upgrade nagios version 4.2.0-4.3.1

1. Downlaod file nagios 4.3.1
wget https://fossies.org/linux/misc/nagios-4.3.1.tar.gz
2. Backup old version
service apache2 stop && service nagios stop
#mkdir /tmp/nagios_backup
#tar -cvvzf /tmp/nagios_backup/nagios_bpk.tar /usr/local/nagios
3. go to path nagios 4.3.1 and unzip file
tar -xzf nagios-4.3.1.tar.gz
cd /root/nagios-4.3.1/
./configure --with-command-group=nagcmd
make all
make install
4. check configure
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
Checking objects...
        Checked 13 services.
        Checked 2 hosts.
        Checked 1 host groups.
        Checked 0 service groups.
        Checked 1 contacts.
        Checked 1 contact groups.
        Checked 24 commands.
        Checked 5 time periods.
        Checked 0 host escalations.
        Checked 0 service escalations.
Checking for circular paths...
        Checked 2 hosts
        Checked 0 service dependencies
        Checked 0 host dependencies
        Checked 5 timeperiods
Checking global event handlers...
Checking obsessive compulsive processor commands...
Checking misc settings...

Total Warnings: 0
Total Errors:   0

5. Restart service apache2, nagios

service apache2 start && service nagios start

6. login to test ing

7. If u want to use backup reading restore