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migrating from openrc to systemd

# remove blocking package, systemd provides the functionality.
emerge -C sys-fs/udev openrc netifrc virtual/service-manager sysvinit
# comment out service manager and openrc from your @system set, defined in /usr/portage/profiles/base/packages 

# add systemd to use flags
emerge -av systemd
emerge -av virtual/udev virtual/libudev

# set kernel options& recompile
Gentoo Linux --->
  Support for init systems, system and service managers --->
    [*] systemd


# to kernel command line:
init=/usr/lib/systemd/systemd

hostnamectl set-hostname 
cat /etc/locale.conf
# LANG="en_US"
localectl set-locale LANG=en_US
localectl set-keymap us

http://wiki.gentoo.org/wiki/Systemd

http://forums.gentoo.org/viewtopic-p-7656898.html

install gentoo from liveCD

suppose we booted up for a liveCD/USB

#mount the destination device, DEV
mount DEV /mnt/gentoo
cd /mnt/gentoo
wget http://mirror.mdfnet.se/gentoo/releases/amd64/autobuilds/current-stage3-amd64-nomultilib/stage3-amd64-20150226.tar.bz2
tar xjpf stage3*

cd /
mkdir -p /mnt/{dev,proc,sys}
mount -t proc proc /mnt/gentoo/proc
mount --rbind /dev /mnt/gentoo/dev
mount --rbind /sys /mnt/gentoo/sys
cp -L /etc/resolv.conf /mnt/gentoo/etc/ 
chroot /mnt/gentoo /bin/bash
source /etc/profile
emerge-webrsync

eselect profile list
passwd

#timezone
cp /usr/share/zoneinfo/Europe/Oslo /etc/localtime
echo "Europe/Oslo" > /etc/timezone
emerge --config timezone-data

# glibc will generate lang files according to:
nano locale.gen
locale-gen
eselect locale list

# check /etc/fstab

gentoo gcc optimalization – make.conf

edit you /etc/portage/make.conf

# chost [4] 
# 64bit intel processors are AMD64 or x86_64, IA64 is for ithanium
CHOST="x86_64-gentoo-linux-gnu"

# CPU arch
# use gcc to detech your arch: gcc -c -Q -march=native --help=target | grep march
CFLAGS="-march=broadwell -O2 -pipe -fomit-frame-pointer"
CXXFLAGS="${CFLAGS}"

# emerge -1v app-portage/cpuinfo2cpuflags
# cpuinfo2cpuflags
CPU_FLAGS_X86="mmx mmxext sse sse2 sse3"
USE="${CPU_FLAGS_X86} ..."

# N = #CPUs + 1 or just #CPUs, see link[3]
# interl 5y10 has 2 cores (x2 hyper threading):
MAKEOPTS="-j4"
ABI_X86="64"

# debug symbols stripped
FEATURES="splitdebug"

#misc:

# accept all unstable packages too
ACCEPT_KEYWORDS="~amd64"
# accept all licenses
ACCEPT_LICENSE="*"
# x11-base/xorg-drivers
VIDEO_CARDS="intel i965"
INPUT_DEVICES="evdev keyboard mouse mutouch virtualbox synaptics"
# pick the highest if possible
PYTHON_TARGETS="pypy python3_4"
RUBY_TARGETS="ruby22"

[1] Gentoo wiki: http://wiki.gentoo.org/wiki/GCC_optimization
[2] Look up your CPU architecture https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/i386-and-x86-64-Options.html#i386-and-x86-64-Options
[3]https://blogs.gentoo.org/ago/2013/01/14/makeopts-jcore-1-is-not-the-best-optimization
[4]http://wiki.gentoo.org/wiki/CHOST