How-to install LXC and OpenQuake LXC on RHEL/CentOS 6

As root user:

1) Add the EPEL repo to your RHEL/CentOS 6 server

$ rpm -ivh http://mirror.nl.leaseweb.net/epel/6/i386/epel-release-6-8.noarch.rpm

2) Install LXC 1.0.6 from epel and some other stuff needed

$ yum install lxc lxc-libs lxc-templates bridge-utils libcgroup

3) Enable the cgroups

$ service cgconfig start
$ service cgred start
$ chkconfig --level 345 cgconfig on
$ chkconfig --level 345 cgred on

4) Setup the network:

the easiest way is to create an internal network, so you do not need to expose the LXC to the bare-metal server network.

a) Create the bridge

$ brctl addbr lxcbr0

b) Make the bridge persistent on reboot

create /etc/sysconfig/network-scripts/ifcfg-lxcbr0 and add
DEVICE="lxcbr0"
TYPE="Bridge"
BOOTPROTO="static"
IPADDR="10.0.3.1"
NETMASK="255.255.255.0"

c) Start the bridge interface

$ ifup lxcbr0

5) Configure the firewall

to allow outgoing traffic from the container: edit /etc/sysconfig/iptables and

a) Comment or remove

-A FORWARD -j REJECT --reject-with icmp-host-prohibited

b) Add at the end of file

*nat
:PREROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -o eth0 -j MASQUERADE
COMMIT

c) Restart the firewall

$ service iptables restart

6) Enable IPv4 forwarding

edit /etc/sysctl.conf and change net.ipv4.ip_forward = 0 to net.ipv4.ip_forward = 1, then apply the new parameters with
$ sysctl –p

7) Download OpenQuake LXC

$ cd /tmp && wget http://ftp.openquake.org/oq-master/lxc/Ubuntu_lxc_12.04_64_oq_master_nightly-141020.tar.bz2

8) Extract the OpenQuake LXC

$ tar --numeric-owner -C /var/lib/lxc -xpsjf /tmp/Ubuntu_lxc_12.04_64_oq_master_nightly-141020.tar.bz2

9) Check if the LXC is installed and ready

with the command lxc-ls you should see
$ lxc-ls
openquake-nightly-141020

10) Setup the OpenQuake LXC ip address

open /var/lib/lxc/openquake/rootfs/etc/network/interfaces and change iface eth0 inet dhcp to
iface eth0 inet static
address 10.0.3.2
netmask 255.255.255.0
gateway 10.0.3.1
dns-nameservers 8.8.8.8

11) Start the OpenQuake LXC

$ lxc-start –d –n openquake

12) Login into the running OpenQuake LXC

$ lxc-console –n openquake
(to detach press ctrl-a + q)
You can also login using SSH from the host server:
$ ssh openquake@10.0.3.2
User: openquake
Password: openquake

Please note:

  • This how-to is intended for a fresh, standard installation of RHEL/CentOS 6 (and is tested on 6.4). It may need some adjustments for customized installations.
  • On 5. the firewall could be already customized by the sysadmin, please be careful when edit it. For more details please ask to your network and/or system administrator.
  • On 5. section b. -A POSTROUTING -o eth0 -j MASQUERADE "eth0" is the name of the host server main interface. It can differ in your configuration (see the used interface with ifconfig).
  • On 8. the --numeric-owner is mandatory.
  • On 10. the 8.8.8.8 DNS is the one provided by Google. It’s better to use your internal DNS, so change that IP address with the one associated to your DNS server. For more details please ask to your network and/or system administrator.
  • On certain installations the rsyslogd process inside the container can eat lots of CPU cycles. To fix it run, within the container, these commands (not required on containers prepared by us):
service rsyslog stop
sed -i -e 's/^\$ModLoad imklog/#\$ModLoad imklog/g' /etc/rsyslog.conf
service rsyslog start

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