Add host.lima.internal to /etc/hosts

Signed-off-by: Jan Dubois <[email protected]>

Author: jandubois

docs/internal.md

@@ -107,3 +107,4 @@ The volume label is "cidata", as defined by [cloud-init NoCloud](https://cloudin
 - `LIMA_CIDATA_MOUNTS_%d_MOUNTPOINT`: the N-th mount point of Lima mounts (N=0, 1, ...)
 - `LIMA_CIDATA_CONTAINERD_USER`: set to "1" if rootless containerd to be set up
 - `LIMA_CIDATA_CONTAINERD_SYSTEM`: set to "1" if system-wide containerd to be set up
+- `LIMA_CIDATA_SLIRP_GATEWAY`: set to the IP address of the host on the SLIRP network. `192.168.5.2`.

docs/network.md

@@ -6,15 +6,15 @@ By default Lima only enables the user-mode networking aka "slirp".
 
 ### Guest IP (192.168.5.15)
 
-The guest IP address is typically set to 192.168.5.15.
+The guest IP address is set to `192.168.5.15`.
 
 This IP address is not accessible from the host by design.
 
-Use `vde_vmnet` to allow accessing the guest IP from the host and other guests.
+Use [vde_vmnet](https://github.com/lima-vm/vde_vmnet) to allow accessing the guest IP from the host and other guests.
 
 ### Host IP (192.168.5.2)
 
-The loopback addresses of the host is accessible from the guest as 192.168.5.2.
+The loopback addresses of the host is `192.168.5.2` and is accessible from the guest as `host.lima.internal`.
 
 ### DNS (192.168.5.3)
 

pkg/cidata/cidata.TEMPLATE.d/boot/03-etc-hosts.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+set -eux -o pipefail
+
+sed -i '/host.lima.internal/d' /etc/hosts
+echo -e "${LIMA_CIDATA_SLIRP_GATEWAY}\thost.lima.internal" >>/etc/hosts

pkg/cidata/cidata.TEMPLATE.d/lima.env

@@ -14,3 +14,4 @@ LIMA_CIDATA_CONTAINERD_SYSTEM=1
 {{- else}}
 LIMA_CIDATA_CONTAINERD_SYSTEM=
 {{- end}}
+LIMA_CIDATA_SLIRP_GATEWAY={{ .SlirpGateway }}

pkg/cidata/cidata.go

@@ -47,10 +47,11 @@ func GenerateISO9660(instDir, name string, y *limayaml.LimaYAML) error {
 		return err
 	}
 	args := TemplateArgs{
-		Name:       name,
-		User:       u.Username,
-		UID:        uid,
-		Containerd: Containerd{System: *y.Containerd.System, User: *y.Containerd.User},
+		Name:         name,
+		User:         u.Username,
+		UID:          uid,
+		Containerd:   Containerd{System: *y.Containerd.System, User: *y.Containerd.User},
+		SlirpGateway: qemuconst.SlirpGateway,
 	}
 
 	pubKeys, err := sshutil.DefaultPubKeys(*y.SSH.LoadDotSSHPubKeys)

pkg/cidata/template.go

@@ -28,13 +28,14 @@ type Network struct {
 	Name       string
 }
 type TemplateArgs struct {
-	Name       string // instance name
-	User       string // user name
-	UID        int
-	SSHPubKeys []string
-	Mounts     []string // abs path, accessible by the User
-	Containerd Containerd
-	Networks   []Network
+	Name         string // instance name
+	User         string // user name
+	UID          int
+	SSHPubKeys   []string
+	Mounts       []string // abs path, accessible by the User
+	Containerd   Containerd
+	Networks     []Network
+	SlirpGateway string
 }
 
 func ValidateTemplateArgs(args TemplateArgs) error {

pkg/qemu/qemu.go

@@ -12,6 +12,7 @@ import (
 	"github.com/AkihiroSuda/lima/pkg/downloader"
 	"github.com/AkihiroSuda/lima/pkg/iso9660util"
 	"github.com/AkihiroSuda/lima/pkg/limayaml"
+	"github.com/AkihiroSuda/lima/pkg/qemu/qemuconst"
 	"github.com/AkihiroSuda/lima/pkg/store/filenames"
 	"github.com/docker/go-units"
 	"github.com/mattn/go-shellwords"
@@ -193,8 +194,8 @@ func Cmdline(cfg Config) (string, []string, error) {
 	args = append(args, "-cdrom", filepath.Join(cfg.InstanceDir, filenames.CIDataISO))
 
 	// Network
-	// CIDR is intentionally hardcoded to 192.168.5.0/24, as each of QEMU has its own independent slirp network.
-	args = append(args, "-netdev", fmt.Sprintf("user,id=net0,net=192.168.5.0/24,hostfwd=tcp:127.0.0.1:%d-:22", y.SSH.LocalPort))
+	args = append(args, "-netdev", fmt.Sprintf("user,id=net0,net=%s,dhcpstart=%s,hostfwd=tcp:127.0.0.1:%d-:22",
+		qemuconst.SlirpNetwork, qemuconst.SlirpIPAddress, y.SSH.LocalPort))
 	args = append(args, "-device", "virtio-net-pci,netdev=net0,mac="+limayaml.MACAddress(cfg.InstanceDir))
 	for i, vde := range y.Network.VDE {
 		// VDE4 accepts VNL like vde:///var/run/vde.ctl as well as file path like /var/run/vde.ctl .

pkg/qemu/qemuconst/qemuconst.go

@@ -2,4 +2,8 @@ package qemuconst
 
 const (
 	SlirpNICName = "eth0"
+	// CIDR is intentionally hardcoded to 192.168.5.0/24, as each of QEMU has its own independent slirp network.
+	SlirpNetwork = "192.168.5.0/24"
+	SlirpGateway = "192.168.5.2"
+	SlirpIPAddress = "192.168.5.15"
 )