Using .htaccess to redirect a page with permanently moved 301

Posted on September 23, 2012September 23, 2012 by David Saliba

Though there are many ways to redirect using the HTTP 301 status code.

(make sure the AllowOverride is set to all on the apache config)

The .htaccess must be as follows:

Options +FollowSymlinks
 RewriteEngine on
 rewritecond %{http_host} ^orig.domain.com [nc]
 rewriterule ^(.*)$ http://new.domain.com/
 $1 [r=301,nc]

Replace the orig.domain.com and new.domain.com with the ones needed for your case of course.

You can setup logs for checking the rewriting though be warned enable them only when debugging they are hugely intensive on I/O and CPU on a heavy utilised server.

More info here : http://httpd.apache.org/docs/2.2/mod/mod_rewrite.html#rewritelog

Nagios fail to run ifstatus

Posted on September 23, 2012September 23, 2012 by David Saliba

/usr/local/nagios/libexec/check_ifstatus -H localhost

&nbsp

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

Nagios configuration debugging

Posted on September 22, 2012September 22, 2012 by David Saliba

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
(more…)

iptraf boxes do not show up well

Posted on September 21, 2012September 21, 2012 by David Saliba

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 I had to do is create an alias in my ./bashrc for iptraf to NCURSES_NO_UTF8_ACS=1 iptraf as such :

# .bashrc

# User specific aliases and functions

alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'

alias iftop='NCURSES_NO_UTF8_ACS=1 iftop'
alias iptraf='NCURSES_NO_UTF8_ACS=1  iptraf'

# Source global definitions
if [ -f /etc/bashrc ]; then
        . /etc/bashrc
fi

As you can deduce the same issue and solution happened with iftop. 🙂

Oh the result :

Ejnoy 🙂

Quick script to get path to latest nagios version

Posted on September 21, 2012September 21, 2012 by David Saliba

If you need to automate the retrieval of the latest Nagios version path to download this is how I do it.

Nothing fancy and it breaks if they change the sourceforge site but we can fix when that happens 🙂

curl -v http://www.nagios.org/download/core/thanks/ 2>&1 | grep tar\.gz | cut -d \” -f 2 | sort -r | head -n 1

Result:

http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.4.1.tar.gz

Of course this comes in handy when pulling for the clients being monitored so by extension:

curl -v http://www.nagios.org/download/plugins/ 2>&1 | grep tar\.gz | cut -d \” -f 2 | sort -r | head -n 1

Result:

http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.16.tar.gz

Getting the files in a script is as easy as :

Ping me if this stops working for you.

Enjoy.

Wireshark: cutting the crap

Posted on September 18, 2012September 21, 2012 by David Saliba

DisplayFilters

Wireshark uses display filters for general packet filtering while viewing and for its ColoringRules.

The basics and the syntax of the display filters are described in the User’s Guide.

The master list of display filter protocol fields can be found in the display filter reference.

If you need a display filter for a specific protocol, have a look for it at the ProtocolReference.

Examples

Show only SMTP (port 25) and ICMP traffic:

```
 tcp.port eq 25 or icmp
```

Show only traffic in the LAN (192.168.x.x), between workstations and servers — no Internet:

ip.src==192.168.0.0/16 and ip.dst==192.168.0.0/16

(more…)

Quick How to install tomcat

Posted on September 17, 2012September 17, 2012 by David Saliba

# 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.

(more…)

Create a raw disk redirection vmdk in Virtualbox

Posted on September 17, 2012September 17, 2012 by David Saliba

Original Post here.

VBoxManage internalcommands createrawvmdk -filename d:\VMs\gCFRAW.vmdk -rawdisk \\.\PhysicalDrive4

C:\Program Files\Oracle\VirtualBox>VBoxManage internalcommands createrawvmdk -filename d:\VMs\gCFRAW.vmdk -rawdisk \\.\PhysicalDrive4

RAW host disk access VMDK file d:\VMs\gCFRAW.vmdk created successfully.

You can also access specific partitions of host physical disk from VirtualBox, run the same command with additional switches,

VBoxManage internalcommands createrawvmdk -filename c: \Users \sunuser \.Virtualbox \VDI \ mydrive.vmdk -rawdisk \ \. \ PhysicalDrive4 -partitions 1,4

1,4 : are the partitions numbers of PhysicalDrive 0. It will allow you to access the first and fourth partitions of the physical drive.

This command also will create a VMDK file and you can access the drives as explained in first method.

mkpasswd on Centos 6.x

Posted on September 17, 2012September 17, 2012 by David Saliba

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

(more…)

Install Exim on centOS

Posted on September 13, 2012 by David Saliba

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

Install the Exim package

yum install -y exim-mysql

Disable Postfix (the default MTA)

service postfix stop
chkconfig postfix off

Set Exim as the default MTA

alternatives --config mta

And finally start Exim

chkconfig exim on
service exim start

You should now be running Exim, and probably want to visit the official documentation site.

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