安装postgresql11 会依赖一些组件
yum install -y gcc gcc-c++ epel-release llvm5.0 llvm5.0-devel clang libicu-devel perl-ExtUtils-Embed readline readline-devel zlib zlib-devel openssl openssl-devel pam-devel libxml2-devel libxslt-devel openldap-devel systemd-devel tcl-devel python-devel
由于centos自带的版本不够高，直接安装postgresql会报错，所以需要给llvm和clang升级
wget http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
yum localinstall epel-release-latest-7.noarch.rpm
yum install llvm5.0 llvm5.0-devel clang