[Release-1.25] - Allow to pass additional parameters to tailscale up

[manuelbuil]

Backport fix for Allow to pass additional parameters to tailscale up

• Allow to pass additional parameters to tailscale up #8245

[ShylajaDevadiga]

Validated on release-1.25 branch using commit id 857e017

Environment Details

Infrastructure
Cloud EC2 instance

Node(s) CPU architecture, OS, and Version:
Ubuntu 22.04

Cluster Configuration:
Single node

Config.yaml:

cat /etc/rancher/k3s/config,yaml
debug: true
write-kubeconfig-mode: 644
token: secret
cluster-init: true
vpn-auth: "name=tailscale,joinKey=REDACTED,extraArgs=--accept-dns=false"
cluster-cidr: 10.50.0.0/16

Steps to validate

1. Install tailscale
2. Copy config.yaml
3. Install k3s

Validation Results:
From the logs we see the extraArg --accept-dns is set to false

$ k3s -v
k3s version v1.25.14+k3s-857e0175 (857e0175)
go version go1.20.8

$ ip a|grep tailscale
3: tailscale0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1280 qdisc fq_codel state UNKNOWN group default qlen 500
    inet <IP>/32 scope global tailscale0

$ journalctl |grep tailscale|grep accept-dns

Sep 29 22:41:23 ip-172-31-0-119 k3s[27617]: time="2023-09-29T22:41:23Z" level=debug msg="Flags passed to tailscale up: [up --authkey REDACTED --timeout=30s --reset --accept-dns=false]"

extraArg passed persisted across restart of the service

$ sudo systemctl restart k3s
Sep 29 22:41:23 ip-172-31-0-119 k3s[27617]: time="2023-09-29T22:41:23Z" level=debug msg="Flags passed to tailscale up: [up --authkey REDACTED --timeout=30s --reset --accept-dns=false]"
Sep 29 22:43:20 ip-172-31-0-119 k3s[30144]: time="2023-09-29T22:43:20Z" level=debug msg="Flags passed to tailscale up: [up --authkey REDACTED --timeout=30s --reset --accept-dns=false]"