Using module load command to switch environment for an application on CentOS 7

Refer to

• Software modules on CentOS 7
• Environment Modules – A Great Tool for Clusters
• Shell into modulefile 
  
  

For HPC:

yum install lmod-ohpc-8.1.18-6.1.ohpc.1.3.9.x86_64
# shell file into modulefile
/opt/ohpc/admin/lmod/8.1.18/libexec/sh_to_modulefile example.sh

Install it:

yum install environment-modules -y; bash

Examples:

root@beta  ## > cd /usr/share/Modules/modulefiles
root@beta ## > mkdir compilers
root@beta ## > cp modules compilers/gcc-4.8.5

"Then we edit the module info (compilers/gcc-4.8.5). The modified version looks like this:"

#%Module1.0###################################
##
## modules compilers/gcc-4.8.5
##
## modulefiles/compilers/gcc-4.8.5. Sample gcc module
##
proc ModulesHelp { } {
 global version modroot

puts stderr "compilers/gcc-4.8.5 - sets the Environment for 
      GCC 4.8.5 "
}

module-whatis "Sets the environment for using 
    gcc-4.8.5 (C, Fortran)"

# for Tcl script use only
set topdir /usr/bin/gcc
set version 4.8.5
set sys linux86

setenv CC $topdir/bin/gcc
setenv GCC $topdir/bin/gcc
setenv FC $topdir/bin/gfortran
setenv F77 $topdir/bin/gfortran
setenv F90 $topdir/bin/gfortran
prepend-path PATH $topdir/include
prepend-path PATH $topdir/bin
prepend-path MANPATH $topdir/man
prepend-path LD_LIBRARY_PATH $topdir/lib

Test it:

  988  module avail
  989  module help compilers/gcc-4.8.5
  990  cat compilers/gcc-4.8.5
  991  module whatis compilers/gcc-4.8.5
  992  module load compilers/gcc-4.8.5
  993  module list
  994  env
  995  env | more
  996  /usr/bin/gcc/
  997  env
  998  module unload compilers/gcc-4.8.5
  999  env