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TUN-8914: Add a new configuration to locally override the max-active-flows

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## Summary

This commit introduces a new command line flag, `--max-active-flows`, which allows overriding the remote configuration for the maximum number of active flows.

The flag can be used with the `run` command, like `cloudflared tunnel --no-autoupdate run --token <TUNNEL_TOKEN> --max-active-flows 50000`, or set via an environment variable `TUNNEL_MAX_ACTIVE_FLOWS`.

Note that locally-set values always take precedence over remote settings, even if the tunnel is remotely managed.

Closes TUN-8914
This commit is contained in:
João "Pisco" Fernandes
2025-02-03 03:42:50 -08:00
parent 2feccd772c
commit b187879e69
5 changed files with 134 additions and 39 deletions
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3
cmd/cloudflared/tunnel/cmd.go
View File

@@ -126,7 +126,7 @@ var (
routeFailMsg = fmt.Sprintf("failed to provision routing, please create it manually via Cloudflare dashboard or UI; "+
"most likely you already have a conflicting record there. You can also rerun this command with --%s to overwrite "+
"any existing DNS records for this hostname.", overwriteDNSFlag)
errDeprecatedClassicTunnel = fmt.Errorf("Classic tunnels have been deprecated, please use Named Tunnels. (https://developers.cloudflare.com/cloudflare-one/connections/connect-apps/install-and-setup/tunnel-guide/)")
errDeprecatedClassicTunnel = errors.New("Classic tunnels have been deprecated, please use Named Tunnels. (https://developers.cloudflare.com/cloudflare-one/connections/connect-apps/install-and-setup/tunnel-guide/)")
// TODO: TUN-8756 the list below denotes the flags that do not possess any kind of sensitive information
// however this approach is not maintainble in the long-term.
nonSecretFlagsList = []string{
@@ -214,6 +214,7 @@ var (
"protocol",
"overwrite-dns",
"help",
"max-active-flows",
}
)

2
cmd/cloudflared/tunnel/configuration.go
View File

@@ -38,7 +38,7 @@ const (
var (
secretFlags = [2]*altsrc.StringFlag{credentialsContentsFlag, tunnelTokenFlag}
configFlags = []string{"autoupdate-freq", "no-autoupdate", "retries", "protocol", "loglevel", "transport-loglevel", "origincert", "metrics", "metrics-update-freq", "edge-ip-version", "edge-bind-address"}
configFlags = []string{"autoupdate-freq", "no-autoupdate", "retries", "protocol", "loglevel", "transport-loglevel", "origincert", "metrics", "metrics-update-freq", "edge-ip-version", "edge-bind-address", "max-active-flows"}
)
func logClientOptions(c *cli.Context, log *zerolog.Logger) {

6
cmd/cloudflared/tunnel/subcommands.go
View File

@@ -230,6 +230,11 @@ var (
Usage: "Network diagnostics won't be performed",
Value: false,
}
maxActiveFlowsFlag = &cli.Uint64Flag{
Name: "max-active-flows",
Usage: "Overrides the remote configuration for max active private network flows (TCP/UDP) that this cloudflared instance supports",
EnvVars: []string{"TUNNEL_MAX_ACTIVE_FLOWS"},
}
)
func buildCreateCommand() *cli.Command {
@@ -705,6 +710,7 @@ func buildRunCommand() *cli.Command {
tunnelTokenFlag,
icmpv4SrcFlag,
icmpv6SrcFlag,
maxActiveFlowsFlag,
}
flags = append(flags, configureProxyFlags(false)...)
return &cli.Command{