As far as what dummy interfaces are used for, they're basically
loopbacks that allow for some better network management/flexibility
(by separating it from the actual system loopback).
On Mon, Oct 26, 2020 at 6:26 PM Strahil Nikolov via CentOS
<centos@xxxxxxxxxx> wrote:
>
> Have you tried to use NetworkManager ?
> After all ,anything network related should be done by it.
>
> [root@system ~]# nmcli connection add con-name dummy0 ifname dummy0 type dummy
> Connection 'dummy0' (9fdd74fa-c143-4991-9bac-0e542704ac89) successfully added.
>
> [root@system ~]# reboot
> Shared connection to glustera closed.
>
>
> [root@system ~]# uptime
> 03:23:44 up 0 min, 1 user, load average: 1,57, 0,48, 0,17
> [root@glustera ~]# nmcli connection show
> NAME UUID TYPE DEVICE
> dummy0 9fdd74fa-c143-4991-9bac-0e542704ac89 dummy dummy0
>
>
> [root@system ~]# ip a s dummy0
> 3: dummy0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
> link/ether ce:c9:83:97:10:ee brd ff:ff:ff:ff:ff:ff
> inet6 fe80::599:a978:9457:df10/64 scope link noprefixroute
> valid_lft forever preferred_lft forever
>
> P.S.: This is the first time I hear about dummy interfaces. What are those used for ?
>
> Best Regards,
> Strahil Nikolov
>
>
>
>
>
>
>
>
>
> В вторник, 27 октомври 2020 г., 02:42:06 Гринуич+2, Frank Even <lists+centos.org@xxxxxxxxxxxx> написа:
>
>
>
>
>
> Anyone have any ideas? It's rather annoying that I can't get these to
> persist across reboots without using some kind of helper script.
>
> On Fri, Oct 16, 2020 at 6:37 AM Frank Even
> <lists+centos.org@xxxxxxxxxxxx> wrote:
> >
> > Hello all, hoping someone can help me out here.
> >
> > I cannot get dummy interfaces on a new Cent8 build to persist across reboots.
> >
> > On Cent7 - this is the process I use:
> >
> > Create Dummies:
> > # cat /etc/modules-load.d/dummy.conf
> > dummy
> > # cat /etc/modprobe.d/dummyopts.conf
> > options dummy numdummies=4
> > # ip link add dummy0 type dummy
> > ## - repeating a/ ascending dummyN adapters for as many needed
> > # service network start
> > # dracut -f
> >
> > Now this was different than even how 6 handled it, forget how I
> > finally dug that up (possible I even asked here). I've applied this
> > same configuration to a Cent8 box I'm trying to stand up and it all
> > appears to work fine, but unlike the Cent7 boxes, when the Cent8 box
> > comes back up, all the dummy adapters are missing. I've been
> > searching all over trying to find some documentation on this to no
> > avail. I'm hoping someone has some suggestions here to help out.
> >
> > Thanks,
> > Frank
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