File Creation Troubleshooting
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Video Transcription
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>> Hey there, Cybrarians. Welcome back to
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the Linux Plus course here at Cybrary.
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I'm your instructor Rob Goelz.
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In today's lesson, we're going to be talking
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about file creation issues.
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Upon completion of this lesson,
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you're going to be able to understand
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the types of file creation issues that
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a user may experience and determine
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if the issue is related to quotas,
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inode exhaustion, issues with the file permissions,
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or something weird like immutable files.
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We're going to use some tools to troubleshoot
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file creation issues, such as repquota,
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df, and the list command.
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Users can run into a lot of issues when creating files,
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beyond just the file and directory permissions.
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We might also see problems with
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quotas or inode exhaustion.
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There's quite a few things we can run into
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when we're having file creation issues.
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Now first of all, file quota issues
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are sometimes a cause of
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>> file creation issues for users.
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>> We talked about quotas back in Module 8.
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Just as a refresher,
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we can check for quota issues by first
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checking the /etc/fstab file
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and looking on the entry there for
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the line user quota or repquota.
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If that's specified, it means
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that that partition or mount point has quotas enabled.
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Alternatively, we could use
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the repquota command and we can use
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repquota dash a to show all filesystem quotas,
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that dash a shows all filesystem quotas.
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If we wanted to, we can check
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a user's quota limits with the quota command.
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We can use quota dash u, username,
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and see if that user is reaching their quota.
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Now filesystem space issues
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and inode exhaustion or
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other issues that users encounter.
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Filesystem space issues are
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particularly something you'll see a lot, unfortunately.
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Luckily for us though, the same command is used to
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check and troubleshoot
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filesystem space and inode exhaustion.
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That's the df command which we've seen before.
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Now, by itself, df is just going to present
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a summary output of
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all the filesystem space used and what's available.
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But we can use df dash i,
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the i option, to display the same thing,
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>> but for inodes.
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>> Now we've already discussed file and
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directory permissions issues in this module,
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but this is also a common file creation issue.
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We can use the list command.
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We can use ls dash al to
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check file and directory permissions.
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Then if we find issues,
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we can use change mode,
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chmod or change ownership,
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chown to fix those issues.
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Now, of particular note are immutable files.
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These are weird little things.
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They are files that are configured with
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an attribute set that no one can delete the files.
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These immutable files can be seen
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>> when we run the lsattr command.
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>> So we could do that lsattr and then specify the file,
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>> and we'll see that little i there then
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>> indicates that this file is immutable.
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Now we can either set or remove this by using
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the change attribute or chattr command.
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For example, if we wanted to set
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that immutable attribute we see on file 1,
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we would say sudo change attribute,
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chattr plus i, and then file 1.
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If we want to remove that immutable
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attribute we see above,
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we would do sudo chattr minus i on file 1,
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and that will remove the i that we see.
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In this lesson, we covered the types of
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file creation issues a user is likely to experience,
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and then how to determine if
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a file creation issue is related to quotas,
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inode exhaustion, or issues
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with permissions such as immutable files.
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We also saw how we can use tools, such as
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repquota, quota, df,
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ls, lsattr,
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and chattr to troubleshoot file creation issues.
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Thanks so much for being here and I look
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forward to seeing you in the next lesson.
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