20120418 Quantum in the Data Center

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20120418 Quantum in the Data Center

  1. 1. Quantum in the Data Center Bob Kukura <rkukura@redhat.com> Chris Wright <chrisw@redhat.com> Gary Kotton <gkotton@redhat.com> Folsom Design Summit April 18, 20121 Folsom Design Summit 2012
  2. 2. Agenda ● Motivation and goals ● Data center use cases that challenge Quantum ● Specific oVirt integration issues ● Brainstorm ● Folsom work2 Folsom Design Summit 2012
  3. 3. Motivation and Goals ● Quantum assumes "green-field" cloud data center ● What about Quantum in existing data centers? ● as networking service for "enterprise virtualization" ● on-premise private clouds ● Our goal: Integrate Quantum with oVirt3 Folsom Design Summit 2012
  4. 4. Use cases that challenge Quantum ● Connecting to existing networks ● Using heterogeneous network technology ● Non-uniform connectivity ● Deployment issues4 Folsom Design Summit 2012
  5. 5. Existing Networks ● Not all networks can be dynamically allocated ● Static, preexisting networks are relevant for VMs ● VM app tier connecting to non-virtualized db tier ● VM owned by Finance dept must be on VLAN 100 ● Quantum assumes all networks can be dynamically allocated and isolation details (e.g. VLAN tag) have no special meaning5 Folsom Design Summit 2012
  6. 6. Using heterogeneous network technology ● A single data center may use different network technologies in different parts of a single network ● VM app tier on commodity hw using sw switch connecting to db tier on UCS hardware using VM-Fex ● VM on legacy host using Linux bridge communicating to VM on new host using ovs ● Quantum service supports only a single (L2) plugin6 Folsom Design Summit 2012
  7. 7. Non-uniform connectivity ● Not all physical hosts are connected to the same physical networks ● Existing flat networks ● Distinct VLAN trunks ● Different virtual networking technologies ● Hosts connected to different networks ● Common internal network ● DMZ or other isolated security network ● Quantum assumes symmetric connectivity (typically a single NIC too).7 Folsom Design Summit 2012
  8. 8. Deployment issues ● Vif-plugging (nova integration -> oVirt integration) ● Mixed agent versions (rolling update) ● Live migration ● Network properties, e.g. jumbo frames ● Agent polling / scalability ● Port mirroring, IDS ● Inline IPS ● Debugging, e.g. which VLAN was allocated? ● SLA/QoS8 Folsom Design Summit 2012
  9. 9. Brainstorming● Connect to existing networks ● Ability to specify isolation details on create_network() ● Use existing DHCP, IPAM, routing?● Heterogeneous network technology ● Add Quantum support for multiple plugins? ● Directly within Quantum service vs. Meta-plugin ● Single db? VLAN with same meaning across plugins ● Drivers within an open source plugin?● Non-uniform connectivity ● Ability to specify where network/VMs should be created ● zones, realms, cells ● Would this require modeling physical topology?9 Folsom Design Summit 2012
  10. 10. Folsom work ● “Community projects” ● create_network() w/ specific properties ● Multiple L2 plugins could be architecturally invasive ● So could plugins for L3, SGs, etc. ● Consider these together? ● How does a single quantum service handle multiple nova cells?10 Folsom Design Summit 2012

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