From f6910a1b470d87963266dfb4a5c6739f66d1d4a9 Mon Sep 17 00:00:00 2001
From: chhanz <41337266+chhanz@users.noreply.github.com>
Date: Thu, 16 Apr 2026 00:54:34 +0000
Subject: [PATCH] fix: improve SEO and sitemap issues - canonical, robots.txt,
 structured data

Resolve Google Search Console sitemap detection failure and traffic decline:
- Add canonical URL tag (head.html)
- Change robots.txt to block only /assets/images/ instead of entire /assets/ (allow CSS/JS crawling)
- Exclude 404 page from sitemap (sitemap: false)
- Add noindex meta tag for pagination pages
- Exclude tag pages from sitemap and add noindex
- Fix DHCP post malformed URL (category: linux, dhcp -> categories: [linux, dhcp])
- Fix og:image fallback bug (page.image -> meta_image)
- Add BlogPosting/WebSite JSON-LD structured data

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 404.html                                |  1 +
 _config.yml                             |  1 +
 _includes/head.html                     |  8 +++++-
 _layouts/home.html                      | 13 ++++++++++
 _layouts/post.html                      | 34 +++++++++++++++++++++++++
 _layouts/tag.html                       |  1 +
 _posts/2020-11-17-configuration-dhcp.md |  2 +-
 robots.txt                              |  2 +-
 8 files changed, 59 insertions(+), 3 deletions(-)

diff --git a/404.html b/404.html
index c472b4e..eaf2115 100644
--- a/404.html
+++ b/404.html
@@ -1,5 +1,6 @@
 ---
 layout: default
+sitemap: false
 ---
 
 <style type="text/css" media="screen">
diff --git a/_config.yml b/_config.yml
index e5be1c2..c01bcf7 100644
--- a/_config.yml
+++ b/_config.yml
@@ -61,6 +61,7 @@ defaults:
       type: tags
     values:
       layout: tag
+      sitemap: false
 
 exclude: [README.md, Gemfile, Gemfile.lock]
 
diff --git a/_includes/head.html b/_includes/head.html
index e33d088..400e8fb 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -23,6 +23,12 @@
 {% unless meta_image contains '://' %}
 {% assign meta_image = meta_image | prepend: site.url %}
 {% endunless %}
+<link rel="canonical" href="{{ meta_url }}" />
+{% if paginator and paginator.page > 1 %}
+<meta name="robots" content="noindex, follow" />
+{% elsif page.noindex %}
+<meta name="robots" content="noindex, follow" />
+{% endif %}
 <title>{{ meta_title }}</title>
 <meta name="title" content="{{ meta_title }}" />
 <meta name="author" content="{{ meta_author }}"/>
@@ -35,7 +41,7 @@
 <meta property="og:title" content="{{ meta_title }}"/>
 <meta property="og:description" content="{{ meta_description }}"/>
 <meta property="og:url" content="{{ meta_url }}"/>
-<meta property="og:image" content="{{ page.image }}"/>
+<meta property="og:image" content="{{ meta_image }}"/>
 <meta name="twitter:card" content="summary_large_image"/>
 <meta name="twitter:title" content="{{ meta_title }}"/>
 <meta name="twitter:description" content="{{ meta_description }}"/>
diff --git a/_layouts/home.html b/_layouts/home.html
index 8c75157..665ff5b 100644
--- a/_layouts/home.html
+++ b/_layouts/home.html
@@ -1,6 +1,19 @@
 ---
 layout: default
 ---
+<script type="application/ld+json">
+{
+  "@context": "https://schema.org",
+  "@type": "WebSite",
+  "name": {{ site.title | jsonify }},
+  "url": "{{ site.url }}",
+  "description": {{ site.description | strip_html | strip_newlines | jsonify }},
+  "author": {
+    "@type": "Person",
+    "name": {{ site.author | jsonify }}
+  }
+}
+</script>
 <div id="cover" class="container"
     {% if site.image %}style="background-image:url({{ site.image }});"{% endif %}>
     <div>
diff --git a/_layouts/post.html b/_layouts/post.html
index ec34812..109f797 100644
--- a/_layouts/post.html
+++ b/_layouts/post.html
@@ -1,6 +1,40 @@
 ---
 layout: default
 ---
+{% assign author = site.authors | where: 'name', page.author | first %}
+{% assign post_image = page.image | default: site.image %}
+{% unless post_image contains '://' %}{% assign post_image = post_image | prepend: site.url %}{% endunless %}
+<script type="application/ld+json">
+{
+  "@context": "https://schema.org",
+  "@type": "BlogPosting",
+  "headline": {{ page.title | jsonify }},
+  "description": {{ page.excerpt | strip_html | truncatewords: 75 | jsonify }},
+  "image": {{ post_image | jsonify }},
+  "datePublished": "{{ page.date | date_to_xmlschema }}",
+  {% if page.modified %}"dateModified": "{{ page.modified }}",{% endif %}
+  "author": {
+    "@type": "Person",
+    "name": {{ page.author | default: site.author | jsonify }},
+    "url": "{{ site.url }}{{ author.url }}"
+  },
+  "publisher": {
+    "@type": "Organization",
+    "name": {{ site.title | jsonify }},
+    "logo": {
+      "@type": "ImageObject",
+      "url": "{{ site.url }}/assets/favicon.png"
+    }
+  },
+  "mainEntityOfPage": {
+    "@type": "WebPage",
+    "@id": "{{ site.url }}{{ page.url }}"
+  }
+  {% if page.tags %},
+  "keywords": {{ page.tags | jsonify }}
+  {% endif %}
+}
+</script>
 <div id="fb-root"></div>
 <div id="navbar" class="container">
     <h5><a id="link-back" href="/">Back to Posts</a></h5>
diff --git a/_layouts/tag.html b/_layouts/tag.html
index 204e1f0..b6ef4b6 100644
--- a/_layouts/tag.html
+++ b/_layouts/tag.html
@@ -1,5 +1,6 @@
 ---
 layout: default
+noindex: true
 ---
 <div id="navbar" class="container">
     <h5><a id="link-back" href="/">Main</a></h5>
diff --git a/_posts/2020-11-17-configuration-dhcp.md b/_posts/2020-11-17-configuration-dhcp.md
index 1394566..ff31c50 100644
--- a/_posts/2020-11-17-configuration-dhcp.md
+++ b/_posts/2020-11-17-configuration-dhcp.md
@@ -5,7 +5,7 @@ description: " "
 author: chhanz
 date: 2020-11-17
 tags: [linux]
-category: linux, dhcp
+categories: [linux, dhcp]
 ---
    
 # DHCP 란?
diff --git a/robots.txt b/robots.txt
index 2dfef2f..dc0a4a8 100644
--- a/robots.txt
+++ b/robots.txt
@@ -1,5 +1,5 @@
 User-agent: *
 Allow: /
-Disallow: /assets/
+Disallow: /assets/images/
 
 Sitemap: https://tech.chhanz.xyz/sitemap.xml