Linux: History command
Each bash sessions stores the history of commands executed in .bash_history file which in turn in stored under each user’s home directory
usr100@dev01:/tmp/user$ ls
07-14.txt a.txt b.txt d.txt
usr100@dev01:/tmp/user$ cat ~/.bash_history
clear
su root
rm -i d.txt
ls -ltr
touch c.txt
Troubleshooting the above warning message in Nagios:
i) If you can specify the IP address of the host with its port number try specifying it that way instead of the host name
ii) Check the the time that is set for the http check parameter and based on it try setting the -w (warning message) parameter (sample setting: command_line /usr/lib/nagios/plugins/check_http -H mywebsite.com -t 60 -w 55)
The following command will give you the environment settings in Linux
$ env
This is equivalent of PATH in windows.
Setting Tomcat to work on port 80 instead of port 8080
There may be instances when you want Tomcat to run on port 80 and not on port 8080 which is the default port allocated to it on installation.
If Apache is installed in the machine, then you need to stop the apache server (if this were to be for a temporary cause) and if you need it permanently then you should disable apache on start up.
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Configuring Tomcat in Ubuntu with Apache server running on it
Login with the root account. Check if java is already installed on the machine. If not, first install java on ubuntu.
Web get the apache-tomcat tar file from the below location
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HTTP (Hyper Text Transfer Protocol) does not maintain a state. For every request that is made to the server, the server sends a response back. When a request is being made, a NEW socket connection is opened on the server from which the response is sent back. (more…)
How to find the status of SELinux?
$ cat /selinux/enforce
The above command will print 0 or 1 which means,
0 – permissive mode
1 – enforcing mode (more…)
Configuring server host to respond to nagios host (monitor remote services) – CentOS
Download nagios plugin and nagios-nrpe plugin in the server host (client that talks with nagios host) from nagios website. The files comes as .tar files and you need to configure them for their use. Move the files to /usr/src (more…)
Install Perl from ActiveState on Ubuntu machine
I prefer ActiveState download for a beginner to have a Perl installation with compiled libraries for immediate execution of various Perl programs. You can grab a copy based on your OS from
http://www.activestate.com/activeperl/downloads/
Download the x86 .deb file for easy installation of ActivePerl on Ubuntu. (more…)
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