apache - Docker 消息:由于服务器/代理的响应不正确，自动禁用 Acquire::http::Pipeline-Depth

Question

将 apache2 安装到 Docker 的 Ubuntu 16.04 镜像中，我收到以下消息

W: http://archive.ubuntu.com/ubuntu/pool/main/g/gdbm/libgdbm3_1.8.3-13.1_amd64.deb: Automatically disabled Acquire::http::Pipeline-Depth due to incorrect response from server/proxy. (man 5 apt.conf).

那是 Dockerfile:

FROM ubuntu:16.04

#RUN apt-get update
#https://github.com/phusion/baseimage-docker/issues/319
RUN apt-get update && apt-get install -y --no-install-recommends apt-utils 
RUN apt-get install -y apache2

当我打开图像时，我看到 /var/www/html文件夹，意思是安装了apache。

那是什么讯息？这是一个错误还是我可以认为 apache 已完全安装？

Answer 1

流水线是 HTTP/1.1 协议(protocol)的一个特性。来自 RFC 7230 :

A client that supports persistent connections MAY "pipeline" itsrequests (i.e., send multiple requests without waiting for eachresponse). A server MAY process a sequence of pipelined requests inparallel if they all have safe methods (Section 4.2.1 of [RFC7231]),but it MUST send the corresponding responses in the same order thatthe requests were received.

可以通过设置 Acquire::http::Pipeline-Depth 在 apt 中激活此功能。来自 man apt.conf :

The setting Acquire::http::Pipeline-Depth can be used to enable HTTP pipelining (RFC 2616 section 8.1.2.2) which can be beneficial e.g. on high-latency connections. It specifies how many requests are sent in a pipeline. APT tries to detect and workaround misbehaving webservers and proxies at runtime, but if you know that yours does not conform to the HTTP/1.1 specification pipelining can be disabled by setting the value to 0. It is enabled by default with the value 10.

您看到的消息意味着您与 apt 存储库的连接不支持流水线，(可能是由于某种代理)并且此功能已被 apt 自动禁用。安装可能需要更多时间，但 您可以考虑完全安装您的 apache 服务器 .