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Disable the node so that no new VMs will be scheduled on this host. Instructions: Disable/Enable a compute node howto

Migrate the instances on this compute node to other hypervisors. Instructions: Migrate an instance howto (warning: there was once a problem with live-block migration; we therefore decided to always use cold migration)

Just in case save the file /etc/iscsi/initiatorname.iscsi and the output of "ifconfig" command in cld-ctrl-01:/root/Backup/<hostname>

Reinstall the host with CentOS8 stream using Foreman . Move and move the host to the 'hosts_all' hostgroup

As Operating System choose: CentOS Stream 8

As Media choose: CentOS-Stream-local

As Partition table select

• "Kickstart default - swap 128 GB" (if this machine has 2 disks: one for the OS and one for the VM ephemeral storage). WARNING this will scratch also the second disk. Chidere a Traldi cosa usare per non scratchare il secondo disco
• "Kickstart default - swap 128 GB 1 disk 2 parts" (if this machine has only one disk for both the OS and the VM ephemeral storage

Once the machine is reinstalled make Make sure that SElinux is disabled

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Configure the data network (and, for Unipd nodes, also the storage one for Unipd nodes), e.g.:

nmcli con mod eno3 ipv4.method manual ipv4.addr "192.168.61.129/24" 
nmcli con mod eno3 802-3-ethernet.mtu 9000 
nmcli con up eno3
nmcli con mod eno3 connection.autoconnect yes

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puppet agent -t

If this host has 2 disks (one for the OS and one for the ephemeral storage disk), move /var/lib/nova/instances to the second disk

Start and enablepuppet:

systemctl start puppet; systemctl enable puppet

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Reboot the node.

Enable the host. From cld-ctrl-01 after having sourced admin-openrc.sh:

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

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Force the execution of the sensor "VM network and volume" nagios sensor

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