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socket_manager: add feature to share sockets with another server #150

Merged
merged 1 commit into from
Oct 22, 2024
Merged

socket_manager: add feature to share sockets with another server #150

merged 1 commit into from
Oct 22, 2024

Commits on Oct 22, 2024

  1. socket_manager: add feature to share sockets with another server 

    Another process can take over UDP/TCP sockets without downtime.

    server = ServerEngine::SocketManager::Server.share_sockets_with_another_server(path)

This starts a new server that shares all UDP/TCP sockets with
the existing server.
The old process should stop without removing the file for the
socket after the new process starts.

This allows us to replace both the server and the
workers with new processes without socket downtime.
(The existing live restart feature does not support network
servers. We can restart workers without downtime, but there is
no way to restart the network server without downtime.)

ref: fluent/fluentd#4622

Limitation: This feature would not work well if the process
opens new TCP ports frequently.

Signed-off-by: Daijiro Fukuda <[email protected]>
Co-authored-by: Shizuo Fujita <[email protected]>
    @daipom @Watson1978
    daipom and Watson1978 committed Oct 22, 2024
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