bit by bit
Synopsis I’ve been working through some cost optimization in our cloud environment and am currently focused on Object Storage, tiers and lifecycle management and wanted to post my collective thoughts and observations around it. You can find more in depth analysis in the sources listed at the bottom of the post. Storage Tiers The 4…
Or counting files in any folder(s) for i in `ls -al /var/spool/postfix |grep ‘^d’|awk ‘{print $9}’|grep -v ‘\.$’`; do c=`find $i|wc -l`; echo “$c $i”; done;
So I’ve been dorking around with 389-ds a LOT at work lately and it’s a bitch to setup, especially when it comes to the certs. As a hackathon project I decided to setup FreeIPA, which is the Free version of Redhat Identity Manager as a more comprehensive and easy to manage solution. I have this…
Check installed kernels: # rpm -q kernel kernel-2.6.32-279.el6.x86_64 kernel-2.6.32-279.2.1.el6.x86_64 kernel-2.6.32-279.5.2.el6.x86_64 kernel-2.6.32-279.9.1.el6.x86_64 Remove old kernels: # package-cleanup –oldkernels –count=2 Make it permanent: #vi etc/yum.conf installonly_limit=2
First, we attach the vmdk to the vm and then scan the bus to see it in linux: # echo “- – -” > /sys/class/scsi_host/host0/scan In this scenario, /dev/sda2 and /dev/sdb2 have the same volume group name of VolGroup00, let’s rename /dev/sdb2 to VolGroup01: # vgimportclone –basevgname VolGroup01 /dev/sdb2 next let’s find the new VolumeGroup:…
find . -type d -print0 | xargs -0 du -s | sort -n | tail -10 | cut -f2 | xargs -I{} du -sh {}
For remote graphical access to a linux server I generally prefer to use NX aka nomachine, however I’ve been doing admin work on some shared servers that I don’t want to install NX on for a few different reasons. All of the other admins here use VNC with SSH tunneling to access these boxen so…
I’m now a VCP5! The test was hard and I barely passed it, but I passed it on my first try which most people don’t do. The exam was pretty difficult, with a lot of specific and hardly worded questions. Lots of “Pick 3 answers that apply” kinds of questions. I recommend just taking VMware’s…
Creating a new volume group, adding a disk to it and making it usable Scan HBA for new LUN’s: #echo ‘- – -‘ > /sys/class/scsi_host/hostX/scan #fdisk /dev/sda5 (or /dev/mapper/mpathx if multipathing) … create new partition, type lvm (8e), write changes to disk #partprobe #pvscan #pvdisplay #kpartx -a /dev/mapper/mpathX if it’s a multipathed device using dm-mulipath,…
#scsi_id -g -u -s /block/sdx If it’s a vm #cat /proc/scsi/scsi if it’s a /dev/cciss device(HP SAS) then use #cciss_id /dev/cciss/cXdX -bb