3 navsection: installguide
4 title: Install the Crunch dispatcher
8 The dispatcher normally runs on the same host/VM as the API server.
10 h2. Perl SDK dependencies
12 Install the Perl SDK on the controller.
14 * See "Perl SDK":{{site.baseurl}}/sdk/perl/index.html page for details.
16 h2. Python SDK dependencies
18 Install the Python SDK and CLI tools on controller and all compute nodes.
20 * See "Python SDK":{{site.baseurl}}/sdk/python/sdk-python.html page for details.
22 h2(#slurm). Set up SLURM
24 On the API server, install SLURM and munge, and generate a munge key.
26 On Debian-based systems:
29 <pre><code>~$ <span class="userinput">sudo /usr/bin/apt-get install slurm-llnl munge</span>
30 ~$ <span class="userinput">sudo /usr/sbin/create-munge-key</span>
34 On Red Hat-based systems, "install SLURM and munge from source following their installation guide":https://computing.llnl.gov/linux/slurm/quickstart_admin.html.
36 Now we need to give SLURM a configuration file in @/etc/slurm-llnl/slurm.conf@. Here's an example:
40 ControlMachine=uuid_prefix.your.domain
44 StateSaveLocation=/tmp
45 SlurmdSpoolDir=/tmp/slurmd
46 SwitchType=switch/none
48 SlurmctldPidFile=/var/run/slurmctld.pid
49 SlurmdPidFile=/var/run/slurmd.pid
50 ProctrackType=proctrack/pgid
53 TaskPlugin=task/affinity
64 SchedulerType=sched/backfill
66 SelectType=select/cons_res
67 SelectTypeParameters=CR_CPU_Memory
75 JobCompType=jobcomp/none
77 JobAcctGatherType=jobacct_gather/none
81 PartitionName=DEFAULT MaxTime=INFINITE State=UP
82 PartitionName=compute Default=YES Shared=yes
84 NodeName=compute[0-255]
86 PartitionName=compute Nodes=compute[0-255]
90 Please make sure to update the value of the @ControlMachine@ parameter to the hostname of your dispatcher (API server).
92 h2. Enable SLURM job dispatch
94 In your API server's @application.yml@ configuration file, add the line @crunch_job_wrapper: :slurm_immediate@ under the appropriate section. (The second colon is not a typo. It denotes a Ruby symbol.)
96 h2. Crunch user account
98 Run @sudo adduser crunch@. The crunch user should have the same UID, GID, and home directory on all compute nodes and on the dispatcher (API server).
102 Crunch scripts must be in Git repositories in the directory configured as @git_repositories_dir@/*.git (see the "API server installation":install-api-server.html#git_repositories_dir).
104 Once you have a repository with commits -- and you have read access to the repository -- you should be able to create a new job:
107 read -rd $'\000' newjob <<EOF; arv job create --job "$newjob"
108 {"script_parameters":{"input":"f815ec01d5d2f11cb12874ab2ed50daa"},
109 "script_version":"master",
111 "repository":"arvados"}
115 Without getting this error:
118 ArgumentError: Specified script_version does not resolve to a commit
123 * @services/api/script/crunch-dispatch.rb@ must be running.
124 * @crunch-dispatch.rb@ needs @services/crunch/crunch-job@ in its @PATH@.
125 * @crunch-job@ needs the installation path of the Perl SDK in its @PERLLIB@.
126 * @crunch-job@ needs the @ARVADOS_API_HOST@ (and, if necessary in a development environment, @ARVADOS_API_HOST_INSECURE@) environment variable set.
128 Example @/var/service/arvados_crunch_dispatch/run@ script:
135 ## uncomment this line if you use rvm:
136 #rvmexec="/usr/local/rvm/bin/rvm-exec 2.1.1"
138 export PATH="$PATH":/path/to/arvados/services/crunch
139 export ARVADOS_API_HOST={{ site.arvados_api_host }}
140 export CRUNCH_DISPATCH_LOCKFILE=/var/lock/crunch-dispatch
142 fuser -TERM -k $CRUNCH_DISPATCH_LOCKFILE || true
144 ## Only if your SSL cert is unverifiable:
145 # export ARVADOS_API_HOST_INSECURE=yes
147 cd /path/to/arvados/services/api
148 export RAILS_ENV=production
149 exec $rvmexec bundle exec ./script/crunch-dispatch.rb 2>&1