grid-template-rows: repeat (2, 1fr) is not required. Rows are arranged automatically.
If your container has a fixed size, use px size instead of vh. You can also use the calc function.
* { box-sizing: border-box;
}
html,body {
   height: 100%;
   margin: 0;
}
.footer {
   height: 10vh;
   background-color: #eee;
   text-align: center;
}
.wrapper {
   display: grid;
   grid-template-columns: repeat(6, 1fr);
   grid-gap: 1px;
   justify-content: center;
   height: 90vh;
}
.box {
   background-color: #444;
   color: #fff;
   padding: 10px;
   font-size: 12px;
}
    <section class="container">
      <div class="wrapper">
        <div class="box a">A</div><div class="box b">B</div><div class="box c">C</div><div class="box d">D</div>
        <div class="box e">E</div><div class="box f">F</div><div class="box a">A</div><div class="box b">B</div>
        <div class="box c">C</div><div class="box d">D</div><div class="box e">E</div><div class="box f">F</div>
      </div>
    </section>
<footer class="footer">
  footer
</footer>
 
 
If your container has a fixed size, use a px size
Or use Flex:
* { box-sizing: border-box;
}
html,body {
  height: 100%;
  margin: 0;
}
.footer {
  height: 10vh;
  background-color: #eee;
  text-align: center;
}
.wrapper {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  height:90vh;
}
.wrapper > div {
  width: 16.666%;
  text-align: center;
  font-size: 12px;
  line-height: 6;
  border: 1px solid;
  background-color: #444;
}
    <section class="container">
      <div class="wrapper">
        <div class="box a">A</div><div class="box b">B</div><div class="box c">C</div><div class="box d">D</div>
        <div class="box e">E</div><div class="box f">F</div><div class="box a">A</div><div class="box b">B</div>
        <div class="box c">C</div><div class="box d">D</div><div class="box e">E</div><div class="box f">F</div>
      </div>
    </section>
<footer class="footer">
  footer
</footer>
 
 
No footer:
* { box-sizing: border-box;}
html,body {
  height: 100%;
  margin: 0;
}
.container {
  position: relative;
  min-height:100%;
}
.wrapper {
  display: flex;
  flex-wrap: wrap;
  height:100%;
  margin: 0 auto;
  max-height:100%;
  position:absolute;
  top: 0; bottom: 0; left: 0; right: 0;
}
.wrapper > div {
  width: 16.666%;
  text-align: center;
  font-size: 12px;
  line-height: 6;
  border: 1px solid;
  background-color: #444;
}
<section class="container">
  <div class="wrapper">
    <div class="box a">A</div><div class="box b">B</div><div class="box c">C</div><div class="box d">D</div>
    <div class="box e">E</div><div class="box f">F</div><div class="box a">A</div><div class="box b">B</div>
    <div class="box c">C</div><div class="box d">D</div><div class="box e">E</div><div class="box f">F</div>
  </div>
</section>
 
 
example 4: footer and header
* { box-sizing: border-box; }
html,body {
  height: 100%;
  margin: 0;
}
.footer {
  height: 10vh;
  background-color: #eee;
  text-align: center;
  font-size: 4vh;
}
.header {
  height: 10vh;
  background-color: #eee;
  text-align: center;
  font-size: 4vh;
}
.wrapper {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  height:80vh;
}
.wrapper > div {
  width: 16.666%;
  text-align: center;
  border: 1px solid;
  background-color: #444;
}
<div class="header">header</div>
<section class="container">
      <div class="wrapper">
        <div class="box a">A</div><div class="box b">B</div><div class="box c">C</div><div class="box d">D</div>
        <div class="box e">E</div><div class="box f">F</div><div class="box a">A</div><div class="box b">B</div>
        <div class="box c">C</div><div class="box d">D</div><div class="box e">E</div><div class="box f">F</div>
      </div>
</section>
<footer class="footer">
  footer
</footer>
 
 
**example 5: **
* { box-sizing: border-box;}
html,body {  height: 100%;  margin: 0;}
.footer {
  height: 15vh;
  background-color: #eee;
  text-align: center;
}
.header {
  height: 15vh;
  background-color: #eee;
  text-align: center;
  
}
.wrapper {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  height:70vh;
}
.wrapper > div {
  width: 16.666%;
  text-align: center;
  font-size: 12px;
  border: 1px solid;
  background-color: #444;
}
<div class="header">header</div>
<div class="wrap">
<section class="container">
  <div class="wrapper">
    <div class="box a">A</div><div class="box b">B</div><div class="box c">C</div><div class="box d">D</div>
    <div class="box e">E</div><div class="box f">F</div><div class="box a">A</div><div class="box b">B</div>
    <div class="box c">C</div><div class="box d">D</div><div class="box e">E</div><div class="box f">F</div>
  </div>
</section>
</div>
<div class="footer">
      footer
</div>