May 2016 – Petr Bena's Bl0g

Gentoo quick setup (for advanced gentoo users)

May 8, 2016

This is an excerpt from gentoo handbook containing only the stuff that really matters, with no extra stuff:

Prepare your disks

Do I need to explain how? 🙂 if yes, this is not for you

Mount them

mkdir /mnt/gentoo
mount root /mnt/gentoo
mount boot /mnt/gentoo/boot

Prepare stage3

cd /mnt/gentoo
lynx http://distfiles.gentoo.org/releases/amd64/autobuilds/current-install-amd64-minimal/
tar xvjpf stage3-*.tar.bz2 --xattrs

Chroot

mirrorselect -i -o >> /mnt/gentoo/etc/portage/make.conf
mkdir /mnt/gentoo/etc/portage/repos.conf
cp /mnt/gentoo/usr/share/portage/config/repos.conf /mnt/gentoo/etc/portage/repos.conf/gentoo.conf
cp -L /etc/resolv.conf /mnt/gentoo/etc/
mount -t proc proc /mnt/gentoo/proc
mount --rbind /sys /mnt/gentoo/sys
mount --make-rslave /mnt/gentoo/sys
mount --rbind /dev /mnt/gentoo/dev
mount --make-rslave /mnt/gentoo/dev
chroot /mnt/gentoo /bin/bash
emerge-webrsync
emerge --sync

Emerge setup

eselect profile list
eselect profile set XXX
emerge --ask --update --deep --newuse @world
echo "Europe/Prague" > /etc/timezone
emerge --config sys-libs/timezone-data
emerge vim
vi /etc/locale.gen
locale-gen
eselect locale list
eselect locale set 5

Kernel

emerge sys-kernel/gentoo-sources sys-apps/pciutils 
cd /usr/src/linux 
# Build as you like
emerge sys-kernel/linux-firmware

Initramfs

Pick one

# Genkernel
emerge sys-kernel/genkernel
genkernel --install initramfs

# Dracut
emerge dracut
cd /boot
dracut

Filesystems

Just edit /etc/fstab

/dev/sda2   /boot        ext2    defaults,noatime     0 2
/dev/sda3   none         swap    sw                   0 0
/dev/sda4   /            ext4    noatime              0 1

Networking

emerge net-misc/dhcpcd ntpd net-misc/netifrc

cd /etc/init.d
ln -s net.lo net.eth0
rc-update add net.eth0 default

Grub

emerge --ask sys-boot/grub:2
grub2-install /dev/sda
grub2-mkconfig -o /boot/grub/grub.cfg

systemd cheat sheet

Services overview and unit files

# Show running units
systemctl

# Show status of OS
systemctl status

# List all units
systemctl list-units

# Display failed units:
systemctl --failed

The available unit files can be seen in /usr/lib/systemd/system/ and /etc/systemd/system/

Start / stop

systemctl start unit
# samples
systemctl start apache2.service

# stop
systemctl stop apache2.service

# restart
systemctl restart unit

# reload
systemctl reload unit

# Check whether a unit is already enabled or not:
systemctl is-enabled unit

# Show the status of a unit, including whether it is running or not:
systemctl status unit

Checking status

By default it should be possible to view the output of every unit using journal – journalctl

# Display logs of unit
journalctl -u unit

Enable / disable service

# Enable a unit to be started on bootup:
systemctl enable unit

# Disable a unit to not start during bootup:
systemctl disable unit

# Mask a unit to make it impossible to start it:
systemctl mask unit

# Unmask a unit:
systemctl unmask unit

Power management

# Reboot
systemctl reboot

# Shut down and power-off the system:
systemctl poweroff

# Suspend the system:
systemctl suspend

# Put the system into hibernation:
systemctl hibernate

# Put the system into hybrid-sleep state (or suspend-to-both):
systemctl hybrid-sleep

Modifying system

/usr/lib/systemd/system/: units provided by installed packages
/etc/systemd/system/: units installed by the system administrator

When you modify the unit file, you always need to run:

systemctl daemon-reload

See https://wiki.archlinux.org/index.php/systemd for more information

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