update openssl
http://www.voidcn.com/article/p-afycxhtw-bpb.html
install vsftpd
https://www.liquidweb.com/kb/how-to-install-and-configure-vsftpd-on-centos-7/
fix vsftpd
Fixing 500 OOPS: vsftpd: refusing to run with writable root inside chroot ()
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update openssl
http://www.voidcn.com/article/p-afycxhtw-bpb.html
install vsftpd
https://www.liquidweb.com/kb/how-to-install-and-configure-vsftpd-on-centos-7/
fix vsftpd
Fixing 500 OOPS: vsftpd: refusing to run with writable root inside chroot ()