VM image and network configuration at OpenStack environment

This note focuses on VM image and network manipulation at OpenStack environment

Glance is the image service in OpenStack envrionment

Create CentOS7 image

glance image-create --name centos7-64 --file CentOS-7-x86_64-GenericCloud-1706.qcow2 --disk-format qcow2 --container-format bare --progres

Default image directory

/var/lib/glance/images/

You may want to convert raw disk to qcow2

qemu-img convert -f raw -O qcow2 vm-1.img vm-1.qcow2

Edit config parameter for Glance

/etc/glance/glance-api.conf

Restart Glance service to take effect of changes

systemctl restart openstack-glance-api

Neutron is network service at OpenStack environment

Create network

neutron net-create Custom-network --provider:network_type flat --provider:physical_network externalnet --router:external=True --shared

neutron subnet-create --name external_subnet --enable_dhcp=False --allocation_pool start=192.168.1.10,end=192.168.1.250 --gateway=192.168.1.1 --dns 8.8.8.8 External-network 192.168.1.0/24

Restart neutron service

systemctl restart neutron-server.service