Hi, I’m Maxime

Cloud Consultant
Public & Private cloud
- OpenStack
- Ceph
- Kubernetes
- DevOps

Slides

root314.com/presentations/osduk2017

QR code

Agenda

What’s a legacy app?
Migrate
Integrate
Questions

What’s a legacy app?

Monolithic
Strong dependencies
Scale up

Examples

ERP / LOB
HA VMs
Physical appliance

Why?

Consolidate (efficiency)
API driven
Self-service
(A first step)

Migrate

Requirements

1:1 migration
Test with snapshots
Downtime
Cinder, nova (KVM) and neutron (OVS)
Enough capacity: 2*disk space
Utility VM in OpenStack
- qemu-utils: qemu-img
- libguestfs-tools: guestfish, virt-v2v

Procedure

Export VM disk to utility VM
Create bootable cinder volume
Attach volume to utility VM
Convert to raw:
- qemu-img convert -O raw in.vmdk /dev/vdx

Linux procedure

guestfish --rw --inspector --add /dev/vdx
- Edit network config
uname -r
- Built-in VirtIO drivers since 2.6.25 (2008)
- Use IDE / SATA to install VirtIO drivers
- Check libguestfs.org/virt-v2v.1.html

Windows procedure

Edit network config
- guestfish --rw --inspector --add /dev/vdx
- or virt-customize --add /dev/vdx --firstboot script.bat
VirtIO drivers
- Put virtio-win.iso into /usr/share/virtio-win/
- virt-v2v -i disk /dev/vdx -if raw --in-place

Boot it up

Detach volume
Volume transfer (optional)
Boot new instance from volume

Further

cloud-init
watchdog
HA
Automate

Integrate

External access

Easy!
Security?
Performance?

Provider networks

Security!
Performance!
Setup?

Provider networks: What?

L2 connectivity
Specify interface & segment ID
Created by admin, used by tenants

=> Use legacy VLAN in OpenStack

Provider networks: How?

# from /etc/neutron/plugins/ml2/ml2_conf.ini
[ovs]
bridge_mappings=physnet1:br0,physnet2:eth2

VLAN_ID=1234
openstack network create vlan-$VLAN_ID \
  --provider-physical-network physnet2 \
  --provider-network-type vlan \
  --provider-segment $VLAN_ID

L2

provider network

L3

provider network

Migrate + Integrate L2

Same IPs
Security group
API etc…

If external gateway:

No floating IP
No cloud-init

Thanks!

root314.com/presentations/
maxime@root314.com

Working with legacy applications in the clouds