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authentication

HowTo: Revoke OpenSSH Keys and Disable User Access

Many users are using ssh to log into a remote machine and append the indicated identity file to machine’s ~/.ssh/authorized_keys file. I recently moved one of my server, and I would like to revoke openssh keys and disable user access under Linux operating systems. How do I revoke OpenSSH keys under Unix or Linux operating systems?
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Linux sys-unconfig: Reconfigure the System Upon Next Boot

I can use unconfigure command on a previously configured Solaris Unix box and leave it in an unconfigured state. How do I unconfigure CentOS Linux OR RHEL 6.x on HP server. How do I reconfigure the system upon next boot?
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HowTo: Install ssh In Linux

How do I install ssh under Linux operating systems?
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Linux / Unix: scp Copy All Hidden Dot Files

I‘m using scp command to copy files from one server to another server. The problem is that I’m unable to copy all hidden files (such as .bash_history). How do I copy hidden files using the scp command under Unix like operating systems?
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Force SSH Client To Use Given Private Key ( identity file )

Recently, my desktop hard disk crashed. So I reinstalled Linux and created a new set of private RSA keys for authentication. However, two of my remote UNIX servers still uses old DSA keys. I do not remember root password for those servers. I do have backup of private and public DSA keys and currently stored in /backup/home/user/.ssh/id_dsa and /backup/home/user/.ssh/id_dsa.pub. How do I force my ssh clients to use identity file /backup/home/user/.ssh/id_dsa to get back to my remote UNIX servers?
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Install / Append SSH Key In A Remote Linux / UNIX Servers Authorized_keys

How do I install my SSH public key ~/.ssh/id_rsa.pub onto a remote Linux and UNIX server automatically from Linux workstation or Apple OS X laptop without using scp and/or copy & paste method?
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Handling nginx Failover With KeepAlived

How do configure to release and obtain VIP (virtual IP) when nginx is dead, down or system is rebooted for the kernel upgrades?
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I‘ve compiled and install an application called gpass on CentOS v5.6. But, when I run the application it does not accept any password from $HOME/.gpass and displays the following error on screen:

libglade-WARNING **: could not find signal handler ‘gpass_authentication_on_response’

How do I fix this problem and use the gpass software?
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Redhat Linux: Change User Password

How do I change password under Redhat Enterprise Linux?
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OpenSuse Linux: How to Read Logs or Log Files

How do I read and/or view logs files under a OpenSuse or Novell Enterprise Linux?
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