OSCAR: quick_start_guide_for

OSCAR_unstable Quick Start Guide for CentOS-7, AlmaLinux-8, openSUSE-15.3

Notes:
- CentOS-6 is not supported anymore due to EOL of product. Though, packages are still availlable in case they are still needed. Installation process is similar to CentOS-7 except that you need to use CentOS vault repositories: curl https://www.getpagespeed.com/files/centos6-eol.repo --output /etc/yum.repos.d/CentOS-Base.repo yum -y install epel-release-6-8.noarch curl https://www.getpagespeed.com/files/centos6-epel-eol.repo --output /etc/yum.repos.d/epel.repo
- This Guide can also be used for a RHEL 7 or 8 install, but it is not tested.
- OpenSUSE-15 is newly supported and still incomplete.
Install AlmaLinux-8.x or CentOS-7.x or openSUSE-15.3 or Debian-10 or Debian-11 (or their Ubuntu equivalent) base server (+ X11 if you are working localy)
Setup hostname, and network.
Configure and enable the required repositories:
- CentOS-7:
  - yum -y install http://fr2.rpmfind.net/linux/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
  - yum -y install http://svn.oscar.openclustergroup.org/repos/unstable/rhel-7-x86_64/oscar-release-6.1.3-0.20210426.el8.noarch.rpm
- AlmaLinux-8:
  - dnf -y install dnf-plugins-core
  - dnf config-manager --set-enabled PowerTools
  - dnf -y install epel-release
  - dnf -y install http://svn.oscar.openclustergroup.org/repos/unstable/rhel-7-x86_64/oscar-release-6.1.3-0.20210426.el8.noarch.rpm
- openSUSE-15.3:
  - zypper install http://www.usablesecurity.net/OSCAR/repos/unstable/suse-15-x86_64/oscar-release-6.1.3-0.20210402.noarch.rpm
- Debian-10:
  - cat » /etc/apt/sources.list.d/oscar.list «EOF deb [trusted=yes] http://www.usablesecurity.net/OSCAR/repos/unstable/debian-10-x86_64 dists/buster/binary-amd64/ EOF
- Debian-11:
  - cat » /etc/apt/sources.list.d/oscar.list «EOF deb [trusted=yes] http://www.usablesecurity.net/OSCAR/repos/unstable/debian-11-x86_64 dists/bullseye/binary-amd64/ EOF
make sure that your mta (mail transfert agent) is postfix if you want mtaconfig to be of any use. if postfix is not your default mta, then do a:
- AlmaLinux-8:
  - dnf -y install postfix; yum remove sendmail exim
- CentOS-7:
  - yum -y install postfix; yum remove sendmail exim
- OpenSUSE-15:
  - zypper --non-interactive install --no-recommends --download-in-advance postfix; zypper --non-interactive remove sendmail exim
- Debian-10, Debian-11:
  - apt-get install postfix
Update SELinux config (/etc/selinux/config)

SELINUX=disabled
disable ipv6 in /etc/sysctl.conf (and reboot)

net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1
Install main oscar package:
- AlmaLinux-8:
  - dnf -y install oscar
- CentOS-7:
  - yum -y install oscar
- OpenSUSE-15:
  - zypper --non-interactive install --no-recommends --download-in-advance -f oscar
check /etc/oscar/oscar.conf
check /etc/oscar/supported_distros.txt
Configure oscar for your distro:

CentOS-7: oscar-config --setup-distro centos-7-x86_64

RHEL-7: oscar-config --setup-distro rhel-7-x86_64

AlmaLinux-8: oscar-config --setup-distro almalinux-8-x86_64

RHEL-8: oscar-config --setup-distro rhel-8-x86_64

OpenSUSE-15: oscar-config --setup-distro opensuse-15-x86_64
Bootstrapp oscar (install packages needed for your distro and do some basic configuration)

oscar-config --bootstrap
Start the OSCAR installer wizard;

oscar_wizard -d install
Wizard STEP1: Select experimental, then select: (bold means mandatory)
- apitest
- base
- blcr
- c3
- disable-services
- ganglia
- jobmonarch
- maui
- mtaconfig
- munge
- naemon
- netbootmgr
- nfs
- ntpconfig
- oda
- openmpi
- opium
- pvm
- sc3
- seliun
- sis
- switcher
- sync-files
- torque
- yume
Wizard STEP2: Configure selected oscar packages
Wizard STEP3: Install Oscar server packages
- Fix TFTP_DIR in /etc/systemimager/systemimager.conf
- Fix server_args in /etc/xinetd.d/tftp (tftpboot dir)
- restart si_netbootmond
- service systemimager-server-netbootmond restart
Wizard STEP4: Build Client image
Wizard STEP5: Define oscar clients
Wizard STEP6: Setup Networking
- Assign macs to nodes (if used start collecting MACS, then stop it before going further)
- Enable Install mode
- Configure DHCP server
- Setup Network Boot
edit /etc/dhcp/dhcpd.conf
- correct the gateway (option routers), then restart dhcpd (BUG)
- optionally add dns infos (those entries are ommited if you’re using non routable IPs) option domain-name “domain.company.com”; option domain-name-servers #.#.#.#, #.#.#.#;
Add postinstall scripts to configure bootloader and network (feature broken in system-configurator).

cd /var/lib/systemimager/scripts/post-install/
sudo wget http://svn.oscar.openclustergroup.org/pkgs/downloads/sis_postinstall/13all.keyboard_fr # (Optional: will set node console keyboard to fr_FR)
sudo wget http://svn.oscar.openclustergroup.org/pkgs/downloads/sis_postinstall/16all.network_config # Edit this to update DNS config
Monitor cluster deployment
PXE boot all nodes
Wizard STEP7: Complete cluster setup
Wizard STEP8: Test cluster setup

OSCAR_unstable Quick Remove script for CentOS/RHEL/Fedora

This script is useful to restart from scratch an OSCAR Install. It’s not perfect. All files modified (with a .oscarback backup) are not restored for instance.

#!/bin/bash
sudo oscar-config -t
sudo yum -y remove oscar drmaa-python ganglia* jobmonarch* "ganglia*" \ 
                   "jobmonarch*" "*torque*" "*openmpi*" "*systemimager*" \ 
                   netbootmgr opkgc perl-Qt atftp-server dhcp \
                   modules-default-manpath-oscar modules-oscar perl-OSCAR \
                   "naemon*" "nagios*" nrpe "postgresql" "rrdtool*" "httpd*" \
                   "slurm*" oscar-installer openmpi-switcher-modulefile
sudo rm -rf /etc/oscar \
            /etc/ganglia \
            /etc/naemon \
            /etc/systemimager \
            /etc/systeminstaller \
            /var/log/oscar \
            /var/lib/oscar \
            /var/lib/oscar-packager