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Robbie Cannings

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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) 1. Open a shell on the console (e.g. Alt + F4) 2. Get the IP address (ifconfig -a) 3. Start the sshd daemon using the anaconda config sshd -f /etc/ssh/sshd_config.anaconda -D 4.…

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

25 May 2017

cannot pxe boot on an interface with spanning-tree portfast disabled

Synopsis I had a situation on a server with a trunked management interface (also communicating on native VLAN) where it refused to PXE boot, but once the OS had booted, everything worked fine. All other systems on that VLAN were able to PXE boot, so it wasn't firewall/…

25 May 2017 Read More
  • PXE
  • cisco

25 May 2017

Expire all objects from a redis cache

Look at the keys, there is content in the cache: [admin@redis ~]$ redis-cli 127.0.0.1:6379> keys * (empty list or set) 127.0.0.1:6379> select 1 OK 127.0.0.1:6379[1]> keys * 1) "3d249bbe820535b87213da5a861cfcb7" 2) "d6b1628d4f49ff60eceb20b2c100c80e" 3)…

25 May 2017 Read More
  • linux

24 May 2017

Querying and Updating Active Directory GIDNumber attribute

I came across a duplicate GIDNumber value in AD Groups. This is a hidden attribute, so can't be viewed/edited using the AD Users and Groups MMC. Querying AD This example shows the main attributes, but not the one we are after PS C:\Users\administratoor> Get-ADGroup…

24 May 2017 Read More
  • powershell
  • active directory

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