Change raft_protocol from 2 to 3 (Consul 1.0.0) without downtime?

[Edgaras Apšega]

Hello,

We're upgrading our Consul clusters from 0.9.2 to 1.0.0, and the default raft_protocol version 3 is causing downtime. But upgrading Consul server nodes one-by-one with "raft_protocol 2" is working perfectly fine. How to upgrade cluster to use v3 without downtime? Changing configuration to "raft_protocol 3" and pushing changes to one-by-one server nodes and restarting them doesn't help. All nodes are still using protocol 2.

[Preetha Appan]

Hi 

I suspect that you are running into https://github.com/hashicorp/consul/issues/3611 which is fixed and will be part of Consul 1.0.1. As a workaround, I would suggest upgrading to 1.0 leaving it at raft_protocol 2, and then doing a rolling upgrade to 1.0.1 with raft protocol 3 at the same time.

[Edgaras Apšega]

Hey,

I just did ant upgrade on one of my clusters with 2 datacenters with raft_protocol 3 option. What's interesting that there was a part of a second of a downtime while querying DNS interface when restarting the last node.

Anyway, `consul members -wan` command shows that the protocol version is till 2, but I started seeing `raft: Added peer 32ae761a-a85b-2608-4fc1-6a2976714b3a, starting replication` like messages in logs, so it means that the cluster is using protocol 3 now?

[Thomas]

Hi Edgaras,

You may want to use : consul operator raft list-peers

consul members displays the gossip protocol version in use - I think.

Thomas

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[Edgaras Apšega]

Thanks Thomas! I see that the RaftProtocol 3 is now in use.