Re: Questions on Ceph cluster without OS disks

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The default rsyslog in centos has been able to do remote logging for 
many years. 


-----Original Message-----
Cc: ceph-users
Subject:  Re: Questions on Ceph cluster without OS disks

Hello Martin,

I suspect you're using a central syslog server.
Can you share information which central syslog server you use?
Is this central server running on ceph cluster, too?

Regards
Thomas

Am 23.03.2020 um 09:39 schrieb Martin Verges:
> Hello Thomas,
>
> by default we allocate 1GB per Host on the Management Node, nothing on 

> the PXE booted server.
>
> This value can be changed in the management container config file
> (/config/config.yml):
> > ...
> > logFilesPerServerGB: 1
> > ...
> After changing the config, you need to restart the mgmt container.
>
> --
> Martin Verges
> Managing director
>
> Mobile: +49 174 9335695
> E-Mail: martin.verges@xxxxxxxx <mailto:martin.verges@xxxxxxxx>
> Chat: https://t.me/MartinVerges
>
> croit GmbH, Freseniusstr. 31h, 81247 Munich
> CEO: Martin Verges - VAT-ID: DE310638492 Com. register: Amtsgericht 
> Munich HRB 231263
>
> Web: https://croit.io
> YouTube: https://goo.gl/PGE1Bx
>
>
> Am Mo., 23. März 2020 um 09:30 Uhr schrieb Thomas Schneider 
> <74cmonty@xxxxxxxxx <mailto:74cmonty@xxxxxxxxx>>:
>
>     Hello Martin,
>
>     how much disk space do you reserve for log in the PXE setup?
>
>     Regards
>     Thomas
>
>     Am 22.03.2020 um 20:50 schrieb Martin Verges:
>     > Hello Samuel,
>     >
>     > we from croit.io <http://croit.io> don't use NFS to boot up
>     Servers. We copy the OS directly
>     > into the RAM (approximately 0.5-1GB). Think of it like a
>     container, you
>     > start it and throw it away when you no longer need it.
>     > This way we can save the slots of OS harddisks to add more
>     storage per node
>     > and reduce overall costs as 1GB ram is cheaper then an OS disk
>     and consumes
>     > less power.
>     >
>     > If our management node is down, nothing will happen to the
>     cluster. No
>     > impact, no downtime. However, you do need the mgmt node to boot
>     up the
>     > cluster. So after a very rare total power outage, your first
>     system would
>     > be the mgmt node and then the cluster itself. But again, if you
>     configure
>     > your systems correct, no manual work is required to recover from
>     that. For
>     > everything else, it is possible (but definitely not needed) to
>     deploy our
>     > mgmt node in active/passive HA.
>     >
>     > We have multiple hundred installations worldwide in production
>     > environments. Our strong PXE knowledge comes from more than 20
>     years of
>     > datacenter hosting experience and it never ever failed us in the
>     last >10
>     > years.
>     >
>     > The main benefits out of that:
>     >  - Immutable OS freshly booted: Every host has exactly the same
>     version,
>     > same library, kernel, Ceph versions,...
>     >  - OS is heavily tested by us: Every croit deployment has
>     exactly the same
>     > image. We can find errors much faster and hit much fewer errors.
>     >  - Easy Update: Updating OS, Ceph or anything else is just a
>     node reboot.
>     > No cluster downtime, No service Impact, full automatic handling
>     by our mgmt
>     > Software.
>     >  - No need to install OS: No maintenance costs, no labor
>     required, no other
>     > OS management required.
>     >  - Centralized Logs/Stats: As it is booted in memory, all logs 
and
>     > statistics are collected on a central place for easy access.
>     >  - Easy to scale: It doesn't matter if you boot 3 oder 300
>     nodes, all
>     > boot the exact same image in a few seconds.
>     >  .. lots more
>     >
>     > Please do not hesitate to contact us directly. We always try to
>     offer an
>     > excellent service and are strongly customer oriented.
>     >
>     > --
>     > Martin Verges
>     > Managing director
>     >
>     > Mobile: +49 174 9335695
>     > E-Mail: martin.verges@xxxxxxxx <mailto:martin.verges@xxxxxxxx>
>     > Chat: https://t.me/MartinVerges
>     >
>     > croit GmbH, Freseniusstr. 31h, 81247 Munich
>     > CEO: Martin Verges - VAT-ID: DE310638492
>     > Com. register: Amtsgericht Munich HRB 231263
>     >
>     > Web: https://croit.io
>     > YouTube: https://goo.gl/PGE1Bx
>     >
>     >
>     > Am Sa., 21. März 2020 um 13:53 Uhr schrieb huxiaoyu@xxxxxxxxxxxx
>     <mailto:huxiaoyu@xxxxxxxxxxxx> <
>     > huxiaoyu@xxxxxxxxxxxx <mailto:huxiaoyu@xxxxxxxxxxxx>>:
>     >
>     >> Hello, Martin,
>     >>
>     >> I notice that Croit advocate the use of ceph cluster without OS
>     disks, but
>     >> with PXE boot.
>     >>
>     >> Do you use a NFS server to serve the root file system for each
>     node? such
>     >> as hosting configuration files, user and password, log files,
>     etc. My
>     >> question is, will the NFS server be a single point of failure?
>     If the NFS
>     >> server goes down, the network experience any outage, ceph nodes
>     may not be
>     >> able to write to the local file systems, possibly leading to
>     service outage.
>     >>
>     >> How do you deal with the above potential issues in production?
>     I am a bit
>     >> worried...
>     >>
>     >> best regards,
>     >>
>     >> samuel
>     >>
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