micahlee/etcd_heartbeat.md

Created October 18, 2019 21:04

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ETCD Heartbeat Update Procedure

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etcd_heartbeat.md

ETCD Heartbeat Update Procedure

Stop Cluster Service

On each Standby:
```
sv stop cluster
```
On the Master:
```
sv stop cluster
```

Stop ETCD

On each Standby:
```
sv stop etcd
```
On the Master:
```
sv stop etcd
```

Modify ETCD Config

On the Master and each Standby:

Open the etcd config file:
```
nano /etc/etcd/etcd.config
```
Modify the two existing lines to your new values (in milliseconds):
```
ETCD_HEARTBEAT_INTERVAL=4000
ETCD_ELECTION_TIMEOUT=20000
```
Add a new line:
```
ETCD_SNAPSHOT_COUNT=5000
```

Restart ETCD

On the Master:
```
sv start etcd
```
On each Standby:
```
sv start etcd
```
Verify cluster health on the Master:

If etcd is not healthy before restarting the DAP cluster service, then the master will failover immediately upon starting the cluster service.
```
$ etcdctl cluster-health
...
cluster is healthy
```

Restart Cluster Service

On the Master:
```
sv start cluster
```
On each Standby:
```
sv start cluster
```

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