[slurm-users] Unauhtenticated "Configless" Slurm

[Nicolas Greneche]

Hi !

I try to use configless slurm. Here is my very simple slurm.conf :

root at admin:~# cat /opt/slurm/etc/slurm.conf
ClusterName=dummy
ControlMachine=admin
SlurmUser=slurm
AuthType=auth/none
CredType=cred/none
JobContainerType=job_container/none
ProctrackType=proctrack/linuxproc
StateSaveLocation=/slurm/slurmctld
SlurmdSpoolDir=/slurm/slurmd
SlurmctldPidFile=/slurm/slurmctld.pid
SlurmdPidFile=/slurm/slurmd.pid
SlurmdLogFile=/slurm/slurmd.log
SlurmctldLogFile=/slurm/slurmctld.log
SlurmctldParameters=enable_configless

NodeName=node[1-2] Procs=4 State=UNKNOWN
PartitionName=COMPUTE Nodes=node[1-2] Default=YES MaxTime=INFINITE State=UP

As you can see, munge is disabled (it's a very specific use of slurm).

Moreover, I disabled munge at compile time :

./configure --enable-slurmrestd --enable-multiple-slurmd --without-munge 
--prefix=/opt/slurm-20.11.8

When I start slurmctld like this :

root at admin:~# /opt/slurm/sbin/slurmctld -v -D -f /opt/slurm/etc/slurm.conf

Then, I go to the first compute node, node1 :

root at node1:~# /opt/slurm/sbin/slurmd --conf-server admin:6817 -D
slurmd: error: Couldn't find the specified plugin name for auth/munge 
looking at all files
slurmd: error: cannot find auth plugin for auth/munge
slurmd: error: cannot create auth context for auth/munge
slurmd: error: slurm_send_node_msg: g_slurm_auth_create: REQUEST_CONFIG 
has authentication error: Operation not permitted
slurmd: error: _fetch_child: failed to fetch remote configs
slurmd: error: _establish_configuration: failed to load configs
slurmd: error: slurmd initialization failed

As you can see, slurmd on node1 tries to authenticate with munge. on 
slurmctld we have those outputs :

slurmctld: error: slurm_receive_msg [172.16.0.11:50340]: Zero Bytes were 
transmitted or received
slurmctld: agent/is_node_resp: node:node1 
RPC:REQUEST_NODE_REGISTRATION_STATUS : Communication connection failure
slurmctld: agent/is_node_resp: node:node2 
RPC:REQUEST_NODE_REGISTRATION_STATUS : Communication connection failure

Do we have a way to force slurmd not using munge while dynamically 
getting its configuration ?

Kind regards,

-- 
Nicolas Greneche
USPN
Support à la recherche / RSSI
https://www-magi.univ-paris13.fr