[ARVADOS] updated: 2.1.0-294-g7631343e1

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Summary of changes:

  discards  4091da044be3887c403d397eb331078a4ad4b33b (commit)
  discards  4fe66210fc0d20cceda33cfb954b5feaf3d19ba3 (commit)
       via  7631343e1bfafddca31b1ababbaa63c8a9aea1bb (commit)

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commit 7631343e1bfafddca31b1ababbaa63c8a9aea1bb
Author: Nico Cesar <nico at nicocesar.com>
Date:   Tue Jan 26 11:20:52 2021 -0500

    Doc update: Arvados 2.1 is not compatible with cgroups V2.
    
    Arvados-DCO-1.1-Signed-off-by: Nico Cesar <nico at curii.com>

diff --git a/doc/_includes/_install_compute_docker.liquid b/doc/_includes/_install_compute_docker.liquid
index fd5d88a9c..e3814b23c 100644
--- a/doc/_includes/_install_compute_docker.liquid
+++ b/doc/_includes/_install_compute_docker.liquid
@@ -10,18 +10,21 @@ Linux can report what compute resources are used by processes in a specific cgro
 
 To enable cgroups accounting, you must boot Linux with the command line parameters @cgroup_enable=memory swapaccount=1 at .
 
+Currently Arvados is not compatible with the new cgroups accounting, also known as cgroups v2. Currently, all supported GNU/Linux distributions don't use cgroups v2 as default
+If you are using a distribution in the compute nodes that ships with cgroups v2 enabled, make sure to disable it by booting Linux with the command line parameters @systemd.unified_cgroup_hierarchy=0 at .
+
 After making changes, reboot the system to make these changes effective.
 
 h3. Red Hat and CentOS
 
 <notextile>
-<pre><code>~$ <span class="userinput">sudo grubby --update-kernel=ALL --args='cgroup_enable=memory swapaccount=1'</span>
+<pre><code>~$ <span class="userinput">sudo grubby --update-kernel=ALL --args='cgroup_enable=memory swapaccount=1 systemd.unified_cgroup_hierarchy=0'</span>
 </code></pre>
 </notextile>
 
 h3. Debian and Ubuntu
 
-Open the file @/etc/default/grub@ in an editor.  Find where the string @GRUB_CMDLINE_LINUX@ is set.  Add @cgroup_enable=memory swapaccount=1@ to that string.  Save the file and exit the editor.  Then run:
+Open the file @/etc/default/grub@ in an editor.  Find where the string @GRUB_CMDLINE_LINUX@ is set.  Add @cgroup_enable=memory swapaccount=1 systemd.unified_cgroup_hierarchy=0@ to that string.  Save the file and exit the editor.  Then run:
 
 <notextile>
 <pre><code>~$ <span class="userinput">sudo update-grub</span>

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