my last example of Bash if statements we created a backup script which would run “rsync” as per the time set in a cron.

But wouldn’t it be nice if we could run our “rsync” script only if there was a change to the files in our directory instead of running a cron every hour […]

On Centos/RH yum install sysstat

vmstat -w 2 mpstat -P ALL 2 iostat -dxm 10

nmon: wget http://pkgs.repoforge.org/nmon/nmon-14g-1.el6.rf.x86_64.rpm rpm -ivh nmon-14g-1.el6.rf.x86_64.rpm

nicstat

wget http://nchc.dl.sourceforge.net/project/nicstat/nicstat-1.92.tar.gz untar yum install glibc.i686 ln -s .nicstat.RedHat_5_i386 .nicstat.RedHat_6_i386

semget: No space left on device

To see how many semaphores are being used, SSH to your server as root and run the following:

ipcs -s

In order to get Apache started again, we must clear the semaphores. Run this for-loop to flush them:

for whatever in `ipcs -s | awk ‘{print $2}’`; do ipcrm […]

root@core /]# yum list Loaded plugins: fastestmirror Determining fastest mirrors Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again

  [epel] … sslverify=false

sed -i “s/mirrorlist=https/mirrorlist=http/” /etc/yum.repos.d/epel.repo

Create a new file named MonitSMS.sh in your /root directory (or wherever you prefer – i use root because I manage many different type of OS) and paste the following code:

#!/bin/sh /usr/bin/curl \ -X POST http://textbelt.com/text \ -d number=1111111111 \ -d “message=[$MONIT_HOST] $MONIT_SERVICE – $MONIT_DESCRIPTION”

Change 1111111111 to your cell/mobile phone number. Give it […]