はてなブックマーク

This is post #4 in my December-long series on Linux VM performance tuning, Tuningmas. One of those timeless questions in system administration has always been “how much swap space do I configure on my server?” The old rule used to be twice the amount of memory, but does a server with 256 GB of RAM really need a half terabyte of swap? And what about VMs? Swapping on VMs is a serious performance dra

Did you know that when you’re using OpenSSH from the command line you have a variety of escape sequences available to you? SSH somewhere, then type “~” and “?” (tilde, then question mark) to see all the options. You should get something like: Supported escape sequences: ~.  - terminate connection (and any multiplexed sessions) ~B  - send a BREAK to the remote system ~C  - open a command line ~R  -

How to Configure IPMI on a Dell PowerEdge running Red Hat Enterprise Linux This is intended to help fairly knowledgeable people get IPMI working on their hosts so they can issue remote commands to their hardware. I focus on Red Hat Enterprise Linux on a Dell, but it is likely to work on other hosts, distributions, and OSes, too. This works for me on Dell PowerEdge 1850, PowerEdge 2850, Dell PowerE