How to fix MOVED slot_id node_address in Redis

const Redis = require("ioredis");
const cluster = new Redis.Cluster([
  { host: "node1.example.com", port: 6379 },
  { host: "node2.example.com", port: 6379 },
  { host: "node3.example.com", port: 6379 }
]);

await cluster.set("mykey", "value");

from redis.cluster import RedisCluster

rc = RedisCluster(
    startup_nodes=[{"host": "node1.example.com", "port": 6379}],
    decode_responses=True
)
rc.set("mykey", "value")

HostAndPort hp = new HostAndPort("node1.example.com", 6379);
JedisCluster jedisCluster = new JedisCluster(hp);
jedisCluster.set("mykey", "value");

rdb := redis.NewClusterClient(&redis.ClusterOptions{
    Addrs: []string{
        "node1.example.com:6379",
        "node2.example.com:6379",
        "node3.example.com:6379",
    },
})
rdb.Set(ctx, "mykey", "value", 0)

var options = ConfigurationOptions.Parse("node1.example.com:6379,node2.example.com:6379,node3.example.com:6379");
var connection = ConnectionMultiplexer.Connect(options);
var db = connection.GetDatabase();
db.StringSet("mykey", "value");

# WRONG - will produce MOVED errors:
redis-cli -h node1.example.com -p 6379

# CORRECT - enables cluster support:
redis-cli -c -h node1.example.com -p 6379

# Enable cluster mode:
redis-benchmark -c -h node1.example.com -p 6379 -n 10000

# Verify the cluster is healthy and all nodes are reachable:
redis-cli -c cluster nodes

# Output should show all master nodes with their slot ranges:
# 6379d1f37a77f68b7d5a2eb22cb8adb1d25cae2f node1.example.com:6379@16379 myself,master - 0 0 1 connected 0-5460
# 2a2ecc9e9f97ca9adb0cb98c9d72a9e98e6ac62f node2.example.com:6379@16379 master - 0 1639486400000 2 connected 5461-10922
# 8de1dd82f99c1cffd6ae842a2e9d6b31d8f91df9 node3.example.com:6379@16379 master - 0 1639486400000 3 connected 10923-16383

# Reinitialize the cluster on every MOVED error:
rc = RedisCluster(
    startup_nodes=[{"host": "node1.example.com", "port": 6379}],
    reinitialize_steps=1  # Forces full cluster refresh on MOVED
)

# Or manually refresh:
rc.cluster_slots()

cluster.flushAll()
  .then(() => cluster.reset(false))  // Reset without closing connection
  .then(() => cluster.info('replication'))

# Check cluster status:
redis-cli -c cluster info

# Output should show "cluster_state:ok"
# If it shows "cluster_state:fail", investigate which nodes are down:
redis-cli -c cluster nodes

# Look for nodes marked as "fail" or "disconnected"
# Reconnect failed nodes or remove them from the cluster

# Check the error log on affected nodes:
tail -50 /var/log/redis/redis-server.log

# If a node is permanently down, remove it:
redis-cli -c cluster forget <node-id>

# If a node is hung, restart it:
sudo systemctl restart redis-server

# Wait for the cluster to stabilize (30+ seconds):
watch -n1 "redis-cli -c cluster info | grep cluster_state"