How to test Redis connectivity

We first need to check if Redis DNS name resolves:

% nslookup redis.example.com

Server: 192.168.1.1

Address: 192.168.1.1#53

Non-authoritative answer:

redis.example.com canonical name = example-prod-redis-serverless-kg5o59.serverless.use2.cache.amazonaws.com.

example-prod-redis-serverless-kg5o59.serverless.use2.cache.amazonaws.com canonical name = default.example-prod-redis-serverless-kg5o59.serverless.use2.cache.amazonaws.com.

Name: default.example-prod-redis-serverless-kg5o59.serverless.use2.cache.amazonaws.com

Address: 10.0.3.74

...

Let's try to make a TCP connection:

% nc -vz redis.example.com 6379

nc: connectx to redis.example.com port 6379 (tcp) failed: Operation timed out

After adding remote client's IP address to inbound rules of Redis security group (firewall):

% nc -vz redis.example.com 6379

Connection to redis.example.com port 6379 [tcp/*] succeeded!

 

Let's now install Redis client so we can try to connect to the server:

% brew install redis

==> Fetching downloads for: redis

✔︎ Bottle Manifest redis (8.4.0)                                                                                                                                                            Downloaded   10.9KB/ 10.9KB

✔︎ Bottle Manifest ca-certificates (2025-12-02)                                                                                                                                             Downloaded    2.0KB/  2.0KB

✔︎ Bottle ca-certificates (2025-12-02)                                                                                                                                                      Downloaded  131.8KB/131.8KB

✔︎ Bottle redis (8.4.0)                                                                                                                                                                     Downloaded    1.2MB/  1.2MB

==> Installing redis dependency: ca-certificates

==> Pouring ca-certificates--2025-12-02.all.bottle.tar.gz

==> Regenerating CA certificate bundle from keychain, this may take a while...

🍺  /opt/homebrew/Cellar/ca-certificates/2025-12-02: 4 files, 236.4KB

==> Pouring redis--8.4.0.arm64_sequoia.bottle.tar.gz

==> Caveats

To start redis now and restart at login:

  brew services start redis

Or, if you don't want/need a background service you can just run:

  /opt/homebrew/opt/redis/bin/redis-server /opt/homebrew/etc/redis.conf

==> Summary

🍺  /opt/homebrew/Cellar/redis/8.4.0: 15 files, 3MB

==> Running `brew cleanup redis`...

...

==> Caveats

==> redis

To start redis now and restart at login:

  brew services start redis

Or, if you don't want/need a background service you can just run:

  /opt/homebrew/opt/redis/bin/redis-server /opt/homebrew/etc/redis.conf

Let's connect to Redis server and execute ping command (expected response is PONG) and also get some information about the server:

% redis-cli \       

  --tls \

  -h redis.example.com \

  -p 6379

redis.example.com:6379> ping

PONG

redis.example.com:6379> info server 

# Server

redis_version:7.1

redis_mode:cluster

os:Amazon ElastiCache

arch_bits:64

run_id:0

redis.example.com:6379> 

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