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Mastering OpenStack - Second Edition by Chandan Dutta Chowdhury, Omar Khedher

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All green but unreachable

Covering all issues that might occur related to a networking service in OpenStack is a long exercise due to the complexity of such a service. Monitoring systems can trigger notifications when a Neutron process dies or restarts as seen previously. However, in some other cases, it might be more difficult to detect a network issue that prevent users from reaching instances or connecting them to the external network. In most cases, network issues appear when Neutron has been installed with the wrong configuration including plugins and drivers. Additionally, creating networks and routers are error prone operations that could result in a missing virtual tenant network setup. Neutron has reached a very good state of maturity ...

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