initial attempt at a spec for using castle

2016-07-14 14:00:21 -07:00
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+# Starting your first castle cluster
+
+### 1) Create a new cluster
+
+To create a new cluster you must generate a new cluster token. This can easily be done using 
+the publicly hosted castle discovery service:
+
+```
+curl -w "\n" 'https://discovery.castle.io/new?min-size=3'
+https://discovery.castle.io/6a28e078895c5ec737174db2419bb2f3078895c5ec737174db2419bb2f3
+```
+
+The minimum size parameter can be used to prevent the cluster from starting up until
+the specified number of nodes join.
+
+### 2) Add nodes to the cluster
+
+You now need to start castle on nodes which will automatically find each other through
+the discovery service and form a cluster. You can run the castle nodes using a number
+of different approaches.
+
+#### Running manually
+
+Download castle from http://github.com/quantum/castle/releases
+
+```
+castle \
+  --discovery=https://discovery.castle.io/6a28e078895c5ec737174db2419bb2f3078895c5ec737174db2419bb2f3 \
+  --address 10.0.10.1:70000 \
+  --devices sda,sdb,sdc \
+  --public-network 10.0.10.0/24 \
+  --private-network 10.0.20.0/24
+```
+
+TODO: other options: CPU affinity and limiting to support hyper-converged
+TODO: crush location for example, data-center=red,rack=17,server=blue23
+TODO: choices for selecting the kind of hardware? NVMe etc.? or can we autodetect?
+
+#### Running from systemd
+
+TODO:
+
+#### Running from docker
+
+TODO: privileged container with /dev mapped?
+
+#### Running from rkt
+
+TODO: rkt fly
+
+#### Running on CoreOS
+
+TODO: show how castle can be configured from cloud-init and started
+
+#### Running from Ubuntu
+
+#### Running from Centos
+
+At this point the storage cluster is up and running.
+
+### 3) Using castlectl
+
+Now that the cluster is up and running, you can communicate with it using castletctl. 
+
+```
+export CASTLE_DISCOVERY=https://discovery.castle.io/6a28e078895c5ec737174db2419bb2f3078895c5ec737174db2419bb2f3
+
+castlectl node ls
+```
+
+the output shows the nodes that are part of the cluster
+
+```
+ADDRESS           STATE       CLUSTER         SIZE     LOCATION                 UPDATED
+10.0.10.1:70000   OK          6a28e078895c5e  30 TiB   dc=A,rack=17,server=a    1 sec ago
+10.0.10.2:70000   OK          6a28e078895c5e  40 TiB   dc=A,rack=18,server=b    1 sec ago
+10.0.10.3:70000   OK          6a28e078895c5e  50 TiB   dc=A,rack=19,server=c    1 sec ago
+```
+
+### 4) Creating a volume
+
+To create a volume run the following:
+
+```
+castlectl volume create myvolume 100GiB
+```
+
+This creates a volume that can be used as a block device from client nodes.
+
+### 5) Mount the volume on a client node
+
+To mount the volume run the following on the client node:
+
+```
+export CASTLE_DISCOVERY=https://discovery.castle.io/6a28e078895c5ec737174db2419bb2f3078895c5ec737174db2419bb2f3
+sudo castleblk rbd myvolume
+```
+
+You can mount the volume through NBD or RBD.