Greg Wooledge wrote: > On Wed, Aug 12, 2020 at 02:59:23PM +0200, Patrick Frank wrote: > > Hello, > > > > on a Debian 10 host I created a virtual machine with very basic features > > to build a dns cache for my home network with djbdns. I fail to understand > > how Daemontools are used properly. > > > > Following the instructions on http://cr.yp.to/djbdns/install.html went okay. > > http://cr.yp.to/djbdns/run-cache-x.html at step 5 is where I am stuck. > > > > When I go to /service/dnscache and execute "run" it says "starting" so I > > try svstat /service/dnscache which outputs: > > "/service/dnscache: unable to open supervise/ok: file does not exist" > > You can execute the "./run" script by hand for testing purposes, to > make sure you've written it correctly, but that's not how daemontools > will run it. If your test is successful, you should Ctrl-C (or otherwise > terminate) the ./run script that you ran manually. Make sure it dies. > > You tell daemontools to run the service by creating a symbolic link > from the /service directory to the directory where the run script > lives. > > For example: > > unicorn:~$ ls -l /service > total 0 > lrwxrwxrwx 1 root root 13 Jan 12 2018 dnscache -> /etc/dnscache/ > lrwxrwxrwx 1 root root 39 Jan 12 2018 qmail-deliverabled -> > /var/qmail/supervise/qmail-deliverabled/ > lrwxrwxrwx 1 root root 31 Jan 12 2018 qmail-send -> > /var/qmail/supervise/qmail-send/ > lrwxrwxrwx 1 root root 28 Jan 12 2018 qpsmtpd -> > /var/qmail/supervise/qpsmtpd/ > > unicorn:~$ ls -l /etc/dnscache/ > total 24 > drwxr-sr-x 2 root root 4096 Jan 12 2018 env/ > drwxr-sr-x 4 root root 4096 Jan 12 2018 log/ > drwxr-sr-x 4 root root 4096 Jan 12 2018 root/ > -rwxr-xr-x 1 root root 142 Jan 12 2018 run* > -rw------- 1 root root 128 Jan 12 2018 seed > drwx--S--- 2 root root 4096 Aug 2 09:00 supervise/ > > The presence of the symlink /service/dnscache is picked up by svscan, > which launches a supervisor process.
This is all correct, but in addition: svc -d /service/dnscache brings it down via the supervisor, similar to the action of "service dnscache stop" or "/etc/init.d/dnscache stop" svc -u /service/dnscache should start running it again All of this clashes with manual invocation of ./run, so that has to be killed before daemontools can take over. -dsr-
