Ceph

When a hostname is specified, and it has an A and AAAA record, only the ipv4 address is tried.

If this fails, the ipv6 address should be tried instead. Wido provided a test program:

    root@stack01:~# ./rados_over_ipv6
    server name not found: ?.F? (Success)
    rados_connect failed: -22root@stack01:~# c^C
    root@stack01:~# cat rados_over_ipv6.c
    #include <stdio.h>
    #include "rados/librados.h" 

    int main(void) {

            rados_t cluster;

            int r;

            r = rados_create(&cluster, "admin");
            if (r < 0) {
                    printf("rados_create failed: %d", r);
                    return -1;
            }

            //rados_conf_set(cluster, "auth_supported", "cephx");
            rados_conf_set(cluster, "mon_host", "monitor.ceph.widodh.nl");
            //rados_conf_set(cluster, "keyring", "/etc/ceph/keyring.bin");

            r = rados_connect(cluster);
            if (r < 0) {
                    printf("rados_connect failed: %d", r);
                    return -2;
            }

            rados_shutdown(cluster);

    }
    root@stack01:~#