bit by bit
Condensed version of this post by Brendan Gregg @ Netflix uptime – load averages dmesg -T | tail – kernel errors vmstat 1 – overall stats by time mpstat -P ALL 1 – cpu balance pidstat 1 – process usage iostat -xz 1 – disk i/o free -m – memory usage sar -n DEV 1…
In a directory find . -name “*ABC*” -exec grep -H ‘XYZ’ {} + This essentially uses find to find the file, then -exec grep will search IN all the matching files for the string you specified.
This entire post was written by Mark Driver, formerly of blindwino.com and all copyrights I assume belong to him. The site and article has been offline for a while but I found it so insightful I saved it. It appears that Mark currently keeps a blog or site @ https://blindwino.wordpress.com/ He can be found on…
10 1 * * * /usr/bin/find /usr/local/stuff -maxdepth 1 -mtime +30 -type d | /usr/bin/xargs -r rm -r
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;
Gary: here’s a great trick for calling in sick. jami – pretend that you’re not listening. nobody copy and paste to HR. Call your boss while lying on your back with your neck hanging over the bed. Peter: Good advice. I always just tried to sound congested, but that sounds more grounded in science. Gary:…
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 {}