Sentinel Example

[rsidhaarth]

Hi,

Is it possible for you to add sentinel example in readme as I could not able to get it work.

Thanks

[rsidhaarth]

`vcl 4.1;

import redis;

backend default {
.host = "127.0.0.1";
.port = "8080";
}

sub vcl_init {
redis.sentinels(
locations="10.10.20.41:26379,10.10.20.42:26379,10.10.20.43:26379",
period=60,
connection_timeout=500
);

new db = redis.db(
    location="mymaster",
    type=auto,
    connection_timeout=500,
    shared_connections=true,
    max_connections=128
);

}

sub vcl_recv {
redis.use("db");

if (req.http.X-Redis-Key) {
    set req.http.redis-key = req.http.X-Redis-Key;
} else {
    set req.http.redis-key = "failover-test-key";
}

db.command("SET");
db.push(req.http.redis-key);
db.push("Test value from Varnish Redis Sentinel failover check");
db.execute(true);

db.command("GET");
db.push(req.http.redis-key);
db.execute(false);
set req.http.redis-value = db.get_string_reply();

return (synth(200, "Redis Sentinel Failover Test OK"));

}

sub vcl_synth {
set resp.http.X-Redis-Key = req.http.redis-key;
set resp.http.X-Redis-Value = req.http.redis-value;
set resp.http.X-Redis-Stats = db.stats();
}
`

We could not able to set key, can you help in this?

[carlosabalde]

Hi @rsidhaarth! It looks like you're assuming using Sentinel you can auto-discover master and slave instances, but that's not how the VMOD works (see #38). The VMOD integrates with Redis Sentinel it order to find the new master when a failover occurs, but that's all. The list of Redis Server instances needs to be explicitly specified. I hope this helps! 🙂