How do i list the extra packages that can be installed on amazon linux 2

petulia3478

These are extra package available to Amazon Linux 2, if you enable them, they will be availabe via yum or dnf installers. It adds a yum repo.

$ amazon-linux-extras list
   0  ansible2   disabled  [ =2.4.2 ]
   1  emacs   disabled  [ =25.3 ]
   2  memcached1.5   disabled  [ =1.5.1 ]
   3  nginx1.12   disabled  [ =1.12.2 ]
   4  postgresql9.6   disabled  [ =9.6.6 ]
   5  python3   disabled  [ =3.6.2 ]
   6  redis4.0   disabled  [ =4.0.5 ]
   7  R3.4   disabled  [ =3.4.3 ]
   8  rust1   disabled  [ =1.22.1 ]
   9  vim   disabled  [ =8.0 ]
  10  golang1.9   disabled  [ =1.9.2 ]
  11  ruby2.4   disabled  [ =2.4.2 ]
  12  nano   disabled  [ =2.9.1 ]
  13  php7.2   disabled  [ =7.2.0 ]
  14  lamp-mariadb10.2-php7.2   disabled  [ =10.2.10_7.2.0 ]