feat!: add interface report to coder netcheck (#13562)

re: #13327

Adds local interfaces to `coder netcheck` and checks their MTUs for potential problems.

This is mostly relevant for end-user systems where VPNs are common.  We _could_ also add it to coderd healthcheck, but until I see coderd connecting to workspaces over a VPN in the wild, I don't think its worth the UX effort.

Netcheck results get the following:

```
  "interfaces": {
    "error": null,
    "severity": "ok",
    "warnings": null,
    "dismissed": false,
    "interfaces": [
      {
        "name": "lo0",
        "mtu": 16384,
        "addresses": [
          "127.0.0.1/8",
          "::1/128",
          "fe80::1/64"
        ]
      },
      {
        "name": "en8",
        "mtu": 1500,
        "addresses": [
          "192.168.50.217/24",
          "fe80::c13:1a92:3fa5:dd7e/64"
        ]
      }
    ]
  }
```

_Technically_ not back compatible if anyone is parsing `coder netcheck` output as JSON, since the original output is now under `"derp"` in the output.
This commit is contained in:
Spike Curtis
2024-06-13 10:19:36 +04:00
committed by GitHub
parent d0fc81a51c
commit fc09077b7b
7 changed files with 300 additions and 5 deletions
+11
View File
@@ -328,6 +328,17 @@ version of Coder.
> Note: This may be a transient issue if you are currently in the process of
> updating your deployment.
### EIF01
_Interface with Small MTU_
**Problem:** One or more local interfaces have MTU smaller than 1378, which is
the minimum MTU for Coder to establish direct connections without fragmentation.
**Solution:** Since IP fragmentation can be a source of performance problems, we
recommend you disable the interface when using Coder or
[disable direct connections](../../cli#--disable-direct-connections)
## EUNKNOWN
_Unknown Error_