provide custom grafana.ini for anonymous access in sensu-go vagrant

[hillaryfraley]

@cwjohnston I'm not sure if this is a problem due to this PR or something else.

When I get to lesson 3, my output isn't matching what's shown in the lesson steps. Here's what I get in terminal:

[sensu_go_sandbox]$ sudo systemctl restart sensu-agent
[sensu_go_sandbox]$ sudo yum install -y nginx && sudo systemctl start nginx
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: repos-va.psychz.net
 * extras: centos.mirrors.tds.net
 * updates: ftp.usf.edu
sensu_stable/x86_64/signature                            |  833 B     00:00     
sensu_stable/x86_64/signature                            | 1.0 kB     00:00 !!! 
sensu_stable-source/signature                            |  819 B     00:00     
sensu_stable-source/signature                            |  951 B     00:00 !!! 
No package nginx available.
Error: Nothing to do
[sensu_go_sandbox]$ curl -I http://localhost:80
curl: (7) Failed connect to localhost:80; Connection refused

Up to this point, everything works exactly as shown in the lessons. Maybe I'm doing something incorrectly?

[cwjohnston]

@hillaryfraley I believe this is unrelated to this PR. I think these two lines indicate the immediate problem:

No package nginx available. Error: Nothing to do

For some reason the nginx package is not available in the VM's currently configured package repositories, and therefore the nginx service isn't available to answer the request sent by curl.

[cwjohnston]

@hillaryfraley what do you see when you run cat /etc/redhat-release ?

On my side I see CentOS Linux release 7.5.1804 (Core). I can see that the Vagrantfile uses bento/centos7 as the base image, so I'm guessing you might have a newer CentOS (e.g. 7.7) which would potentially explain what you're seeing.

[cwjohnston]

@rgeniesse reports the same here https://github.com/sensu/sensu-docs/pull/1833#discussion_r336302090 on Centos 7.4

[hillaryfraley]

@cwjohnston I see: CentOS Linux release 7.6.1810 (Core)