Find out DHCP ports which are in DOWN state

There is two DHCP servers running in each network created under openstack. Each network will have two DHCP servers. The virtual machines in this network is getting IP Address from these DHCP servers. Some times, the status of these DHCP ports shows down while wer querying them. There is a bug reported in neutron, in…

Understanding dnsmasq

Dnsmasq provides network infrastructure for small networks: DNS, DHCP, router advertisement and network boot. It is designed to be lightweight and have a small footprint, suitable for resource constrained routers and firewalls. It has also been widely used for tethering on smartphones and portable hotspots, and to support virtual networking in virtualisation frameworks. When we…

Traffic policing in Running VMs – Openstack

One of the major issued facing by a cloud administrator is to control the traffic in/out in a virtual machine. There is two methods you can control this, first one is to inject a special meta-data into the flavor. Second method is to apply special controls on the virtual interface of a running virtual machine.…