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This guide explains how to add a new compute node


In the following instructions the node cld-np-19, an INFN node, is the one to be added

Step-by-step guide


  • Install the operating system using foreman. For this use the hosts_all foreman hostgroup
  • Disable SELinux
  • Configure the management and data network
  • Stop puppet:
systemctl stop puppet
  • In foreman move the host under the CephProd-C8  hostgroup

  • Run puppet manually:

    puppet agent -t
    If the configuration fails reporting


error: "net.bridge.bridge-nf-call-ip6tables" is an unknown key  
error: "net.bridge.bridge-nf-call-iptables" is an unknown key  
error: "net.bridge.bridge-nf-call-arptables" is an unknown key


then please issue:


modprobe br_netfilter

and then rerun puppet

In the configuration fails reporting a problem because of a wrong dependency required by swtpm, then issue:

mv /etc/yum.repos.d/advanced-virtualization.repo /etc/yum.repos.d/advanced-virtualization.repo.old
yum install centos-release-advanced-virtualization


and then rerun puppet

  • Disable the compute node so that it doesn't accept new VMs:

    openstack compute service set --disable cld-np-19.cloud.pd.infn.it nova-compute

  • Start and enablepuppet:

    systemctl start puppet; systemctl enable puppet

  • Enable the checks in Nagios for this host

  • Wait till all checks are ok (in particular the VM network and volume one)

  • Add this node in the following scripts on cld-ctrl-01: /usr/local/bin/display_usage_of_hypervisors.sh, /usr/local/bin/host_aggregate.sh, /usr/local/bin/new_project.sh, /usr/local/bin/free_resources_compute_nodes.sh
  • Add this node in the /etc/cron.daily/vm-log.sh script on cld-log
  • Create the directory /var/disk-iscsi/qemu/cld-np-19 in cld-log
  • Verify that a ssh from root@cld-log to root@cld-np-19 works without requiring password

  • Stop puppet on the 2 controller nodes:

    systemctl stop puppet

  • Add the new compute node in cld-config:/var/puppet/puppet_train/controller_train/templates/aai_settings.py.erb

  • Run puppet on the first controller node (this will trigger a restart of httpd):

    puppet agent -t

  • Run puppet on the second controller node (this will trigger a restart of httpd):

    puppet agent -t

  • Start puppet on the two controller nodes:

    systemctl start puppet

  • Enable the host:

    openstack compute service set --enable cld-np-19.cloud.pd.infn.it nova-compute

  • Run the aggregate_manage.sh script to add the node in the relevant hostgroups, e.g.:

    /usr/local/bin/aggregate_manage.sh add cld-np-19.cloud.pd.infn.it INFN



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