I was testing ceph in a centos 7 VM, just so I could support someone
that wants to use CentOS 7, and I ran into a problem... What am I doing
wrong?

First I tried just without any ipv6 changes, and the eth0 had an ipv6
address, but it still didn't work. I think it looked the same but didn't
save the output.


Then I disabled IPv6 via sysctls, rebooted, and tried again:

> root@centos7-ceph:~ # /usr/bin/ceph-mon -f --cluster ceph --id centos7-ceph 
> --setuser ceph --setgroup ceph
> 2017-05-06 07:13:34.801245 7feea4cb7600 -1 accepter.accepter.bind unable to 
> bind to [fe80::4c30:18ff:fe6c:7b2b]:6789: (22) Invalid argument
> 2017-05-06 07:13:34.801278 7feea4cb7600 -1 accepter.accepter.bind was unable 
> to bind. Trying again in 5 seconds 
> ^C
> root@centos7-ceph:~ # ip a
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1000
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>     inet 127.0.0.1/8 scope host lo
>        valid_lft forever preferred_lft forever
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP 
> qlen 1000
>     link/ether 4e:30:18:6c:7b:2b brd ff:ff:ff:ff:ff:ff
>     inet 10.3.0.89/16 brd 10.3.255.255 scope global eth0
>        valid_lft forever preferred_lft forever
> root@centos7-ceph:~ # ip l
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode 
> DEFAULT qlen 1000
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP 
> mode DEFAULT qlen 1000
>     link/ether 4e:30:18:6c:7b:2b brd ff:ff:ff:ff:ff:ff
> root@centos7-ceph:~ # sysctl -a | grep ipv6.*abled
> sysctl: reading key "net.ipv6.conf.all.stable_secret"
> net.ipv6.conf.all.seg6_enabled = 0
> sysctl: reading key "net.ipv6.conf.default.stable_secret"
> net.ipv6.conf.default.seg6_enabled = 0
> sysctl: reading key "net.ipv6.conf.eth0.stable_secret"
> net.ipv6.conf.eth0.seg6_enabled = 0
> sysctl: reading key "net.ipv6.conf.lo.stable_secret"                          
>                                                                               
>                                  
> net.ipv6.conf.lo.seg6_enabled = 0

Then I tried disabling ipv6 via the kernel cmdline, and also left the
sysctls the way they were:

> root@centos7-ceph:~ # /usr/bin/ceph-mon -f --cluster ceph --id centos7-ceph 
> --setuser ceph --setgroup ceph
> 2017-05-06 07:17:29.890929 7fc2bec5b600 -1 accepter.accepter.bind unable to 
> create socket: (97) Address family not supported by protocol
> 2017-05-06 07:17:29.890963 7fc2bec5b600 -1 unable to bind monitor to 
> [fe80::4c30:18ff:fe6c:7b2b]:6789/0

Also I tried config:
>
> ms bind ipv6 = false
>

Which didn't do anything.

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