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Update chapter about custom domain setting #21

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Update chapter about custom domain setting #21

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14 changes: 10 additions & 4 deletions 03-project-hosting/050-homepage.rst
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Expand Up @@ -277,11 +277,17 @@ GitHub 为每一个用户分配了一个二级域名\ ``<user-id>.github.io``\

参见： https://github.com/gotgit/gotgit.github.io/blob/master/CNAME
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这个地址无效，可能是上次批量替换时的错误。

https://github.com/gotgit/gotgit.github.com/blob/master/CNAME


2. 然后更改域名\ ``www.worldhello.net``\ 的IP地址，指向域名\ ``gotgit.github.io``\
对应的IP地址（注意不是\ ``github.com``\ 的IP地址）。
2. 转到域名提供商的配置页面，设置二级域名\ ``worldhello.net``\跳转到三级域名\ ``www.worldhello.net``\。
DNS修改生效时间最长可能需要一天。
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实际上 worldhello.net 的二级域名也直接别名指向 gotgit.github.io

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恩，www.worldhello.net和worldhello.net都指向gotgit.github.io。你原文中写的是指向\ gotgit.github.io\对应的IP地址，我试过这样设置可以成功，但是github官方文档里没说可以这样设置。可能出现的问题是，github分配的域名\ gotgit.github.io\是固定的，但是这个域名对应的IP地址是可能会变的，所以不能直接指向IP地址。


完成域名的DNS指向后，可试着用\ ``ping``\ 或\ ``dig``\ 命令确认域名\
``www.worldhello.net``\ 和\ ``gotgit.github.io``\ 指向同一IP地址。
3. 在域名提供商的配置页面，创建CNAME记录，使子域名\ ``www``\指向\ ``gotgit.github.io``\。
DNS修改生效时间最长可能需要一天。

4. 在域名提供商的配置页面，创建两条A记录，分别解析为IP地址\ ``192.30.252.153``\和\ ``192.30.252.154``\。
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设置两条 A 记录没有必要

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设置两条A记录是github帮助页面写的，我不是很清楚这样设置的原因。可能是互为备份吧。

DNS修改生效时间最长可能需要一天。

完成域名的DNS指向后，可试着用\ ``ping``\ 或\ ``dig``\ 命令确认域名\ ``www.worldhello.net``\
和\ ``gotgit.github.io``\ 指向同一IP地址。

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ping 命令确认IP指向一致。dig 命令诊断域名解析方式。

$ dig www.worldhello.net

; <<>> DiG 9.8.3-P1 <<>> www.worldhello.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16993
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.worldhello.net.            IN      A

;; ANSWER SECTION:
www.worldhello.net.     3600    IN      CNAME   gotgit.github.io.
gotgit.github.io.       3600    IN      CNAME   github.map.fastly.net.
github.map.fastly.net.  30      IN      A       103.245.222.133

::

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