-For Debian-based systems, the Arvados package repository includes a backported @docker.io@ package with a known-good version you can install.
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-h2(#configure_docker_daemon). Configure the Docker daemon
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-Crunch runs Docker containers with relatively little configuration. You may need to start the Docker daemon with specific options to make sure these jobs run smoothly in your environment. This section highlights options that are useful to most installations. Refer to the "Docker daemon reference":https://docs.docker.com/reference/commandline/daemon/ for complete information about all available options.
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-The best way to configure these options varies by distribution.
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-* If you're using our backported @docker.io@ package, you can list these options in the @DOCKER_OPTS@ setting in @/etc/default/docker.io@.
-* If you're using another Debian-based package, you can list these options in the @DOCKER_OPTS@ setting in @/etc/default/docker@.
-* On Red Hat-based distributions, you can list these options in the @other_args@ setting in @/etc/sysconfig/docker@.
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-h3. Default ulimits
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-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@.
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-h3. DNS