Add section on advanced autopilot features to the guide
This commit is contained in:
parent
b7207b1733
commit
4f9a57cda3
|
@ -885,6 +885,9 @@ Consul will not enable TLS for the HTTP API unless the `https` port has been ass
|
|||
* <a name="server"></a><a href="#server">`server`</a> Equivalent to the
|
||||
[`-server` command-line flag](#_server).
|
||||
|
||||
* <a name="non_voting_server"></a><a href="#non_voting_server">`non_voting_server`</a> - Equivalent to the
|
||||
[`-non-voting-server` command-line flag](#_non_voting_server).
|
||||
|
||||
* <a name="server_name"></a><a href="#server_name">`server_name`</a> When provided, this overrides
|
||||
the [`node_name`](#_node) for the TLS certificate. It can be used to ensure that the certificate
|
||||
name matches the hostname we declare.
|
||||
|
|
|
@ -35,6 +35,8 @@ CleanupDeadServers = true
|
|||
LastContactThreshold = 200ms
|
||||
MaxTrailingLogs = 250
|
||||
ServerStabilizationTime = 10s
|
||||
RedundancyZoneTag = ""
|
||||
DisableUpgradeMigration = false
|
||||
|
||||
$ consul operator autopilot set-config -cleanup-dead-servers=false
|
||||
Configuration updated!
|
||||
|
@ -44,6 +46,8 @@ CleanupDeadServers = false
|
|||
LastContactThreshold = 200ms
|
||||
MaxTrailingLogs = 250
|
||||
ServerStabilizationTime = 10s
|
||||
RedundancyZoneTag = ""
|
||||
DisableUpgradeMigration = false
|
||||
```
|
||||
|
||||
## Dead Server Cleanup
|
||||
|
@ -87,22 +91,30 @@ $ curl localhost:8500/v1/operator/autopilot/health
|
|||
{
|
||||
"ID": "e349749b-3303-3ddf-959c-b5885a0e1f6e",
|
||||
"Name": "node1",
|
||||
"Address": "127.0.0.1:8300",
|
||||
"SerfStatus": "alive",
|
||||
"Version": "0.8.0",
|
||||
"Leader": true,
|
||||
"LastContact": "0s",
|
||||
"LastTerm": 3,
|
||||
"LastIndex": 23,
|
||||
"LastTerm": 2,
|
||||
"LastIndex": 10,
|
||||
"Healthy": true,
|
||||
"StableSince": "2017-03-10T22:01:14Z"
|
||||
"Voter": true,
|
||||
"StableSince": "2017-03-28T18:28:52Z"
|
||||
},
|
||||
{
|
||||
"ID": "099061c7-ea74-42d5-be04-a0ad74caaaf5",
|
||||
"ID": "e35bde83-4e9c-434f-a6ef-453f44ee21ea",
|
||||
"Name": "node2",
|
||||
"Address": "127.0.0.1:8705",
|
||||
"SerfStatus": "alive",
|
||||
"LastContact": "53.279635ms",
|
||||
"LastTerm": 3,
|
||||
"LastIndex": 23,
|
||||
"Version": "0.8.0",
|
||||
"Leader": false,
|
||||
"LastContact": "35.371007ms",
|
||||
"LastTerm": 2,
|
||||
"LastIndex": 10,
|
||||
"Healthy": true,
|
||||
"StableSince": "2017-03-10T22:03:26Z"
|
||||
"Voter": false,
|
||||
"StableSince": "2017-03-28T18:29:10Z"
|
||||
}
|
||||
]
|
||||
}
|
||||
|
@ -114,3 +126,57 @@ When a new server is added to the cluster, there is a waiting period where it
|
|||
must be healthy and stable for a certain amount of time before being promoted
|
||||
to a full, voting member. This can be configured via the `ServerStabilizationTime`
|
||||
setting.
|
||||
|
||||
---
|
||||
|
||||
~> The following Autopilot features are available only in
|
||||
[Consul Enterprise](https://www.hashicorp.com/consul.html) version 0.8.0 and later.
|
||||
|
||||
## Designated Non-voting Servers
|
||||
|
||||
With the [`-non-voting-server`](/docs/agent/options.html#_non_voting_server) option, a
|
||||
server can be explicitly marked as a non-voter and will never be promoted to a voting
|
||||
member. This can be useful when more read scaling is needed; being a non-voter means
|
||||
that the server will still have data replicated to it, but it will not be part of the
|
||||
quorum that the leader must wait for before committing log entries.
|
||||
|
||||
## Redundancy Zones
|
||||
|
||||
Prior to Autopilot, it was difficult to deploy servers in a way that took advantage of
|
||||
isolated failure domains such as AWS Availability Zones; users would be forced to either
|
||||
have an overly-large quorum (2-3 nodes per AZ) or give up redundancy within an AZ by
|
||||
deploying just one server in each.
|
||||
|
||||
If the `RedundancyZoneTag` setting is set, Consul will use its value to look for a
|
||||
zone in each server's specified [`-node-meta`](/docs/agent/options.html#_node_meta)
|
||||
tag. For example, if `RedundancyZoneTag` is set to `zone`, and `-node-meta zone:east1a`
|
||||
is used when starting a server, that server's redundancy zone will be `east1a`.
|
||||
|
||||
Consul will then use these values to partition the servers by redundancy zone, and will
|
||||
aim to keep one voting server per zone. Extra servers in each zone will stay as non-voters
|
||||
on standby to be promoted if the active voter leaves or dies.
|
||||
|
||||
## Upgrade Migrations
|
||||
|
||||
Autopilot in Consul Enterprise supports upgrade migrations by default. To disable this
|
||||
functionality, set `DisableUpgradeMigration` to true.
|
||||
|
||||
When a new server is added and Autopilot detects that its Consul version is newer than
|
||||
that of the existing servers, Autopilot will avoid promoting the new server until enough
|
||||
newer-versioned servers have been added to the cluster. When the count of new servers
|
||||
equals or exceeds that of the old servers, Autopilot will begin promoting the new servers
|
||||
to voters and demoting the old servers. After this is finished, the old servers can be
|
||||
safely removed from the cluster.
|
||||
|
||||
To check the consul version of the servers, either the [autopilot health]
|
||||
(/docs/agent/http/operator.html#autopilot-health) endpoint or the `consul members`
|
||||
command can be used:
|
||||
|
||||
```
|
||||
$ consul members
|
||||
Node Address Status Type Build Protocol DC
|
||||
node1 127.0.0.1:8301 alive server 0.7.5 2 dc1
|
||||
node2 127.0.0.1:8703 alive server 0.7.5 2 dc1
|
||||
node3 127.0.0.1:8803 alive server 0.7.5 2 dc1
|
||||
node4 127.0.0.1:8203 alive server 0.8.0 2 dc1
|
||||
```
|
||||
|
|
Loading…
Reference in New Issue