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Re: openshift memory requirements



ouch, is there another solution? I just want to show some pretty graphs for cpu/network/memory, not to collect them or anything...

תודה,
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On Wed, May 24, 2017 at 1:03 AM, Clayton Coleman <ccoleman redhat com> wrote:
Metrics requires about 4gb by itself

On May 23, 2017, at 5:51 PM, Louis Santillan <lsantill redhat com> wrote:

If the machine is an i7 it likely only has 4 cores/threads total.  3 VM x 2 cores = 6 cores required.  Also, instead of having 3 VMs with at least one IO controller and a NIC each, you have 3 VMs sharing 1 IO controller and 1 NIC.  Not as fun as it sounds.

My lab machine is a HP z820 with 32 cores and 128GB of RAM.  When I spin up a SmartStart style 3x3x3 cluster + 1 bastion host + 1 NFS host (3 masters, 3 infra, 3 app nodes + 2 support hosts), my IO controller can't keep up.  I might as well be running on some 4 year old cellphone.  Which reminds me, I need to move those VMs over to the storage attached to my RAID controller.

-----------------------------------------------------------------------

LOUIS P. SANTILLAN

SENIOR CONSULTANT, OPENSHIFT, MIDDLEWARE & DEVOPS

Red Hat Consulting, NA US WEST

lpsantil gmail com    M: 3236334854    


On Tue, May 23, 2017 at 11:13 AM, Hetz Ben Hamo <hetz hetz biz> wrote:
Well, I installed (through the Ansible install) the origin 1.5 on 3 VM's, each of them had 4 GB RAM, the nodes had 2 cores.I also enabled the metrics.

The entire system barely responded (this is an i7 machine with 16GB RAM). Thats why I asked if there are any changes that I need to add through Ansible to make the system work well with such amount of RAM.

תודה,
חץ בן חמו
אתם מוזמנים לבקר בבלוג היעוץ או בבלוג הפרטי שלי

On Tue, May 23, 2017 at 9:09 PM, Clayton Coleman <ccoleman redhat com> wrote:
OpenShift at that scale probably requires 300-500M on the master and 100-200M at the nodes at that scale.

On Tue, May 23, 2017 at 2:02 PM, Hetz Ben Hamo <hetz hetz biz> wrote:
I thought about 2 nodes with 4GB (and 2 coers) at the beginning and add nodes as needed.
Number of pods - thought about using 6 (2 wordpress, 2 mysql, 2 memcache)

תודה,
חץ בן חמו
אתם מוזמנים לבקר בבלוג היעוץ או בבלוג הפרטי שלי

On Tue, May 23, 2017 at 8:59 PM, Clayton Coleman <ccoleman redhat com> wrote:
How many nodes and pods are you planning to run?

On Tue, May 23, 2017 at 1:43 PM, Hetz Ben Hamo <hetz hetz biz> wrote:
Hi,

I've read the docs about openshift memory requirements and I wanted to ask something..

I'm planning to build a system which will host a web site (wordpress based, for example) which will auto-scale based on the number of visitors..

According to the docs in the link (https://docs.openshift.com/container-platform/3.5/install_config/install/prerequisites.html) it requires 16GB RAM (it's used to be 8GB in 3.0). It doesn't mention the amount of ram needed for the infra nodes in the docs (I assume another 8GB?)

My question: is there any way to build a system with much less ram? something like 4GB for Master, 4GB per node (minimum 2 nodes)? if so, what configurations should I add to my ansible host file?

Thanks

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