How to fix ERR Write commands are not allowed from read-only scripts in Redis

-- Example problematic script with EVAL_RO
EVAL_RO "redis.call('SET', KEYS[1], ARGV[1]); return redis.call('GET', KEYS[1])" 1 mykey myvalue
-- Error: ERR Write commands are not allowed from read-only scripts

# Wrong - using EVAL_RO with write commands
redis-cli EVAL_RO "redis.call('SET', 'counter', 1)" 0

# Correct - using EVAL for write operations
redis-cli EVAL "redis.call('SET', 'counter', 1)" 0

// Node.js with ioredis
// Wrong
await redis.eval_ro("redis.call('INCR', KEYS[1])", 1, 'mycounter');

// Correct
await redis.eval("redis.call('INCR', KEYS[1])", 1, 'mycounter');

-- Read-only script - safe for EVAL_RO
local value = redis.call('GET', KEYS[1])
local count = redis.call('HLEN', KEYS[2])
return {value, count}

redis-cli EVAL_RO "local value = redis.call('GET', KEYS[1]); return value" 1 mykey

#!lua flags=no-writes
return redis.call('GET', KEYS[1])

// Node.js configuration
const Redis = require('ioredis');

// Wrong - trying writes on replica
const replica = new Redis({
  host: 'replica.redis.example.com',
  port: 6379
});

// Correct - use master for writes
const master = new Redis({
  host: 'master.redis.example.com',
  port: 6379
});

await master.eval("redis.call('SET', KEYS[1], ARGV[1])", 1, 'mykey', 'myvalue');

# Check current user permissions
ACL WHOAMI
ACL GETUSER myuser

# Create user with script write permissions
ACL SETUSER scriptuser on >password ~* +@all +eval

# Or specifically allow write commands needed
ACL SETUSER scriptuser on >password ~* +eval +set +del +incr