The default rsyslog in centos has been able to do remote logging for many years. -----Original Message----- Cc: ceph-users Subject: [ceph-users] 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@croit.io <mailto:martin.verges@croit.io> 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@gmail.com <mailto:74cmonty@gmail.com>>:
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@croit.io <mailto:martin.verges@croit.io> > 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@horebdata.cn <mailto:huxiaoyu@horebdata.cn> < > huxiaoyu@horebdata.cn <mailto:huxiaoyu@horebdata.cn>>: > >> 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 >>