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diff --git a/doc/book/src/getting_started/cluster.md b/doc/book/src/getting_started/cluster.md deleted file mode 100644 index c9c18684..00000000 --- a/doc/book/src/getting_started/cluster.md +++ /dev/null @@ -1,73 +0,0 @@ -# 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 one-liner to create a basic topology: - -```bash -garagectl status | grep UNCONFIGURED | grep -Po '^[0-9a-f]+' | while read id; do - garagectl node configure -d 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` | `Datacenter` | -|----------|---------|------------|------------|--------------|--------------| -| 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. - -### 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. - -### Datacenter - -Datacenter are simply a user-chosen identifier that identify a group of server that are located in the same place. -It is up to the system administrator deploying garage to identify what does "the same place" means. -Behind the scene, garage will try to store the same data on different sites to provide high availability despite a data center failure. - -### Inject the topology - -Given the information above, we will configure our cluster as follow: - -``` -garagectl node configure --datacenter par1 -c 2 -t mercury 8781c5 -garagectl node configure --datacenter par1 -c 4 -t venus 2a638e -garagectl node configure --datacenter lon1 -c 4 -t earth 68143d -garagectl node configure --datacenter bru1 -c 3 -t mars 212f75 -``` |