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更新 Nginx/根据gpu使用率调度/获取redis中链接的lua脚本.md

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iProbe 2024-01-29 16:02:31 +08:00
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**lb.lua**
```lua
--[[
Created by: wangsuipeng
Edit: 20240125
Last Modify: 20240126
version: 1.1
Description:
脚本主要用于实现获取redis中的链接。
--]]
-- 参数配置
local redis_host = "60.204.148.84"
local redis_port = 6379
local redis_pwd = "xm!redis123"
local redis_db = 15
local redis_zset = "danceai"
local server_err_msg = "redis server error"
local redis = require("resty.redis")
-- 关闭redis连接
local function close_redis(red)
if (not red) then
return
end
--释放连接(连接池实现)
local pool_max_idle_time = 10000 --毫秒
local pool_size = 100 --连接池大小
local ok, err = red:set_keepalive(pool_max_idle_time, pool_size)
if (not ok) then
ngx.log(ngx.ERR, "set redis keepalive error : ", err)
return ngx.say(server_err_msg)
--ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR) -- 500
end
ngx.log(ngx.INFO,"close redis success")
end
-- 创建连接实例
local r = redis:new()
-- 超时时间
r:set_timeout(1000)
-- 连接redis
local ok, err = r:connect(redis_host, redis_port)
-- 判断是否连接成功
-- 若不成功,使用行配置的upstream
if (not ok) then
ngx.log(ngx.ERR, "connect redis error : ", err)
close_redis(r)
ngx.var.backend = "danceaiStream"
return
--ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR) -- 500
end
-- 验证
local rs,err = r:auth(redis_pwd)
if not rs then
ngx.log(ngx.ERR, "auth redis error : ", err)
ngx.var.backend = "danceaiStream"
return
--ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR) -- 500
end
-- 切换到相应db
r:select(redis_db)
-- 查询zset
local data,err = r:zrange(redis_zset,0,0)
-- 判断是否查询到
-- 若查询失败或结果为空,则使用自行配置的upstream
-- 否则,使用查询到的链接
if not data or #data == 0 then
ngx.log(ngx.WARN, "get backend error : ", err)
ngx.var.backend = "danceaiStream"
else
for _,backend in pairs(data) do
ngx.var.backend = backend
end
end
close_redis(r)
[root@ops lb]# vim lb.lua
[root@ops lb]# systemctl restart openresty
[root@ops lb]# cat lb.lua
--[[
Created by: wangsuipeng
Edit: 20240125
Last Modify: 20240126
version: 1.1
Description:
脚本主要用于实现获取redis中的链接。
--]]
-- 参数配置
-- 默认upstream
local default_backend = "danceaiStream"
-- redis
local redis_host = "60.204.148.84"
local redis_port = 6379
local redis_pwd = "xm!redis123"
local redis_db = 15
-- 需要获取的zset名称
local redis_zset = "danceai"
-- 连接池最大空闲时间
-- 单位为ms
local redis_pool_idle_time = 10000
-- 连接池大小
local redis_pool_size = 100
-- redis超时时间
-- 单位为ms
local redis_timeout =1000
local redis = require("resty.redis")
-- 关闭redis连接
local function close_redis(red)
if not red then
return
end
--释放连接(连接池实现)
local pool_max_idle_time = redis_pool_idle_time
local pool_size = redis_pool_size
local ok, err = red:set_keepalive(pool_max_idle_time, pool_size)
if not ok then
ngx.log(ngx.ERR, "set redis keepalive error : ", err)
return ngx.say("redis server error")
--ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR) -- 500
end
ngx.log(ngx.INFO,"close redis success")
end
-- 创建连接实例
local r = redis:new()
-- 超时时间
r:set_timeout(redis_timeout)
-- 连接redis
local ok, err = r:connect(redis_host, redis_port)
-- 判断是否连接成功
-- 若不成功,使用行配置的upstream
if not ok then
ngx.log(ngx.ERR, "connect redis error : ", err)
ngx.var.backend = default_backend
return
--ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR) -- 500
end
-- 验证
local rs,err = r:auth(redis_pwd)
if not rs then
ngx.log(ngx.ERR, "auth redis error : ", err)
ngx.var.backend = default_backend
return
--ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR) -- 500
end
-- 切换到相应db
r:select(redis_db)
-- 查询zset
local data,err = r:zrange(redis_zset,0,0)
-- 判断是否查询到
-- 若查询失败或结果为空,则使用自行配置的upstream
-- 否则,使用查询到的链接
if not data or #data == 0 then
ngx.log(ngx.WARN, "get backend error : ", err)
ngx.var.backend = default_backend
else
for _,backend in pairs(data) do
ngx.var.backend = backend
end
end
close_redis(r)
```