CGSpace Notes

Documenting day-to-day work on the CGSpace repository.

November, 2018

by Alan Orth in  

2018-11-01

  • Finalize AReS Phase I and Phase II ToRs
  • Send a note about my dspace-statistics-api to the dspace-tech mailing list

2018-11-03

  • Linode has been sending mails a few times a day recently that CGSpace (linode18) has had high CPU usage
  • Today these are the top 10 IPs:

# zcat --force /var/log/nginx/*.log /var/log/nginx/*.log.1 | grep -E "03/Nov/2018" | awk '{print $1}' | sort | uniq -c | sort -n | tail -n 10
   1300 66.249.64.63
   1384 35.237.175.180
   1430 138.201.52.218
   1455 207.46.13.156
   1500 40.77.167.175
   1979 50.116.102.77
   2790 66.249.64.61
   3367 84.38.130.177
   4537 70.32.83.92
  22508 66.249.64.59
  • The 66.249.64.x are definitely Google
  • 70.32.83.92 is well known, probably CCAFS or something, as it’s only a few thousand requests and always to REST API
  • 84.38.130.177 is some new IP in Latvia that is only hitting the XMLUI, using the following user agent:
Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/14.0.792.0 Safari/535.1
  • They at least seem to be re-using their Tomcat sessions:
$ grep -c -E 'session_id=[A-Z0-9]{32}:ip_addr=84.38.130.177' dspace.log.2018-11-03 | sort | uniq
342
  • 50.116.102.77 is also a regular REST API user
  • 40.77.167.175 and 207.46.13.156 seem to be Bing
  • 138.201.52.218 seems to be on Hetzner in Germany, but is using this user agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:62.0) Gecko/20100101 Firefox/62.0
  • And it doesn’t seem they are re-using their Tomcat sessions:
$ grep -c -E 'session_id=[A-Z0-9]{32}:ip_addr=138.201.52.218' dspace.log.2018-11-03 | sort | uniq
1243
  • Ah, we’ve apparently seen this server exactly a year ago in 2017-11, making 40,000 requests in one day…
  • I wonder if it’s worth adding them to the list of bots in the nginx config?
  • Linode sent a mail that CGSpace (linode18) is using high outgoing bandwidth
  • Looking at the nginx logs again I see the following top ten IPs:
# zcat --force /var/log/nginx/*.log /var/log/nginx/*.log.1 | grep -E "03/Nov/2018" | awk '{print $1}' | sort | uniq -c | sort -n | tail -n 10
   1979 50.116.102.77
   1980 35.237.175.180
   2186 207.46.13.156
   2208 40.77.167.175
   2843 66.249.64.63
   4220 84.38.130.177
   4537 70.32.83.92
   5593 66.249.64.61
  12557 78.46.89.18
  32152 66.249.64.59
  • 78.46.89.18 is new since I last checked a few hours ago, and it’s from Hetzner with the following user agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:62.0) Gecko/20100101 Firefox/62.0
  • It’s making lots of requests and using quite a number of Tomcat sessions:
$ grep -c -E 'session_id=[A-Z0-9]{32}:ip_addr=78.46.89.18' /home/cgspace.cgiar.org/log/dspace.log.2018-11-03 | sort | uniq
8449
  • I could add this IP to the list of bot IPs in nginx, but it seems like a futile effort when some new IP could come along and do the same thing
  • Perhaps I should think about adding rate limits to dynamic pages like /discover and /browse
  • I think it’s reasonable for a human to click one of those links five or ten times a minute…
  • To contrast, 78.46.89.18 made about 300 requests per minute for a few hours today:
# grep 78.46.89.18 /var/log/nginx/access.log | grep -o -E '03/Nov/2018:[0-9][0-9]:[0-9][0-9]' | sort | uniq -c | sort -n | tail -n 20
    286 03/Nov/2018:18:02
    287 03/Nov/2018:18:21
    289 03/Nov/2018:18:23
    291 03/Nov/2018:18:27
    293 03/Nov/2018:18:34
    300 03/Nov/2018:17:58
    300 03/Nov/2018:18:22
    300 03/Nov/2018:18:32
    304 03/Nov/2018:18:12
    305 03/Nov/2018:18:13
    305 03/Nov/2018:18:24
    312 03/Nov/2018:18:39
    322 03/Nov/2018:18:17
    326 03/Nov/2018:18:38
    327 03/Nov/2018:18:16
    330 03/Nov/2018:17:57
    332 03/Nov/2018:18:19
    336 03/Nov/2018:17:56
    340 03/Nov/2018:18:14
    341 03/Nov/2018:18:18
  • If they want to download all our metadata and PDFs they should use an API rather than scraping the XMLUI
  • I will add them to the list of bot IPs in nginx for now and think about enforcing rate limits in XMLUI later
  • Also, this is the third (?) time a mysterious IP in Hetzner has done this… who is this?