SME Server on Scientific Linux
The SME Server distribution is based on CentOS. Since CentOS is a derivative of RHEL, it is possible to install the SME Server functionalities on top of other (virtually 100% binary compatible) RHEL derivatives, including CentOS itself.
This possibility may be interesting for organisations that have a software policy in place that prevents the deployment of a server OS not listed as an allowed OS within such a policy. Typically large enterprises, governmental and university related organisations have and enforce such a policy.
Scientific Linux has the following introduction:
SL is a Linux release put together by Fermilab, CERN, and various other labs and universities around the world. Its primary purpose is to reduce duplicated effort of the labs, and to have a common install base for the various experimenters. The base SL distribution is basically Enterprise Linux, recompiled from source. Our main goal for the base distribution is to have everything compatible with Enterprise, with only a few minor additions or changes. Examples of items that were added are Alpine, and OpenAFS. Our secondary goal is to allow easy customization for a site, without disturbing the Scientific Linux base. The various labs are able to add their own modifications to their own site areas. By the magic of scripts, and the anaconda installer, each site is to be able to create their own distributions with minimal effort. Or, if a user wishes, they can simply install the base SL release.
SME Server 9.0 on top of Scientific Linux
The installation instructions of SME Server functionality are based on minimal installation of Scientific Linux 6.3 64-bit and SME Server 9.0alpha1 repository. Please use a virtual environment to test your results. Virtual environments may include e.g. VirtualBox (free), VMWare, KVM or Xen.
Install SL minimal
SME Server functionality is only tested with a minimal install of Scientific Linux. To be able to install 'SL minimal' one must use the DVD install ISO. Other available downloads like the LiveCD etc. do not have the option to install 'SL minimal'.
You can download the SL DVD install CD from either here, here or here. Install SL minimal in your virtual environment which should have at least:
- 1Gb RAM memory
- 20Gb harddisk
- 1 Network interface bridged to your host network interface
- Internet access
When using the SL install DVD you have the option to select what to install. Please select 'minimal' and leave all other options as per their defaults.
Once the installation has finished, please reboot and continue with enabling networking and SSH.
Enable networking and SSH
Login as root with the password what was provided at installation time. To enable networking please issue:
ifup eth0
This will bring up eth0 based on your local available DHCP server. Please check you IP with 'ipconfig' and 'ip link show'. During the configuration of SME Server functionality, final and fixed IP addresses will be configured.
To enable SSH please issue:
service sshd start
SSH will now be enabled. Please log in remotely via SSH and further instructions are based on the fact that you are remotely logged. Specifically for Cut and Paste operations.
Disable SELinux
SELinux is enabled by default. We want to disable it for there are a few services (httpd) that get blocked by SELinux. To check this you can enter the command:
getenforce
and to disable SELinux enter the command:
setenforce 0
SELinux uses policies that conflict with some of the SME Server services ports like https. One can adjust the allowed ports, or remove the SELinux policies
yum remove selinux-policy-targeted
Merge repo's SME and SL
To be able to download the required packages we need to add the SME Server repo's. The auto-selected (closest) mirror may not be the fastest, and you may want to hash out the 'mirrorlist=' line entries and replace them with 'baseURL=' with a repo location of your choice. Please see this the download locations overview.
Yum install
yum install e-smith\* smeserver\* aspell aspell-en at audit-libs-python autoconf automake bc bind-libs bind-utils cronie cronie-anacron crontabs cyrus-sasl-md5 dhcp dosfstools ed eject elfutils elfutils-libs fetchmail ftp gettext glib gpm hesiod hmaccalc imake iptraf iptstate isdn4k-utils libXdmcp libgomp libselinux-python libsmbclient libsysfs libxml2-python lm_sensors lockdev lsof lvm2 m2crypto man mcstrans minicom mkbootdisk mlocate mod_ssl mtools mt-st mutt neon net-snmp net-snmp-utils openldap-servers patch pcmciautils postgresql-libs pyxf86config rpm-build rp-pppoe setserial strace sudo sysfsutils syslinux tcpdump telnet time tmpwatch traceroute unzip usbutils usermode vim-common vim-enhanced wget wodim xz zip zlib php-pear-Net-URL perl-Compress-Raw-Bzip2 perl-IO-Compress-Bzip2 rsync tnef freeradius-ldap --exclude=centos*,smeserver-release --nogpg
Install 497 Package(s) Upgrade 19 Package(s) Total download size: 226 M
Yum update
After the initial yum install we need to update to the latest versions available in the repositories.
yum update --nogpg
This will result in the below summary. The numbers may vary depending on the changes in the repositories.
Transaction Summary Install 1 Package(s) Upgrade 39 Package(s) Total download size: 70 M
Post-upgrade/reboot
The installation of SME Server functionality is finished. For the initial configuration the following commands are mandatory:
/sbin/e-smith/signal-event post-upgrade /sbin/e-smith/signal-event reboot
First use
Set root password
After the first boot, an new root (admin) password will be asked. This may be the same as you used for the initial installation of SL or you can set a new one. After setting the root password, SME Server will configure additional settings and automatically reboot
Reset MySQL root password
SME Server uses a secure random password for the MySQL root user. A new MySQL root password has to be generated to overwrite the SL root MySQL password. How to do this is explained here. As root issue the following commands:
cd /var/service/mysqld sv d . expand-template /root/.my.cnf expand-template /var/service/mysqld/set.password /usr/libexec/mysqld --bootstrap --user=mysql --skip-grant-tables < ./set.password sv u .
Adjust yum repositories
By default SME Server assumes it has CentOS as base linux system, In this case we use Scientific Linux, so we have to remove the CentOS specific repo's and add the SL repo's.
To remove the CentOS specific repo's issue the following commands as root:
db yum_repositories delete base db yum_repositories delete addons db yum_repositories delete centosplus db yum_repositories delete contrib db yum_repositories delete extras
and add SL repo's the 'SME Server way'
TBA
and update and activate the revised yum repo's configuration with the following command:
signal-event yum-modify
Configuration
When the system has rebooted, it is ready for configuration of network and services setting. To start this process, please login as root and type:
console
and select 'configure this server'. After configuration, the server will reboot itself, re-configure itself based on the user choices.
