[Tile-serving] [openstreetmap/mod_tile] Can not find renderd.init after compilation (Issue #343)

[Bingo-Soft]

I'm following [this](https://ircama.github.io/osm-carto-tutorials/tile-server-ubuntu/) nice tutorial and try to install tile server. The problem I'm facing is that I can not find `renderd.init` after compilation. If I list what is in mod_tile folder after compilation, I see this:

```bash
AUTHORS         autogen.sh      configure      libtool         render_speedtest
CMakeLists.txt  autom4te.cache  configure.ac   ltmain.sh       renderd
COPYING         cmake           depcomp        m4              screenshot.jpg
Makefile        compile         docs           missing         src
Makefile.am     config.guess    etc            modules.mk      tests
Makefile.in     config.log      gen_tile_test  render_expired  utils
README.rst      config.status   includes       render_list
aclocal.m4      config.sub      install-sh     render_old
```
So, there is no `debian/renderd.init` in there. What may be wrong with that?

Another issues is with the way how renderd is started. In my case, I have a micro-service and multiple business projects, for each project I need to create its own tiles with its own styles. So, I can not simply `renderd -f` once and leave it. I need to start and stop `renderd` multiple times. In fact I try to do it in the context of WEB request, inside that request I'm using some library that is responsible for spawning processes. But because of this foreground nature of renderd I can not do that, at least it does not work that way. I debugged it and see that my child process goes up to this stage:

```
** INFO: 16:14:58.927: Rendering daemon started (version 0.6.1)
** INFO: 16:14:58.932: Initialising request queue
** INFO: 16:14:58.932: Parsing config file: /etc/renderd.conf
** INFO: 16:14:58.935: config renderd: unix socketname=/var/run/renderd/renderd.sock
** INFO: 16:14:58.935: config renderd: num_threads=4
** INFO: 16:14:58.935: config renderd: num_slaves=0
** INFO: 16:14:58.935: config renderd: tile_dir=/var/cache/renderd/tiles
** INFO: 16:14:58.935: config renderd: stats_file=/var/run/renderd/renderd.stats
** INFO: 16:14:58.935: config renderd: pid_file=/var/run/renderd/renderd.pid
** INFO: 16:14:58.935: config mapnik:  plugins_dir=/usr/lib/mapnik/3.1/input
** INFO: 16:14:58.935: config mapnik:  font_dir=/usr/share/fonts
** INFO: 16:14:58.935: config mapnik:  font_dir_recurse=0
** INFO: 16:14:58.935: config renderd(0): Active
** INFO: 16:14:58.935: config renderd(0): unix socketname=/var/run/renderd/renderd.sock
** INFO: 16:14:58.935: config renderd(0): num_threads=4
** INFO: 16:14:58.935: config renderd(0): tile_dir=/var/cache/renderd/tiles
** INFO: 16:14:58.935: config renderd(0): stats_file=/var/run/renderd/renderd.stats
** INFO: 16:14:58.935: config renderd(0): pid_file=/var/run/renderd/renderd.pid
** INFO: 16:14:58.935: Initialising unix server socket on /var/run/renderd/renderd.sock
```

But as a result I do not see `renderd.sock` inside `/var/run/renderd/` folder. If however, I run `renderd -f` from terminal (not from my micro-service), I see two extra lines:

```
** INFO: 16:14:58.935: Renderd is using mapnik version 3.1.0
** INFO: 16:14:59.896: Running in foreground mode...
```

And `renderd.sock` file is in place and all commands like render_list are working. So, what is so special about running `renderd -f` from a child process in the context of WEB request? And can I fix it some way and run renderd in detached background mode? If yes, how can I configure renderd for this case?

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