You can definitely compile (`make`) without downtime. 

Installation without downtime is likely safe, but I don’t think you’ll find many people willing to give you a guarantee on it.  The biggest problems with just running `make install` blindly are the potential to clobber config files or anything continuously run.  If memory serves, there is a “make deinstall” (or similar) option that doesn’t actually execute anything but will generate a list of files to be deleted. The last time I did an upgrade that required recompilation I used this to create a small shell script of things to delete.  I then upgraded like:

service kamaliio stop && cp /etc/kamailio /etc/kamailio.bak && kamailio_uninstall.sh && make install && mv /etc/kamailio /etc/kamailio.orig && mv /etc/kamailio.bak /etc/kamailio && service kamailio start

This is probably overkill, but I think it took less than a minute to actually run.

From: satyaprakash ch via sr-users <sr-users@lists.kamailio.org>
Sent: Wednesday, April 17, 2024 11:19 AM
To: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>
Cc: satyaprakash ch <chiramchetty.satyaprakash@gmail.com>
Subject: [SR-Users] compile without downtime

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HI

I currently have two proxy servers running in my environment, and I want to upgrade Kamailio from version 5.4.7 to 5.6.

Can I recompile the Kamailio service before restarting it without downtime ? Will there be any impact on my production environment if I recompile Kamailio to the newer version? If there is no impact, I expect approximately 2 minutes of downtime during the service restart.

Here's the scenario:

No Downtime:
Clone the Kamailio repository with git clone https://github.com/kamailio/kamailio.git
Navigate to the Kamailio directory with cd kamailio
Update the modules.lst file with any necessary additions
Compile with make
Install with make install
Downtime:
Restart the Kamailio service.


Please advise on this.

Thanks.