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Installing Arch Linux 2021-02-12T00:00:00

This note includes all commands I typed when I set up Arch Linux on my new bare metal server.

Why I choose Arch Linux

  • Simple as it should be
  • Outstanding community efforts to maintaining package registry
  • Well organized wiki resources

Useful links

Provisioning

wipe whole disk

wipefs -a /dev/sda

create partition

parted

select /dev/sda
mktable gpt
mkpart EFI fat32 0 512MB # EFI
mkpart Arch ext4 512MB 100% # Arch
set 1 esp on # flag part1 as ESP
quit

install file-system

mkfs.vfat -F 32 /dev/sda1 # EFI
mkfs.ext4 /dev/sda2 # Arch

mount disk

mkdir -p /mnt/boot
mount /dev/sda2 /mnt
mount /dev/sda1 /mnt/boot

install base & Linux kernel

reflector -f 10 --latest 30 --protocol https --sort rate --save /etc/pacman.d/mirrorlist # optimize mirror list

pacstrap /mnt base linux linux-firmware vim man-db man-pages git informant
# base-devel need to be included as well?
genfstab -U /mnt >> /mnt/etc/fstab
arch-chroot /mnt

pacman -Syu # upgrade
pacman -Qe # list explicitly installed pkgs
pacman -Rs # remove pkg and its deps
pacman -Qtd # list orphans

bootloader

pacman -S \
  grub \
  efibootmgr \
  amd-ucode # AMD microcode
grub-install --target=x86_64-efi --efi-directory=/boot --bootloader-id=GRUB
grub-mkconfig -o /boot/grub/grub.cfg

NTP

sed -i -e 's/#NTP=/NTP=0.arch.pool.ntp.org 1.arch.pool.ntp.org 2.arch.pool.ntp.org 3.arch.pool.ntp.org/' -e 's/#Fall/Fall/' /etc/systemd/timesyncd.conf
systemctl enable --now systemd-timesyncd

locale

ln -sf /usr/share/zoneinfo/Asia/Tokyo /etc/localtime
hwclock --systohc
vim /etc/locale.gen & locale-gen
echo "LANG=en_US.UTF-8" > /etc/locale.conf

network

hostnamectl set-hostname polka
hostnamectl set-chassis server

127.0.0.1 localhost
::1       localhost
127.0.0.1 polka

See https://systemd.network/systemd.network.html.

[Match]
Name=enp5s0

[Network]
#DHCP=yes
Address=10.0.1.2/24
Gateway=10.0.1.1
DNS=10.0.1.100   # self-hosted DNS resolver
DNS=1.1.1.1      # Cloudflare for the fallback DNS server
MACVLAN=dns-shim # to handle local dns lookup to 10.0.1.100 which is managed by Docker macvlan driver

# to handle local dns lookup to 10.0.1.100
[NetDev]
Name=dns-shim
Kind=macvlan

[MACVLAN]
Mode=bridge

# to handle local dns lookup to 10.0.1.100
[Match]
Name=dns-shim

[Network]
IPForward=yes

[Address]
Address=10.0.1.103/32
Scope=link

[Route]
Destination=10.0.1.100/30

ip equivalent to the above settings:

ip link add dns-shim link enp5s0 type macvlan mode bridge # add macvlan shim
ip a add 10.0.1.103/32 dev dns-shim # assign host ip to shim defined in docker-compose.yml
ip link set dns-shim up # enable interface
ip route add 10.0.1.100/30 dev dns-shim # route macvlan subnet to shim interface

systemctl enable --now systemd-networkd
networkctl status

# for self-hosted dns resolver
sed -r -i -e 's/#?DNSStubListener=yes/DNSStubListener=no/g' -e 's/#DNS=/DNS=10.0.1.100/g' /etc/systemd/resolved.conf
ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf

systemctl enable --now systemd-resolved
resolvectl status
resolvectl query ddg.gg
drill @10.0.1.100 ddg.gg

# FIXME
pacman -S wpa_supplicant
vim /etc/wpa_supplicant/wpa_supplicant.conf
# ctrl_interface=/run/wpa_supplicant
# update_config=1
wpa_supplicant -B -i wlp8s0 -c /etc/wpa_supplicant/wpa_supplicant.conf
wpa_cli # default control socket -> /var/run/wpa_supplicant
modinfo iwlwifi

If networkctl keep showing enp5s0 as degraded, then run ip addr add 10.0.1.2/24 dev enp5s0 to manually assign static IP address for the workaround.

firewall

pacman -S firewalld
# TODO

See also Introduction to Netfilter – To Linux and beyond !

shell

pacman -S zsh
chsh -s /bin/zsh

user

passwd # change root passwd

useradd -m -s /bin/zsh uetchy # add local user
passwd uetchy # change local user password

userdbctl # verify users

pacman -S sudo
echo "%sudo ALL=(ALL) NOPASSWD:/usr/bin/pacman" > /etc/sudoers.d/pacman # allow pacman without password
usermod -aG sudo uetchy # add local user to sudo group

ssh

pacman -S openssh
vim /etc/ssh/sshd_config
systemctl enable --now sshd

on the host machine:

ssh-copy-id uetchy@10.0.1.2

AUR

git clone https://aur.archlinux.org/yay.git
cd yay
makepkg -si

finalize

exit # leave chroot
umount -R /mnt
reboot

Additional setup

GPGPU

pacman -S nvidia
cat /var/lib/modprobe.d/nvidia.conf # ensure having 'blacklist nouveau'

yay -S cuda-10.2 cudnn7-cuda10.2 # match the version number

nvidia-smi # test runtime

docker

https://docs.nvidia.com/datacenter/cloud-native/container-toolkit/arch-overview.html

pacman -S docker docker-compose
yay -S nvidia-container-runtime

{
  "log-driver": "journald",
  "log-opts": {
    "tag": "{{.ImageName}}/{{.Name}}/{{.ID}}"
  },
  "exec-opts": ["native.cgroupdriver=systemd"], // for kubernetes
  "runtimes": {
    // for docker-compose
    "nvidia": {
      "path": "/usr/bin/nvidia-container-runtime",
      "runtimeArgs": []
    }
  }
}

systemctl enable --now docker

groupadd docker
usermod -aG docker user

docker run --rm -it --gpus all nvidia/cuda:10.2-cudnn7-runtime

Telegraf

yay -S telegraf
vim /etc/telegraf/telegraf.conf

Cmnd_Alias FAIL2BAN = /usr/bin/fail2ban-client status, /usr/bin/fail2ban-client status *
telegraf  ALL=(root) NOEXEC: NOPASSWD: FAIL2BAN
Defaults!FAIL2BAN !logfile, !syslog, !pam_session

fail2ban

pacman -S fail2ban
systemctl enable --now fail2ban

[DEFAULT]
bantime = 60m
ignoreip = 127.0.0.1/8 10.0.1.0/24

[sshd]
enabled = true
port = 22,10122

[mailu]
enabled = true
backend = systemd
journalmatch = CONTAINER_NAME=mailu_front_1
port = smtp,submission
chain = DOCKER-USER
filter = mailu
findtime = 600
maxretry = 1
bantime = 1d

[INCLUDES]
before = common.conf

[Definition]
failregex = ^%(__prefix_line)s\d+\/\d+\/\d+ \d+:\d+:\d+ \[info\] \d+#\d+: \*\d+ client login failed: "Authentication credentials invalid" while in http auth state, client: <HOST>, server: \S+, login: "<F-USER>\S+</F-USER>"$
ignoreregex =

fail2ban-client reload
fail2ban-client status mailu

sendmail

yay -S sendmail

cfddns

Dynamic DNS for Cloudflare.

yay -S cfddns

token: <token>

uechi.io
datastore.uechi.io

systemctl enable --now cfddns

smart

pacman -S smartmontools
systemctl enable --now smartd

smartctl -t short /dev/sdc
smartctl -l selftest /dev/sdc

backup

[Unit]
Description=Borg Daily Backup Service

[Service]
Type=simple
Nice=19
IOSchedulingClass=2
IOSchedulingPriority=7
ExecStart=/etc/backups/run.sh

[Unit]
Description=Borg Daily Backup Timer

[Timer]
WakeSystem=false
OnCalendar=*-*-* 03:00
RandomizedDelaySec=10min

[Install]
WantedBy=timers.target

#!/bin/bash -ue

# The udev rule is not terribly accurate and may trigger our service before
# the kernel has finished probing partitions. Sleep for a bit to ensure
# the kernel is done.
#
# This can be avoided by using a more precise udev rule, e.g. matching
# a specific hardware path and partition.
sleep 5

#
# Script configuration
#
export BORG_PASSPHRASE="<secret>"
MOUNTPOINT=/mnt/backup
TARGET=$MOUNTPOINT/borg

# Archive name schema
DATE=$(date --iso-8601)

#
# Create backups
#

# Options for borg create
BORG_OPTS="--stats --compression lz4 --checkpoint-interval 86400"

# No one can answer if Borg asks these questions, it is better to just fail quickly
# instead of hanging.
export BORG_RELOCATED_REPO_ACCESS_IS_OK=no
export BORG_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK=no

# Log Borg version
borg --version

echo "Starting backup for $DATE"

echo "# system"
borg create $BORG_OPTS \
  --exclude /root/.cache \
  --exclude /var/cache \
  --exclude /var/lib/docker/devicemapper \
  --exclude 'sh:/home/*/.cache' \
  --exclude 'sh:/home/*/.cargo' \
  --exclude 'sh:/home/*/.pyenv' \
  --exclude 'sh:/home/*/.vscode-server' \
  --exclude 'sh:/home/*/.local/share/TabNine' \
  --one-file-system \
  $TARGET::'{hostname}-system-{now}' \
  / /boot

echo "# data"
borg create $BORG_OPTS \
  --exclude 'sh:/mnt/data/nextcloud/appdata_*/preview' \
  --exclude 'sh:/mnt/data/nextcloud/appdata_*/dav-photocache' \
  $TARGET::'{hostname}-data-{now}' \
  /mnt/data /mnt/ftl

echo "Start pruning"
BORG_PRUNE_OPTS="--list --stats --keep-daily 7 --keep-weekly 3 --keep-monthly 3"
borg prune $BORG_PRUNE_OPTS --prefix '{hostname}-system-' $TARGET
borg prune $BORG_PRUNE_OPTS --prefix '{hostname}-data-' $TARGET

echo "Completed backup for $DATE"

# Just to be completely paranoid
sync

ln -sf /etc/backups/borg.* /etc/systemd/system/
systemctl enable --now borg

Kubernetes

pacman -S kubeadm kubelet kubectl
systemctl enable --now kubelet
kubeadm init --pod-network-cidr='10.244.0.0/16'
cp /etc/kubernetes/admin.conf ~/.kube/config

kubectl taint nodes --all node-role.kubernetes.io/master- # to allow allocating pods to the master node

# setup flannel network manager
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

# setup nginx ingress controller
# TODO

kubectl cluster-info
kubectl get nodes
kubectl get pods -A
kubectl get cm -n kube-system kubeadm-config -o yaml

Kubernetes - ArchWiki

Kubernetes Ingress Controller with NGINX Reverse Proxy and Wildcard SSL from Let's Encrypt - Shogan.tech

certs

pacman -S certbot certbot-dns-cloudflare
echo "dns_cloudflare_api_token = <token>" > ~/.secrets/certbot/cloudflare.ini
chmod 600 ~/.secrets/certbot/cloudflare.ini
certbot certonly \
  --email y@uechi.io \
  --agree-tos \
  --dns-cloudflare \
  --dns-cloudflare-credentials ~/.secrets/certbot/cloudflare.ini \
  -d "*.uechi.io"
openssl x509 -in /etc/letsencrypt/live/uechi.io/fullchain.pem -text
certbot certificates

[Unit]
Description=Let's Encrypt renewal

[Service]
Type=oneshot
ExecStart=/usr/bin/certbot renew --quiet --agree-tos --deploy-hook "docker exec nginx-proxy-le /app/signal_le_service"

[Unit]
Description=Twice daily renewal of Let's Encrypt's certificates

[Timer]
OnCalendar=0/12:00:00
RandomizedDelaySec=1h
Persistent=true

[Install]
WantedBy=timers.target

audio

pacman -S alsa-utils # maybe requires reboot
arecord -L # list devices

pcm.m96k {
  type hw
  card M96k
  rate 44100
  format S32_LE
}

pcm.!default {
  type plug
  slave.pcm "m96k"
}

arecord -vv /dev/null # test mic
alsamixer # gui mixer

Maintenance

systemctl --failed
free -h
htop
lsblk -f
nvidia-smi
iotop
sensors
journalctl -p err
networkctl status