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Manage Ownership, Permissions, and Quotas
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c Use command-line utilities to set the ownership and permissions for dtracy s home directory d Run pwck when you re done to verify that the account is configured correctly Let s end this chapter by discussing disk quotas
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Disk quotas are a valuable management tool when you re administering a Linux system The problem here is that, because Linux is a multi-user system, it s possible for one or two users to completely monopolize all the disk space available in the file system This is especially a problem in today s networked world where users are downloading large music files and even larger movie files from the Internet How do you keep these users from consuming more than their fair share of disk space You use disk quotas Put simply, disk quotas establish space limitations for users on the system You can specify that users are each allowed only a certain amount of disk space (a quota) Users are not allowed to exceed this quota To implement quotas on your Linux file system, you first need to install the quota package on your system Some distributions, especially server distributions, install this package as part of the base installation Most distributions, however, will require you to install it separately after the system has been set up See the next chapter to learn how to install packages on a Linux system If you want to check and see if quota is already installed on your system, enter rpm qi quota at the shell prompt To establish quotas, complete the following: 1 Verify that the quota package has been installed on your system 2 Open a terminal session and change to your root user account with su 3 Configure your mounted file systems to use quotas by doing the following: a Open your /etc/fstab file in a text editor b Add the usrquota and grpquota parameters to the mount options for the file system you want to establish quotas on For example, in Figure 7-39, quotas have been established for the / file system c Save your changes to the file and exit the editor d Restart your system so the changes can take effect
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7: Working with Linux Users and Groups
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FIGURE 7-39
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4 After the system has rebooted, create your quota files by doing the following: a Open a terminal session and switch to your root user account with su b At the shell prompt, enter quotacheck amvug The quotacheck utility is used to scan the file system for disk usages as well as create quota files The options used with quotacheck above do the following:
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a: Checks all mounted file systems m: Forces check on mounted file systems u: Checks users g: Checks groups v: Operates in verbose mode
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As the system is checked, you should see several messages appear on screen, as shown in Figure 7-40 You can disregard the messages about old quota files When quotacheck is complete, two files named aquotauser and aquotagroups should have been created in the mount point of your mounted file system, as shown in Figure 7-41
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Manage Ownership, Permissions, and Quotas
FIGURE 7-40
Viewing output from quotacheck
5 Enable quotas on your file system by entering quotaon av at the shell prompt You will need to use chkconfig or insserv to configure the quota service to automatically start each time the system boots We ll talk about how to do this later in this book 6 View current disk space used by your users by entering repquota av at the shell prompt A report is displayed on the screen showing how much space each user is consuming, as shown in Figure 7-42 Notice in Figure 7-42 that no limits have been configured for any users
FIGURE 7-41
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