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Add notes for 2017-11-23

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Alan Orth 2017-11-23 12:23:19 +02:00
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46
content/post/2017-11.md
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@ -780,3 +780,49 @@ $ grep -c com.atmire.utils.UpdateSolrStatsMetadata dspace.log.2017-11-19
- In other news, it looks like the JVM garbage collection pattern is back to its standard jigsaw pattern after switching back to CMS a few days ago:
![Tomcat JVM with CMS GC](/cgspace-notes/2017/11/tomcat-jvm-cms.png)
## 2017-11-23
- Linode alerted again that CPU usage was high on CGSpace from 4:13 to 6:13 AM
- I see a lot of Googlebot (66.249.66.90) in the XMLUI access logs
```
# cat /var/log/nginx/access.log /var/log/nginx/access.log.1 | grep -E "23/Nov/2017:0[456]" | awk '{print $1}' | sort -n | uniq -c | sort -h | tail
88 66.249.66.91
140 68.180.229.254
155 54.196.2.131
182 54.224.164.166
301 157.55.39.79
315 207.46.13.36
331 207.46.13.23
358 207.46.13.137
565 104.196.152.243
1570 66.249.66.90
```
- ... and the usual REST scrapers from CIAT (45.5.184.196) and CCAFS (70.32.83.92):
```
# cat /var/log/nginx/rest.log /var/log/nginx/rest.log.1 | grep -E "23/Nov/2017:0[456]" | awk '{print $1}' | sort -n | uniq -c | sort -h | tail
5 190.120.6.219
6 104.198.9.108
14 104.196.152.243
21 112.134.150.6
22 157.55.39.79
22 207.46.13.137
23 207.46.13.36
26 207.46.13.23
942 45.5.184.196
3995 70.32.83.92
```
- These IPs crawling the REST API don't specify user agents and I'd assume they are creating many Tomcat sessions
- I would catch them in nginx to assign a "bot" user agent to them so that the Tomcat Crawler Session Manager valve could deal with them, but they seem to create any really — at least not in the dspace.log:
```
$ grep 70.32.83.92 dspace.log.2017-11-23 | grep -o -E 'session_id=[A-Z0-9]{32}' | sort -n | uniq | wc -l
2
```
- I'm wondering if REST works differently, or just doesn't log these sessions?
- I wonder if they are measurable via JMX MBeans?

53
public/2017-11/index.html
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@ -86,7 +86,7 @@ COPY 54701
"@type": "BlogPosting",
"headline": "November, 2017",
"url": "https://alanorth.github.io/cgspace-notes/2017-11/",
"wordCount": "4549",
"wordCount": "4773",
"datePublished": "2017-11-02T09:37:54+02:00",
"dateModified": "2017-11-22T10:20:44+02:00",
"author": {
@ -1025,6 +1025,57 @@ $ grep -c com.atmire.utils.UpdateSolrStatsMetadata dspace.log.2017-11-19
<p><img src="/cgspace-notes/2017/11/tomcat-jvm-cms.png" alt="Tomcat JVM with CMS GC" /></p>
<h2 id="2017-11-23">2017-11-23</h2>
<ul>
<li>Linode alerted again that CPU usage was high on CGSpace from 4:13 to 6:13 AM</li>
<li>I see a lot of Googlebot (66.249.66.90) in the XMLUI access logs</li>
</ul>
<pre><code># cat /var/log/nginx/access.log /var/log/nginx/access.log.1 | grep -E &quot;23/Nov/2017:0[456]&quot; | awk '{print $1}' | sort -n | uniq -c | sort -h | tail
88 66.249.66.91
140 68.180.229.254
155 54.196.2.131
182 54.224.164.166
301 157.55.39.79
315 207.46.13.36
331 207.46.13.23
358 207.46.13.137
565 104.196.152.243
1570 66.249.66.90
</code></pre>
<ul>
<li>&hellip; and the usual REST scrapers from CIAT (45.5.184.196) and CCAFS (70.32.83.92):</li>
</ul>
<pre><code># cat /var/log/nginx/rest.log /var/log/nginx/rest.log.1 | grep -E &quot;23/Nov/2017:0[456]&quot; | awk '{print $1}' | sort -n | uniq -c | sort -h | tail
5 190.120.6.219
6 104.198.9.108
14 104.196.152.243
21 112.134.150.6
22 157.55.39.79
22 207.46.13.137
23 207.46.13.36
26 207.46.13.23
942 45.5.184.196
3995 70.32.83.92
</code></pre>
<ul>
<li>These IPs crawling the REST API don&rsquo;t specify user agents and I&rsquo;d assume they are creating many Tomcat sessions</li>
<li>I would catch them in nginx to assign a &ldquo;bot&rdquo; user agent to them so that the Tomcat Crawler Session Manager valve could deal with them, but they seem to create any really — at least not in the dspace.log:</li>
</ul>
<pre><code>$ grep 70.32.83.92 dspace.log.2017-11-23 | grep -o -E 'session_id=[A-Z0-9]{32}' | sort -n | uniq | wc -l
2
</code></pre>
<ul>
<li>I&rsquo;m wondering if REST works differently, or just doesn&rsquo;t log these sessions?</li>
<li>I wonder if they are measurable via JMX MBeans?</li>
</ul>