[ARVADOS] updated: 2.1.0-1166-g5bc8ad779

[Git user]

Summary of changes:
 doc/install/singularity.html.textile.liquid    | 2 +-
 doc/user/topics/arv-docker.html.textile.liquid | 8 +++++---
 2 files changed, 6 insertions(+), 4 deletions(-)

       via  5bc8ad779b8d39c63df88c20e5a883f4fe15c6da (commit)
      from  b74bc91079b0c2b5491e08f8ff677451c6d7e60e (commit)

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commit 5bc8ad779b8d39c63df88c20e5a883f4fe15c6da
Author: Tom Clegg <tom at curii.com>
Date:   Tue Aug 10 17:00:45 2021 -0400

    17726: Add Singularity info to user docs.
    
    Arvados-DCO-1.1-Signed-off-by: Tom Clegg <tom at curii.com>

diff --git a/doc/install/singularity.html.textile.liquid b/doc/install/singularity.html.textile.liquid
index 121dd86c6..1f3825395 100644
--- a/doc/install/singularity.html.textile.liquid
+++ b/doc/install/singularity.html.textile.liquid
@@ -9,7 +9,7 @@ Copyright (C) The Arvados Authors. All rights reserved.
 SPDX-License-Identifier: CC-BY-SA-3.0
 {% endcomment %}
 
-Arvados can be configured to use "Singularity":https://sylabs.io/singularity/ instead of Docker to execute containers on cloud nodes or a SLURM/LSF cluster.
+Arvados can be configured to use "Singularity":https://sylabs.io/singularity/ instead of Docker to execute containers on cloud nodes or a SLURM/LSF cluster. Singularity may be preferable due to its simpler installation and lack of long-running daemon process and special system users/groups.
 
 Please note:
 * *Singularity support is currently considered experimental.*
diff --git a/doc/user/topics/arv-docker.html.textile.liquid b/doc/user/topics/arv-docker.html.textile.liquid
index bb1c7dd53..8a97df6e1 100644
--- a/doc/user/topics/arv-docker.html.textile.liquid
+++ b/doc/user/topics/arv-docker.html.textile.liquid
@@ -1,7 +1,7 @@
 ---
 layout: default
 navsection: userguide
-title: "Working with Docker images"
+title: "Working with container images"
 ...
 {% comment %}
 Copyright (C) The Arvados Authors. All rights reserved.
@@ -9,7 +9,9 @@ Copyright (C) The Arvados Authors. All rights reserved.
 SPDX-License-Identifier: CC-BY-SA-3.0
 {% endcomment %}
 
-This page describes how to set up the runtime environment (e.g., the programs, libraries, and other dependencies needed to run a job) that a workflow step will be run in using "Docker.":https://www.docker.com/  Docker is a tool for building and running containers that isolate applications from other applications running on the same node.  For detailed information about Docker, see the "Docker User Guide.":https://docs.docker.com/userguide/
+This page describes how to set up the runtime environment (e.g., the programs, libraries, and other dependencies needed to run a job) that a workflow step will be run in using "Docker":https://www.docker.com/ or "Singularity":https://sylabs.io/singularity/.  Docker and Singularity are tools for building and running containers that isolate applications from other applications running on the same node.  For detailed information, see the "Docker User Guide":https://docs.docker.com/userguide/ and the "Introduction to Singularity":https://sylabs.io/guides/3.5/user-guide/introduction.html.
+
+Note that Arvados always works with Docker images, even when it is configured to use Singularity to run containers. There are some differences between the two runtimes that can affect your containers. See the "Singularity container runtime":{{site.baseurl}}/install/singularity.html page for details.
 
 This page describes:
 
@@ -19,7 +21,7 @@ This page describes:
 
 {% include 'tutorial_expectations_workstation' %}
 
-You also need ensure that "Docker is installed,":https://docs.docker.com/installation/ the Docker daemon is running, and you have permission to access Docker.  You can test this by running @docker version at .  If you receive a permission denied error, your user account may need to be added to the @docker@ group.  If you have root access, you can add yourself to the @docker@ group using @$ sudo addgroup $USER docker@ then log out and log back in again; otherwise consult your local sysadmin.
+You also need to ensure that "Docker is installed,":https://docs.docker.com/installation/ the Docker daemon is running, and you have permission to access Docker.  You can test this by running @docker version at .  If you receive a permission denied error, your user account may need to be added to the @docker@ group.  If you have root access, you can add yourself to the @docker@ group using @$ sudo addgroup $USER docker@ then log out and log back in again; otherwise consult your local sysadmin.
 
 h2(#create). Create a custom image using a Dockerfile
 

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