I just tried both the RHEL6 and RHEL7 repos to install ArangoDB 3 on Amazon Linux. Both times I got:
Error: Package: arangodb3-3.0.10-22.1.x86_64 (arangodb) Requires: systemd -- You received this message because you are subscribed to the Google Groups "ArangoDB" group. To unsubscribe from this group and stop receiving emails from it, send an email to arangodb+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.