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The configuration files for the SSH client and SSH server typically reside in the directory /etc/ssh/ on a distribution (If you have installed SSH from source into /usr/local, the full path will be /usr/local/etc/ssh/) If you want to make any system-wide changes to defaults for the SSH client, you need to modify the ssh_config file TIP Remember that the sshd_config file is for the server daemon, while the ssh_config file is for the SSH client! Within a user s home directory, SSH information is stored in the directory ~username/ssh/ The file known_hosts is used to hold host key information This is also used to guard against man-in-the-middle attacks SSH will alert you when the host keys change If the keys have changed for a valid reason for instance, if the server was reinstalled you will need to edit the known_hosts file and delete the line with the changed server
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The Secure Shell tool is a superior replacement to Telnet for remote logins Adopting the OpenSSH package will put you in the company of many other sites that are disabling Telnet access altogether and allowing only SSH access through their firewalls Given the wide-open nature of the Internet, this change isn t an unreasonable thing to ask of your users Here are the key issues to keep in mind when you consider Secure Shell: SSH is easy to compile and install Replacing Telnet with SSH requires no significant retraining SSH exists on many platforms, not just UNIX Without SSH, you are exposing your system to potential network attacks in which crackers can sniff passwords right off your Internet connections
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The Secure Shell (SSH)
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In closing, you should understand that using OpenSSH doesn t make your system secure immediately There is no replacement for a set of good security practices Following the lessons from 15, you should disable all unnecessary services on any system that is exposed to untrusted networks (such as the Internet); allow only those services that are absolutely necessary And that means, for example, if you re running SSH, you should disable Telnet, rlogin, and rsh
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Network File System (NFS)
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Linux Administration: A Beginner s Guide
etwork File System (NFS) is the UNIX/Linux way of sharing files and applications across the network The NFS concept is somewhat similar to that of Microsoft Windows disk sharing, in that it allows you to attach to a disk and work with it as if it were a local drive a handy tool for sharing files and large storage space among users Aside from their similar roles, there are some important differences between NFS and Microsoft Windows shares that require different approaches to their management The tools that you use to manage network drives are (of course) different as well In this chapter, we discuss those differences; however, the primary focus of the chapter is to show you how to deploy NFS under the Linux environment
THE MECHANICS OF NFS
As with most network-based services, NFS follows the usual client and server paradigms; that is, it has its client-side components as well as its server-side components 7 covered the process of mounting and unmounting file systems The same idea applies to NFS, except each mount request is qualified with the name of the server from which the disk share is coming Of course, the server must be configured to allow the requested partition to be shared with a client Let s look at an example Assume there exists an NFS server named serverA that needs to share its local /home partition or directory over the network In NFS parlance, it is said that the NFS server is exporting its /home partition Assume there also exists a client system on the network named clientA that needs access to the contents of the /home partition being exported by the NFS server Finally, assume all other requirements are met (permissions, security, compatibility, etc) In order for clientA to access the /home share being exported by serverA, clientA needs to make an NFS mount request for /home to be exported so that it can mount it locally, such that the share appears locally as the /home directory The command to issue this mount request can be as simple as
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