[openstack-dev] [Fuel] NTP settings.

Andrew Woodward xarses at gmail.com
Wed Nov 12 15:21:03 UTC 2014

Should we just block the deployment until the NTP is fixed so they
know they need to fix it?

On Wed, Nov 12, 2014 at 6:06 PM, Stanislaw Bogatkin
<sbogatkin at mirantis.com> wrote:
> Hi all,
> Today we have a next workflow about NTP in Fuel:
> 1. When someone deploy a master node, we need to somehow operate with NTP
> and set upstream NTP servers to Fuel NTP daemon on master node.
> 2. NTP will enabled by default and set to default upstream values (from
> ntp.org pool).
> 3. If user will enter to fuelmenu then then he can change that values and it
> will stored as new ones.
> That can lead to some errors at deploy, some as:
> 1. User set upstream NTP (or use defaults).
> 2. By some reasons that NTP servers get unreacheable (i.e. network down).
> 3. User creates environment and push 'deploy' button.
> 4. In the middle of deploy process upstream NTP become reacheable and master
> node sync with them.
> If time on master node before that sync will have big shift regarding to
> real time, then we will have 2 problems:
> 1. Deploy can fail, cause slave nodes will sync with master one time only -
> right after provisioning and if master node resync with upstream in the
> middle of deploy - some services can stop works (e.g. mcollective).
> 3. It will be more complicate to understand logs, cause it will shifted too.
> As I see, we have two ways to solve this:
> 1. Check upstream NTP reachability and disable upstream servers if they
> unreachable at fuelmenu step. It will cost us some shift with real time in
> the end.
>  or
> 2. Disable NTP upstream servers if they unreachable right after user press
> 'deploy' button and enable them after deploy is over.
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