[fix][misc] Add proper nslookup (included in bind-tools) to docker image

[lhotari]

Fixes: #22877

Motivation

The default nslookup in Alpine is based on busybox and it isn't compatible with Kubernetes. See #22877 for more details.

Modifications

Install bind-tools package to get proper nslookup

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

[heesung-sn]

I assume bind-utils is light-weight.

[lhotari]

I assume bind-utils is light-weight.

It is. The downside is that it could contain vulnerabilities which show up in scanning. However there doesn't seem to be an alternative for backwards compatibility with Pulsar helm charts that use nslookup to check when another component is available.

[lhotari]

The correct package name in Alpine is bind-tools. Testing it soon with Apache Pulsar Helm chart.

[merlimat]

I assume bind-utils is light-weight.

It is. The downside is that it could contain vulnerabilities which show up in scanning. However there doesn't seem to be an alternative for backwards compatibility with Pulsar helm charts that use nslookup to check when another component is available.

After we do the RUN apk upgrade --no-cache step, it's picking up the latest version, with no vulnerabilities

[lhotari]

Pulsar cluster gets initialized properly with Apache Pulsar Helm chart when using nslookup from bind-tools package. Here's the way I tested: https://github.com/lhotari/pulsar-helm-chart/pull/10/files#diff-f34da55ca08f1a30591d8b0b3e885bcc678537b2a9a4aadea4f190806b374ddcR3 . Pushed the image to https://hub.docker.com/r/lhotari/pulsar-all/tags (docker pull lhotari/pulsar-all:3.3.0-nslookup)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.29%. Comparing base (bbc6224) to head (9147edf).
Report is 363 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #22878      +/-   ##
============================================
- Coverage     73.57%   73.29%   -0.28%     
- Complexity    32624    32702      +78     
============================================
  Files          1877     1889      +12     
  Lines        139502   141885    +2383     
  Branches      15299    15565     +266     
============================================
+ Hits         102638   103997    +1359     
- Misses        28908    29877     +969     
- Partials       7956     8011      +55     

Flag	Coverage Δ
inttests	27.20% <ø> (+2.62%)	⬆️
systests	24.70% <ø> (+0.37%)	⬆️
unittests	72.33% <ø> (-0.51%)	⬇️

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see 392 files with indirect coverage changes