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So, to work with file systems, they need to be mounted.

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And even if nowadays there are system demounts, ETCFSSTEP is still the standard.

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So let's discuss what is going on in this important configuration file.

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So ETCFSSTEP is used to automate mounts.

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In current Linux, it's used as an input file for the FSSTEP generator.

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And that is a systemd component that generates the system demounts.

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We talked about it in an earlier lesson.

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In ETCFSSTEP, six columns are used to automate mounts.

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The first column has the name of the device or the UUID or label, if you want to mount

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by UUID or label.

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Then there is the mount point, followed by the file system type.

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Next there are the mount options.

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And column five and six are for the dump option and the FSCHEC option.

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The dump option enables or disables support for the legacy dump utility.

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As it is a legacy utility, not many people are using it anymore, and in many cases you

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will find zero.

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FSCHEC is determining the order for a file system check.

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File system check is also something that belongs to older file systems.

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Basically EXE2, EXE3 were using it.

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Now what was the idea?

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Well, if your server crashed and it came up again, then file systems were checked.

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And the FSCHEC option would be used to determine the order of checking.

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Zero means no checking.

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One means check this first.

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Two means check this after the file system that has been marked with a one.

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In current FSSTEP configurations, you will find zero, zero in most cases for dump and

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FSCHEC.

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Let's explore the contents of this configuration file.

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So here we have the ETCFS app, and we already worked with it, so it can be quite fast.

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Maybe this one is interesting.

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So we are mounting a UUID.

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I'll tell you later more about UUIDs and labels, but UUIDs and labels will never change, even

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if your device name may change.

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And for that reason, mounting by UUID or by label is standard.

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Now we have the directory on which you want to mount the file system.

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And here we have a couple of mount options.

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Many options can be provided while mounting.

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Here we can see a UMASK and a short name, but other popular options, for instance, are

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no exec, which means that you cannot run any executable files, or no fill, which means

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that if the file system cannot be mounted while booting, your boot procedure won't fill

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because of that.

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You put all of these options in the fourth column and feel free to replace defaults with

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any option that you would like to use.

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After tweaking your ETCFS step, I would always advise to use mount minus A. Mount minus A

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is going to mount everything that hasn't been mounted yet.

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And even stronger, if you reboot, you can immediately verify if everything works out

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all right.

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In real life, I would always advise you to reboot after making changes to ETCFS step

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just to make sure that you didn't make any critical errors, which make that your system

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may not be able to boot anymore.