service command

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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I‘m getting the following error when I run mysql -u root -p

Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)

How do I solve this problem under CentOS / RHEL / Red Hat Enterprise Linux server 5.x or 6.x?

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How do I disable firewall on CentOS or Red Hat Enterprise Linux server version 5.x/6.x running on my HP micro server?

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