CentOS / RHEL: Yum Lock Package Version At a Particular Version

I am a new CentOS / RHEL 6.x server user and DevOP. I need to lock a package called nginx on a server being updated via yum command. How do I lock package version at a particular version on CentOS / Red Hat Enterprise Linux (RHEL) 6.x or Fedora Linu...

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CentOS Linux 5/6: Change OpenSSH Port Number

I am a new CentOS Linux user. How do I change default sshd tcp port # 22 to 2022 on CentOS Linux version 5/6?You can set or specifies the port number that sshd server listens on. The default is TCP port # ...

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Linux / Unix: whereis Command Examples

Iam a new Linux and Unix-like system command line user. How do I find and locate the binary, source, and manual page files for a given command? You need to use the whereiscommand to find the source, binary, and manuals sections for specified commands or file...

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Nginx: Redirect Backend Traffic Based Upon Client IP Address

I have four Apache backend servers in front of nginx reverse proxy server. How do I make sure nginx reverse proxy load balancer always send specific client IP address (say IP 1.2.3.4) request to http://apachereadwrite/ backend and rest to http://apachereadonly/ backend? Nginx web server does support if conditionalconfiguration....

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