Search to plant trees - Ecosia.org

Ecosia.org is nothing more than a search engine. I tried it and found it very easy to use. It’s not much different than Google, but there is one BIG difference. When you search the web with Ecosia, 80% of the profits from the search ad revenue goes to support tree planting programs.

By planting a tree, you can fight climate change, restart water cycles, turn deserts back into fertile forests and provide nutrition, employment, education, medical assistance and political as well as economic stability.

So basically Ecosia is a search engine you can use, and by using it you give a hand to help the nature, and the economy in some very poor countries.

So try it and help them to plant trees.

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How to use SAR to troubleshoot linux box and generate reports.

SAR stands for System Activity Report, as its name suggest sar command is used to collect, report & save CPU, Memory, I/O usage in Unix like operating system. SAR command produce the reports on the fly and can also save the reports in the log files as well.
Now a days sar includes in general Linux installation. You can check if sar is installed by executing following command.


rpm -qa | grep sysstat


Incase if sar is not installed you can use following command or RPM package to install it.

yum install sysstat


Sysstat data collection is doing by sadc (system activity data collector). It saves the reports in log file “/var/log/sa/saDD”  where DD represents Current day and already existing files will be archived.


[root@localhost ~]# systemctl start sysstat
[root@localhost ~]# systemctl enable sysstat


It collects the data every 10 minutes and generate its report daily. Below crontab file is responsible for collecting and generating reports.


Generating CPU Report on the Fly 5 times every 2 seconds.


[root@localhost ~]# sar 2 5 

Linux 3.10.0-123.el7.x86_64 (localhost.localdomain)     Monday 26 October 2015     _x86_64_    (2 CPU) 01:43:55  EDT     CPU     %user     %nice   %system   %iowait    %steal     %idle 01:43:57  EDT     all      0.00      0.00      0.25      0.00      0.00     99.75 01:43:59  EDT     all      0.00      0.00      0.00      0.00      0.00    100.00 01:44:01  EDT     all      0.00      0.00      0.25      0.00      0.00     99.75 01:44:03  EDT     all      0.00      0.00      0.25      0.25      0.00     99.50 01:44:05  EDT     all      0.00      0.00      0.00      0.00      0.00    100.00 Average:        all      0.00      0.00      0.15      0.05      0.00     99.80 [root@localhost ~]#

Generating Memory Usage report using -r

Reading SAR log file using -f

[root@localhost ~]# sar -r -f /var/log/sa/sa26

Create Graphs using KSAR tool

You need download KSAR tool to create graphs using /var/log/sa/sar* files

https://sourceforge.net/projects/ksar/

You need to convert time format in sar file before loading to sar you can do it by using following commands

cd /var/log/sa

LC_TIME="POSIX" sar -A -f sa08 > /tmp/sar.data.txt

now download sar.data.txt file and load it in to KSAR

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How to install Apache from source

Download and copy Apache source to local Linux machine

cd /opt/software/httpd-2.4.33


./configure --prefix=/usr/local/apache LD_LIBRARY_PATH=/usr/local/ssl/lib/ LIBS=-L/usr/local/ssl/lib --with-included-apr --enable-ssl --enable-so --enable-http --enable-info --enable-cgi --enable-vhost-alias --enable-rewrite --with-mpm=prefork --enable-mods-shared --enable-deflate --enable-headers --enable-security --enable-reqtimeout --enable-so

make

make install

cp /usr/local/apache/bin/apachectl /etc/init.d/web.system chmod 777 /etc/init.d/web.system

change http.conf according to your settings.

Go to browser and open http://x.x.x.x/index.html