Ansible AWX使用Docker容器安装，并在启动时自动安装PostgreSQL。在AWX Docker容器的“Dockerfile”文件中，可以看到以下代码示例：

RUN yum install -y epel-release
&& yum install -y --enablerepo=epel $(cat "${tmp}/${BUILD_AWX_REQ}")
...

Install PostgreSQL

RUN touch /etc/yum.repos.d/pgdg.repo
&& echo "[pgdg$(rpm -E %dist)]" >> /etc/yum.repos.d/pgdg.repo
&& echo "name=PostgreSQL $PG_MAJOR $(rpm -E %dist)" >> /etc/yum.repos.d/pgdg.repo
&& echo "baseurl=https://download.postgresql.org/pub/repos/yum/$PG_MAJOR/redhat/rhel-7-x86_64" >> /etc/yum.repos.d/pgdg.repo
&& echo "enabled=1" >> /etc/yum.repos.d/pgdg.repo
&& echo "gpgcheck=1" >> /etc/yum.repos.d/pgdg.repo
&& echo "gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-PGDG-$PG_MAJOR" >> /etc/yum.repos.d/pgdg.repo
&& yum install -y postgresql-server gettext
&& echo 'LC_ALL=en_US.UTF-8' >> /etc/environment
&& source /etc/environment
...

从上述代码示例中可以看到，在AWX Docker容器中，“postgreSQL”将在Docker容器启动时自动安装。