Setting the REDIS_URL variable

[jdeel]

I am new to Redis and I want to install it in a Ubuntu machine for Sidekiq.
In the redis-rb GitHub official page it is written that Redis with a default configuration is listening on localhost, port 6379.
Shall I assume that the REDIS_URL variable is by default already set to redis://localhost:6379 ?
Or, if I wish to use the REDIS_URL variable, am I supposed to do set it explicitly?

$ export REDIS_URL = redis://localhost:6379

I can only guess that setting the REDIS_URL variable has only sense if it is necessary to change the default configuration.
However I could not find documentation about it and the redis.conf files in the documentation do not contain any entry for REDIS_URL.

[Jan-Erik Rediger]

By default REDIS_URL is unset.
If no configuration is specified explicitely (either through passing
arguments or by setting the environment variable), redis-rb will use
localhost and port 6379.

If that's where your redis server is running, you don't need to set it
explicitely.

On Fri, Dec 02, 2016 at 04:21:25AM -0800, jdeel wrote:
> I am new to Redis and I want to install it in a Ubuntu machine for Sidekiq.

> In the redis-rb GitHub official page <https://github.com/redis/redis-rb> it

> is written that Redis with a default configuration is listening on localhost,
> port 6379.
> Shall I assume that the REDIS_URL variable is by default already set to
> redis://localhost:6379 ?
> Or, if I wish to use the REDIS_URL variable, am I supposed to do set it
> explicitly?
>
> $ export REDIS_URL = redis://localhost:6379
>
> I can only guess that setting the REDIS_URL variable has only sense if it
> is necessary to change the default configuration.
> However I could not find documentation about it and the redis.conf files in
> the documentation do not contain any entry for REDIS_URL.
>

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[jdeel]

Thanks janerik!

[jdeel]

In the default redis.conf the number of databases is set to 16, and the default database is DB 0.
Some documentation says that it is not uncommon to use different Redis databases for development and for tests.
I am wondering whether would it be convenient to use REDIS_URL for such purposes as setting DB 1 for tests and leaving DB 0 for development.
If I set REDIS_URL = redis://localhost:6379/1 and fetch REDIS_URL inside tests would DB 1 be used only in test environment or also in development?
In other words setting REDIS_URL is useful when REDIS_URL needs to be used and explicitly called (as inside tests) or would affect server configuration?

[方垚]

URI syntax

Redis Standalone

redis://[password@]host [: port][/database][? [timeout=timeout[d|h|m|s|ms|us|ns]] [ &database=database] [&clientName=clientName]]

Redis Standalone (SSL)

rediss://[password@]host [: port][/database][? [timeout=timeout[d|h|m|s|ms|us|ns]] [ &database=database] [&clientName=clientName]]

Redis Standalone (Unix Domain Sockets)

redis-socket:// [password@]path[ ?[timeout=timeout[d|h|m|s|ms|us|ns]][&database=database] [&clientName=clientName]]

Redis Sentinel

redis-sentinel://[password@]host1 [: port1][, host2 [:port2]][, hostN [:portN]][/ database][? [timeout=timeout[d|h|m|s|ms|us|ns]] [ &sentinelMasterId=sentinelMasterId] [&database=database] [&clientName=clientName]]

I hope this can help