Slacware CenOS based linux container

If you need to create a CentOS based linux container on your Slackware here you can find how i’ve made it.

Before you start

(re)compile your kernel including every config option needed to have lxc-checkconfig output “enable” in each line.
(re)compile your kernel to add support for “networking bridge”
update rpm package using the one found here
install yum package, you can find it here
make sure to have lxc package installed (it’s in the main Slackware repository)
make sure tu have installed bridge-utils package (it’s in the main Slackware repository)
make sure to have enough free disk space (my setup used at least 400MB)
add at the end of /etc/rc.d/rc.local the following lines
/usr/sbin/brctl addbr br0
/usr/sbin/brctl br0 10.0.0.1/24
/usr/sbin/iptables -t nat -A POSTROUTING -s 10.0.0.100 -o eth0 -j MASQUERADE
/sbin/sysctl net.ipv4.ip_forward=1

Create the Container

execute lxc-create –name Name –template=centos –dir=Path
Name is the name you want to give to your container
Path is the directory you want to use to store all the files
wait and give answers to questions
enter into Path
read from tmp_root_pass the password you will use to access, as root, the container shell
modify file config adding the following lines to the network section
lxc.network.type = veth
lxc.network.flags = up
lxc.network.link = br0
lxc.network.name = eth0
lxc.network.ipv4=10.0.0.100
lxc.network.ipv4.gateway=10.0.0.1
lxc.network.flags=up
lxc.network.mtu=1500

Base commands to manage containers

Final notes

this configuration allow you to access your CentOS container only from your Slackare host machine, if you need to access it from outside you have to change your bridge configuration
to see more commands you can use to manage containers open, as root, a shell, digit lxc and than press twice <tab>
using my guide your linux container will have 10.0.0.100 as ip address and your bridge will use 10.0.0.1

Slackware: CentOS linux container