[lxc-users] red hat/centos guest support

[Tamas Papp]

On 06/12/2014 04:17 PM, Fajar A. Nugraha wrote:
> DIfferent distros have different needs. For example, an ubuntu 
> container works just fine running with restricted apparmor container 
> profile, while fedora (or any other distro which uses systemd) won't 
> work. 

I wa referring to the format of the config file.

For example
Ubuntu:

# Template used to create this container: 
/usr/share/lxc/templates/lxc-ubuntu
# Parameters passed to the template: -r precise
# For additional config options, please look at lxc.conf(5)

# Common configuration
lxc.include = /usr/share/lxc/config/ubuntu.common.conf

# Container specific configuration
lxc.rootfs = /tank/lxc/mine/rootfs
lxc.mount = /tank/lxc/mine/fstab
lxc.utsname = mine
lxc.arch = amd64

# Network configuration
lxc.network.type = veth
lxc.network.hwaddr = 00:16:3e:76:1f:5a
lxc.network.flags = up
lxc.network.link = br-eth0

lxc.start.auto = 1


Oracle:

# Template used to create this container: 
/usr/share/lxc/templates/lxc-oracle
# Parameters passed to the template:
lxc.network.type = veth
lxc.network.flags = up
lxc.network.link = br-eth0
lxc.rootfs = /tank/lxc/example-oracle/rootfs
# Container configuration for Oracle Linux 6.4
lxc.arch = x86_64
lxc.utsname = example-oracle
lxc.devttydir = lxc
lxc.tty = 4
lxc.pts = 1024
lxc.mount = /tank/lxc/example-oracle/fstab
lxc.hook.clone = /usr/share/lxc/hooks/clonehostname
# Uncomment these if you don't run anything that needs the capability, and
# would like the container to run with less privilege.
#
# Dropping sys_admin disables container root from doing a lot of things
# that could be bad like re-mounting lxc fstab entries rw for example,
# but also disables some useful things like being able to nfs mount, and
# things that are already namespaced with ns_capable() kernel checks, like
# hostname(1).
# lxc.cap.drop = sys_admin
# lxc.cap.drop = net_raw          # breaks dhcp/ping
# lxc.cap.drop = setgid           # breaks login (initgroups/setgroups)
# lxc.cap.drop = dac_read_search  # breaks login (pam unix_chkpwd)
# lxc.cap.drop = setuid           # breaks sshd,nfs statd
# lxc.cap.drop = audit_control    # breaks sshd (set_loginuid failed)
# lxc.cap.drop = audit_write
#
lxc.cap.drop = mac_admin mac_override setfcap setpcap
lxc.cap.drop = sys_module sys_nice sys_pacct
lxc.cap.drop = sys_rawio sys_time
lxc.cap.drop = sys_resource

# Networking
lxc.network.name = eth0
lxc.network.mtu = 1500
lxc.network.hwaddr = fe:5f:22:6a:23:f5
# Control Group devices: all denied except those whitelisted
lxc.cgroup.devices.deny = a
lxc.cgroup.devices.allow = c 1:3 rwm    # /dev/null
lxc.cgroup.devices.allow = c 1:5 rwm    # /dev/zero
lxc.cgroup.devices.allow = c 1:7 rwm    # /dev/full
lxc.cgroup.devices.allow = c 5:0 rwm    # /dev/tty
lxc.cgroup.devices.allow = c 1:8 rwm    # /dev/random
lxc.cgroup.devices.allow = c 1:9 rwm    # /dev/urandom
lxc.cgroup.devices.allow = c 136:* rwm    # /dev/tty[1-4] ptys and lxc 
console
lxc.cgroup.devices.allow = c 5:2 rwm    # /dev/ptmx pty master



I see no reason, why there is difference, how they look.
It could matter, when a human tries to parse it.

>> Also oracle, redhat, sl and centos templates should be very-very similar to
>> each other.
> ... and there's the fact that different people contribute/maintain
> them, and it would take additional efforts (probably a big one) to
> "merge" them to the same template while verifying that it still works.

However, that's correct, if that happened, they could be maintained more 
easily together(*). Eg. if there is a change, all template script could 
be updated at the same time.
For example RH7 is out, soon there will be OL7 and the others.

tamas

ps.: (*) IMO:)