feat: auto detecting local IP to use as hostname

[WenyXu]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Automatically detect the local IP to enable deployment in container environments where pod IPs cannot be obtained.

After enabling this feature, the datanode will report the auto-detected IPs as peer addresses.

mysql> select * from cluster_info;
+---------+-----------+------------------+---------+------------+----------------------------+------------------+-------------+
| peer_id | peer_type | peer_addr        | version | git_commit | start_time                 | uptime           | active_time |
+---------+-----------+------------------+---------+------------+----------------------------+------------------+-------------+
|      -1 | METASRV   | 10.244.0.44:3002 | 0.12.0  | c305b2b4   | 2025-01-08 07:07:42.208000 | 2h 39m 55s 573ms | NULL        |
|       0 | DATANODE  | 10.244.0.47:4001 | 0.12.0  | c305b2b4   | 2025-01-08 07:07:52.415000 | 2h 39m 45s 366ms | 2s 227ms    |
|       1 | DATANODE  | 10.244.0.48:4001 | 0.12.0  | c305b2b4   | 2025-01-08 07:07:52.415000 | 2h 39m 45s 366ms | 2s 741ms    |
|      -1 | FRONTEND  | 127.0.0.1:4001   | 0.12.0  | c305b2b4   | 2025-01-08 07:07:57.806000 | 2h 39m 39s 975ms | 3s 380ms    |
+---------+-----------+------------------+---------+------------+----------------------------+------------------+-------------+
6 rows in set (0.01 sec)

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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[sunng87]

We don't need to create a new configuration item for this. Just make hostname an optional field and use local-ip-address when it's not provided.

But what if there are multiple network interfaces?

[v0y4g3r]

We don't need to create a new configuration item for this. Just make hostname an optional field and use local-ip-address when it's not provided.

But what if there are multiple network interfaces?

That crate uses netlink to find out local ip address, so system route table determines which interface to use when multiple interface are present.

[codecov]

Codecov Report

Attention: Patch coverage is 51.80723% with 40 lines in your changes missing coverage. Please review.

Project coverage is 84.11%. Comparing base (c305b2b) to head (3fa5248).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5314      +/-   ##
==========================================
- Coverage   84.14%   84.11%   -0.04%     
==========================================
  Files        1200     1202       +2     
  Lines      225414   226112     +698     
==========================================
+ Hits       189682   190187     +505     
- Misses      35732    35925     +193     

[v0y4g3r]

LGTM

[fengjiachun]

LGTM