On Wed, Apr 05, 2017 at 01:29:07AM -0700, Rick Thomas wrote:
On Apr 3, 2017, at 7:36 AM, Tom Browder <tom.brow...@gmail.com> wrote:
But I kind of understand why systemd, but I wish I could find a good
cookbook description of how to add or modify a new process.
+1
Indeed:
The main thing I personally have a problem with in systemd that I did not have
a problem with in sysvinit is that the documentation for how to do things “the
systemd way” is hard to find and opaque once you do find it. In contrast,
anyone who can read and write simple shell scripts has little need for
documentation to do things “the sysvinit way”, though documentation is
available if you want it. Any working sysvinit system has dozens of
self-documenting examples right there in /etc/init.d/ .
Corollary: This is why systemd is needed. So many bad habits have been
"copied" from other scripts. How many sysv scripts' reload functions
consist of "$0 stop; sleep 5; $0 start"? What's that sleep for? A proper
init script should not really be returning from "stop" unless the
daemon has stopped. But many daemons are writted such that it's
difficult to tell - meaning that if you do "$0 stop; $0 start", it's not
reliable.
Systemd deliberately restricts what can be done in order to encourage
better-written init-scripts resulting in a more reliable, more
performant system.
At least, that's the theory.
Pointers to any tutorials as mentioned above by Tom, will be greatly
appreciated!!!
Enjoy
Rick
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