Does .ebextensions or requirements.txt run first in Elastic Beanstalk

Question

the .config file in .ebextensions or requirements.txt runs first?

I want to install psycopg2 present in requirements.txt for that, I need to install postgresql-devel , python-devel packages installed first.

When I create my config settings like

requirements.txt

psycopg2

.ebextensions/mysite.config

packages:
  yum:
    gcc: []
    python-devel: []
    postgresql-devel: []

1. From the logs, I observed that, requirements.txt executed first, thus raising errors as prerequisites are not installed.

2. yum is raising postgresql-devel is not found in packages.

How do I fix these? Where I am going wrong?

Answer 1

I was having the same error and got it to work specifying a version

packages:
  yum:
    libxslt-devel: ''
    postgresql93-devel: []