First, "add the appropriate package repository for your distribution":{{ site.baseurl }}/install/install-manual-prerequisites.html#repos.
+{% include 'note_python27_sc' %}
+
On Debian-based systems:
<notextile>
-<pre><code>~$ <span class="userinput">sudo apt-get install perl python-virtualenv fuse python-arvados-python-client python-arvados-fuse crunchstat iptables ca-certificates</span>
+<pre><code>~$ <span class="userinput">sudo apt-get install perl python-virtualenv fuse python-arvados-python-client python-arvados-fuse crunchrunner crunchstat arvados-docker-cleaner iptables ca-certificates</span>
</code></pre>
</notextile>
On Red Hat-based systems:
<notextile>
-<pre><code>~$ <span class="userinput">sudo yum install perl python27-python-virtualenv fuse python27-python-arvados-python-client python27-python-arvados-fuse crunchstat iptables ca-certificates</span>
+<pre><code>~$ <span class="userinput">sudo yum install perl python27-python-virtualenv fuse python27-python-arvados-python-client python27-python-arvados-fuse crunchrunner crunchstat arvados-docker-cleaner iptables ca-certificates</span>
</code></pre>
</notextile>
-{% include 'note_python27_sc' %}
-
h2. Install Docker
Compute nodes must have Docker installed to run jobs inside containers. This requires a relatively recent version of Linux (at least upstream version 3.10, or a distribution version with the appropriate patches backported). Follow the "Docker Engine installation documentation":https://docs.docker.com/ for your distribution.
h2. Copy configuration files from the dispatcher (API server)
-The @/etc/slurm-llnl/slurm.conf@ and @/etc/munge/munge.key@ files need to be identicaly across the dispatcher and all compute nodes. Copy the files you created in the "Install the Crunch dispatcher":install-crunch-dispatch.html step to this compute node.
+The @slurm.conf@ and @/etc/munge/munge.key@ files need to be identical across the dispatcher and all compute nodes. Copy the files you created in the "Install the Crunch dispatcher":install-crunch-dispatch.html step to this compute node.
h2. Configure FUSE
</pre>
</notextile>
-h2. Crunch user account
+h2. Configure the Docker cleaner
+
+The arvados-docker-cleaner program removes least recently used docker images as needed to keep disk usage below a configured limit.
+
+{% include 'notebox_begin' %}
+This also removes all containers as soon as they exit, as if they were run with @docker run --rm@. If you need to debug or inspect containers after they stop, temporarily stop arvados-docker-cleaner or run it with @--remove-stopped-containers never@.
+{% include 'notebox_end' %}
+
+Install runit to supervise the Docker cleaner daemon. {% include 'install_runit' %}
+
+Configure runit to run the image cleaner using a suitable quota for your compute nodes and workload:
+
+<notextile>
+<pre><code>~$ <span class="userinput">sudo mkdir -p /etc/sv</span>
+~$ <span class="userinput">cd /etc/sv</span>
+/etc/sv$ <span class="userinput">sudo mkdir arvados-docker-cleaner; cd arvados-docker-cleaner</span>
+/etc/sv/arvados-docker-cleaner$ <span class="userinput">sudo mkdir log log/main</span>
+/etc/sv/arvados-docker-cleaner$ <span class="userinput">sudo sh -c 'cat >log/run' <<'EOF'
+#!/bin/sh
+exec svlogd -tt main
+EOF</span>
+/etc/sv/arvados-docker-cleaner$ <span class="userinput">sudo sh -c 'cat >run' <<'EOF'
+#!/bin/sh
+exec python3 -m arvados_docker.cleaner --quota <b>50G</b>
+EOF</span>
+/etc/sv/arvados-docker-cleaner$ <span class="userinput">sudo chmod +x run log/run</span>
+/etc/sv/arvados-docker-cleaner$ <span class="userinput">sudo ln -s "$(pwd)" /etc/service/</span>
+</code></pre>
+</notextile>
+
+If you are using a different daemon supervisor, or if you want to test the daemon in a terminal window, an equivalent shell command to run arvados-docker-cleaner is:
+
+<notextile>
+<pre><code><span class="userinput">python3 -m arvados_docker.cleaner --quota <b>50G</b></span>
+</code></pre>
+</notextile>
+
+h2. Add a Crunch user account
Create a Crunch user account, and add it to the @fuse@ and @docker@ groups so it can use those tools:
import arvados, json, socket
fqdn = socket.getfqdn()
hostname, _, domain = fqdn.partition('.')
-ip_address = socket.gethostbyname(fqdn)
-node = arvados.api('v1').nodes().create(body={'hostname': hostname, 'domain': domain, 'ip_address': ip_address}).execute()
+node = arvados.api('v1').nodes().create(body={'hostname': hostname, 'domain': domain}).execute()
with open('/root/node.json', 'w') as node_file:
json.dump(node, node_file, indent=2)
EOF
</code>
</pre>
</notextile>
-