How to Install locate package in RedHat 6

How to Install locate package in RedHat 6

Check whether locate or slocate or mlocate RPM is installed in your machine.
[root@app2 ~]# rpm -qa| grep -i locate

If its not installed then search for the locate package from yum repository.
[root@app2 ~]# yum search locate
=============================== Matched: locate ================================
mlocate.x86_64 : An utility for finding files by name

Now install the locate package. In old version it may be slocate.
[root@app2 ~]# yum install mlocate

[root@app2 ~]# locate testfile
locate: can not stat () `/var/lib/mlocate/mlocate.db': No such file or directory

To resolve the database update issue we need to update database manually. Though cronjob would create it after a restart.
[root@app2 ~]# updatedb

Now you should be able to use locate command in redhat 6.04 or centos 6.04.

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Troubleshooting some nagios error

Troubleshooting Experience:
Troubleshooting some Nagios error:

Recently I was trying to deploy nagios to a RedHat 6 Server which I am use to deploy it in debian box. And as usual I found many problems in the installation procedure. One of the unusal thing is that I use latest nagios 3.5 and it does not have statusmap.cgi file and have some dependency issue. It gave me a hard time to solve the issue :D. So, This is how I fixed those problems-

1. snmp plugin fails due to perl dependency:
Error: Can't locate Net/SNMP.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at ./check_snmp_storage.pl line 15. BEGIN failed--compilation aborted at ./check_snmp_storage.pl line 15.

Solution:
To solve the problem we need to install perl-Net-SNMP which we can implement by following two ways:

Install from rpm:
[root@centoshost01 ~]# wget http://dl.fedoraproject.org/pub/epel/6/x86_64/perl-Net-SNMP-5.2.0-4.el6.noarch.rpm
[root@centoshost01 ~]# wget http://dl.fedoraproject.org/pub/epel/6/x86_64/perl-Crypt-DES-2.05-9.el6.x86_64.rpm
[root@centoshost01 ~]# rpm -ivh perl-Net-SNMP-5.2.0-4.el6.noarch.rpm
[root@centoshost01 ~]# rpm -ivh perl-Crypt-DES-2.05-9.el6.x86_64.rpm

Or
Install from yum:
[root@centoshost01 ~]# vim /etc/yum.repos.d/perl.repo
[Perl]
name=Perl Client
baseurl=http://dl.fedoraproject.org/pub/epel/6/x86_64/
enabled=1
gpgcheck=0

[root@centoshost01 ~]# yum list
[root@centoshost01 ~]# yum install perl-Net-SNMP

2. Error: "Nagios HTTP WARNING: HTTP/1.1 403 Forbidden" shows from the nagios web panel.

Solution:
[root@app1 ~]# vim /var/www/html/index.html
This is local app1 server.
[root@app1 ~]# service httpd restart

3. Error: Not Found - The requested URL /nagios/cgi-bin/statusmap.cgi was not found on this server.

Solution:
This problem happens with the new nagios version 3.5. First check the /usr/local/nagios/sbin folder if it contains the statusmap.cgi file. If not copy the file from the untar nagios folder to /usr/local/nagios/sbin. If nagios 3.5 does not have the statusmap.cgi then download the nagios 3.4.1 and copy the statusmap.cgi to your /usr/local/nagios/sbin location. If still not showing the map from nagios then follow the below steps-

[root@centoshost01 ~]# yum install gd gd-devel

or install it from rpm,
# Download and install gd which is a graphics library for quick creation of PNG or JPEG images
[root@centoshost01 ~]# yum remove gd
[root@centoshost01 ~]# wget http://rpm.pbone.net/index.php3/stat/4/idpl/15161687/dir/redhat_el_6/com/libgd2-2.0.33-2_11.el6.x86_64.rpm.html && wget ftp://ftp.pbone.net/mirror/atrpms.net/sl6-x86_64/atrpms/testing/gd-devel-2.0.33-2_11.el6.x86_64.rpm && wget http://dl.atrpms.net/el6-x86_64/atrpms/testing/gd-2.0.33-2_11.el6.x86_64.rpm
[root@centoshost01 ~]# rpm -ivh libgd2-2.0.33-2_11.el6.x86_64.rpm
[root@centoshost01 ~]# rpm -ivh gd-2.0.33-2_11.el6.x86_64.rpm
[root@centoshost01 ~]# rpm -ivh gd-devel-2.0.33-2_11.el6.x86_64.rpm

[root@centoshost01 ~]# cd /nagios-3.4.1/
[root@centoshost01 ~]# ./configure -with-gd-lib=/usr/local/lib/
[root@centoshost01 ~]# make cgis
[root@centoshost01 ~]# cp /nagios-3.4.1/cgi/*.cgi /usr/local/nagios/sbin
[root@centoshost01 ~]# chown nagios:nagios /usr/local/nagios/sbin/*.cgi

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syslog location in Redhat 6

Troubleshooting Experience:

What is syslog?

- Syslog keeps all the error report of the system. It is extremely necessary for the system administrators to monitor the system status to find out/ troubleshoot any system related issue.

Where is the syslog location in Redhat 6?

- Silly question. But amazingly I didn't find any syslog location in redhat. After some googling I find out that by defaults syslog is not enabled in redhat. We need to enable it manually for the first time. And this is how I did it:

First check that sysconfig package in installed to your system:

[root@mahidul ~]# rpm -qa | grep syslog

rsyslog-gssapi-4.6.2-12.el6.x86_64

rsyslog-mysql-4.6.2-12.el6.x86_64

rsyslog-relp-4.6.2-12.el6.x86_64

rsyslog-4.6.2-12.el6.x86_64

rsyslog-gnutls-4.6.2-12.el6.x86_64

sblim-cmpi-syslog-0.8.0-1.el6.x86_64

rsyslog-pgsql-4.6.2-12.el6.x86_64

If its not installed by default then install it like this way:

[root@mahidul ~]# yum install -y rsyslog

Check the syslog status:

[root@mahidul ~]# service rsyslog status

Restart the service:

[root@mahidul ~]# service rsyslog restart

Start syslog after every time system restart:

[root@mahidul ~]# chkconfig rsyslog on

Optional, If you try to change/customize the syslog settings edit the below location:

[root@mahidul ~]# vim /etc/rsyslog.conf

At last check the syslog:

[root@mahidul ~]# tail -f /var/log/messages

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