service command

My iptables based firewall allows only port TCP 80 and 443. I also need tcp port # 22, but I do not have static IP at my home. How do I open and close TCP port #22 on demand under Debian or Ubuntu Linux based server systems? How do I install a port-knock server called knockd and configure it with iptables to open tcp port #22 or any other ports?

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I made changes to the httpd.conf file. How do I reload the new config changes without restarting the Apache 2 web server under Debian / CentOS Linux operating systems?

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How do I restart named (Internet domain name server) from ISC using command line option under Debian or Ubuntu Linux server?

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I am a new Red Hat Enterprise Linux server sysadmin. How do I change default sshd tcp port # 22 to 3033 on RHEL v5/6? How do I modify SELinux to allow port 3033 and how do I saftly update firewall on RHEL to allow tcp port # 3033? How do I change ssh port on Redhat Linux operating system?

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I have setup an Apache web server on CentOS Linux. How do I configure firewall to allow or block access? How do I setup firewall for a web server under RHEL or CentOS Linux v6.x?

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How do I install MySQL database server on CentOS Linux version 5 or version 6 using command line options? How do I configuring MySQL server on CentOS Linux?

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How do I install and configure TFTP server under Debian or Ubuntu Linux server to configure networking equipment such as remote booting of diskless devices or remote loading of Unix like operating systems via PXE boot?

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