Add --ipsec option to the installer

Signed-off-by: Christian Melgarejo Bresanovich <cmelgarejo.dev@gmail.com>

README.md

@@ -106,8 +106,9 @@ Other options for `install`:
 * `--merge` - Merge config into existing file instead of overwriting (e.g. to add config to the default kubectl config, use `--local-path ~/.kube/config --merge`).
 * `--context` - default is `default` - set the name of the kubeconfig context.
 * `--ssh-port` - default is `22`, but you can specify an alternative port i.e. `2222`
-* `--k3s-extra-args` - Optional extra arguments to pass to k3s installer, wrapped in quotes, i.e. `--k3s-extra-args '--no-deploy traefik'` or `--k3s-extra-args '--docker'`. For multiple args combine then within single quotes `--k3s-extra-args '--no-deploy traefik --docker'`.  
+* `--k3s-extra-args` - Optional extra arguments to pass to k3s installer, wrapped in quotes, i.e. `--k3s-extra-args '--no-deploy traefik'` or `--k3s-extra-args '--docker'`. For multiple args combine then within single quotes `--k3s-extra-args '--no-deploy traefik --docker'`.
 * `--k3s-version` - set the specific version of k3s, i.e. `v0.9.1`
+- `--ipsec` - Enforces the optional extra argument for k3s: `--flannel-backend` option: `ipsec`
 * See even more install options by running `k3sup install --help`.
 
 * Now try the access:

pkg/cmd/install.go

@@ -42,6 +42,7 @@ func MakeInstall() *cobra.Command {
 	command.Flags().String("local-path", "kubeconfig", "Local path to save the kubeconfig file")
 	command.Flags().String("context", "default", "Set the name of the kubeconfig context.")
 	command.Flags().String("k3s-extra-args", "", "Optional extra arguments to pass to k3s installer, wrapped in quotes (e.g. --k3s-extra-args '--no-deploy servicelb')")
+	command.Flags().Bool("ipsec", false, "Enforces and/or activates optional extra argument for k3s: flannel-backend option: ipsec")
 	command.Flags().Bool("merge", false, "Merge the config with existing kubeconfig if it already exists.\nProvide the --local-path flag with --merge if a kubeconfig already exists in some other directory")
 	command.Flags().String("k3s-version", config.K3sVersion, "Optional version to install, pinned at a default")
 
@@ -64,6 +65,7 @@ func MakeInstall() *cobra.Command {
 
 		k3sVersion, _ := command.Flags().GetString("k3s-version")
 		k3sExtraArgs, _ := command.Flags().GetString("k3s-extra-args")
+		flannelIPSec, _ := command.Flags().GetBool("ipsec")
 
 		local, _ := command.Flags().GetBool("local")
 
@@ -76,6 +78,10 @@ func MakeInstall() *cobra.Command {
 			clusterStr = "--cluster-init"
 		}
 
+		if flannelIPSec {
+			k3sExtraArgs += ` '--flannel-backend ipsec'`
+		}
+
 		installk3sExec := fmt.Sprintf("INSTALL_K3S_EXEC='server %s --tls-san %s %s'", clusterStr, ip, strings.TrimSpace(k3sExtraArgs))
 
 		installK3scommand := fmt.Sprintf("curl -sLS https://get.k3s.io | %s INSTALL_K3S_VERSION='%s' sh -\n", installk3sExec, k3sVersion)