each, and the third copy will
-have 66% chance of being stored by Venus and 33% chance of being stored by Mercury.
-
-### Inject the topology
-
-Given the information above, we will configure our cluster as follow:
-
-```
-garagectl node configure -z par1 -c 2 -t mercury 8781c5
-garagectl node configure -z par1 -c 4 -t venus 2a638e
-garagectl node configure -z lon1 -c 4 -t earth 68143d
-garagectl node configure -z bru1 -c 3 -t mars 212f75
-```