没有连接处于活动状态/可用于服务此操作：HMGET /api/v1/students；导师-helper.redis.cache.windows.net 上的 UnableToConnect:6380答案

【问题标题】：No connection is active/available to service this operation: HMGET /api/v1/students; UnableToConnect on tutor-helper.redis.cache.windows.net:6380没有连接处于活动状态/可用于服务此操作：HMGET /api/v1/students；导师-helper.redis.cache.windows.net 上的 UnableToConnect:6380
【发布时间】：2021-12-09 14:56:28
【问题描述】：

我正在尝试连接到 Azure Redis 缓存。我正在使用 .net 6 并使用 StackExchangeRedis 缓存响应，它在 localhost 中有效，但在部署中不起作用，请帮助我.... 我也在许多论坛中找到了答案，但不起作用

Error when deploy

我的 Redis 代码配置

应用程序.json

"RedisCacheSetting": {
    "Enabled": true,
    "ConnectionString": "tutor-helper.redis.cache.windows.net:6380,password=*****PuCERKKnrcbff0y3hWpZ***m1BaY40=,ssl=True,abortConnect=False"
  },

缓存属性

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
    public class CachedAttribute : Attribute, IAsyncActionFilter
    {
        private readonly int _timeToLiveSeconds;

        public CachedAttribute(int timeToLiveSeconds)
        {
            _timeToLiveSeconds = timeToLiveSeconds;
        }

        public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
        {
            var cacheSetting = context.HttpContext.RequestServices.GetRequiredService<RedisCacheSetting>();

            if (!cacheSetting.Enabled)
            {
                await next();
                return;
            }
            var cacheService = context.HttpContext.RequestServices.GetRequiredService<IResponseCacheService>();
            var cacheKey = GenerateKeyFromRequest(context.HttpContext.Request);

            var cacheResponse = await cacheService.GetCacheResponseAsync(cacheKey);

            if (!string.IsNullOrEmpty(cacheResponse))
            {
                var rs = new ContentResult
                {
                    Content = cacheResponse,
                    ContentType = "application/json",
                    StatusCode = 200,
                };

                context.Result = rs;

                return;
            }

            var executedContext = await next();

            if (executedContext.Result is ObjectResult okObjectResult)
            {
                await cacheService.CacheResponseAsync(cacheKey, okObjectResult.Value, TimeSpan.FromSeconds(_timeToLiveSeconds));
            }
        }

        private static string GenerateKeyFromRequest(HttpRequest request)
        {
            var keyBuilder = new StringBuilder();
            keyBuilder.Append($"{request.Path}");

            foreach (var (key, value) in request.Query.OrderBy(x => x.Key))
            {
                keyBuilder.Append($"|{key}-{value}");
            }

            return keyBuilder.ToString();
        }
    }

startup.cs 中的配置

 public static void SetUpCache(this IServiceCollection services, IConfiguration configuration)
        {
            var redisCache = new RedisCacheSetting();
            configuration.GetSection(nameof(RedisCacheSetting)).Bind(redisCache);
            services.AddSingleton(redisCache);

            //services.Configure<RedisCacheSetting>(configuration.GetSection("RedisCacheSetting"));

            //services.AddDistributedRedisCache(op => op.Configuration = redisCache.ConnectionString);
            services.AddStackExchangeRedisCache(op => op.Configuration = redisCache.ConnectionString);
            services.AddSingleton<IResponseCacheService, ResponseCacheService>();
        }

【问题讨论】：

标签： asp.net stackexchange.redis azure-redis-cache

【解决方案1】：

这是一个简单的 tcping 到端点的输出：

tcpingutor-helper.redis.cache.windows.net 6380
探测 52.163.188.36:6380/tcp - 无响应 - 时间=2021.946ms
探测 52.163.188.36:6380/tcp - 无响应 - 时间=2013.493ms
探测 52.163.188.36:6380/tcp - 无响应 - 时间=2014.854ms
探测 52.163.188.36:6380/tcp - 无响应 - time=2006.678ms

因此，DNS 名称解析为真实 IP 地址，但端点不接受连接。

如果我猜的话，我会说您在阻止连接的 redis 实例上设置了防火墙规则？

【讨论】：