einhyrningsins(1) -- graceful restarts for socket-based daemons
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## SYNOPSIS

`einhyrningsins` [OPTIONS] -- PROGRAM [PROGRAM_ARGS]

## DESCRIPTION

This is a socket multiplexer featuring graceful restarts. It runs multiple
copies of the child program that are passed a shared socket (or more than one)
to bind to and accept connections from. Graceful rolling restarts enable
updates of the child program with zero downtime and no dropped connections.

This program requires special support in the child program to achive the
graceful restarts and bind to inherited file descriptors indicated by
environment variables.

einhyrningsins(1) is a partially-comparible re-implementation of einhorn(1) (a
Ruby program) in Rust.  Einhorn itself derived from Unicorn.

 * `-n`, `--number`=COUNT
   How many child processes to spawn.
 * `-b`, `--bind` ADDR
   Socket(s) to bind to. This argument can be repeated.
 * `-4`, `--ipv4-only`:
   Only accept IPv4 connections
 * `-6`, `--ipv6-only`
   Only accept IPv6 connections
 * `-h`, `--help`
   Print a help menu
 * `--version`
   Print program version
 * `-v`, `--verbose`
   More verbose logging and output

## STATUS

This is a fun fun hobby project. Still in progress, and notably untested.

## COPYRIGHT
Copyright 2016  Bryan Newbold
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO
WARRANTY, to the extent permitted by law.

## SEE ALSO
`einhorn (1)`, `einhyrningsinsctl(1)`