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+---
+title: "Migration KV Store to Memberlist"
+linkTitle: "Migration KV Store to Memberlist"
+weight: 10
+slug: migration-kv-store-to-memberlist
+---
+
+This guide explains how to perform a live migration of the Cortex Key-Value (KV) Store from an external backend (such as Consul or Etcd) to Memberlist.
+
+## Context
+
+When deployed as microservices, Cortex relies on a KV Store to discover other Cortex components and manage ring topologies.
+
+To reduce external dependencies and simplify operations, you may want to migrate your existing KV store to Memberlist, a built-in gossip protocol implementation.
+
+## Step-by-step Migration Process
+
+We can leverage the [multi KV Store](https://cortexmetrics.io/docs/configuration/arguments/#multi-kv) feature to achieve a live migration.
+
+### Set Memberlist as the Secondary KV Store
+
+In this example, we will walk through migrating from Consul to Memberlist.
+
+Using the Multi KV Store feature, you will designate your existing KV store (Consul) as the `primary` and Memberlist as the `secondary`. By setting `mirror_enabled: true`, Cortex will automatically replicate all data written to the primary store into the secondary store.
+
+Update your configuration file and deploy the changes:
+
+```yaml
+ring:
+  store: memberlist
+memberlist:
+  abort_if_join_fails: false
+  bind_port: <gossip-ring-port>
+  join_members:
+    - gossip-ring.<namespace>.svc.cluster.local:<gossip-ring-port>
+...
+ingester:
+  lifecycler:
+    join_after: 60s
+    heartbeat_period: 5s
+    ring:
+      kvstore:
+        store: multi
+        multi:
+          mirror_enabled: true
+          primary: consul
+          secondary: memberlist
+        consul:
+          host: <consul-host>:<consul-port>
+...
+```
+> **Why `join_after: 60s`?**
+>
+> The Memberlist gossip protocol requires a bit of time to propagate the state across the cluster. Setting a 60-second delay ensures that the ingester has enough time to fully sync the existing ring topology from other peers before actively joining and receiving traffic.
+>
+> **Note:** Make sure to apply this multi KV store configuration to all other components that interact with the ring (e.g. distributors, store-gateways), not just the ingesters.
+
+Once deployed, Cortex will begin mirroring primary (Consul) data to Memberlist.
+
+### Verify Data Mirroring
+
+You can verify that data is safely replicating to the secondary store by monitoring the following metrics:
+
+- `cortex_multikv_mirror_enabled`: Indicates whether data mirroring is currently active (a value of `1` means active).
+- `cortex_multikv_mirror_writes_total`: The total number of successful write operations replicated to the secondary store.
+- `cortex_multikv_mirror_write_errors_total`: The total number of failed write operations to the secondary store.
+
+**Validation Check:**
+1. Check that the `cortex_multikv_mirror_enabled` metric is exposing a value of `1`.
+2. Monitor the write rate using a query like `rate(cortex_multikv_mirror_writes_total[5m])`. This rate should remain stable.
+3. Ensure that `cortex_multikv_mirror_write_errors_total` is not increasing.
+
+If these conditions are met, you can safely assume that the primary data is being successfully mirrored to Memberlist.
+
+### Set Memberlist as the Sole KV Store
+
+Once the data migration is verified and stable, you can finalize the migration by configuring Memberlist as the primary and only KV store.
+
+```yaml
+ingester:
+  lifecycler:
+    join_after: 60s
+    heartbeat_period: 5s
+    ring:
+      kvstore:
+        store: memberlist
+```
+> **Note:** Again, ensure this update is applied across all components.
+
+After the updated configuration is fully deployed across your cluster and everything is running stably, you can remove your Consul cluster.
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