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lxc_template.go
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lxc_template.go
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package docker
import (
"text/template"
)
const LxcTemplate = `
# hostname
{{if .Config.Hostname}}
lxc.utsname = {{.Config.Hostname}}
{{else}}
lxc.utsname = {{.Id}}
{{end}}
{{if .Config.NetworkDisabled}}
# network is disabled (-n=false)
lxc.network.type = empty
{{else}}
# network configuration
lxc.network.type = veth
lxc.network.flags = up
lxc.network.link = {{.NetworkSettings.Bridge}}
lxc.network.name = eth0
lxc.network.mtu = 1500
lxc.network.ipv4 = {{.NetworkSettings.IPAddress}}/{{.NetworkSettings.IPPrefixLen}}
{{end}}
# root filesystem
{{$ROOTFS := .RootfsPath}}
lxc.rootfs = {{$ROOTFS}}
{{if and .HostnamePath .HostsPath}}
# enable domain name support
lxc.mount.entry = {{.HostnamePath}} {{$ROOTFS}}/etc/hostname none bind,ro 0 0
lxc.mount.entry = {{.HostsPath}} {{$ROOTFS}}/etc/hosts none bind,ro 0 0
{{end}}
# 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
# no controlling tty at all
lxc.tty = 1
{{if (getHostConfig .).Privileged}}
lxc.cgroup.devices.allow = a
{{else}}
# no implicit access to devices
lxc.cgroup.devices.deny = a
# /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
# 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 {{$ROOTFS}}/proc proc nosuid,nodev,noexec 0 0
# WARNING: sysfs is a known attack vector and should probably be disabled
# if your userspace allows it. eg. see http://bit.ly/T9CkqJ
lxc.mount.entry = sysfs {{$ROOTFS}}/sys sysfs nosuid,nodev,noexec 0 0
lxc.mount.entry = devpts {{$ROOTFS}}/dev/pts devpts newinstance,ptmxmode=0666,nosuid,noexec 0 0
#lxc.mount.entry = varrun {{$ROOTFS}}/var/run tmpfs mode=755,size=4096k,nosuid,nodev,noexec 0 0
#lxc.mount.entry = varlock {{$ROOTFS}}/var/lock tmpfs size=1024k,nosuid,nodev,noexec 0 0
lxc.mount.entry = shm {{$ROOTFS}}/dev/shm tmpfs size=65536k,nosuid,nodev,noexec 0 0
# Inject dockerinit
lxc.mount.entry = {{.SysInitPath}} {{$ROOTFS}}/.dockerinit none bind,ro 0 0
# Inject env
lxc.mount.entry = {{.EnvConfigPath}} {{$ROOTFS}}/.dockerenv none bind,ro 0 0
# In order to get a working DNS environment, mount bind (ro) the host's /etc/resolv.conf into the container
lxc.mount.entry = {{.ResolvConfPath}} {{$ROOTFS}}/etc/resolv.conf none bind,ro 0 0
{{if .Volumes}}
{{ $rw := .VolumesRW }}
{{range $virtualPath, $realPath := .Volumes}}
lxc.mount.entry = {{$realPath}} {{$ROOTFS}}/{{$virtualPath}} none bind,{{ if index $rw $virtualPath }}rw{{else}}ro{{end}} 0 0
{{end}}
{{end}}
{{if (getHostConfig .).Privileged}}
# retain all capabilities; no lxc.cap.drop line
{{if (getCapabilities .).AppArmor}}
lxc.aa_profile = unconfined
{{else}}
#lxc.aa_profile = unconfined
{{end}}
{{else}}
# drop linux capabilities (apply mainly to the user root in the container)
# (Note: 'lxc.cap.keep' is coming soon and should replace this under the
# security principle 'deny all unless explicitly permitted', see
# http://sourceforge.net/mailarchive/message.php?msg_id=31054627 )
lxc.cap.drop = audit_control audit_write mac_admin mac_override mknod setpcap sys_admin sys_module sys_nice sys_pacct sys_rawio sys_resource sys_time sys_tty_config
{{end}}
# limits
{{if .Config.Memory}}
lxc.cgroup.memory.limit_in_bytes = {{.Config.Memory}}
lxc.cgroup.memory.soft_limit_in_bytes = {{.Config.Memory}}
{{with $memSwap := getMemorySwap .Config}}
lxc.cgroup.memory.memsw.limit_in_bytes = {{$memSwap}}
{{end}}
{{end}}
{{if .Config.CpuShares}}
lxc.cgroup.cpu.shares = {{.Config.CpuShares}}
{{end}}
{{if (getHostConfig .).LxcConf}}
{{range $pair := (getHostConfig .).LxcConf}}
{{$pair.Key}} = {{$pair.Value}}
{{end}}
{{end}}
`
var LxcTemplateCompiled *template.Template
func getMemorySwap(config *Config) int64 {
// By default, MemorySwap is set to twice the size of RAM.
// If you want to omit MemorySwap, set it to `-1'.
if config.MemorySwap < 0 {
return 0
}
return config.Memory * 2
}
func getHostConfig(container *Container) *HostConfig {
return container.hostConfig
}
func getCapabilities(container *Container) *Capabilities {
return container.runtime.capabilities
}
func init() {
var err error
funcMap := template.FuncMap{
"getMemorySwap": getMemorySwap,
"getHostConfig": getHostConfig,
"getCapabilities": getCapabilities,
}
LxcTemplateCompiled, err = template.New("lxc").Funcs(funcMap).Parse(LxcTemplate)
if err != nil {
panic(err)
}
}