Yoga, AlmaLinux9

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 ComputeNode-Prod_Yoga  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

  
  

Because of a bug (https://bugs.launchpad.net/nova/+bug/1978489) we need to have nova version >= 25.3.0 or 25.2.0 (nova version 25.2.1 is affected by the problem). 

• Start and enablepuppet:

  systemctl start puppet; systemctl enable puppet

  
  

• Add the host to the 'admin' aggregate (occhio questa cosa che puo' dare problemi con scheduling ma non l'ho capita bene. meglio non farla)

nova aggregate-add-host admin cld-nl-25.cloud.pd.infn.it

• Enable the checks in Nagios for this host

• Wait till all checks are ok (in particular the VM network and volume one: remember to enable the node just for the time to force the run from Nagios; othwerwise the check will fail.)

• 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_yoga/controller_yoga/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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