Booting Error - Invalid Partition Table.

Problem : After installation of the Linux operating while booting OS- I am getting Invalid Partition table on the screen.

Root Cause of the Problem : Partition table store in the hard disk mbr(master boot record).
Here the problem, system have two hard disk. so, while booting it is booting from the second hard disk which is does not have os and partition table.that is reason we were getting invalid partion table.Once change boot device priority into first hard disk then the problem has been solved.Os has been booted.

NOTE: depends on the first boot device priority- BIOS it will load MBR/GPT into boot memory from the first boot device.

Study the different between MBR and GPT. - Troubleshooting

Firwall Is Disable Port Is Open - But Unable To Connect From Outside

PROBLEM : All the firewall is disable and port is open, but it is unable to connect from outside.

Scenario: iptables is disable, selinux is disable, fiewall is disable , ufw is disable. All the firewalls are disable and port is open, but still it is unable to connect from outside. nmap and telenet also failed.

Root Cause : Even port is open in the particular application we can set the listen address. By default it is localhost.we need to

Spiritual Personal Responsibility - Bro Zac Poonen

There is only one person in the universe who can spoil and frustrate God’s plan for your life - and that is you yourself. No one else can do it. Not your friends and not your enemies. Not angels and not Satan. Only you. Once we see this, it will liberate us from a great many of our fears and from wrong attitudes towards those who harm us. Once we have seen the sovereignty of God, we will stop blaming people for anything. We’ll no longer be afraid of Satan, fearing that he might harm us in some way. We won’t be afraid of sickness or disease or anything else in this world. -brother Zac Reference Link -

COLPLOT Installation Error Message

while trying web page with IP and  http://X.X.X.X/colplot/index.cgi
I am getting  page is not Found

While checking the log file
[Fri Jan 06 12:12:18 2017] [error] [client] File does not exist: /var/www/colplot
[Fri Jan 06 12:13:12 2017] [error] [client] File does not exist: /var/www/colplot
[Fri Jan 06 12:13:18 2017] [error] [client] File does not exist: /var/www/colplot

Finally I have found the problem in alias.
Alias /colplot "/var/www/colplot"

Needs to be change into Alias /colplot "/var/www/html/colplot"
[root@hostname ~]# cd /etc/httpd/conf.d/
[root@hostname conf.d]# ls
autoindex.conf  colplot-apache.conf  README  userdir.conf  welcome.conf
[root@hn2017 conf.d]# cat colplot-apache.conf
# The following stanza enables colplot

Linux Awk Basic Structure and Workflow

1)Simple Linux awk utility Example.
$ ls | awk ' BEGIN { print "start"} { print } END { print  "stop"}'
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