Binary upgrade with systemd
Marc Soda
marc at soda.fm
Tue Apr 4 11:41:00 UTC 2017
I sent WINCH to the old master. In this case 32277.
After sending WINCH, I can send QUIT to the old master and it exits. Everything looks fine at that point. But it seems a little odd to have to do this.
> On Apr 4, 2017, at 4:43 AM, Lucas Rolff <lucas at lucasrolff.com> wrote:
>
> Hello Marc,
>
> For which PID do you send the WINCH signal?
>
>
> From: nginx <nginx-bounces at nginx.org <mailto:nginx-bounces at nginx.org>> on behalf of Marc Soda <marc at soda.fm <mailto:marc at soda.fm>>
> Reply-To: "nginx at nginx.org <mailto:nginx at nginx.org>" <nginx at nginx.org <mailto:nginx at nginx.org>>
> Date: Tuesday, 4 April 2017 at 04.04
> To: "nginx at nginx.org <mailto:nginx at nginx.org>" <nginx at nginx.org <mailto:nginx at nginx.org>>
> Subject: Binary upgrade with systemd
>
> 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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