Hi! I have application that listens 2-4 tcp ports and i need to upgrade it while running. How can upgrade server and not dropping exiting connected apps (tcp nbd-client like apps)? I don't want to use haproxy or nginx before my app. As i understand i need master process that only listens sockets and fork child app and pass to it accepted connections. So i can upgrade by passing listening fd to new master process and forward new tcp connections to new child? But what can i do with already connected clients to previous child process? Does it possible to do what i need and not dropping exiting tcp connections?
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