[doc] Update install document for installing Python 2.6 on OS 6.x series
@@ -83,6 +83,59 @@ Required for MacOS 10.11+
export LDFLAGS=-L/usr/local/opt/openssl/lib && export CPPFLAGS=-I/usr/local/opt/openssl/include
+### Centos/Oracle/RedHat 6.x
+
+Installing Python 2.7:
+
+#### CentOS 6.8/6.9 OS
+
+Check your OS Version:
+
+ cat /etc/redhat-release
+
+Make sure "/etc/redhat-release" contains "CentOS 6.8 or 6.9" version. These instructions are tested on CentOS 6.8 and 6.9 versions only. It may or may not work on previous CentOS 6 series OS.
+
+ yum install -y centos-release-SCL
+ yum install -y scl-utils
+ yum install -y python27
+
+#### RedHat 6.8/6.9 OS
+
+Check your OS Version
+
+ cat /etc/redhat-release
+
+Make sure `/etc/redhat-release` contains "RedHat 6.8 or 6.9" version. These instructions are tested on RedHat 6.8 and 6.9 versions only. It may or may not work on previous RedHat 6 series OS.
+
+ wget http://mirror.infra.cloudera.com/centos/6/extras/x86_64/Packages/centos-release-scl-rh-2-3.el6.centos.noarch.rpm
+ rpm -ivh centos-release-scl-rh-2-3.el6.centos.noarch.rpm
+ yum install -y scl-utils
+ yum install -y python27
+
+#### Oracle 6.8/6.9 OS
+
+Check your OS Version
+
+ cat /etc/redhat-release
+
+Make sure `/etc/redhat-release` contains "Oracle 6.8 or 6.9" version. These instructions are tested on Oracle 6.8 and 6.9 versions only. It may or may not work on previous Oracle 6 series OS.
+
+ wget -O /etc/yum.repos.d/public-yum-ol6.repo http://yum.oracle.com/public-yum-ol6.repo
+
+Set the value of the enabled parameter for the software_collections repository to 1: for file `/etc/yum.repos.d/public-yum-ol6.repo`
+
+ [ol6_software_collections]
+ name=Software Collection Library release 3.0 packages for Oracle Linux 6 (x86_64)
+ baseurl=http://yum.oracle.com/repo/OracleLinux/OL6/SoftwareCollections/x86_64/
+ gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
+ gpgcheck=1
+ enabled=1
+
+for more details, refer to this link: [https://docs.oracle.com/cd/E37670_01/E59096/html/section_e3v_nbl_cr.html](https://docs.oracle.com/cd/E37670_01/E59096/html/section_e3v_nbl_cr.html)
+
+ yum install -y scl-utils
+ yum install -y python27
+
#### Install Oracle Instant Client
