Setup Ubuntu

20.04 LTS

Start

hostnamectl set-hostname <hostname>

apt update
apt install apt apt-utils apt-transport-https \
        python-apt-common python3-apt
apt install bash coreutils sudo vim openssh-server tzdata python3 \
        openssl ca-certificates \
        diffutils colordiff \
        tar gzip bzip2 zstd \
        wget wget2 curl \
        procps htop psmisc \
        systemd cron \
        git binutils make rsync lsof make gcc
apt autoremove
systemctl restart sshd cron

ssh-keygen -t rsa -b 4096 -C "<hostname>" -f "$PWD/.ssh/id_rsa" -N ""

Disk Partition (XFS)

fdisk -l
apt install parted

parted /dev/vdb
> mklabel gpt
> mkpart primary 1 100%
> align-check optimal 1
> print
> quit

partprobe
fdisk -lu /dev/vdb
apt install xfsprogs
mkfs.xfs /dev/vdb1

blkid

`/etc/fstab`

mkdir /mnt/<point>
mount -a

limits.conf

# /etc/pam.d/su

session    required   pam_limits.so

Python

Install by apt

apt install build-essential cpp zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev \
    libssl-dev libreadline-dev libffi-dev libsqlite3-dev libbz2-dev uuid-dev
apt install python3
pip install -U pip
apt install software-properties-common
add-apt-repository ppa:deadsnakes/ppa
apt update
apt autoremove
apt install python3.11 python3.11-dev

Install from source code

cd /tmp
wget https://www.python.org/ftp/python/3.11.4/Python-3.11.4.tgz
tar xzf Python-3.11.4.tgz
cd python-3.11.4
./configure --prefix=/usr --enable-optimizations
# make -j$(cat /proc/cpuinfo | grep processor | uniq | wc -l)
make -j$(nproc)
make altinstall

Configuration

# update-alternatives --install /usr/bin/python python /usr/bin/python3.11 1
# update-alternatives --config python

pip3 install --upgrade pip pipx pipenv argcomplete
activate-global-python-argcomplete

sysctl

# /etc/sysctl.conf

vm.swappiness = 0
kernel.sysrq = 1

net.core.somaxconn = 4096
net.core.netdev_max_backlog = 4096
net.ipv4.neigh.default.gc_stale_time = 120

# see details in https://help.aliyun.com/knowledge_detail/39428.html
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_announce = 2

# see details in https://help.aliyun.com/knowledge_detail/41334.html
net.ipv4.tcp_max_syn_backlog = 4096
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_retries1 = 3
net.ipv4.tcp_retries2 = 5
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_syncookies = 1
; net.ipv4.tcp_fin_timeout = 3  # 60
; net.ipv4.tcp_tw_reuse = 1  # 0
; net.ipv4.tcp_tw_recycle = 1  # 0
; net.ipv4.tcp_keepalive_time = 60  # 7200

# net.ipv6.conf.all.disable_ipv6 = 1
# net.ipv6.conf.default.disable_ipv6 = 1
# net.ipv6.conf.lo.disable_ipv6 = 1

sysctl -p

References