hi Louis. Your response was very helpful. thanks for all your help
best regards. Sérgio Louis Santillan <[email protected]> escreveu no dia quarta, 27/02/2019 à(s) 19:30: > Sergio, > > Some customers have a previously optimized etcd cluster(s). We can have > OpenShift point at that cluster, if so desired. That is the External Etcd > scenario. This can reduce significant load from the Master nodes. The > other scenario is when OpenShift installs an etcd cluster on the Master > nodes. I rarely hear about the former scenario anymore. > > > As for Masters, the idea is that etcd quorum [0] (in the latter scenario > above) is optimally achieved when we have `(n+1)/2` agreement. > Essentially, what that means that we start with 3 members (2 needed to > achieve quorum) and we should increase the cluster by 2 members to continue > along that curve. However, since etcd needs to sync it's DB across the > Masters, we great greatly increase our network traffic requirements needed > for syncing the DB between the masters for relatively little availability > gain. > > [0] https://coreos.com/etcd/docs/latest/faq.html > > ___________________________________________________ > > LOUIS P. SANTILLAN > > Architect, OPENSHIFT & DEVOPS > > Red Hat Consulting, <https://www.redhat.com/> Container and PaaS Practice > > [email protected] M: 3236334854 > <https://red.ht/sig> > TRIED. TESTED. TRUSTED. <https://redhat.com/trusted> > > > > > On Wed, Feb 27, 2019 at 4:55 AM Sérgio Cascão <[email protected]> wrote: > >> hi Trevor, thanks for your response. >> >> in your link they talk about HA, and these case you have one etcd for >> each master, if the one master goes down, you have always the etcd >> available. >> >> >>> It therefore provides an HA setup where losing a control plane instance >>> or an etcd member has less impact and does not affect the cluster >>> redundancy as much as the stacked HA topology. >> >> >> But my question is more about performance, for example, i know that >> inplementation you have more latency in acess to master. if you can show me >> more vantages and advantages I would be grateful. >> >> best regards >> Sergio >> >> W. Trevor King <[email protected]> escreveu no dia terça, 26/02/2019 à(s) >> 22:30: >> >>> On Tue, Feb 26, 2019 at 2:26 PM Sérgio Cascão wrote: >>> > i like know what the advantages between put etcd separated from >>> masters? >>> >>> Some more docs around these choices in [1]. >>> >>> Cheers, >>> Trevor >>> >>> [1]: https://kubernetes.io/docs/setup/independent/ha-topology/ >>> >> _______________________________________________ >> users mailing list >> [email protected] >> http://lists.openshift.redhat.com/openshiftmm/listinfo/users >> >
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