Robbie Cannings

An online space to store my technical observations, learnings and anything which may help me or others in the future.

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    11 Apr 2019

    CentOS needs-restarting continuously triggered after OS install on new hardware

    Issue OverviewI came across a bug/situation, where the needs-restarting utility falsely claims I need to reboot, even though it is a brand new system with a fresh OS, and I have restarted many times. [root@linux-server ~]# needs-restarting --reboothint Core libraries or services have been updated: systemd -> 219-57.…

    11 Apr 2019 Read More
    • linux
    • centos

    07 Jan 2018

    RedHat/CentOS boots into emergency mode if it can't mount a filesystem listed in fstab

    I encountered this on CentOS 7.2 Overview A server had a bad entry in /etc/fstab. This wasn't critical for the operation of the Linux OS (i.e. it wasn't / , /var etc), just a data filesystem. In this case, LVM hadn't quite been configured for datavg, but the filesystem…

    07 Jan 2018 Read More
    • linux
    • centos

    06 Aug 2017

    Linux Multipathing example

    How to configure Multipath IO in CentOS SAN Storage Configuration Perform preliminary configuration steps within the storage controller, FC switches e.g.: LUN Creation FC zoning LUN Masking Install Multipath Driver yum install device-mapper-multipath systemctl enable multipathd systemctl start multipathd Scan the FC HBA device for new LUNs The device…

    06 Aug 2017 Read More
    • linux
    • centos
    • storage

    06 Aug 2017

    Enable sshd in the RedHat Anaconda installer

    To enable sshd in anaconda linux installer: (ignore the host key problem error message) Open a shell on the console (e.g. Alt + F4) Get the IP address (ifconfig -a) Start the sshd daemon using the anaconda config sshd -f /etc/ssh/sshd_config.anaconda -D connect using your ssh…

    06 Aug 2017 Read More
    • linux
    • redhat
    • centos
    • ssh

    11 Feb 2016

    dracut - default behaviour is "hostonly"

    When experimenting with dracut custom initrd builds for Linux to support Dell megaraid, I came across some errors. If you're using dracut to build an initrd for a different system, you may need to add hostonly=no to your command line arguments. Without this approach, you may get errors such…

    11 Feb 2016 Read More
    • centos
    • dracut
    • initrd

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