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Hi Fabrice, The running operating system on qserv cluster is "Scientific Linux 7", it was done before we move to "CentOS 7". Right now we do not provide support for another OS like "Ubuntu" as a managed server on our deployment and management infrastructure. The kernel version running on qserv cluster is "3.10" and it's the minimum recommended version for running docker. We can try one of the latest kernels, for example a "kernel-ml" from "elrepo", but this is not supported as it may expose the system to security and/or data corruption issues (see: http://elrepo.org/tiki/kernel-ml). I'll discuss it with Yvan and get back to you quickly. Regards, Ahmed On 14/12/15 11:49, Fabrice Jammes wrote: > Hello, > > At JRES2015, I've seen of presentation made by Nicolas Muller and > Jerome Petazzoni (a Docker core developper): > https://conf-ng.jres.org/2015/planning.html#article_180 > > I discussed a long time with Nicolas Muller and he gave me some > interesting informations: > > 1. Kernel Panic: > * Nicolas confirms Docker is used on numerous production > infrastructures on bare-metal cluster without problems. > * Nicolas think we should upgrade to a newer kernel(Andy H. link > push also in this way: > https://conf-ng.jres.org/2015/planning.html#article_180) > * Nicolas also told me that Docker work better on Debian/Ubuntu > (because of the AUFS file system support) > > => *Ahmed and Yvan, could we try to switch to EPEL latest kernel > on IN2P3 cluster* (for ccqserv125...149 first)? Can I do it by myself, > or does it require some Puppet magic? > If this doesn't solve the "Kernel Panic" problem, then I propose > to implement Ahmed proposal: > i.e. put container in VM, which mount data on local block > devices, so that we can restart VM by ourself. Could we please install > Debian in these VM? > > 2. Docker images management on wide-clusters: > * *Docker swarm* should be enough for our needs as a shmux > replacement, > * Mesos is very powerfull and easy to install, but some feature > are commercial, > * Docker UCP (https://www.docker.com/universal-control-plane) is a > Docker commercial solution to manage cluster of containers, if needed > we could have it for cheap price because Docker is looking for its > first customers, > * Kubernetes is a complex solution and Nicolas doesn't recommend > to use it for simple requirements like ours. > > 3. Configuration management > Nicolas recommend to create *data (read-only?) containers to > store/deploy Qserv configuration*. > He think data containers shouldn't be used for our real data and > we should mount it as a we do know. > > 4. Log management > Nicolas recommend to externalize the logs outside containers(this > is what John has done on IN2P3 cluster) > > All of this will of course require some additional JIRA tickets. > > Regards, -- Ahmed Khoudir Centre de Calcul IN2P3/CNRS 21 Avenue Pierre de Coubertin CS70202 69627 Villeurbanne cedex E-Mail : [log in to unmask] Tel. : +33478930880 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the QSERV-L list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=QSERV-L&A=1