fix: tiup supports define root_url and enable anonymous in grafana.ini

[mianhk]

What problem does this PR solve?

fix: #849

What is changed and how it works?

1. You can configure Grafana to run behind a reverse proxy.
   reference: https://grafana.com/tutorials/run-grafana-behind-a-proxy/#1
2. You can set grafana access anonymous

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

tiup cluster edit-config test_cluster

support config:
- host: 127.0.0.2
  ssh_port: 22
  arch: amd64
  os: linux
  username: admin
  password: admin
  anonymous_enable: true
  root_url: /tidb/grafana/test-cluster
  domain: example.com

Then, you can get a grafana.ini like:

[auth.anonymous]
enabled = true
# The full public facing url
[server]
domain = example.com
...
root_url = /tidb/grafana/test-cluster
server_from_sub_path = true

• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[CLAassistant]

All committers have signed the CLA.

[codecov-io]

Codecov Report

Merging #1085 (8b111b1) into master (09833d6) will decrease coverage by 1.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1085      +/-   ##
==========================================
- Coverage   56.56%   55.42%   -1.15%     
==========================================
  Files         283      283              
  Lines       20016    20025       +9     
==========================================
- Hits        11323    11098     -225     
- Misses       6937     7207     +270     
+ Partials     1756     1720      -36     

Flag	Coverage Δ
cluster	42.66% <100.00%> (-2.44%)	⬇️
dm	24.90% <100.00%> (+0.04%)	⬆️
integrate	49.82% <100.00%> (-1.21%)	⬇️
playground	20.91% <ø> (ø)
tiup	16.37% <10.00%> (-0.02%)	⬇️
unittest	22.70% <25.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/cluster/embed/autogen_pkger.go	100.00% <100.00%> (ø)
pkg/cluster/spec/grafana.go	68.75% <100.00%> (+0.75%)	⬆️
pkg/cluster/template/config/grafana.go	75.00% <100.00%> (+5.76%)	⬆️
components/cluster/command/edit_config.go	33.33% <0.00%> (-44.45%)	⬇️
components/cluster/command/upgrade.go	37.50% <0.00%> (-37.50%)	⬇️
pkg/cluster/api/pdapi.go	30.28% <0.00%> (-28.40%)	⬇️
pkg/cluster/operation/upgrade.go	50.84% <0.00%> (-22.04%)	⬇️
pkg/cluster/spec/tikv.go	37.75% <0.00%> (-18.88%)	⬇️
pkg/utils/retry.go	47.36% <0.00%> (-18.43%)	⬇️
pkg/cluster/spec/pd.go	56.02% <0.00%> (-12.05%)	⬇️
... and 10 more

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[lucklove]

In https://grafana.com/tutorials/run-grafana-behind-a-proxy/#1

It says:

When running Grafana behind a proxy, you need to configure the domain name to let Grafana know how to render links and redirects correctly.

And the final example is like:

[server]
domain = example.com
root_url = %(protocol)s://%(domain)s:%(http_port)s/grafana/
serve_from_sub_path = true

So I think maybe you forget to set the domain (by default, it's the IP address).

I suggest that you can add a Domain field and parse the domain from the root_url, if the root_url is not set, set Domain to the IP address.

[mianhk]

In https://grafana.com/tutorials/run-grafana-behind-a-proxy/#1

It says:

When running Grafana behind a proxy, you need to configure the domain name to let Grafana know how to render links and redirects correctly.

And the final example is like:

[server]
domain = example.com
root_url = %(protocol)s://%(domain)s:%(http_port)s/grafana/
serve_from_sub_path = true

So I think maybe you forget to set the domain (by default, it's the IP address).

I suggest that you can add a Domain field and parse the domain from the root_url, if the root_url is not set, set Domain to the IP address.

OK,I add domain field parsed from domain if root_url is set or not cause someone may only set domain.

[lucklove]

/lgtm

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• lucklove

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[lucklove]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 0d46b5e

[ti-chi-bot]

@mianhk: Your PR has out-of-dated, I have automatically updated it for you.

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