mirror of https://github.com/apache/cloudstack.git
e06f73e88c
FR12 introduce basic support for comma-separated list of management servers for agents, while makes an explicit LB unnecessary. On the agent side, the 'host' is saved as: <comma separated addresses>@<algorithm name>. Where the algorithm name is the name of the lb algorithm. The This FR introduces two new global settings: - indirect.agent.lb.algorithm: The algorithm for the indirect agent LB. - indirect.agent.lb.check.interval: The preferred host check interval for the agent's background task that checks and switches to agent's preferred host. Any changes to the above two global settings and the 'host' setting does not require restarting of the management server(s). The indirect.agent.lb.algorithm supports following algorithm options: - static: use the list as provided. - roundrobin: evenly spreads hosts across management servers. - shuffle: (pseudo) randomly sorts the list (not recommended for production). From the agent's perspective, the first address in the propagated list will be considered the preferred host. A new background task can be activated by configuring the indirect.agent.lb.check.interval which is a cluster level global setting from CloudStack or admins can override this by configuring the 'host.lb.check.interval' in the host's agent.properties file. Comma-separated management server list is propagated to agents on following cases: - Addition of a host (including ssvm, cpvm systevms). - Connection or reconnection by the agents to a management server. - After admin changes the 'host' and/or the 'indirect.agent.lb.algorithm' global settings. First the agent connects to the management server and sends its current management server list, which is compared by the management server and in case of failure a new/update list is sent for the agent to persist. Every time agent gets a ms-host list and the algorithm, the host specific background check interval is also sent and it dynamically reconfigures the background task without need to restart agents. The 'static' and 'roundrobin' algorithms, strictly checks for the order as expected by them, however, the 'shuffle' algorithm just checks for content and not the order of the comma separate ms host addresses. Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com> |
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