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cmd/tailscaled: add -state=mem: to support creation of an ephemeral node.

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RELNOTE=`tailscaled --state=mem:` registers as an ephemeral node and
does not store state to disk.

Signed-off-by: Maisem Ali <maisem@tailscale.com>
This commit is contained in:
Maisem Ali
2022-02-18 12:55:22 -08:00
committed by Maisem Ali
parent 823d970d60
commit f9a50779e2
12 changed files with 46 additions and 18 deletions
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14
cmd/tailscaled/tailscaled.go
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@@ -28,6 +28,7 @@ import (
"time"
"inet.af/netaddr"
"tailscale.com/control/controlclient"
"tailscale.com/envknob"
"tailscale.com/ipn"
"tailscale.com/ipn/ipnserver"
@@ -123,7 +124,7 @@ func main() {
flag.StringVar(&args.httpProxyAddr, "outbound-http-proxy-listen", "", `optional [ip]:port to run an outbound HTTP proxy (e.g. "localhost:8080")`)
flag.StringVar(&args.tunname, "tun", defaultTunName(), `tunnel interface name; use "userspace-networking" (beta) to not use TUN`)
flag.Var(flagtype.PortValue(&args.port, 0), "port", "UDP port to listen on for WireGuard and peer-to-peer traffic; 0 means automatically select")
flag.StringVar(&args.statepath, "state", paths.DefaultTailscaledStateFile(), "absolute path of state file; use 'kube:<secret-name>' to use Kubernetes secrets or 'arn:aws:ssm:...' to store in AWS SSM. If empty and --statedir is provided, the default is <statedir>/tailscaled.state")
flag.StringVar(&args.statepath, "state", paths.DefaultTailscaledStateFile(), "absolute path of state file; use 'kube:<secret-name>' to use Kubernetes secrets or 'arn:aws:ssm:...' to store in AWS SSM; use 'mem:' to not store state and register as an emphemeral node. If empty and --statedir is provided, the default is <statedir>/tailscaled.state")
flag.StringVar(&args.statedir, "statedir", "", "path to directory for storage of config state, TLS certs, temporary incoming Taildrop files, etc. If empty, it's derived from --state when possible.")
flag.StringVar(&args.socketpath, "socket", paths.DefaultTailscaledSocket(), "path of the service unix socket")
flag.StringVar(&args.birdSocketPath, "bird-socket", "", "path of the bird unix socket")
@@ -238,8 +239,19 @@ func ipnServerOpts() (o ipnserver.Options) {
o.VarRoot = dir
}
}
if strings.HasPrefix(statePathOrDefault(), "mem:") {
// Register as an ephemeral node.
o.LoginFlags = controlclient.LoginEphemeral
}
switch goos {
case "js":
// The js/wasm client has no state storage so for now
// treat all interactive logins as ephemeral.
// TODO(bradfitz): if we start using browser LocalStorage
// or something, then rethink this.
o.LoginFlags = controlclient.LoginEphemeral
fallthrough
default:
o.SurviveDisconnects = true
o.AutostartStateKey = ipn.GlobalDaemonStateKey