[ARVADOS] created: 2.1.0-1314-g97c90a6cd

[Git user]

        at  97c90a6cd2650b0799ef99ead3570d513164c805 (commit)


commit 97c90a6cd2650b0799ef99ead3570d513164c805
Author: Peter Amstutz <peter.amstutz at curii.com>
Date:   Wed Sep 8 16:09:00 2021 -0400

    18024: Add a note about snap packages
    
    Arvados-DCO-1.1-Signed-off-by: Peter Amstutz <peter.amstutz at curii.com>

diff --git a/doc/_includes/_install_compute_docker.liquid b/doc/_includes/_install_compute_docker.liquid
index e3814b23c..a6f2515ab 100644
--- a/doc/_includes/_install_compute_docker.liquid
+++ b/doc/_includes/_install_compute_docker.liquid
@@ -51,3 +51,11 @@ For information about how to set configuration options for the Docker daemon, se
 h3. Changing ulimits
 
 Docker containers inherit ulimits from the Docker daemon.  However, the ulimits for a single Unix daemon may not accommodate a long-running Crunch job.  You may want to increase default limits for compute containers by passing @--default-ulimit@ options to the Docker daemon.  For example, to allow containers to open 10,000 files, set @--default-ulimit nofile=10000:10000 at .
+
+h2. Troubleshooting
+
+h3. Workflows fail with @ValidationException: Not found: '/var/lib/cwl/workflow.json#main'@
+
+A possible configuration error is having Docker installed as a @snap@ package rather than a @deb@ package.  This is a problem because @snap@ packages are partially containerized and may have a different view of the filesystem than @crunch-run at .  This will produce confusing problems, for example, directory bind mounts sent to Docker that are empty (instead of containing the intended files) and resulting in unexpected "file not found" errors.
+
+To check for this situation, run @snap list@ and look for @docker at .  If found, run @snap remove docker@ and follow the instructions to above to "install Docker Engine":#install_docker .

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