digraph G {
    node [ shape=box ]
    #rankdir=LR;

    label="
    DNS lookups at ungleich.ch\n
    No systemd, no network manager, no resolvconf, no systemd-resolved."

    start [ shape=Mdiamond ] ;
    resolvconf [ label="/etc/resolv.conf exists?" shape=oval ];
    lookup [ label="Do DNS lookup" shape=doubleoctagon ];

    start->resolvconf
    resolvconf->lookup [ label="yes" ];

}