Docker 从另一个容器连接到 redis 容器时为什么报错 Name or service not known?

Question

redisConnectOptions

const redisConnectOptions: RedisConnectOptions = {
    hostname: "redis://redis-stack",
    port: 6379,
};

docker-compose.yml

redis-stack:
    image: redis/redis-stack:latest
    container_name: redis-stack
    ports:
      - "6379:6379"
      - "6380:8001"
    networks:
      - my-network

docker log

2024-05-19 18:53:04 error: Uncaught (in promise) Error: failed to lookup address information: Name or service not known
2024-05-19 18:53:04         : await Deno.connect(dialOpts);
2024-05-19 18:53:04           ^
2024-05-19 18:53:04     at async Object.connect (ext:deno_net/01_net.js:587:55)
2024-05-19 18:53:04     at async RedisConnection.#connect (https://deno.land/x/redis@v0.32.0/connection.ts:190:11)
2024-05-19 18:53:04     at async RedisConnection.#connect (https://deno.land/x/redis@v0.32.0/connection.ts:222:7)
2024-05-19 18:53:04     at async RedisConnection.#connect (https://deno.land/x/redis@v0.32.0/connection.ts:222:7)
2024-05-19 18:53:04     at async RedisConnection.#connect (https://deno.land/x/redis@v0.32.0/connection.ts:222:7)
2024-05-19 18:53:04     at async RedisConnection.#connect (https://deno.land/x/redis@v0.32.0/connection.ts:222:7)
2024-05-19 18:53:04     at async RedisConnection.#connect (https://deno.land/x/redis@v0.32.0/connection.ts:222:7)
2024-05-19 18:53:04     at async RedisConnection.#connect (https://deno.land/x/redis@v0.32.0/connection.ts:222:7)
2024-05-19 18:53:04     at async RedisConnection.#connect (https://deno.land/x/redis@v0.32.0/connection.ts:222:7)
2024-05-19 18:53:04     at async RedisConnection.#connect (https://deno.land/x/redis@v0.32.0/connection.ts:222:7)

Answer 1

错误信息表明在尝试连接到名为 redis://redis-stack 的 Redis 服务器时发生了 DNS 解析错误，即“Name or service not known”。这通常意味着客户端无法将主机名 redis://redis-stack 解析为 IP 地址。

问题出在 redisConnectOptions 的 hostname 字段上。hostname 应该只包含 Redis 服务器的名称或 IP 地址，而不是包含协议前缀（如 redis://）。

修改后的 redisConnectOptions 应该是这样的：

const redisConnectOptions: RedisConnectOptions = {
    hostname: "redis-stack", // 移除 "redis://" 前缀
    port: 6379,
};

Answer 2

const redisConnectOptions: RedisConnectOptions = {
    hostname: "127.0.0.1",
    port: 6379,
};