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Be more explicit about rolling upgrade process

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Paul Banks 2018-10-11 11:44:20 +01:00
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website/source/docs/upgrading.html.md
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@ -31,7 +31,9 @@ Consul is A, and version B is released.
2. On each server, install version B of Consul. 2. On each server, install version B of Consul.
3. Shut down version A, restart with version B. 3. One server at a time, shut down version A, restart with version B. Wait until
the server is healthy and has rejoined the cluster before moving on to the
next server.
4. Once all the servers are upgraded, begin a rollout of clients following 4. Once all the servers are upgraded, begin a rollout of clients following
the same process. the same process.
@ -52,12 +54,15 @@ version B comes out.
1. On each node, install version B of Consul. 1. On each node, install version B of Consul.
2. Shut down version A, and start version B with the `-protocol=PREVIOUS` 2. One server at a time, shut down version A, and start version B with the
flag, where "PREVIOUS" is the protocol version of version A (which can `-protocol=PREVIOUS` flag, where "PREVIOUS" is the protocol version of
be discovered by running `consul -v` or `consul members`). version A (which can be discovered by running `consul -v` or `consul
members`). Wait until the server is healthy and has rejoined the cluster
before moving on to the next server.
3. Once all nodes are running version B, go through every node and restart 3. Once all nodes are running version B, go through every node and restart the
the version B agent _without_ the `-protocol` flag. version B agent _without_ the `-protocol` flag, again wait for each server to
rejoin the cluster before continuing.
4. Done! You're now running the latest Consul agent speaking the latest protocol. 4. Done! You're now running the latest Consul agent speaking the latest protocol.
You can verify this is the case by running `consul members` to You can verify this is the case by running `consul members` to