Vagrant: Support DHCP

[tangrufus]

Allow running multiple Trellis machines at the same time.

Tested with 2 DHCP machines and 1 static IP machine running at the same time. Results:

$ cat /etc/exports
# VAGRANT-BEGIN: 501 78f3bfb6-4ae0-4305-b4a3-8cd68040aa6b
"/Users/me/Code/siteA/bedrock" 172.28.128.3 -alldirs -mapall=501:20
"/Users/me/Code/siteA/trellis" 172.28.128.3 -alldirs -mapall=501:20
# VAGRANT-END: 501 78f3bfb6-4ae0-4305-b4a3-8cd68040aa6b
# VAGRANT-BEGIN: 501 2bf7c671-523e-4ca5-9a81-e85797428609
"/Users/me/Code/siteB/bedrock" 172.28.128.4 -alldirs -mapall=501:20
"/Users/me/Code/siteB/trellis" 172.28.128.4 -alldirs -mapall=501:20
# VAGRANT-END: 501 2bf7c671-523e-4ca5-9a81-e85797428609
# VAGRANT-BEGIN: 501 8dafbb55-1263-4829-90e2-b76fb68323c0
"/Users/me/Code/siteC/site" 192.168.50.5 -alldirs -mapall=501:20
"/Users/me/Code/siteC/trellis" 192.168.50.5 -alldirs -mapall=501:20
# VAGRANT-END: 501 8dafbb55-1263-4829-90e2-b76fb68323c0

$ cat /etc/hosts
...
## vagrant-hostmanager-start id: 95b74937-d48d-468e-850a-ce2664ad1ea7
172.28.128.3	www.typist.dev
172.28.128.3	typist.dev
## vagrant-hostmanager-end

## vagrant-hostmanager-start id: 3fa4d5c6-050d-4545-bc5c-e4db40ec516c
172.28.128.4	ww2.typist.dev
172.28.128.4	ww3.typist.dev
## vagrant-hostmanager-end

## vagrant-hostmanager-start id: 5695f53b-c08e-46be-9d1f-dd08d9cc2842
192.168.50.5	example.dev
192.168.50.5	www.example.dev
## vagrant-hostmanager-end

The ip_resolver proc is taken from devopsgroup-io/vagrant-hostmanager#86 (comment)
Related #295 (comment)
Closes #873

[swalkinshaw]

Think we'll probably merge this since it's fairly simple and optional.

[swalkinshaw]

Small thing, but prefix resolving_vm with _ since it's unused

[tangrufus]

Done

[swalkinshaw]

We may even want to make dhcp the default. Seems simpler?

[tangrufus]

👍 for default

However, if you already have a VM with static IP (running / poweroff doesn't matter), you need $ vagrant destroy before switching to DHCP.

[swalkinshaw]

I think just vagrant reload works?

[tangrufus]

I had trouble with vagrant reload.
But, it could cause by vagrant-triggers, didn't investigate.

[oxyc]

I had trouble with vagrant reload.

I tested this over at Drupal VM and same happened for me if you're referring to a mount.nfs: access denied by server while mounting ... error @tangrufus? vagrant halt; vagrant up fixed it though.

[tangrufus]

I got more errors besides mount.nfs: access denied by server while mounting .... I guess they were from one of my vagrant plugins.

Just curious: Do you work while travelling, @oxyc? I found it extremely hard to stay in front of the computer when everyone else in the hostel went out for sun and beach.

[oxyc]

For reference the plugins I had were vagrant-vbguest and vagrant-hostmanager. Guess it might be triggers.

@tangrufus Nah I never liked mixing work and travel, wouldn't do either at full capacity. I usually travel 4-6 months until I get sick of it, then find a place to work for 6-8 months until I miss it again, and repeat. Also I like signing off so I don't want to bring my laptop.