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Some situations require an environment in which limits are set to the system resources that a user can access. Think, for example, of an environment in which a user can use no more than a given number of files at the same time. To configure these limitations, you would modify the /etc/security/limits.conf file. To make sure that the limitations that you set in /etc/security/limits.conf are applied, use the pam_limits module. In /etc/security/limits.conf, limits can be set for individual users as well as groups. The limits can be applied to different items, some of which are listed here: fsize: Maximum file size nofile: Maximum number of open files cpu: Maximum CPU time in minutes nproc: Maximum number of processes maxlogins: Maximum number of times this user can log in simultaneously The following code presents two examples of how these limitations can be applied. In the first line, the user ftp is limited to start a maximum of one process simultaneously. Next, everyone who is a member of the group student is allowed to log in four times simultaneously. ftp @student hard nproc maxlogins 1 4

Listing 6-5. Calculus Expression for Information About Members, Their Team, and Their Team s Manager {m,t,m2 | Member(m), Team(t), Member(m2) AND m.Team = t.TeamName AND t.Manager = m2.MemberID}

Run specified command and continue to run it, even if user logs out Change user s password Check network connectivity between local machine and specified address Display all environment variables for current user Display currently running processes a: List all processes (note that command options don t require preceding dash) f: Display ownership of processes by using tree-style graphics u: Limit results to processes running for and started by current user x: Include processes in results not started by user but running with the user ID -w: Exit after specified number of seconds (such as -w 5)

$ ps *

When applying these limitations, you should remind yourself of the difference between hard and soft limits: a hard limit is absolute, and a user cannot exceed it. A soft limit can be exceeded, but only within the settings that the administrator has applied for these soft limits. If you want to set the hard limit to the same as the soft limit, use a - character as seen in the previous code example for the group student.

Change a process s priority while it s running (see nice) Delete single or multiple files and/or directories

The SQL equivalent is in Listing 6-6.

This useful module looks at the user s mail directory and indicates if there is any new mail. It is typically applied when a user logs in to the system with the following line in the relevant PAM configuration file: login session optional pam_mail.conf

-r: Recursive; delete specified directories and any subdirectories -f: Force; don t prompt for confirmation before deleting (use with care!)

Delete module from kernel Add and create (or view) entries in routing table (see ifconfig) Display current run level Program that runs pseudo shell that is kept alive regardless of current user login -ls: Display list of currently running screen sessions -R: Reattach to already running screen session or start new one if none available

If a user authenticates to a machine for the first time and doesn t have a home directory yet, pam_mkhomedir can be applied to create this home directory automatically. This module will also make sure that the files in /etc/skel are copied to the new home directory. This module is especially useful in a network environment in which users authenticate through NIS or LDAP and do not always work on the same machine. However, it s recommended in such situations to centralize user home directories on an NFS server so that, no matter where a user logs in to a server, a home directory will always be present. 8 contains more information about configuring an NFS server. The disadvantage of pam_mkhomedir is that, if the module is not applied correctly, a user may end up with home directories on many different machines in your network.

Listing 6-6 is equivalent to the SQL in Listing 6-3. The WHERE clause is the equivalent of a join between Member (m) and Team (t) on m.Team = t.TeamName, and another join between Team and another copy of Member (m2) on t.Manager = m2.MemberID.

# route *

$ runlevel $ screen *

If an administrator needs to conduct system maintenance like installing new hardware and the server must be brought down for a few moments, the pam_nologin module may prove useful. This module makes sure that no users can log in when the file /etc/nologin exists. So, before performing any maintenance, make sure to create this file. The user root will always be allowed to log in to the system, regardless of this file existing or not.

$ sftp *