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|
package lxc
import (
"github.com/dotcloud/docker/pkg/label"
"github.com/dotcloud/docker/runtime/execdriver"
"strings"
"text/template"
)
const LxcTemplate = `
{{if .Network.Interface}}
# network configuration
lxc.network.type = veth
lxc.network.link = {{.Network.Interface.Bridge}}
lxc.network.name = eth0
{{else}}
# network is disabled (-n=false)
lxc.network.type = empty
lxc.network.flags = up
{{end}}
lxc.network.mtu = {{.Network.Mtu}}
# root filesystem
{{$ROOTFS := .Rootfs}}
lxc.rootfs = {{$ROOTFS}}
# use a dedicated pts for the container (and limit the number of pseudo terminal
# available)
lxc.pts = 1024
# disable the main console
lxc.console = none
{{if .ProcessLabel}}
lxc.se_context = {{ .ProcessLabel}}
{{end}}
{{$MOUNTLABEL := .MountLabel}}
# no controlling tty at all
lxc.tty = 1
{{if .Privileged}}
lxc.cgroup.devices.allow = a
{{else}}
# no implicit access to devices
lxc.cgroup.devices.deny = a
# but allow mknod for any device
lxc.cgroup.devices.allow = c *:* m
lxc.cgroup.devices.allow = b *:* m
# /dev/null and zero
lxc.cgroup.devices.allow = c 1:3 rwm
lxc.cgroup.devices.allow = c 1:5 rwm
# consoles
lxc.cgroup.devices.allow = c 5:1 rwm
lxc.cgroup.devices.allow = c 5:0 rwm
lxc.cgroup.devices.allow = c 4:0 rwm
lxc.cgroup.devices.allow = c 4:1 rwm
# /dev/urandom,/dev/random
lxc.cgroup.devices.allow = c 1:9 rwm
lxc.cgroup.devices.allow = c 1:8 rwm
# /dev/pts/ - pts namespaces are "coming soon"
lxc.cgroup.devices.allow = c 136:* rwm
lxc.cgroup.devices.allow = c 5:2 rwm
# tuntap
lxc.cgroup.devices.allow = c 10:200 rwm
# fuse
#lxc.cgroup.devices.allow = c 10:229 rwm
# rtc
#lxc.cgroup.devices.allow = c 254:0 rwm
{{end}}
# standard mount point
# Use mnt.putold as per https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/986385
lxc.pivotdir = lxc_putold
# NOTICE: These mounts must be applied within the namespace
# WARNING: procfs is a known attack vector and should probably be disabled
# if your userspace allows it. eg. see http://blog.zx2c4.com/749
lxc.mount.entry = proc {{escapeFstabSpaces $ROOTFS}}/proc proc nosuid,nodev,noexec 0 0
# WARNING: sysfs is a known attack vector and should probably be disabled
# if your userspace allows it. eg. see http://bit.ly/T9CkqJ
lxc.mount.entry = sysfs {{escapeFstabSpaces $ROOTFS}}/sys sysfs nosuid,nodev,noexec 0 0
{{if .Tty}}
lxc.mount.entry = {{.Console}} {{escapeFstabSpaces $ROOTFS}}/dev/console none bind,rw 0 0
{{end}}
lxc.mount.entry = devpts {{escapeFstabSpaces $ROOTFS}}/dev/pts devpts {{formatMountLabel "newinstance,ptmxmode=0666,nosuid,noexec" $MOUNTLABEL}} 0 0
lxc.mount.entry = shm {{escapeFstabSpaces $ROOTFS}}/dev/shm tmpfs {{formatMountLabel "size=65536k,nosuid,nodev,noexec" $MOUNTLABEL}} 0 0
{{range $value := .Mounts}}
{{if $value.Writable}}
lxc.mount.entry = {{$value.Source}} {{escapeFstabSpaces $ROOTFS}}/{{escapeFstabSpaces $value.Destination}} none bind,rw 0 0
{{else}}
lxc.mount.entry = {{$value.Source}} {{escapeFstabSpaces $ROOTFS}}/{{escapeFstabSpaces $value.Destination}} none bind,ro 0 0
{{end}}
{{end}}
{{if .Privileged}}
{{if .AppArmor}}
lxc.aa_profile = unconfined
{{else}}
#lxc.aa_profile = unconfined
{{end}}
{{end}}
# limits
{{if .Resources}}
{{if .Resources.Memory}}
lxc.cgroup.memory.limit_in_bytes = {{.Resources.Memory}}
lxc.cgroup.memory.soft_limit_in_bytes = {{.Resources.Memory}}
{{with $memSwap := getMemorySwap .Resources}}
lxc.cgroup.memory.memsw.limit_in_bytes = {{$memSwap}}
{{end}}
{{end}}
{{if .Resources.CpuShares}}
lxc.cgroup.cpu.shares = {{.Resources.CpuShares}}
{{end}}
{{end}}
{{if .Config.lxc}}
{{range $value := .Config.lxc}}
lxc.{{$value}}
{{end}}
{{end}}
`
var LxcTemplateCompiled *template.Template
// Escape spaces in strings according to the fstab documentation, which is the
// format for "lxc.mount.entry" lines in lxc.conf. See also "man 5 fstab".
func escapeFstabSpaces(field string) string {
return strings.Replace(field, " ", "\\040", -1)
}
func getMemorySwap(v *execdriver.Resources) int64 {
// By default, MemorySwap is set to twice the size of RAM.
// If you want to omit MemorySwap, set it to `-1'.
if v.MemorySwap < 0 {
return 0
}
return v.Memory * 2
}
func getLabel(c map[string][]string, name string) string {
label := c["label"]
for _, l := range label {
parts := strings.SplitN(l, "=", 2)
if strings.TrimSpace(parts[0]) == name {
return strings.TrimSpace(parts[1])
}
}
return ""
}
func init() {
var err error
funcMap := template.FuncMap{
"getMemorySwap": getMemorySwap,
"escapeFstabSpaces": escapeFstabSpaces,
"formatMountLabel": label.FormatMountLabel,
}
LxcTemplateCompiled, err = template.New("lxc").Funcs(funcMap).Parse(LxcTemplate)
if err != nil {
panic(err)
}
}
|
