98 lines
3.2 KiB
Markdown
98 lines
3.2 KiB
Markdown
# Weave
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Weave 2.0.1 is supported by kubespray
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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.
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`Consensus` mode is best to use on static size cluster and `seed` mode is best to use on dynamic size cluster
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Weave encryption is supported for all communication
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* To use Weave encryption, specify a strong password (if no password, no encryption)
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```ShellSession
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# In file ./inventory/sample/group_vars/k8s-cluster.yml
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weave_password: EnterPasswordHere
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```
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This password is used to set an environment variable inside weave container.
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Weave is deployed by kubespray using a daemonSet
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* Check the status of Weave containers
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```ShellSession
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# From client
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kubectl -n kube-system get pods | grep weave
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# output
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weave-net-50wd2 2/2 Running 0 2m
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weave-net-js9rb 2/2 Running 0 2m
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```
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There must be as many pods as nodes (here kubernetes have 2 nodes so there are 2 weave pods).
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* Check status of weave (connection,encryption ...) for each node
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```ShellSession
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# On nodes
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curl http://127.0.0.1:6784/status
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# output on node1
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Version: 2.0.1 (up to date; next check at 2017/08/01 13:51:34)
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Service: router
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Protocol: weave 1..2
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Name: fa:16:3e:b3:d6:b2(node1)
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Encryption: enabled
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PeerDiscovery: enabled
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Targets: 2
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Connections: 2 (1 established, 1 failed)
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Peers: 2 (with 2 established connections)
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TrustedSubnets: none
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Service: ipam
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Status: ready
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Range: 10.233.64.0/18
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DefaultSubnet: 10.233.64.0/18
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```
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* Check parameters of weave for each node
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```ShellSession
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# On nodes
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ps -aux | grep weaver
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# output on node1 (here its use seed mode)
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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
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```
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## Consensus mode (default mode)
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This mode is best to use on static size cluster
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### Seed mode
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This mode is best to use on dynamic size cluster
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The seed mode also allows multi-clouds and hybrid on-premise/cloud clusters deployment.
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* Switch from consensus mode to seed mode
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```ShellSession
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# In file ./inventory/sample/group_vars/k8s-cluster.yml
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weave_mode_seed: true
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```
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These two variables are only used when `weave_mode_seed` is set to `true` (**/!\ do not manually change these values**)
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```ShellSession
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# In file ./inventory/sample/group_vars/k8s-cluster.yml
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weave_seed: uninitialized
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weave_peers: uninitialized
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```
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The first variable, `weave_seed`, contains the initial nodes of the weave network
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The second variable, `weave_peers`, saves the IPs of all nodes joined to the weave network
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These two variables are used to connect a new node to the weave network. The new node needs to know the firsts nodes (seed) and the list of IPs of all nodes.
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To reset these variables and reset the weave network set them to `uninitialized`
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