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CentOS Linux 7 Install
Installing LON-CAPA on a minimal CentOS Linux 7 System
This document guides you through the process of setting up a new LON-CAPA server running CentOS Linux 7 with a minimum of packages installed. The computer will be configured solely as a LON-CAPA server and will be expected to have no other services running. Your server is expected to have a reasonably fast connection to the internet.
More information is available at http://install.lon-capa.org/.
Before you begin
Installing Linux is getting easier and easier. You will be required to log in to the machine and execute some routine Unix commands. Familiarity with the Apache web server, mod_perl, perl, and MySQL are not required to install and run LON-CAPA.
The installation process takes the following steps:
CentOS 7 isos can be obtained from links included on the CentOS download page. Either download the Boot ISO or the CentOS 7 binary
You will need to know the following network settings for your installation. Note:You must have a static IP address to use LON-CAPA. DHCP is not supported.
Installing CentOS Linux is straightforward. Documentation is available from http://wiki.centos.org/ Most of the installation screens are self explanatory. There are a few steps that require comment and are dealt with below.
Finish installing your server, reboot it, and log in as root.
LON-CAPA uses the traditional iptables package instead of the recent Firewalld, included for the first time with CentOS 7. Accordingly, you should install iptables-services, disable firewalld, and enable iptables.
yum install iptables-services systemctl mask firewalld systemctl enable iptables systemctl enable ip6tables systemctl stop firewalld systemctl start iptables systemctl start ip6tables yum install wget rpm --import http://install.loncapa.org/versions/centos/RPM-GPG-KEY-loncapa wget http://install.loncapa.org/versions/centos/7/system-config-firewall-tui-1.2.29-10.el7.noarch.rpm yum localinstall system-config-firewall-tui-1.2.29-10.el7.noarch.rpm
The system-config-firewall-tui tool should be used to configure the Firewall.
Update your system to the latest versions of the system software using yum.
Reboot your system before continuing with the installation.
Retrieve the centos7_loncapa_yum file from the LON-CAPA install site:
Install the centos7_loncapa_yum.conf
mv /etc/yum.conf /etc/yum.conf.backup cp centos7_loncapa_yum.conf /etc/yum.conf yum update
The default CentOS 7 installation includes SELinux enabled. Until such time as an SELinux security policy has been created for LON-CAPA, SELinux should be disabled. Retrieve the loncapa_selinux_config file from the LON-CAPA install site:
Install the selinux config file
mv /etc/selinux/config /etc/selinux/config.backup mv loncapa_selinux_config /etc/selinux/config reboot
yum install LONCAPA-prerequisites
This may take some minutes due to LON-CAPA's large number of dependencies.
Retrieve and execute LON-CAPA setup program
Retrieve the LON-CAPA setup with the following command:
Extract the archive with the following command:
tar xf install.tar
This creates a directory named installation. Change to it and execute the setup script with the following commands:
cd installation ./install.pl
The script is used to prepare a Linux system to run LON-CAPA, and can also be used to check the configuration of a system on which LON-CAPA has already been installed. Typically, though, you will run this script only once, when you first install LON-CAPA.
The script will analyze your system to determine which actions are recommended. The script will then prompt you to choose the actions you would like taken. Once a choice has been entered for all nine possible actions, required changes will be made.
The possible actions are:
Determine LON-CAPA Settings
LON-CAPA requires a number of identifying parameters to be set in order for it to function at all. Below is a list with descriptions.
To configure and install LON-CAPA, execute the following commands:
cd /root/loncapa-X.Y.Z (X.Y.Z should correspond to a version number like '2.11.0') ./UPDATE
You will need to enter the LON-CAPA configuration information you determined in the previous section.
You will need at least one user at your site who has the role of 'domain coordinator'. This user creates accounts for other users and grants them additional privileges. The make_domain_coordinator.pl script invoked below requires that you enter the user's password. Feel free to use the "passwd username" command to change it later. Replace USERNAME and DOMAIN with an appropriate user name and your domain. If installing a library server and an access server on separate machines or VMs you need only run make_domain_coordinator.pl on the library server.
cd /root/loncapa-X.Y.Z/loncom/build perl make_domain_coordinator.pl USERNAME DOMAIN
The LON-CAPA network services take a moment to start. Most misconfigurations will be apparent at this step.
/etc/init.d/loncontrol start service httpd start
If you receive warnings about missing perl modules, when starting the httpd service please make sure you followed the instructions in Installing LON-CAPA Dependencies. If you still have errors, please contact the LON-CAPA Helpdesk -- helpdesk at loncapa.org
Point a web browser at your new machine and log in as the domain coordinator. Congratulations!
If things aren't working right
If you've followed the steps above and the server doesn't start or you think there's something wrong, please contact the LON-CAPA helpdesk. Installation/update support is available from: helpdesk at loncapa.org (replace " at " with @). If there were errors in installation of the dependency RPMs or errors during the automatic setup, please send us as much information as possible. If some part of this document is unclear please let us know.
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Supported by the National Science Foundation under NSF-ITR 0085921, NSF-CCLI-ASA 0243126, and NSF-CCLI 0717790. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. Initial funding for CAPA has been provided by the Alfred. P. Sloan Foundation and the Andrew W. Mellon Foundation.
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