Sysdig – A general purpose system capture and analysis tool

I've just been looking at a nice new tool called sysdig, which seems to be really useful for analysing and troubleshooting on production systems.  There's a great blog post by Gianluca Borello, detailing how he set up a number of honey-pot servers with poor passwords, and then captured system activity with sysdig, showing exactly how …

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Active Directory to OpenLDAP Sync with LSC

I have recently had to sync accounts and groups from Activc Directory to OpenLDAP, for a requirement for a directory server in the DMZ.  A DMZ (De-millitarised zone) is an area of the network open to the internet.  It's supposed to be separate from the rest of your LAN, so you can have services running …

Simple Steps to Use Yum Rollback on Centos / RHEL 5

Simple Steps to Use Yum Rollback on Centos / RHEL 5 Some nice instructions on a simple backup/rollback technique for packages on Centos / RHEL 5. This can be accomplished even more easily in newer versions of yum, such as on Centos / RHEL 6, which the 'yum history' command.  There's a nice undo feature …

Increasing VMWare Disk Sizes in Linux Without Rebooting

You can increase disk sizes in vmware guests whilst they are running. This is supported, but Linux will not see the new size of the disk until it reboots. There is a way around this (assuming here we are using LVM disks): 1. Increase the disk size in the vmware settings. 2. Logon as root …