yum install devtoolset-9-gcc*
scl enable devtoolset-9 bash
yum install librbd1-devel
yum install librados2-devel
yum install python-rados

g++ example1.cpp -lrados -o example

yum install libcephfs-devel

g++ -o cephfs_example1 cephfs_example1.cpp -lcephfs