By default Apache server listens on TCP port 80 but I’d like an Apache Web Server to listen on port 80 and port 8080. The following article explains how do I configure Apache server to listen multiple ports under CentOS Linux Server?

To configure Apache server to listen multiple ports, you need to login as root and open configure file /etc/httpd/conf/httpd.conf and modify the Listen directive tells the server to accept incoming requests on the specified port.

# vi /etc/httpd/conf/httpd.conf

Find line that read as follows:

Listen 80

Force Apache server to listen on both port 80 and 8080:

Listen 80
Listen 8080

And find the VirtualHost portion for your website config and add *:8080 as shown below:

<VirtualHost *:80 *:8080>
...
</VirtualHost>

Save and close the file. Restart apache server:

# service httpd restart

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How to start/stop/restart networking service under Linux operating systems after making changes to IP configuration from a shell prompt ?

Use the following commands as per your Linux distribution to start/stop/restart the networking service.

RedHat / CentOS / Fedora

To start networking service, enter

# /etc/init.d/network start

Or,

# service network start

To stop networking service, enter

# /etc/init.d/network stop

Or,

# service network stop

To restart networking service, enter

# /etc/init.d/network restart

Or,

# service network restart

Ubuntu / Debian

To start networking service, enter

# sudo /etc/init.d/networking start

Or,

# sudo service networking start

To stop networking service, enter

# sudo /etc/init.d/networking stop

Or,

# sudo service networking stop

To restart networking service, enter

# sudo /etc/init.d/networking restart

Or,

# service networking restart

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rpm is a powerful Package Manager, which can be used to build, install, query, verify, update, and erase individual software packages. A package consists of an archive of files and meta-data used to install and erase the archive files. The meta-data includes helper scripts, file attributes, and descriptive information about the package. Packages come in two varieties: binary packages, used to encapsulate software to be installed, and source packages, containing the source code and recipe necessary to produce binary packages.

Install RPM File

To install an rpm file, open a terminal and then type the following command:

[root@server2 ~]# rpm -ivh file.rpm

Note:
-i: Installs a new package
-v: Print verbose information – normally routine progress messages will be displayed.
-h: Print 50 hash marks as the package archive is unpacked. Use with -v|–verbose for a nicer display.

Upgrade RPM File

[root@server2 ~]# rpm -Uvh file.rpm

Note:
-U: Upgrades or installs the package currently installed to a newer version. This is the same as install, except all other version(s) of the package are removed after the new package is installed.

Erase RPM File

[root@server2 ~]# rpm -ev ile.rpm

Note:
-e: Erase command
The following options may also be used:

--nodeps

Don’t check dependencies before uninstalling the packages.

List of all install packages

Type the following command:

[root@server2 ~]# rpm -qa 

Sample outputs:

...
libxslt-devel-1.1.17-2.el5_2.2
perl-libwww-perl-5.805-1.1.1
libc-client-devel-2004g-2.2.1
libidn-devel-0.6.5-1.1
libjpeg-devel-6b-37
gmp-devel-4.1.4-10.el5
libmcrypt-devel-2.5.8-4.el5.centos
libtidy-0.99.0-12.20070228.el5.centos
libtool-ltdl-1.5.22-7.el5_4
gpg-pubkey-1aa78495-3eb24301
openssl-0.9.8e-12.el5_5.7
NetworkManager-glib-0.7.0-10.el5_5.2
perl-XML-NamespaceSupport-1.09-1.2.1
perl-XML-Filter-BufferText-1.01-1.2.el5.rf
perl-XML-Simple-2.14-4.fc6
rsnapshot-1.3.1-1.el5.rf

List the files and state the installed version of the package called package. Example

[root@server2 ~]# rpm -ql mysql-5.0.77-4.el5_5.5

Sample outputs:

/etc/ld.so.conf.d/mysql-i386.conf
/etc/my.cnf
/usr/bin/msql2mysql
/usr/bin/my_print_defaults
/usr/bin/mysql
/usr/bin/mysql_config
/usr/bin/mysql_find_rows
/usr/bin/mysql_tableinfo
/usr/bin/mysql_waitpid
/usr/bin/mysqlaccess
/usr/bin/mysqladmin
/usr/bin/mysqlbinlog
/usr/bin/mysqlcheck
/usr/bin/mysqldump
/usr/bin/mysqlimport
/usr/bin/mysqlshow
/usr/lib/mysql

Read the man page

[root@server2 ~]# man rpm

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chkconfig provides a  simple  command-line  tool  for  maintaining  the/etc/rc[0-6].d  directory  hierarchy by relieving system administrators of the task of directly manipulating the  numerous  symbolic  links  in those directories.

chkconfig has five distinct functions: adding new services for  management,  removing  services  from management, listing the current startup information for services, changing the  start-up  information  for  services, and checking the start-up state of a particular service.

Synopsis

chkconfig --list [name]
chkconfig --add name
chkconfig --del name
chkconfig [--level levels] name <on|off|reset>
chkconfig [--level levels] name

Example

List status for all services

chkconfig --list

List status for test service

chkconfig --list test

Add service called test

chkconfig --add test

Delete service called test

chkconfig --del test

Turn on & Turn off service

chkconfig --level 3 5 httpd off

The command above will turn off httpd service in run levels 3 and 5.

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