Binary upgrade with systemd
Marc Soda
marc at soda.fm
Tue Apr 4 02:04:27 UTC 2017
Hello,
I’m using nginx 1.10.3 custom built on Ubuntu 16.04. I’m also using the recommended systemd service file:
[Unit]
Description=The NGINX HTTP and reverse proxy server
After=syslog.target network.target remote-fs.target nss-lookup.target
[Service]
Type=forking
PIDFile=/run/nginx.pid
ExecStartPre=/usr/sbin/nginx -t
ExecStart=/usr/sbin/nginx
ExecReload=/bin/kill -s HUP $MAINPID
ExecStop=/bin/kill -s QUIT $MAINPID
PrivateTmp=true
[Install]
WantedBy=multi-user.target
I’m try to do a no downtime upgrade with the USR2 and WINCH signals. Here is my process list before:
root 32277 0.0 0.4 1056672 71148 ? Ss 21:51 0:00 nginx: master process /usr/local/nginx/sbin/nginx
www 32278 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32279 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32280 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32281 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32282 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32283 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32288 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32289 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32290 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32291 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32292 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32293 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32294 0.0 0.4 1056672 72212 ? S 21:51 0:00 \_ nginx: cache manager process
and here it is after sending USR2:
root 32277 0.0 0.4 1056672 71868 ? Ss 21:51 0:00 nginx: master process /usr/local/nginx/sbin/nginx
www 32278 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32279 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32280 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32281 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32282 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32283 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32288 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32289 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32290 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32291 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32292 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32293 0.0 0.4 1057924 73152 ? S< 21:51 0:00 \_ nginx: worker process
www 32294 0.0 0.4 1056672 72212 ? S 21:51 0:00 \_ nginx: cache manager process
root 32461 5.5 0.5 1056676 82316 ? S 22:01 0:00 \_ nginx: master process /usr/local/nginx/sbin/nginx
www 32465 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32466 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32467 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32468 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32469 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32470 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32471 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32472 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32473 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32474 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32475 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32476 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32477 0.0 0.4 1056676 72176 ? S 22:01 0:00 \_ nginx: cache manager process
www 32478 0.0 0.4 1056676 72176 ? S 22:01 0:00 \_ nginx: cache loader process
Notice how the new master is a child of the old master. If I send a WINCH I get:
root 32277 0.0 0.4 1056672 71868 ? Ss 21:51 0:00 nginx: master process /usr/local/nginx/sbin/nginx
root 32461 0.2 0.5 1056676 82316 ? S 22:01 0:00 \_ nginx: master process /usr/local/nginx/sbin/nginx
www 32465 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32466 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32467 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32468 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32469 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32470 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32471 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32472 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32473 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32474 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32475 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32476 0.0 0.4 1057928 73052 ? S< 22:01 0:00 \_ nginx: worker process
www 32477 0.0 0.4 1056676 72176 ? S 22:01 0:00 \_ nginx: cache manager process
www 32478 0.0 0.4 1056676 72176 ? S 22:01 0:00 \_ nginx: cache loader process
which is not what I’m looking for. Is this a limitation when running with systemd?
Thanks,
Marc
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