小编ela*_*sta的帖子

我正在尝试编写一个基于 Twisted 的模拟 DNS 服务器来进行一些测试。

从本指南中汲取灵感，我编写了一个非常简单的服务器，它可以将所有内容解析为127.0.0.1：

from twisted.internet import defer, reactor
from twisted.names import dns, error, server


class MockDNSResolver:

    def _doDynamicResponse(self, query):
        name = query.name.name
        record = dns.Record_A(address=b"127.0.0.1")
        answer = dns.RRHeader(name=name, payload=record)
        authority = []
        additional = []
        return [answer], authority, additional

    def query(self, query, timeout=None):
        print("Incoming query for:", query.name)
        if query.type == dns.A:
            return defer.succeed(self._doDynamicResponse(query))
        else:
            return defer.fail(error.DomainError())


if __name__ == "__main__":
    clients = [MockDNSResolver()]
    factory = server.DNSServerFactory(clients=clients)
    protocol = dns.DNSDatagramProtocol(controller=factory)
    reactor.listenUDP(10053, protocol)
    reactor.listenTCP(10053, factory) …

正如标题所说，我无法以非 root 用户身份在 Docker 容器内以无头模式运行 Firefox。考虑以下 Dockerfile，构建于docker build -t firefox .

FROM python:3.8-buster
RUN apt-get update -qq \
    && apt-get install -qy \
        libappindicator1 \
        libasound2 \
        libatk1.0-0 \
        libc6 \
        libcairo2 \
        libcups2 \
        libdbus-1-3 \
        libexpat1 \
        libfontconfig1 \
        libgbm-dev \
        libgcc1 \
        libgconf-2-4 \
        libgdk-pixbuf2.0-0 \
        libglib2.0-0 \
        libgtk-3-0 \
        libnspr4 \
        libnss3 \
        libpango-1.0-0 \
        libpangocairo-1.0-0 \
        libpci-dev \
        libstdc++6 \
        libx11-6 \
        libx11-xcb1 \
        libxcb1 \
        libxcomposite1 \
        libxcursor1 \
        libxdamage1 \
        libxext6 \ …