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 pingyou should get back
PONGthat indicates redis is up and running.
1What 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.
0redis-cli -h host_url -p 6379 pingAll 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.
1you 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
}
