WEBVTT

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Hey, in this video,
we're going to walk through

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the practice test
for labels and selectors.

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The question is
we have deployed a number of PODs,

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they are labelled with a tier, env and bu.

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How many PODs exist
in the dev environment?

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We have to use selectors.

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First, let's do a get PODs

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and we see
that there are a number of PODs.

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Now we've got to filter it

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and identify the PODs
that are in the dev environment.

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I'm assuming env is for environment.

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That's the label and this is the key,
and this is the value.

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If we have to find PODs
using the selector,

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and then we'll say env equals dev.

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We see that these are the PODs
in the dev environment.

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That's, one, two, three,
four, five, six, seven.

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Seven of them.

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Now, let's say,
since there are just seven,

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it's easy for us to just count,

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but let's say there are a lot of them

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now where it becomes
difficult to count mentally.

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One thing you could do
is just do a word count.

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You could do a wc -l.

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Now, the problem with this is
this also counts this top line,

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which is the header.

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There is a way to print this
without the headers,

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and that's using the no headers option.

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When you run that, you just get
the output without the header,

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then we can do a word count on that,

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and that's seven.

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Seven is the answer here.

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The next question is, how many PODs
are in the finance business unit?

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We saw that

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the label key is bu is for business unit,

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and the business unit
we are looking at finance.

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We'll just use same command for this

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and this time it's six.

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How many objects
are in the prod environment,

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including PODs, ReplicaSets,
and any other objects?

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Let's use the same command

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and change the labels.

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The environment is prod

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and now, we're only listing the PODs.

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To list all objects,

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what you can do is give all lists of PODs.

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List all the objects in that namespace.

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Here we have PODs, here we have service
and we have ReplicaSets.

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If you count this, let's do a word count.

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That's number seven.

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There are seven objects.

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Then the next question
is to identify the POD,

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which is part of the prod environment,
the finance BU,

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and the front end tier,
so one that has all of it.

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The environment is prod,

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then we can just add additional labels
and separated by a comma.

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BU equals finance

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and tier is front end.

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That happens to be this particular POD,

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which starts with zzxdf,
is this one right here.

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The final question
is about, again, labels.

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There's a file called
ReplicaSet definition file.

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The request is to create the ReplicaSet,

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but there's an issue with it,
so we've got to fix it.

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Let's try creating it.

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It says the ReplicaSet is invalid.

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Invalid value,
selector does not match template labels.

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Selector is this and template labels.

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This is template
and template labels is this.

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The error message is that
this does not match this.

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We know that for ReplicaSet
to manage the POD

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so this is basically the POD definition.

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The ReplicaSet
needs to have these to match,

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otherwise, it won't be able
to manage the POD.

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That's the validation error here.

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We're going to fix this
by changing this to the value below.

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Save that,

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and let's create the ReplicaSet,

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and it's created.

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Let's verify.

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Patient.

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Yes, that's working.

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Okay, that's the end of this lab.