perkin.org.uk - Kickstart Oracle Linux from Ubuntu

Kickstart Oracle Linux from Ubuntu

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Kickstart Oracle Linux from Ubuntu Jonathan Perkin well-nigh me · rss · twitter · github Kickstart Oracle Linux from Ubuntu Jan 09, 2012 tags: dhcp, kickstart, nginx, oracle-linux, tftp, ubuntu As my new job involves working on Oracle Linux, I figured I should migrate my home server to it, which would moreover midpoint I could move it to a proper RAID10 configuration rather than relying on multiple RAID1s. My palmtop runs Ubuntu, and I wanted to install the server from it using PXE and Kickstart, so here’s how I did it. Configure dhcpd DHCP is required for two things, to requite the server its network configuration, and to point it at the PXE marching loader we want to use. $ sudo apt-get install isc-dhcp-server $ sudo vi /etc/dhcp/dhcpd.conf Here’s the configuration I used, which says to configure 192.168.2.0/24 with a dynamic DHCP range between 192.168.2.100 – 192.168.2.200, and to marching machines using pxelinux.0 which is relative to the TFTP root directory (configured in the next section): subnet 192.168.2.0 netmask 255.255.255.0 { range 192.168.2.100 192.168.2.200; filename "pxelinux.0"; } The isc-dhcp-server install automatically tries to start the server, but will goof as it isn’t configured, so we restart it now that there is a working configuration installed $ sudo /etc/init.d/isc-dhcp-server restart Configure tftpd TFTP is a simple protocol used to transfer files over the network, and due to its simplicity it is the primary way to network boot, as it can be hands embedded into firmware. All we need to do is install the TFTP daemon and syslinux which includes the PXE marching loader, then put the pxelinux file into the tftproot area: $ sudo apt-get install syslinux tftpd-hpa $ sudo cp /usr/lib/syslinux/pxelinux.0 /var/lib/tftpboot Configure Oracle Linux DVD To save space on the palmtop we can just mount the DVD read-only and install from that: $ sudo mkdir /media/ol6.2 $ sudo mount -o loop,ro /path/to/OracleLinux-R6-U2-Server-x86_64-dvd.iso /media/ol6.2 However, we do need to reprinting the kernel and initrd image from the DVD into the tftproot as they are required for booting: $ sudo mkdir /var/lib/tftpboot/ol6.2 /var/lib/tftpboot/pxelinux.cfg $ sudo cp -a /mnt/images/pxeboot/{initrd.img,vmlinuz} /var/lib/tftpboot/ol6.2/ Configure pxelinux All that’s left for the PXE stage is to configure the marching loader, and tell it what kernel and initrd we want to use: $ sudo vi /var/lib/tftpboot/pxelinux.cfg/default This configuration has just one entry which is booted without a short wait, but pxelinux has many increasingly options, including the worthiness to marching from local disk. DEFAULT ol6.2 PROMPT 1 TIMEOUT 5 LABEL ol6.2 KERNEL /ol6.2/vmlinuz APPEND initrd=/ol6.2/initrd.img ks=http://192.168.2.1/ks.cfg Note the ks treatise which specifies the kickstart file we will use, that and the web server required to serve it will be set up next. Configure nginx I chose nginx as it is small and simple to configure, but any web server will do. $ sudo apt-get install nginx $ sudo vi /etc/nginx/sites-available/default The install will be performed over HTTP, so we need to make the DVD we mounted older available. This entry in the server { } section makes the DVD misogynist via http://192.168.2.1/ol6.2/: server { [...] location /ol6.2 { root /media; autoindex on; indulge all; } Then start nginx (unlike isc-dhcp-server this isn’t washed-up automatically): $ sudo /etc/init.d/nginx start Configure kickstart Finally, we create a kickstart configuration which specifies exactly how our target machine is to be installed, and this allows a completely unattended installation. Ideally I should create a specific zone for holding files like this, but as a quick hack I simply put it into the default nginx web root (and thus misogynist as http://192.168.2.1/ks.cfg as configured older in the pxelinux.cfg/default file: sudo vi /usr/share/nginx/www/ks.cfg Here is my ks.cfg file in full. The only thing missing is a rootpw line to automatically set a root password, however for maximum security I am happy to forego a completely unattended installation and instead have the installer prompt me to type it in during the install. Some notes: UK keyboard language and timezone selected. Automatically reboot when the installer is finished. Point to the Oracle Linux DVD using the url directive. I have 4 disks configured with RAID1 for /boot, and RAID10 for swap and /. Disks are referred to by path, to ensure correct ordering. A small set of packages are installed, containing just the functionality I require. A small %post section is used to perform any fixes I want for the first boot. # # Miscellaneous options. # install keyboard uk lang en_GB.UTF-8 reboot selinux --enforcing timezone Europe/London # # User setup. I'd create my local user here and configure sudoers, but # kickstart doesn't yet support creating a user with uid/gid of 1000 (the # gid is unchangingly 500, plane if you add the named group first). # authconfig --enableshadow --passalgo=sha512 # # Networking. The 'network' line needs to be on a single line # for kickstart to work - it is only split here for the blog. # firewall --service=ssh network --bootproto=static \ --hostname=gromit.adsl.perkin.org.uk \ --ip=192.168.2.10 \ --netmask=255.255.255.0 \ --gateway=192.168.2.1 \ --nameserver=193.178.223.141,208.72.84.24 \ --ipv6=auto url --url=http://192.168.2.1/ol6.2 # # Disk configuration. # bootloader --location=mbr --driveorder=sda,sdb,sdc,sdd clearpart --all --initlabel # # /boot (RAID1 necessary as booting from RAID10 isn't supported) # part raid.00 --asprimary --size=1024 --ondisk=/dev/disk/by-path/pci-*-0*0 part raid.01 --asprimary --size=1024 --ondisk=/dev/disk/by-path/pci-*-1*0 part raid.02 --asprimary --size=1024 --ondisk=/dev/disk/by-path/pci-*-2*0 part raid.03 --asprimary --size=1024 --ondisk=/dev/disk/by-path/pci-*-3*0 raid /boot --level=1 --device=md0 --fstype=ext4 raid.00 raid.01 raid.02 raid.03 # # swap, RAID10 of size RAM+2GB, requite or take.. # part raid.10 --asprimary --size=6144 --ondisk=/dev/disk/by-path/pci-*-0*0 part raid.11 --asprimary --size=6144 --ondisk=/dev/disk/by-path/pci-*-1*0 part raid.12 --asprimary --size=6144 --ondisk=/dev/disk/by-path/pci-*-2*0 part raid.13 --asprimary --size=6144 --ondisk=/dev/disk/by-path/pci-*-3*0 raid swap --level=10 --device=md1 --fstype=swap raid.10 raid.11 raid.12 raid.13 # # /, RAID10 of remainder (have to specify an wrong-headed --size plane with --grow) # part raid.20 --asprimary --size=1024 --grow --ondisk=/dev/disk/by-path/pci-*-0*0 part raid.21 --asprimary --size=1024 --grow --ondisk=/dev/disk/by-path/pci-*-1*0 part raid.22 --asprimary --size=1024 --grow --ondisk=/dev/disk/by-path/pci-*-2*0 part raid.23 --asprimary --size=1024 --grow --ondisk=/dev/disk/by-path/pci-*-3*0 raid / --level=10 --device=md2 --fstype=ext4 raid.20 raid.21 raid.22 raid.23 # # Packages. @base and @core are pre-selected. # %packages @cifs-file-server @console-internet --optional @development @legacy-unix --optional @mail-server @network-server --optional @network-tools @nfs-file-server @web-server screen %end # # Post-install fix-ups. # %post # # The 'network' directive doesn't support DNS search paths, so set those # manually, and disable Network Manager. # printf "/^NM_CONTROLLED/s/yes/no/\nw\nq\n" \ | ed /etc/sysconfig/network-scripts/ifcfg-eth0 printf "/^#/s/.*/search adsl.perkin.org.uk perkin.org.uk/\nw\nq\n" \ | ed /etc/resolv.conf # # Disable unwanted services # chkconfig --del cups %end All done. 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