>
> Generally, Puppet uses a service's init script to manipulate it, so
> you can alter services' restart behavior by modifying their init
> scripts. That has the additional advantage that you get the same
> behavior if the service is ever restarted any other way.
>
good point, but now I have to repackge or overlay standard init scripts
(httpd & mysql at least, others are ours so less of an issue)
> There is no way to tell Puppet to start processing one resource,
> switch to processing a different resource, and later resume with the
>
I'd be happy enough for the puppet apply to just stall during bleed-down etc
> first. You could possibly split the load balancer bleed-down and spin-
> up into separate resources, however, and use standard Puppet 'require'
> and 'before' relationships or resource chaining to establish order of
> application. That might be advantageous if there are multiple
> resources you want to manage only while the load-balancer is down.
That sounds interesting, but how would you get the require/before to apply
to just a service restart as a result of the subscription?
eg if i have:
service { 'mysqld':
ensure => running,
enable => true,
subscribe => File['/etc/my.cnf'],
require => [ Package['mysql-server'], File['/prod/mysql'] ],
}
I'm want mysql to restart for any changes to /etc/my.cnf, but only when the
machine is OOS.
We have tools that coordinate restarts atm, but from the C&C out, not boxes
asking of they can restart, I'm thinking along the lines of a hook in the
service resource type to call a user-defined script to check if it's ok to
restart, blocking the puppet run until it gets an answer, the user defined
script then does what ever comms required to see if C&C are ok with the
OOS/restart.
(we do rolling deploys by allowing up to X% of machines in a given service
to go OOS for deployments)
Simon.
--
Simon McCartney
E: si...@mccartney.ie
M: +44 7710 836 915
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