varnish-redis

access Redis servers from VCL

Description

VMOD using the synchronous hiredis library API to access Redis servers from VCL.

Highlights:

* Full support for execution of Lua scripts (i.e. EVAL command), including

optimistic automatic execution of EVALSHA commands.

* All Redis reply data types are supported, including partial support to

access to components of simple (i.e. not nested) array replies.

* Redis pipelines are not (and won't be) supported. Lua scripting, which is

fully supported by the VMOD, it's a much more flexible alternative to

pipelines for atomic execution and minimizing latency. Pipelines are hard

to use and error prone, specially when using the WATCH command.

* Support for classic Redis deployments using multiple replicated Redis

servers and for clustered deployments based on Redis Cluster.

* Support for multiple databases and multiple Redis connections, local to

each Varnish worker thread, or shared using one or more pools.

* Support for smart command execution, selecting the destination server

according with the preferred role (i.e. master or slave) and with distance

and healthiness metrics collected during execution.

* Support for Redis Sentinel, allowing automatic discovery of sick / healthy

servers and changes in their roles.

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