patroni and etcd restart after configuration changes

Hello Team, Currently we are using single node etcd in our patroni. Tomorrow morning we are going to made it 3 etcd node cluster. But we don’t want loose the data in postgresql.

I have few question so i can make changes easily : 1 First of all we need to create 3 etcd node, we want to use existing etcd node also then we need to create 2 more etcd node. Now we need to remove the data directory from existing etcd node or it will join the cluster and need to restart etcd service or reload will work on all 3 etcd node? 2. Now we will make change in patroni.yml file also From

etcd
     host: etcd:2379

To

etcd:
      hosts: etcd1:2379,etcd2:2379,etcd3:2379

Now we need to restart the patroni or reload will work?

Please help me so we can do it with minimum downtime or no downtime.

Thanks.

[vitabaks]

Because when slave node lag then it not sync with master and we us reinit for base backup then both node sync again.

This information is not enough to give you recommendations. If a similar problem occurs again, I suggest you open a new issue and describe the problem in detail, and attach logs.

Please suggest we will restart our patroni service if required after making changes in dcs part. We need to use below variable and setting all 3 etcd node or over 2 node which join the cluster later:

There is no need to restart the patroni service.

If you see any wrong config in my patroni.yml file

I do not see a problem in what you showed.

Now all 3 node joined the cluster.

Good! As I understand it, everything is working for you, and your main problem has been solved.

[vitabaks]

ETCD_INITIAL_CLUSTER=“etcd2=192.168.56.4:2380,etcd1=http://192.168.56.3:2380”

ETCD_INITIAL_CLUSTER="etcd2=http://192.168.56.4:2380,etcd1=http://192.168.56.3:2380"

http:// and you indicated ETCD_INITIAL_CLUSTER twice.

Try this configuration:

ETCD_NAME="etcd2"
ETCD_INITIAL_CLUSTER="etcd2=http://192.168.56.4:2380,etcd1=http://192.168.56.3:2380"
ETCD_LISTEN_PEER_URLS="http://192.168.56.4:2380,http://127.0.0.1:7001"
ETCD_LISTEN_CLIENT_URLS="http://127.0.0.1:2379, http://192.168.56.4:2379"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.56.4:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.56.4:2379"
ETCD_INITIAL_CLUSTER_TOKEN="cluster1"
ETCD_INITIAL_CLUSTER_STATE="existing"