在CentOS下安装Erlang。在https://www.erlang-solutions.com/downloads/download-erlang-otp的CentOS那一栏：
1. Adding repository entry
wget http://packages.erlang-solutions.com/erlang-solutions-1.0-1.noarch.rpm
rpm -Uvh erlang-solutions-1.0-1.noarch.rpm
2. Installing Erlang
sudo yum install erlang