Listing the mac addresses of nic cards excluding null or loopback MACs i.e. 00:00:00:00:00:00 grep -H . /sys/class/net/*/address | awk ‘{split($0,array,”address:”);print array[2]}’ | grep -v ’00:00:00:00:00:00′
Since live systems are near to impossible to fsck when running (unless you can pull one side of the mirror then clone it to the other (very messy). Become Root sudo su – or su – As root create file in root folder a file named forcefsck touch /forcefsck Restart the system. shutdown -r now
/usr/local/nagios/libexec/check_ifstatus -H localhost   Can’t locate Net/SNMP.pm in @INC (@INC contains: /usr/local/nagios/libexec /usr/local/lib/perl5 /usr/local/share/perl5 /usr/lib/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib/perl5 /usr/share/perl5 .) at ./check_ifstatus line 38. BEGIN failed–compilation aborted at ./check_ifstatus line 38. Solution: yum install perl-Net-SNMP
After testing a nagios configuration update ( including a new service or renaming some host etc..) before committing the changes and reloading / restarting the nagios service a good test is the following: /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
On one of my servers running CentOS 6 I had iptraf not displaying the boxes in dialogues correctly. It’s usually fixed by updating the session configuration on putty to translate to utf-8 but in this case that did not work. While the system is a clone from another machine where it works well (puppet confirms) all…
# yum install yum-priorities # rpm -Uhv http://apt.sw.be/redhat/el5/en/i386/rpmforge/RPMS/rpmforge-release-0.3.6-1.el5.rf.i386.rpm # rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-4.noarch.rpm Install the JPackage Project repository.
I happened to need mkpasswd command in CentOS 6.3 minimal: While there is no package for the tool it can be found in expect command. So run as shown : yum install expect
Exim is no longer available as a standard package, but as with most pieces of Linux software, it’s still only a few commands away. If you want to install Exim to use, or just to try, all you need do is: Install the EPEL (Extra Packages for Enterprise Linux) repository: wget http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-5.noarch.rpm rpm -i epel-release-6-5.noarch.rpm…
Edit /etc/sysconfig/network and set “NETWORKING_IPV6” to “no” For 5.4 and later, replace in /etc/modprobe.conf alias ipv6 off by options ipv6 disable=1 Alternative (which might be easier and works on any release with /etc/modprobe.d): # touch /etc/modprobe.d/disable-ipv6.conf # echo "install ipv6 /bin/true" >> /etc/modprobe.d/disable-ipv6.conf For CentOS 5.3 or older, add the following to /etc/modprobe.conf :…
Just a note for my favorite : add to the ~/.bash_profile PS1="\[\033[35m\]\t\[\033[m\]-\[\033[36m\]\u\[\033[m\]@\[\033[32m\]\h:\[\033[33;1m\]\w\[\033[m\]\$ " result :
