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There are several ways to find out whether a Redis node is a **master** or a **replica**:

### 1. Via the `INFO replication` command

This is the main and most reliable way.

**Example:**

```bash
redis-cli INFO replication
```

**Output:**

```javascript
# Replication
role:master
connected_slaves:1
slave0:ip=127.0.0.1,port=6380,state=online,offset=1203,lag=0
```

```javascript
# Replication
role:slave
master_host:127.0.0.1
master_port:6379
master_link_status:up
```

The `role:` field shows what this node is:

- `role:master`, this is the **primary node**.
- `role:slave` (or `role:replica` in newer versions), this is a **replica**.

### 2. Via the `ROLE` command

A more concise alternative.

**Example:**

```bash
redis-cli ROLE
```

**Possible responses:**

- For a master:

```javascript
  1) "master"
  2) (integer) 12345
  3) (array) ...
  ```
- For a replica:

```javascript
  1) "slave"
  2) "127.0.0.1"
  3) (integer) 6379
  4) "connected"
  5) (integer) 12345
  ```

### 3. Via Redis Sentinel (if it's in use)

If you have Sentinel configured:

```bash
redis-cli -p 26379 SENTINEL masters
```

This shows the current master and its replicas.

**In short:**
→ The fastest way is `redis-cli INFO replication` and checking the `role:` field.

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