[Supervisor-users] Zero downtime upgrade

[Yuriy Zhilovets]

Hi everybody!

Some servers (e.g. Nginx, Perl Hypnotoad) has so called zero downtime
upgrade. Some signal, e.g. USR2, causes a server to reload himself
gracefully, not losing existing connections.

How to teach a Supervisord to do "supervisorctl restart xxx" in this way?

Yuriy Zhilovets

[Mikko Ohtamaa]

Hi Yuriy,

What I do is that I let supervisord to do the real hard restart.

When I need zero downtime restart, I'll send the signal by hand. In my case
I use uWSGI "chained reload" through a touch file.

Sometimes one still needs to do a hard restart in the case of reliability
issues and it is handy to have this functionality available.

-Mikko

Post by Yuriy Zhilovets
Hi everybody!
Some servers (e.g. Nginx, Perl Hypnotoad) has so called zero downtime
upgrade. Some signal, e.g. USR2, causes a server to reload himself
gracefully, not losing existing connections.
How to teach a Supervisord to do "supervisorctl restart xxx" in this way?
Yuriy Zhilovets
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https://lists.supervisord.org/mailman/listinfo/supervisor-users

[Yuriy Zhilovets]

Sounds reasonable. Following your advice, I have made Ansible to send USR2
to the working process. Thanks.

Post by Mikko Ohtamaa
Hi Yuriy,
What I do is that I let supervisord to do the real hard restart.
When I need zero downtime restart, I'll send the signal by hand. In my
case I use uWSGI "chained reload" through a touch file.
Sometimes one still needs to do a hard restart in the case of reliability
issues and it is handy to have this functionality available.
-Mikko

Post by Yuriy Zhilovets
Hi everybody!
Some servers (e.g. Nginx, Perl Hypnotoad) has so called zero downtime
upgrade. Some signal, e.g. USR2, causes a server to reload himself
gracefully, not losing existing connections.
How to teach a Supervisord to do "supervisorctl restart xxx" in this way?
Yuriy Zhilovets

[Gustavo Carneiro]

Post by Yuriy Zhilovets
Hi everybody!
Some servers (e.g. Nginx, Perl Hypnotoad) has so called zero downtime
upgrade. Some signal, e.g. USR2, causes a server to reload himself
gracefully, not losing existing connections.
How to teach a Supervisord to do "supervisorctl restart xxx" in this way?

kill -USR2 $(supervisorctl pid xxx)

Post by Yuriy Zhilovets
Yuriy Zhilovets
_______________________________________________
Supervisor-users mailing list
https://lists.supervisord.org/mailman/listinfo/supervisor-users

[Yuriy Zhilovets]

Nice solution. Thank you, Gustavo.

Post by Gustavo Carneiro

Post by Yuriy Zhilovets
Hi everybody!
Some servers (e.g. Nginx, Perl Hypnotoad) has so called zero downtime
upgrade. Some signal, e.g. USR2, causes a server to reload himself
gracefully, not losing existing connections.
How to teach a Supervisord to do "supervisorctl restart xxx" in this way?

kill -USR2 $(supervisorctl pid xxx)