[systemd-devel] Logroate + Pass signal to executable in container (nspawn)

[Peter Paule]

Unfortunately, that doesn't help.  I think the problem is, that  
"nspawn" is the
main process for "systemd".

$ man systemctl

   --kill-who
   [...]
   This is different for service units of other types, where the process forked
   off by the manager for ExecStart= is always the main process itself.
   [...]

$ pstree -p

   systemd(1)---systemd-nspawn(15888)---nginx(15889)-+-nginx(15891)
                                                     `-nginx(15892)

Starting service

   $ sudo systemctl start nginx at example_org

Killing service

   $ sudo  systemctl kill --kill-who main --signal SIGUSR1 nginx at example_org

Show status

   $ sudo systemctl status nginx at example_org

  ● nginx at example_org.service - Webservice for example_org
     Loaded: loaded (/etc/systemd/system/nginx at .service; enabled;  
vendor preset: disabled)
     Active: failed (Result: signal) since Tue 2015-02-24 07:24:56 UTC; 1s ago
    Process: 15351 ExecStart=/usr/bin/systemd-nspawn --register=no  
--ephemeral --bind-ro ${SSL_DIR}:/etc/ssl/nginx --bind-ro  
${WWW_DIR}:/srv/www --bind ${LOG_DIR}:/var/log/nginx/ --bind-ro  
${SITES_DIR}:/etc/nginx/sites-enabled/ --bind-ro  
${CONFIG_DIR}:/etc/nginx/other-config/ -M docker-centos-nginx  
/usr/sbin/nginx (code=killed, signal=USR1)
   Main PID: 15351 (code=killed, signal=USR1)
     CGroup: /system.slice/system-nginx.slice/nginx at example_org.service

   Feb 24 07:24:23 example_org systemd: Started Webservice for example_org.
   Feb 24 07:24:23 example_org systemd: Starting Webservice for example_org...
   Feb 24 07:24:23 example_org systemd-nspawn: Spawning container  
docker-centos-nginx on  
/var/lib/machines/.#docker-centos-nginx1426422a6c8fa88c.
   Feb 24 07:24:23 example_org systemd-nspawn: Press ^] three times  
within 1s to kill container.
   Feb 24 07:24:56 example_org systemd: nginx at example_org.service:  
main process exited, code=killed, status=10/USR1
   Feb 24 07:24:56 example_org systemd: Unit nginx at example_org.service  
entered failed state.
   Feb 24 07:24:56 example_org systemd: nginx at example_org.service failed.


Sending the same signal to nginx directly

   $ sudo systemctl kill -s SIGUSR1 nginx

Results in still running nginx

   $ sudo systemctl status nginx
   ● nginx.service - A high performance web server and a reverse proxy server
      Loaded: loaded (/usr/lib/systemd/system/nginx.service; enabled;  
vendor preset: disabled)
      Active: active (running) since Tue 2015-02-24 08:31:35 CET; 6s ago
     Process: 18377 ExecStart=/usr/bin/nginx -g pid /run/nginx.pid;  
error_log stderr; (code=exited, status=0/SUCCESS)
    Main PID: 18378 (nginx)
      Memory: 6.3M
      CGroup: /system.slice/nginx.service
              ├─18378 nginx: master process /usr/bin/nginx -g pid  
/run/nginx.pid; error_log stderr;
              ├─18379 nginx: worker process
              ├─18380 nginx: worker process
              ├─18381 nginx: worker process
              ├─18382 nginx: worker process
              ├─18383 nginx: worker process
              ├─18384 nginx: worker process
              ├─18385 nginx: worker process
              ├─18386 nginx: worker process
              ├─18387 nginx: worker process
              └─18388 nginx: worker process

   Feb 24 08:31:35 host systemd[1]: Starting A high performance web  
server and a reverse proxy server...
   Feb 24 08:31:35 host systemd[1]: Started A high performance web  
server and a reverse proxy server.