For CentOS:

If you want to link cmake3 to cmake, run:

  sudo ln -sf /usr/bin/cmake3 /usr/local/bin/cmake

Make sure that you add /usr/local/lib and /usr/local/lib64 to /etc/ld.so.conf, then run command ldconfig.

If you want to install and use gcc-7 by default, run:

sudo yum install -y centos-release-scl
sudo yum install -y devtoolset-7-toolchain
echo 'source scl_source enable devtoolset-7' >> ~/.bashrc

For RHEL

Use dependency script for CentOS.

If you want to install devtoolset-7:

sudo yum-config-manager --enable rhui-REGION-rhel-server-rhscl
sudo yum install -y devtoolset-7-toolchain

Install Dependencies When you run the README.ubuntu.bash script for dependencies, you will be asked to configure realm for kerberos. You can enter any realm, since this is just for testing, and during testing, it will reconfigure a local server/client. If you want to skip this manual configuration, use: export DEBIAN_FRONTEND=noninteractive
```
  ./README.ubuntu.bash
```
Ubuntu 18.04 and newer should have use gcc 7 or newer, but you can also enable gcc-7 on older versions of Ubuntu:
```
add-apt-repository ppa:ubuntu-toolchain-r/test -y
apt-get update
apt-get install -y gcc-7 g++-7
```

Make sure that you add /usr/local/lib to /etc/ld.so.conf, then run command ldconfig.

Create gpadmin and setup ssh keys Either use:

# Requires gpdb clone to be named gpdb_src
gpdb_src/concourse/scripts/setup_gpadmin_user.bash

to create the gpadmin user and set up keys,

OR

manually create ssh keys so you can do ssh localhost without a password, e.g.,

ssh-keygen
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys

Verify that you can ssh to your machine name without a password
```
 ssh <hostname of your machine>  # e.g., ssh briarwood
```
Set up your system configuration by following the installation guide on docs.greenplum.org