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+# Weave
+
+Weave 2.0.1 is supported by kubespray
+
+Weave uses [**consensus**](https://www.weave.works/docs/net/latest/ipam/##consensus) mode (default mode) and [**seed**](https://www.weave.works/docs/net/latest/ipam/#seed) mode.
+
+`Consensus` mode is best to use on static size cluster and `seed` mode is best to use on dynamic size cluster
+
+Weave encryption is supported for all communication
+
+* To use Weave encryption, specify a strong password (if no password, no encryption)
+
+```ShellSession
+# In file ./inventory/sample/group_vars/k8s_cluster.yml
+weave_password: EnterPasswordHere
+```
+
+This password is used to set an environment variable inside weave container.
+
+Weave is deployed by kubespray using a daemonSet
+
+* Check the status of Weave containers
+
+```ShellSession
+# From client
+kubectl -n kube-system get pods | grep weave
+# output
+weave-net-50wd2                       2/2       Running   0          2m
+weave-net-js9rb                       2/2       Running   0          2m
+```
+
+There must be as many pods as nodes (here kubernetes have 2 nodes so there are 2 weave pods).
+
+* Check status of weave (connection,encryption ...) for each node
+
+```ShellSession
+# On nodes
+curl http://127.0.0.1:6784/status
+# output on node1
+Version: 2.0.1 (up to date; next check at 2017/08/01 13:51:34)
+
+        Service: router
+       Protocol: weave 1..2
+           Name: fa:16:3e:b3:d6:b2(node1)
+     Encryption: enabled
+  PeerDiscovery: enabled
+        Targets: 2
+    Connections: 2 (1 established, 1 failed)
+          Peers: 2 (with 2 established connections)
+ TrustedSubnets: none
+
+        Service: ipam
+         Status: ready
+          Range: 10.233.64.0/18
+  DefaultSubnet: 10.233.64.0/18
+```
+
+* Check parameters of weave for each node
+
+```ShellSession
+# On nodes
+ps -aux | grep weaver
+# output on node1 (here its use seed mode)
+root      8559  0.2  3.0 365280 62700 ?        Sl   08:25   0:00 /home/weave/weaver --name=fa:16:3e:b3:d6:b2 --port=6783 --datapath=datapath --host-root=/host --http-addr=127.0.0.1:6784 --status-addr=0.0.0.0:6782 --docker-api= --no-dns --db-prefix=/weavedb/weave-net --ipalloc-range=10.233.64.0/18 --nickname=node1 --ipalloc-init seed=fa:16:3e:b3:d6:b2,fa:16:3e:f0:50:53 --conn-limit=30 --expect-npc 192.168.208.28 192.168.208.19
+```
+
+## Consensus mode (default mode)
+
+This mode is best to use on static size cluster
+
+### Seed mode
+
+This mode is best to use on dynamic size cluster
+
+The seed mode also allows multi-clouds and hybrid on-premise/cloud clusters deployment.
+
+* Switch from consensus mode to seed/Observation mode
+
+See [weave ipam documentation](https://www.weave.works/docs/net/latest/tasks/ipam/ipam/) and use `weave_extra_args` to enable.