You can set it with "juju model-defaults" instead of "juju model-config".
That should set the new configuration for the next model being created.

I'll dig into the rest when I get a chance.


On Sat, Apr 7, 2018 at 11:14 AM, Gregory Van Seghbroeck <
<email address hidden>> wrote:

> Hi John,
>
> I didn't specifically took any action w.r.t. setting up Fan, it came for
> free. Even more, when bootstrapping a new GCE controller, I set model-
> defaults of fan-config="" and container-networking-method=local.
> However, to my surprise, these defaults always got ignored when adding a
> new model. Specifically setting the configs during model creation did
> the trick, but there we have another problem. I need to be able to do
> this from libjuju and as it looks like it, I cannot set empty configs
> during model creation. So back to square 0, but that's something for
> another feature request. Long story short, it looks like Fan comes all
> automatically.
>
> For now I rather have it not set on my system, since I'm not planning to
> use LXD containers in these deployments. But I guess this is behavior
> not specific to the charms I use and at some point people (me included)
> will want to try Fan and have the correct info when requesting the
> private IP address.
>
> Here's some output from ip commands:
> ```
> ubuntu@juju-ae73d8-0:~$ ip -all address
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
> default 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
>     inet6 ::1/128 scope host
>        valid_lft forever preferred_lft forever
> 2: ens4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1460 qdisc mq state UP
> group default qlen 1000
>     link/ether 42:01:0a:84:00:02 brd ff:ff:ff:ff:ff:ff
>     inet 10.132.0.2/32 brd 10.132.0.2 scope global ens4
>        valid_lft forever preferred_lft forever
>     inet6 fe80::4001:aff:fe84:2/64 scope link
>        valid_lft forever preferred_lft forever
> 3: lxdbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
> UNKNOWN group default qlen 1000
>     link/ether fe:01:27:c3:1d:33 brd ff:ff:ff:ff:ff:ff
>     inet6 fe80::fc01:27ff:fec3:1d33/64 scope link
>        valid_lft forever preferred_lft forever
>     inet6 fe80::1/64 scope link
>        valid_lft forever preferred_lft forever
> 4: fan-252: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1410 qdisc noqueue
> state UP group default qlen 1000
>     link/ether 0e:f2:97:86:25:aa brd ff:ff:ff:ff:ff:ff
>     inet 252.0.32.1/8 scope global fan-252
>        valid_lft forever preferred_lft forever
>     inet6 fe80::cf2:97ff:fe86:25aa/64 scope link
>        valid_lft forever preferred_lft forever
> 5: ftun0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1410 qdisc noqueue master
> fan-252 state UNKNOWN group default qlen 1000
>     link/ether 0e:f2:97:86:25:aa brd ff:ff:ff:ff:ff:ff
>     inet6 fe80::cf2:97ff:fe86:25aa/64 scope link
>        valid_lft forever preferred_lft forever
> ubuntu@juju-ae73d8-0:~$ ip -all route
> default via 10.132.0.1 dev ens4
> 10.132.0.1 dev ens4  scope link
> 252.0.0.0/8 dev fan-252  proto kernel  scope link  src 252.0.32.1
> ```
>
> And from ifconfig, to be complete:
> ```
> ubuntu@juju-ae73d8-0:~$ ifconfig
> ens4      Link encap:Ethernet  HWaddr 42:01:0a:84:00:02
>           inet addr:10.132.0.2  Bcast:10.132.0.2  Mask:255.255.255.255
>           inet6 addr: fe80::4001:aff:fe84:2/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1460  Metric:1
>           RX packets:322544 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:307338 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:256913017 (256.9 MB)  TX bytes:35581372 (35.5 MB)
>
> fan-252   Link encap:Ethernet  HWaddr 0e:f2:97:86:25:aa
>           inet addr:252.0.32.1  Bcast:0.0.0.0  Mask:255.0.0.0
>           inet6 addr: fe80::cf2:97ff:fe86:25aa/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1410  Metric:1
>           RX packets:151259 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:151385 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:8976859 (8.9 MB)  TX bytes:8960707 (8.9 MB)
>
> ftun0     Link encap:Ethernet  HWaddr 0e:f2:97:86:25:aa
>           inet6 addr: fe80::cf2:97ff:fe86:25aa/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1410  Metric:1
>           RX packets:151353 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:151374 errors:0 dropped:20 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:8981747 (8.9 MB)  TX bytes:6840565 (6.8 MB)
>
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:65536  Metric:1
>           RX packets:8 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:400 (400.0 B)  TX bytes:400 (400.0 B)
>
> lxdbr0    Link encap:Ethernet  HWaddr fe:01:27:c3:1d:33
>           inet6 addr: fe80::1/64 Scope:Link
>           inet6 addr: fe80::fc01:27ff:fec3:1d33/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:0 (0.0 B)  TX bytes:540 (540.0 B)
> ```
>
> Hope this helps,
> Gregory
>
> --
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> https://bugs.launchpad.net/bugs/1761838
>
> Title:
>   On GCE (Juju 2.3.5) when requesting the private IP address of a unit,
>   I always get the FAN IP address.
>
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