[fix][build] Fix ps command

[nodece]

Motivation

58a588ac742d:/pulsar# ./bin/pulsar-daemon start zookeeper
doing start zookeeper ...
starting zookeeper, logging to /pulsar/logs/pulsar-zookeeper-58a588ac742d.log
Note: Set immediateFlush to true in conf/log4j2.yaml will guarantee the logging event is flushing to disk immediately. The default behavior is switched off due to performance considerations.
ps: unrecognized option: p
BusyBox v1.36.1 (2023-11-07 18:53:09 UTC) multi-call binary.

Usage: ps [-o COL1,COL2=HEADER] [-T]

Show list of processes

	-o COL1,COL2=HEADER	Select columns for display
	-T

ps command doesn't include -p option.

Modifications

• Add procps package to fix the ps command
• Set the PULSAR_PID_DIR environment variable, and default to /pulsar/logs in the docker environment.

Documentation

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

[nodece]

I recommend to use the bin/pulsar-daemon instead of supervisord in the integration tests, which can help us to find the pulsar-daemon error.

[lhotari]

I don't think that bin directory should be writable. We need to modify the scripts so that it writes in some other directory.

[nodece]

What do you think about writing the pid file to data directory?

[lhotari]

What do you think about writing the pid file to data directory?

It's better, but just wondering if the script pulsar-daemon should be completely removed.

[lhotari]

The default could be the logs directory and letting the user override it with some env variable.

[nodece]

What do you think about writing the pid file to data directory?

It's better, but just wondering if the script pulsar-daemon should be completely removed.

+1, I only recommend keeping the bin/pulsar.

The default could be the logs directory.

Write it to logs dir is a good idea.

letting the user override it with some env variable.

Example: PULSAR_PID_DIR?

[nodece]

The PULSAR_PID_DIR has been defined, we can remove the pulsar-daemon from the docker image, but we can keep this command in the codebase, what do you think?

[lhotari]

The PULSAR_PID_DIR has been defined, we can remove the pulsar-daemon from the docker image, but we can keep this command in the codebase, what do you think?

@nodece I don't see the changes. I guess it's fine to keep pulsar-daemon as long as we don't need to make bin writable for using it.

[lhotari]

LGTM