Xen

Cheatsheet & quick tips

Create NFS Share on Xen8
Create a Xen pool (cluster)
Xen ISO folder
Xen New VM
Lan Switch
Snapshots And Templates

Create NFS Share on Xen8

Add Drive that will be used as NFS share in fstab

vi /etc/fstab

UUID="XXXXXX" /data01 xfs defaults 0 0

Mount it

mount -a

vi /etc/exports

/data01 10.10.10.0/24(rw,sync,no_root_squash)

Edit portmap

vi /etc/sysconfig/portmap

PMAP_ARGS=""

Enable and start services

systemctl enable rpcbind
systemctl enable nfs-server
systemctl enable nfs-lock
systemctl enable nfs-idmap

systemctl restart rpcbind
systemctl restart nfs-server
systemctl restart nfs-lock
systemctl restart nfs-idmap

Allow port

vi /etc/sysconfig/iptables

-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 111 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 2049 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 975 -j ACCEPT

Restart service

systemctl restart iptables

Test connection on remote host

mount 10.10.10.X:/data01 /mnt/

xe sr-create content-type=user \
    name-label="data01" shared=true \
    device-config:server=10.X.X.X device-config:serverpath=/data01 type=nfs \
    nfsversion="3", "4"

Create a Xen pool (cluster)

Connect on master

xe pool-list --minimal

Create pool with UUID

xe pool-param-set name-label="pool.myhypervisor.ca" uuid=<UUID>

Edit hostfile with all FQDN's on all nodes

vim /etc/hosts

masternode.myhypervisor.ca 10.X.X.11
othernode.myhypervisor.ca 10.X.X.12

Connect on other nodes

xe pool-join master-address=masternode.myhypervisor.ca master-username=root master-password=PASSWORD

wait 30 sec and check host list

xe host-list

Xen ISO folder

Find server UUID:

xe host-list

Create ISO folder

mkdir -p /var/opt/xen/ISO

Create SR for ISO

xe sr-create name-label="Local ISO" type=iso host-uuid=<host-uuid> device-config:location=/var/opt/xen/ISO device-config:legacy_mode=true content-type=iso

Rescan after downloading a new ISO

xe sr-scan uuid=<sr_uuid>

check for ISO

xe cd-list

To remove the SR

Find SR PDB UUID

xe pbd-list sr-uuid=<UUID of SR>

Unplug SR

xe pbd-unplug uuid=<UUID of PBD>

Forget SR

xe sr-forget uuid=<UUID of SR>

Xen New VM

Find ISO SR UUID

xe sr-list

uuid ( RO) : XXXXXXXX-XXXXX-XXX-XXXX-XXXXXXXX
name-label ( RW): data01
host ( RO): <shared>
type ( RO): nfs
content-type ( RO): user

Find name of template

xe template-list

xe vm-install template="<template_name>" new-name-label=<name_for_vm> sr-uuid=<storage_repository_uuid>

Example

xe vm-install template="Ubuntu Bionic Beaver 18.04" new-name-label=test.myhypervisor.ca sr-uuid=<storage_repository_uuid>

Find UUID for VM

xe vm-list

uuid ( RO) : XXXXXXXXXXXXXXXXXXXXX
name-label ( RW): test.myhypervisor.ca
power-state ( RO): halted

Find ISO UUID

xe cd-list

uuid ( RO) : XXXXXXXXXXXXXXXXXXXXXXXXX
name-label ( RW): ubuntu-18.04.2-live-server-amd64.iso

Find network UUID

xe network-list bridge=xenbr0 --minimal

List virtual drive

xe vm-disk-list vm=<vm-uuid>

VDB is the ISO assigned on the VM, VDI is the virtual drive

Disk 0 VBD:
uuid ( RO) : XXXXXXXXXXXXXXXXXXXXXxx
vm-name-label ( RO): test.myhypervisor.ca
userdevice ( RW): 0

Disk 0 VDI:
uuid ( RO) : XXXXXXXXXXXXXXXXXXXXXxx
name-label ( RW): 0
sr-name-label ( RO): data01
virtual-size ( RO): 10737418240

Add ISO

xe vm-cd-add uuid=<vm-uuid> cd-name=ubuntu-18.04.2-live-server-amd64.iso device=1
xe vm-param-set HVM-boot-policy="BIOS order" uuid=<vm_uuid>

Add network on VM

xe vif-create vm-uuid=<vm_uuid> network-uuid=<network_uuid> device=0

Add VM RAM

xe vm-memory-limits-set uuid=<uuid of the valid VM> static-min=<nn>GiB/MiB dynamic-min=<nn>GiB/MiB dynamic-max=<nn>GiB/MiB static-max=<nn>GiB/MiB

Increase VDI

xe vdi-resize uuid=<vdi-uuid> disk-size=15GiB

Start VM

xe vm-start uuid=<vm-uuid>

Get id

list_domains | grep <vm-uuid>

3 | XXXXXXXXXXXXXX | B H

First number is the domid

xl console <dom-id>

Lan Switch

Create a network for the new interface to be attached to, and returns the network-uuid

xe network-create name-label="LAN-VM"

Find vm uuid of the VM

xe vm-list name-label=<vm's name-label>

Create eth1 interface for the VM, and gets the uuid of the new interface

xe vif-create vm-uuid=<vm-uuid> network-uuid=<network-uuid> device=1 mac=random

You can later list the UUID of the new NIC on that vm:

xe vif-list vm-uuid=<vm-uuid>

Hot-plug the created interface to the VM

xe vif-plug uuid=<new_vif_uuid>

To disconnect

xe vif-unplug uuid=<vif uuid>
xe vif-destroy uuid=<vif uuid>

To find Mac on a port:

xe vm-vif-list params=dhcp.myhypervisor.ca,MAC

Snapshots And Templates

Create new snapshot

Find UUID

xe vm-list

Create snapshot

xe vm-snapshot new-name-label="<name>" vm=<vm-uuid>

Restore a snapshot

xe snapshot-revert snapshot-uuid=<uuid>

List snapshots

xe snapshot-list

Create a template from snapshot

xe snapshot-export-to-template snapshot-uuid=<snapshot-uuid> filename="<name>.xva"  preserve-power-state=false

List SR

xe sr-list name-label=<name>

Import template in SR

xe vm-import filename=<name>.xva sr-uuid=<sr-uuid>

Find template UUID

xe template-list

Create VM from template

xe vm-install template-uuid=<template-uuid> new-name-label=<new-name>

List template UUID

xe template-list name-label="<name>" --minimal

Xen