On 10/25/2016 4:47 PM, jha...@gmail.com wrote:
Hello,
My team is building and maintaining a fairly complex software stack that is
being packaged via rpm. As part of the requirements, the service provided by
the .rpm file must be stopped prior to installation / update of the package.
Is there any supported / recommended way to do this? Currently the team uses
the %pre section to check if the service is running and fail if so, but this
seems a bit ugly.
https://fedoraproject.org/wiki/Packaging:Scriptlets
It seems like this is something that could be done in %pretrans, as well.
Alternatively, depending on the paradigm you're working with, you could give
service restart responsibility to the rpm process itself. This already happens
during most daemon updates anyway, so if it's for your team's internal use, I'd
consider saving state in %pretrans, stopping the service (if running), and
starting back up in %posttrans.
On 10/25/2016 5:10 PM, Subhendu Ghosh wrote:
Packaging methods should not be used for this requirement. You should
be using some system automation tools like Ansible or Puppet or Chef
to make that transaction complete smoothly.
Openshift uses Ansible for their cluster upgrades.
I don't see why this needs to be the case.
Between %pre, %post, %verify, and the newer %*trans functions, along
with Requires(pre), etc, 'rpm' provides all the tools you need to
perform modifications of a service using easily-grokkable logic, already
running as root, and using easily-testable methods.
Edge cases like saving state have best-practice implementations already
available, and rpm scriptlets already perform this action for many
services. Meta-packages which perform service control aren't
particularly groundbreaking.
Regards,
-jc
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