• How do I add password protection to GRUB?

    • August 14, 2020
    • Gritha

    First you will need to generate a strong password as follows: [root@kerndev ~]# /sbin/grub-md5-cryptPassword:Retype password:$1$BaV5k1$02kE6BCxzGRyByx.RWHEd1[root@kerndev ~]# For the headnode: Edit /etc/grub.conf password -md5 <hash> below the timeout line: [root@kerndev ~]# cat /etc/grub.confdefault 0timeout 8 password -md5 $1$BaV5k1$02kE6BCxzGRyByx.RWHEd1 … For the nodes: You will need to perform the change above in /cm/images/<software image>/etc/grub.conf as…

  • I need to optimize the PCI Express performance for my QDR/FDR IB HCA?

    • Gritha

    The MaxReadRequest feature is used to ensure a fairer bandwidth allocation of PCI Express. It specifies the largest read request any PCI Express device can generate. To reduce the way the bus is hogged by large reads one reduces the MaxReadRequest size.  The MaxReadRequest size is set too low and…

  • How do I enable cloudbursting for Amazon eu-central-1 region ?

    • August 12, 2020
    • Gritha

    This article describes how to overcome some problems with using this region, that stem from having an old python-boto package which cannot handle this newer region. Support for eu-central-1 has been added to the boto library with python-boto version 2.34.0. Unfortunately package repositories for operating systems like RHEL 7.0 (Red…

  • How do I do a remote installation?

    • Gritha

    Why do it? The default bare-metal installation is pretty much a no-brainer, so a bare-metal remote installation isn’t that common a need. However, a bare-metal remote installation is useful when the person who can physically access the cluster hardware is expected to spend minimal time at its physical location, and…

  • How do I configure SLURM Fair Shares?

    • Gritha

    SLURM Fair Sharing can be configured using the sacctmgr tool. The following example illustrates how 50% Fair Sharing between two Users, User1 and User2, can be configured 1. create a cluster for which you’ll define accounts and users: # sacctmgr create cluster bcm 2. create a parent account # sacctmgr…

  • How do I configure PBSPro HA with DRBD?

    • Gritha

    Bright Cluster Manager does not support HA (High Availability) for PBSPro when the shared storage used is DAS or DRBD. To achieve HA  in Bright Cluster Manager 7.2, PBSPro must be configured manually as described in this article. Note: As part of this procedure, a copy of the pbs_comm executable is…

  • Can I run Bright with NoMachine on the head node?

    • Gritha

    NX by NoMachine has been used by some of our customers without issues. On thing you will have to note is that if you install a desktop environment like GNOME, you will need to make sure that the Network Manager service is disabled as it will conflict with the network…

  • The VNC console URL isn’t correct in the Horizon dashboard. How do I change it?

    • August 4, 2020
    • Gritha

    This article is being updated. Please be aware the content herein, not limited to version numbers and slight syntax changes, may not match the output from the most recent versions of Bright. This notation will be removed when the content has been updated. You may modify the VNC proxy hostname in Bright…

  • How do I extend an OpenStack cluster with extra controller/network nodes?

    • Gritha

    This article is being updated. Please be aware the content herein, not limited to version numbers and slight syntax changes, may not match the output from the most recent versions of Bright. This notation will be removed when the content has been updated. Scenario: You have installed OpenStack with one controller. Now…

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