dns | 易学教程

解决Couldn't resolve host 'mirrorlist.centos.org

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这个错误引起主要是因为环境读取不到yun引起的可以考虑/etc/sysconfig/network-scripts/ifcfg-eth0 配置出错导致网络不通。或者/etc/resolv.conf的DNS配置出错。或者可以考虑清楚yum缓存影响（yum clean all） vi /etc/resolv.conf nameserver 202.106.0.20（今天又出现此错误，这个nameserver加进去就好了。记得配置静态ip的话DNS也需要加入然后update yum试试成功就OK了）（下面是网上找到比较有用资料）今天在linux环境通过yum安装软件报了以下错误： [root@multi-mysql yum.repos.d] # yum install ncurses devel -y Loaded plugins: fastestmirror, security Loading mirror speeds from cached hostfile Could not retrieve mirrorlist http: //mirrorlist .centos.org/?release=6&arch=x86_64&repo=os error was 14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist

nodemailer在Linux服务器上dns无法解析域名

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报错如下： { Error: queryA ETIMEOUT smtp.qq.com at QueryReqWrap.onresolve [as oncomplete] (dns.js:201:19) errno: 'ETIMEOUT', code: 'EDNS', syscall: 'queryA', hostname: 'smtp.qq.com', command: 'CONN' } 即配置了hosts将smtp.qq.com域名指向一个IP地址，还是无法解析。通过使用dns.lookup进行域名解析，发现又能正常解析，猜想是不是nodemailer域名解析与当前dns版本不匹配导致，通过跟踪代码发现在node_modules/nodemailer/lib/shared/index.js文件中其在调用发送邮件使用的dns解析如下： dns['resolve' + family](hostname, (err, addresses) => { if (err) { switch (err.code) { case dns.NODATA: case dns.NOTFOUND: case dns.NOTIMP: case dns.SERVFAIL: case dns.CONNREFUSED: case 'EAI_AGAIN': return callback(null, []);

Getting DNS resolution time and response time with Python

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问题 Does PycURL or any other python pakcage provides information about : lookup connection time I would like to get the same information as this cURL command does (without calling the command using subprocess): Command curl -s -w '\nLookup time:\t%{time_namelookup}\nConnect time:\t%{time_connect}\nPreXfer time:\t%{time_pretransfer}\nStartXfer time:\t%{time_starttransfer}\n\nTotal time:\t%{time_total}\n' -o /dev/null http://stackoverflow.com/ Output: Lookup time: 0.029 Connect time: 0.144 PreXfer

Centos 7.4 DNS域名解析

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1、安装部署包 yum -y install bind bind-utils bind-chroot 2、启动服务并设置开机自启动 [root@localhost ~]# systemctl start named.service [root@localhost ~]# systemctl enable named Created symlink from /etc/systemd/system/multi-user.target.wants/named.service to /usr/lib/systemd/system/named.service. 3、查看服务是否启动成功 [root@localhost ~]# ps -ef|grep named [root@localhost ~]# netstat -anntup|grep 53 4、修改主配置文件 vim /etc/named.conf ... 将下行中的127.0.0.1修改为any，代表允许监听任何IP地址 ------------------------------修改前： options { listen-on port 53 { 127.0.0.1; }; #修改 listen-on-v6 port 53 { ::1; };#修改 directory "/var/named"; dump-file "/var

Whitelist Domain Authentication Laravel

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问题 I'm looking for the best way to only allow certain domains to access my laravel application. I'm currently using Laravel 5.1 and am using a Middleware to redirect if the referring domain isn't located in the whitelisted domains. class Whitelist { /** * Handle an incoming request. * * @param \Illuminate\Http\Request $request * @param \Closure $next * @return mixed */ public function handle($request, Closure $next) { //requesting URL $referer = Request::server('HTTP_REFERER'); //parse url to

Heroku domain registration configured to bamboo on a cedar stack

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问题 I have a DNS config issue with Heroku while running on the Cedar Stack. It keeps thinking I'm routing my Cedar stack to Bamboo when my custom domains have the correct pointing CNAME records and are properly configured to Heroku instruction. Here's what happened: I recently created a heroku app in the past week with a cedar stack. Region: United States Stack: Cedar Framework: Ruby/Rails And I used NameCheap to register my domain and pointed it to the CNAME record. Host Name | IP Address/URL |

tcpdump-抓包工具-Linux

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环境：VMware-Workstation-12-Pro，Windows-10，CentOS-6.9-x86_64，Xshell5 基本介绍 tcpdump是Linux自带的抓包工具，可以详细看到计算机通信中详细报文内容，如果读者熟悉另一款强大的抓包工具wireshark，tcpdump相当于是wireshark的命令行版本。dump这个单词有垃圾堆，倒垃圾的意思，在计算机英语中的含义是转存。 tcpdump官网：http://www.tcpdump.org/ This is the official web site of tcpdump, a powerful command-line packet analyzer; 查看本机tcpdump的版本 [root@as4k html]# tcpdump --version tcpdump version 4.1-PRE-CVS_2017_03_21 tcpdump的最新版本 Version: 4.9.2 Release Date: September 3, 2017 官方文档：http://www.tcpdump.org/manpages/tcpdump.1.html，此文档无疑是全网最详细，最权威的教程，很多大牛的博客都有借鉴此文的内容。这是什么鬼 TCPDUMP(8) TCPDUMP(8) NAME tcpdump -

CDN是什么与CDN加速的原理

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CDN是什么 CDN全称:Content Delivery Network或Content Ddistribute Network，即内容分发网络 CDN设计思路避让：尽可能避开互联网上有可能影响数据传输速度和稳定性的瓶颈和环节，使内容传输的更快、更稳定。检测：通过在网络各处放置节点服务器所构成的在现有的互联网基础之上的一层智能虚拟网络，CDN系统能够实时监测网络流量和各节点的连接、负载状况以及到用户的距离和响应时间等综合信息将用户的请求分发：根据监测情况重新导向离用户最近的服务节点上 CDN应用场景　　解决因分布、带宽、服务器性能带来的访问延迟问题，适用于站点加速、点播、直播等场景。使用户可就近取得所需内容，解决 Internet网络拥挤的状况，提高用户访问网站的响应速度和成功率。　　控制时延无疑是现代信息科技的重要指标，CDN的意图就是尽可能的减少资源在转发、传输、链路抖动等情况下顺利保障信息的连贯性。CDN所有的工作最后都是落在控制上面，所以CDN就像是网络中的CPU。示例说明：在网速一定的前提下，CDN就像网络中快递员小哥 &amp;lt;img src="https://pic2.zhimg.com/v2-35eeda954a433e794e89b012dfad7231_b.jpg" data-caption="" data-size="normal

Session is specific to what? Why not treat ip and domain name session as same?

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问题 I want to know session is specific with what? This is not restrict to one language. Bellow is just use php as an example. I use php session, it works well when I use the my website domain name. To test the website in my local vmvare ubuntu on the windows OS, I change the hosts of my windows to make the DNS to my local ip. When testing local, I use domain name, it also works well. But when I change the url in the browser to Ip, the session is lost. You may confuse why I do this, because I want

DNS同步的辅DNS上，log中报告tsig verify failure

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问题配置了DNS同步的辅DNS，不能接受主DNS的同步信息。Log中报告tsig verify failure 解决方案查看/var/log/message，内有如下提示信息： Mar 28 16:20:19 localhost named[19698]: client 218.7.120.95#32772: request has invalid signature: tsig verify failure 原因是主辅DNS时间不同步。解决方案： 1) 时间改成一样的。 2) 执行touch / 3) 重新启动ACA 3) 到主dns上，运行/usr/prima/sbin/syncDNS -a使得辅DNS被同步。来源： https://www.cnblogs.com/sfqas/p/12181794.html

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