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====== Technical Information: Slackware Topics ======

===== Zenteknix Standard Installation =====
  * Plan out host name and IP address, configure DHCP server if relevant
  * Install from DVD, choosing generic kernel (omitting "huge" kernel)
  * Create initrd, using command generated by:<code>chroot /mnt /usr/share/mkinitrd/mkinitrd_command_generator.sh</code> ... a fairly commonly-generated command: <code>chroot /mnt mkinitrd -c -k 3.10.17 -f ext4 -r /dev/sda1 -m usb-storage:ehci-hcd:ehci-pci:usbhid:hid_generic:uhci-hcd:mbcache:jbd2:ext4 -u -o /boot/initrd.gz</code>
  * Edit /mnt/etc/lilo.conf to add initrd line, with a KVM-based VM using virtio, add:<code>disk = /dev/vda
bios = 0x80
max-partitions = 7</code>
  * Install lilo:<code>chroot /mnt lilo</code>
  * Make sure there's an /sbin/initscript for new system:<code>cp /mnt/sbin/initscript.sample /mnt/sbin/initscript</code>
  * Populate a ulimit setting for file descriptors:<code>ulimit -Hn 32768</code>
  * Make sure there's a link in /etc:<code>ln -s /sbin/initscript /mnt/etc/initscript</code>

... at this point, system can be booted, or some pre-emptive changes can be made:
  * Add $HOME/bin to PATH in /etc/profile
  * Change root shell to ksh:  ''vi /mnt/etc/passwd''
  * Make sure the wheel group is set up for sudo access:  ''vi /mnt/etc/sudoers''

... Now, log in as root and:
  * Correct and populate /etc/hosts
  * Change root shell to ksh (if desired and not already done) with:  ''chsh -s /bin/ksh root''
  * Edit /etc/group to make sure user(s) are in groups as desired (especially the wheel group)
  * Add user(s)
  * Edit /etc/sudoers to make sure the wheel group is set up for access
  * Change PermitRootLogin to no in /etc/ssh/sshd_config, then restart sshd with ''/etc/rc.d/rc.sshd restart''
  * Populate the newterm script and accompanying symbolic links into /usr/local/bin
  * Remove undesired packages
    * ConsoleKit
  * Add routing (if applicable) to /etc/rc.d/rc.inet2 for other subnets:<code># Add routing for WAN network on physical host
route add -host 24.159.210.154 eth0
route add -net 24.159.210.152 netmask 255.255.255.248 gw 24.159.210.154 eth0
</code>
  * Configure NTP in /etc/ntp.conf and enable at startup with ''chmod 744 /etc/rc.d/rc.ntpd''
    * ''server <ntpserveripaddr> iburst''
    * ''restrict default ignore''
    * ''restrict <ntpserveripaddr> mask 255.255.255.255 nomodify notrap noquery''

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===== Zenteknix "FreeSlack Live" Modifications =====
After installing slackware, and sanitizing it to FreeSlack, these steps can be used to convert the installation to an operationally "live" variant, which minimizes changes to disk during routine operation.

==== Migrate the ''/var'' footprint to a "live"-capable arrangement ====
  * Create directory to house the memory-resident "live" portion of the ''/var'' footprint \\ ''mkdir /var/live''
  * Initialize the "live" area: \\ ''mount -t tmpfs tmpfs /var/live -o nodev,uid=0,gid=0,size=100m''
  * Migrate these ''/var'' subdirectories to under the live portion, one at a time, with: \\ ''cd /var ; mv subdirname live ; ln -s live/subdirname'' \\ Including: ''cache'', ''lib'', ''lock'', ''log'', ''run'', ''spool'', ''state'', ''tmp''
  * Initialize the storage "layers" from the current "live" footprint
    * The static layer:  ''rsync -ai /var/live /var/static''
    * The peristent layer:  ''rsync -ai /var/live/ /opt/sys/var''
  * Prune the respective storage layers to accommodate desired layering // (**Note:** see next section) //

==== Design and Prune the Storage Layers ====
  * The /usr/share/mime directory is re-built at every boot, so migrating that into the "live" footprint makes sense: \\ ''mkdir -p /var/static/usr /var/live/usr/share'' \\ ''chmod 755 /var/static/usr /var/live/usr /var/live/usr/share'' \\ ''cd /usr/share'' \\ ''mv mime /var/live/usr/share'' \\ ''ln -s /var/live/usr/share/mime'' \\ ''rsync -ai /var/live/usr/ /var/static/usr/''
  * The rationale behind the various things residing under the ''/var'' footprint can be a bit diverse, and there are some of these things that benefit from some persistence across a reboot.  To accommodate this (as well as minimize in-memory space occupied by the "live" footprint), one can migrate selected subdirectories from the directory tree under ''/var/live'', in a rather "surgical" fashion, to a location designated as the "persistent storage layer" (I chose ''/opt/sys/var''), and populate the ''/var/live'' tree with the symbolic links to the respective locations.  In doing this with a stock slackware installation, I start out with these links:<code>/var/live/log/setup               -> /opt/sys/var/log/setup
/var/live/log/scripts             -> /opt/sys/var/log/scripts
/var/live/log/removed_scripts     -> /opt/sys/var/log/removed_scripts
/var/live/log/removed_packages    -> /opt/sys/var/log/removed_packages
/var/live/log/packages            -> /opt/sys/var/log/packages
/var/live/lib/virtuoso            -> /opt/sys/var/lib/virtuoso
/var/live/lib/rpm                 -> /opt/sys/var/lib/rpm
/var/live/cache/ldconfig          -> /opt/sys/var/cache/ldconfig
/var/live/cache/fontconfig        -> /opt/sys/var/cache/fontconfig</code>
  * After migrating subdirectories and populating the respective links under ''/var/live'', synchronizing to ''/var/static'' should be performed.  This can either be done manually by repeating the process under ''/var/static'', or it can be scripted, or (if no other undesired changes have occurred under ''/var/live''): \\ ''rsync -ai /var/live/ /var/static/''

==== Adapt the startup scripts to engage the "live" footprint ====
  * Add to ''/etc/rc.d/rc.S'' before loading loop device kernel module:<code># Mount the live filesystem
if [ -d /var/live/log ]; then
	/sbin/mount -v -n -t tmpfs tmpfs /var/live -o nodev,uid=0,gid=0,size=100m
	/sbin/mount -v -n -t tmpfs tmpfs /tmp -o nodev,uid=0,gid=0,size=256m
fi</code>
  * Add to ''/etc/rc.d/rc.S'' before Configure ISA Plug-n-Play devices:<code># Add /var/live to /etc/mtab, and sync from static:
/sbin/mount -f tmpfs /tmp -t tmpfs
/sbin/mount -f tmpfs /var/live -t tmpfs
/usr/bin/rsync -ai /var/static/ /var/live/</code>

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// Links: [[:tech:linux:start|Linux Info]] ... [[:tech:start|Tech Info]] //
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