Comments (11)
@eoranged The lua-resty-redis library is based on ngx_lua's cosocket API, which is a parallel implementation to the ngx_http_upstream thing in the nginx core. You can do everything you did with ngx_redis2 + upstream {...} in Lua with lua-resty-redis but you cannot mix these two like accessing upstream {...} entries from within lua-resty-redis.
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It is sad, but I got It.
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@eoranged why do you still want to keep using your upstream {...} blocks?
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@agentzh As I have already mentioned in the question, http_upstream_module provides load-balancing and handles backend fails.
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@eoranged You can easily implement failover and load balancing yourself with a little bit of Lua if you're using lua-resty-redis. Also you have much more flexibility here.
See also https://github.com/agentzh/lua-resty-redis#load-balancing-and-failover
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Any existing code for reference? whether lua or not.
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I've done a very basic redis load balancer module: https://gist.github.com/wonderbeyond/11a20570bb5b1b1bf818bf03e527faf6
I just select the next server from a given list circularly.
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hmm is the above example correct ? is that counter shared across all workers / sessions ?
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I have used it in production until now.
The counter is shared in one single worker.
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yep makes sense. just read the docs. thanks for sharing.
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However, I think we need a more powerful balancer module.
e.g. We can report failure of one redis node to the balancer, the balancer will not select it for a period of time.
Are you interesting?
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Related Issues (20)
- SSL not working
- The performance of redis pipeline mode is unstable HOT 3
- CLIENT SETNAME?
- redis:get(key) question HOT 2
- opm package outdated HOT 1
- Connection pool not creating HOT 2
- How to create a single redis connection HOT 5
- this support two-way authentication?
- Add keepalive for redis client to make the connections reliable
- Nginx 1.24 HOT 2
- Nginx creates more connection than poolsize, backlog to redis HOT 5
- lua tcp socket read timed out, context: ssl_certificate_by_lua*, client: 172.69.58.204, server: 0.0.0.0:443 HOT 2
- redis set_keepalive doesn't work HOT 1
- lua entry thread aborted: runtime error: /usr/local/openresty/lualib/resty/redis.lua:357: bad request HOT 2
- no request found HOT 1
- Add the host:port to the error message
- Reading from client: error:0A000126:SSL routines::unexpected eof while reading
- red:smembers("key"), sometime not include the new member? HOT 6
- [Feature Request] Pipeline coroutine safety HOT 6
- Redis: timeout HOT 5
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