# rpc错误：代码=不可用 描述=所有子连接都处于瞬态故障状态，最新连接错误：连接错误：描述="传输：拨号时出错：拨号tcp 10.0.0.1:8080：输入/输出超时"

- **ID:** `go/grpc-unavailable-load-balancer-fail`
- **领域:** go
- **类别:** network_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

负载均衡器后面的所有后端服务器都不可达，通常是由于网络分区或服务器崩溃。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 1.0 | active | — | — |
| 1.1 | active | — | — |

## 解决方案

1. **Check the health of all backend servers and ensure they are reachable.** (90% 成功率)
   ```
   Use curl or telnet to test connectivity: telnet 10.0.0.1 8080, and check server logs.
   ```
2. **Implement a fallback to a different load balancer or DNS resolver.** (80% 成功率)
   ```
   resolver := resolver.NewBuilder("dns:///example.com:8080")
conn, err := grpc.Dial("dns:///example.com:8080", grpc.WithInsecure(), grpc.WithResolvers(resolver))
   ```

## 无效尝试

- **Restart the client application.** — The client is fine; the issue is with the servers or network. (95% 失败率)
- **Increase the dial timeout to a very high value.** — If servers are down, longer timeout just delays the error. (80% 失败率)