https://www.oracle.com/technetwork/articles/servers-storage-admin/ginnydbinstallonlinux-488779.html
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Red Hat Enterprise Linux 7 or Compatible
# wget https://yum.oracle.com/RPM-GPG-KEY-oracle-ol7 -O /etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
# gpg –quiet –with-fingerprint /etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
pub 2048R/EC551F03 2010-07-01 Oracle OSS group (Open Source Software group) <build@oss.oracle.com>
Key fingerprint = 4214 4123 FECF C55B 9086 313D 72F9 7B74 EC55 1F03
https://oracle-base.com/articles/11g/oracle-db-11gr2-installation-on-oracle-linux-7