From b4a49d0186a89c7a524e5463f4df492956a78d1d Mon Sep 17 00:00:00 2001
From: Alan Orth <alan.orth@gmail.com>
Date: Sat, 25 Nov 2017 10:39:20 +0200
Subject: [PATCH] Add notes for 2017-11-24

---
 content/post/2017-11.md                       |  21 +++++++++++
 public/2017-11/index.html                     |  34 ++++++++++++++++--
 public/2017/11/postgres-connections-month.png | Bin 0 -> 9506 bytes
 public/2017/11/postgres-connections-week.png  | Bin 0 -> 8356 bytes
 public/sitemap.xml                            |  10 +++---
 static/2017/11/postgres-connections-month.png | Bin 0 -> 9506 bytes
 static/2017/11/postgres-connections-week.png  | Bin 0 -> 8356 bytes
 7 files changed, 57 insertions(+), 8 deletions(-)
 create mode 100644 public/2017/11/postgres-connections-month.png
 create mode 100644 public/2017/11/postgres-connections-week.png
 create mode 100644 static/2017/11/postgres-connections-month.png
 create mode 100644 static/2017/11/postgres-connections-week.png

diff --git a/content/post/2017-11.md b/content/post/2017-11.md
index 6f17dfbe1..1ec7f75c8 100644
--- a/content/post/2017-11.md
+++ b/content/post/2017-11.md
@@ -830,3 +830,24 @@ $ grep 70.32.83.92 dspace.log.2017-11-23 | grep -o -E 'session_id=[A-Z0-9]{32}'
 - I came across some interesting PostgreSQL tuning advice for SSDs: https://amplitude.engineering/how-a-single-postgresql-config-change-improved-slow-query-performance-by-50x-85593b8991b0
 - Apparently setting `random_page_cost` to 1 is "common" advice for systems running PostgreSQL on SSD (the default is 4)
 - So I deployed this on DSpace Test and will check the Munin PostgreSQL graphs in a few days to see if anything changes
+
+## 2017-11-24
+
+- It's too early to tell for sure, but after I made the `random_page_cost` change on DSpace Test's PostgreSQL yesterday the number of connections dropped drastically:
+
+![PostgreSQL connections after tweak (week)](/cgspace-notes/2017/11/postgres-connections-week.png)
+
+- There have been other temporary drops before, but if I look at the past month and actually the whole year, the trend is that connections are four or five times higher on average:
+
+![PostgreSQL connections after tweak (month)](/cgspace-notes/2017/11/postgres-connections-month.png)
+
+- I just realized that we're not logging access requests to other vhosts on CGSpace, so it's possible I have no idea that we're getting slammed at 4AM on another domain that we're just silently redirecting to cgspace.cgiar.org
+- I've enabled logging on the CGIAR Library on CGSpace so I can check to see if there are many requests there
+- In just a few seconds I already see a dozen requests from Googlebot (of course they get HTTP 301 redirects to cgspace.cgiar.org)
+- I also noticed that CGNET appears to be monitoring the old domain every few minutes:
+
+```
+192.156.137.184 - - [24/Nov/2017:20:33:58 +0000] "HEAD / HTTP/1.1" 301 0 "-" "curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.27.1 zlib/1.2.3 libidn/1.18 libssh2/1.4.2"
+```
+
+- I should probably tell CGIAR people to have CGNET stop that
diff --git a/public/2017-11/index.html b/public/2017-11/index.html
index 681673dd8..e8a86b33c 100644
--- a/public/2017-11/index.html
+++ b/public/2017-11/index.html
@@ -38,7 +38,7 @@ COPY 54701
 
 <meta property="article:published_time" content="2017-11-02T09:37:54&#43;02:00"/>
 
-<meta property="article:modified_time" content="2017-11-23T17:18:45&#43;02:00"/>
+<meta property="article:modified_time" content="2017-11-24T00:59:11&#43;02:00"/>
 
 
 
@@ -86,9 +86,9 @@ COPY 54701
   "@type": "BlogPosting",
   "headline": "November, 2017",
   "url": "https://alanorth.github.io/cgspace-notes/2017-11/",
-  "wordCount": "4849",
+  "wordCount": "5032",
   "datePublished": "2017-11-02T09:37:54&#43;02:00",
-  "dateModified": "2017-11-23T17:18:45&#43;02:00",
+  "dateModified": "2017-11-24T00:59:11&#43;02:00",
   "author": {
     "@type": "Person",
     "name": "Alan Orth"
@@ -1080,6 +1080,34 @@ $ grep -c com.atmire.utils.UpdateSolrStatsMetadata dspace.log.2017-11-19
 <li>So I deployed this on DSpace Test and will check the Munin PostgreSQL graphs in a few days to see if anything changes</li>
 </ul>
 
+<h2 id="2017-11-24">2017-11-24</h2>
+
+<ul>
+<li>It&rsquo;s too early to tell for sure, but after I made the <code>random_page_cost</code> change on DSpace Test&rsquo;s PostgreSQL yesterday the number of connections dropped drastically:</li>
+</ul>
+
+<p><img src="/cgspace-notes/2017/11/postgres-connections-week.png" alt="PostgreSQL connections after tweak (week)" /></p>
+
+<ul>
+<li>There have been other temporary drops before, but if I look at the past month and actually the whole year, the trend is that connections are four or five times higher on average:</li>
+</ul>
+
+<p><img src="/cgspace-notes/2017/11/postgres-connections-month.png" alt="PostgreSQL connections after tweak (month)" /></p>
+
+<ul>
+<li>I just realized that we&rsquo;re not logging access requests to other vhosts on CGSpace, so it&rsquo;s possible I have no idea that we&rsquo;re getting slammed at 4AM on another domain that we&rsquo;re just silently redirecting to cgspace.cgiar.org</li>
+<li>I&rsquo;ve enabled logging on the CGIAR Library on CGSpace so I can check to see if there are many requests there</li>
+<li>In just a few seconds I already see a dozen requests from Googlebot (of course they get HTTP 301 redirects to cgspace.cgiar.org)</li>
+<li>I also noticed that CGNET appears to be monitoring the old domain every few minutes:</li>
+</ul>
+
+<pre><code>192.156.137.184 - - [24/Nov/2017:20:33:58 +0000] &quot;HEAD / HTTP/1.1&quot; 301 0 &quot;-&quot; &quot;curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.27.1 zlib/1.2.3 libidn/1.18 libssh2/1.4.2&quot;
+</code></pre>
+
+<ul>
+<li>I should probably tell CGIAR people to have CGNET stop that</li>
+</ul>
+
   
 
   
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diff --git a/public/sitemap.xml b/public/sitemap.xml
index 6e9e92e54..b4e557a80 100644
--- a/public/sitemap.xml
+++ b/public/sitemap.xml
@@ -4,7 +4,7 @@
   
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-    <lastmod>2017-11-23T17:18:45+02:00</lastmod>
+    <lastmod>2017-11-24T00:59:11+02:00</lastmod>
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-    <lastmod>2017-11-23T17:18:45+02:00</lastmod>
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