[SAC] [OSGeo] #2659: Upgrade nginx proxy servers on osgeo3, osgeo4, osgeo7 to Ubuntu 20.04, nginx 1.17+

[OSGeo]

#2659: Upgrade nginx proxy servers on osgeo3, osgeo4, osgeo7 to Ubuntu 20.04,
nginx 1.17+
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 Reporter:  robe           |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:  Sysadmin Contract 2021-II
Component:  Systems Admin  |   Keywords:
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 Per https://ubuntu.com/security/CVE-2019-20372

 we are running version 1.14 of nginx (released with Ubuntu 18.04)

 Need to upgrade to more easily mitigate
 https://ubuntu.com/security/CVE-2019-20372.

 Will test on osgeo4 first.

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2659>
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