FIX: Redis may not be availiable on Redis initializer (discourse#15955)

README.md

@@ -32,7 +32,7 @@ To get your environment setup, follow the community setup guide for your operati
 
 If you're familiar with how Rails works and are comfortable setting up your own environment, you can also try out the [**Discourse Advanced Developer Guide**](docs/DEVELOPER-ADVANCED.md), which is aimed primarily at Ubuntu and macOS environments.
 
-Before you get started, ensure you have the following minimum versions: [Ruby 2.7+](https://www.ruby-lang.org/en/downloads/), [PostgreSQL 13+](https://www.postgresql.org/download/), [Redis 6.0+](https://redis.io/download). If you're having trouble, please see our [**TROUBLESHOOTING GUIDE**](docs/TROUBLESHOOTING.md) first!
+Before you get started, ensure you have the following minimum versions: [Ruby 2.7+](https://www.ruby-lang.org/en/downloads/), [PostgreSQL 13+](https://www.postgresql.org/download/), [Redis 6.2+](https://redis.io/download). If you're having trouble, please see our [**TROUBLESHOOTING GUIDE**](docs/TROUBLESHOOTING.md) first!
 
 ## Setting up Discourse
 

config/initializers/001-redis.rb

@@ -9,7 +9,11 @@
 # upgrade to Sidekiq 6.1
 Redis.exists_returns_integer = true
 
-if Gem::Version.new(Discourse.redis.info['redis_version']) < Gem::Version.new("6.2.0")
-  STDERR.puts "Discourse requires Redis 6.2.0 or up"
-  exit 1
+begin
+  if Gem::Version.new(Discourse.redis.info['redis_version']) < Gem::Version.new("6.2.0")
+    STDERR.puts "Discourse requires Redis 6.2.0 or up"
+    exit 1
+  end
+rescue Redis::CannotConnectError
+  STDERR.puts "Couldn't connect to Redis"
 end