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68b65f5b24
This commit introduces signal handling. Parent teleport process is now capable of forking the child process and passing listeners file descriptors to the child. Parent process then can gracefully shutdown by tracking the amount of current connections and closing listeners once the amount goes to 0. Here are the signals handled: * USR2 signal will cause the parent to fork a child process and pass listener file descriptors to it. Child process will close unused file descriptors and will bind to the used ones. At this moment two processes - the parent and the forked child process will be serving requests. After looking at the traffic and the log files, administrator can either shut down the parent process or the child process if the child process is not functioning as expected. * TERM, INT signals will trigger graceful process shutdown. Auth, node and proxy processes will wait until the amount of active connections goes down to 0 and will exit after that. * KILL, QUIT signals will cause immediate non-graceful shutdown. * HUP signal combines USR2 and TERM signals in a convenient way: parent process will fork a child process and self-initate graceful shutdown. This is a more convenient than USR2/TERM sequence, but less agile and robust as if the connection to the parent process drops, but the new process exits with error, administrators can lock themselves out of the environment. Additionally, boltdb backend has to be phased out, as it does not support read/writes by two concurrent processes. This had required refactoring of the dir backend to use file locking to allow inter-process collaboration on read/write operations. |
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