How to check whether the Redis server is running?

If it's not running, I want to fallback to using the database.

I'm using the FuelPHP framework, so I'm open to a solution based on this, or just standard PHP.

6 Answers

You can use command line to determine if redis is running:

redis-cli ping

you should get back

PONG

that indicates redis is up and running.

1

What you can do is try to get an instance (\Redis::instance()) and work with it like this:

try
{ $redis = \Redis::instance(); // Do something with Redis.
}
catch(\RedisException $e)
{ // Fall back to other db usage.
}

But preferably you'd know whether redis is running or not. This is just the way to detect it on the fly.

0

redis-cli -h host_url -p 6379 ping

All answers are great,

aAnother way can be to check if default REDIS port is listening

i.e port number 6379lsof -i:6379

if you don't get any output for above command then it implies redis is not running.

1

you can do it by this way.

$redis = new Redis();
$redis->connect('127.0.0.1', 6379);
echo $redis->ping();

and then check if it print +PONG, which show redis-server is running.

This is for those running Node-Redis.

const redis = require('redis');
const REDIS_PORT = process.env.REDIS_PORT || 6379
const client = redis.createClient(REDIS_PORT)
const connectRedis = async () => { await client.PING().then( async () => { // what to run if the PING is successful, which also means the server is up. console.log("server is running...") }, async () => { // what to run if the PING is unsuccessful, which also means the server is down. console.log("server is not running, trying to connect...") client.on('error', (err) => console.log('Redis Client Error', err)); await client.connect(); })
return
}

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