tmate.io is great terminal sharing app, you can think of it as Teamviewer for ssh.
To compile it on CentOS 7 follow these steps:
yum install git cmake ruby zlib-devel openssl-devel libevent-devel ncurses-devel yum group install "Development Tools"
Then grab tmate source files and compile them:
git clone https://github.com/nviennot/tmate.git cd tmate/ ./autogen.sh ./configure make
And that is it, enjoy.