Install the Microsoft repository into your yum configuration:

# curl https://packages.microsoft.com/config/rhel/7/prod.repo > /etc/yum.repos.d/mssql-release.repo

Disable the repository:

vi /etc/yum.repos.d/mssql-release.repo
…
enabled=0
…

Remove the unixODBC packages if applicable:

# yum remove unixODBC-utf16 unixODBC-utf16-devel

Install the driver and command line tools (if wanted):

# yum –enablerepo packages-microsoft-com-prod install msodbcsql17
# yum –enablerepo packages-microsoft-com-prod install mssql-tools

Add the tools directory to your PATH variable as required:

vi ~/.bash_profile ~/.bashrc
…
export PATH=”$PATH:/opt/mssql-tools/bin”
..

Add the tools to your current session:

export PATH=”$PATH:/opt/mssql-tools/bin”

Test with sqlcmd:

sqlcmd -U username -P password -S server -d database