In these notes the node to be added is cld-np-19.cloud.pd.infn.it
Disable the node so that no new VMs will be scheduled on this host. Instructions: Disable a compute node howto
Migrate the instances on this compute node to other hypervisors. Instructions: Migrate an instance howto
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 using Foreman and move the host to the 'hosts_all' hostgroup
As Operating System choose: CentOS Linux 8.2.2004
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)
- "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 sure that SElinux is disabled
[root@cld-np-19 ~]# getenforce Disabled
Install OpenManage, if this is a DELL host. Instructions: OpenManage howto
Configure the data network (and, for Unipd nodes, also the storage one), 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
Stop puppet:
systemctl stop puppet
In foreman move the host under the ComputeC8CloudVenetoProdTrain hostgroup
Run puppet manually:
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
Verify that a ssh from root@cld-log to root@cld-np-19 works and from nagios@cld-nagios to nagios@cld-np-19 without requiring password
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
Force the execution of the "VM network and volume" nagios sensor