Linux Initialization

  

Universal:

  1. Disable Bell In the Terminal
    sed -i '/bell-style none/c \set bell-style none' /etc/inputrc

     

Ubuntu:　　

  1. Setup Fountain
     
    sed -i 's@http://.*.ubuntu.com@http://mirrors.aliyun.com@g' /etc/apt/sources.list
OR
sed -i -e 's/archive.ubuntu.com/mirrors.aliyun.com/g' -e 's/security.ubuntu.com/mirrors.aliyun.com/g' /etc/apt/sources.list 
  2. Install Basic Software
     
    apt install ca-certificates lsb-release software-properties-common tree apt-file net-tools info

  3.  Collocation Environ (Workstation)

    printf "%-8s %-25s %-4s %s\n" @@@@@ ~/.profile '==>' Commence
printf "%-8s %-25s %-4s %s\n" @@@@@ ~/.profile '==>' Closure
printf "%-8s %-25s %-4s %s\n" @@@@@ ~/.bashrc '==>' Commence
printf "%-8s %-25s %-4s %s\n" @@@@@ ~/.bashrc '==>' Closure
printf "%-8s %-25s %-4s %s\n" @@@@@ /etc/profile '==>' Commence
printf "%-8s %-25s %-4s %s\n" @@@@@ /etc/profile '==>' Closure
printf "%-8s %-25s %-4s %s\n" @@@@@ /etc/bash.bashrc '==>' Commence
printf "%-8s %-25s %-4s %s\n" @@@@@ /etc/bash.bashrc '==>' Closure
printf "%-8s %-25s %-4s %s\n" @@@@@ /etc/profile.d/init.sh '==>' ^_^ 

  4. locale 

    ll /usr/share/i18n
dpkg -L locales
dpkg-reconfigure locales
update-locale ==> /etc/default/locale
update-locale --reset
update-locale LANG=en_US.UTF-8 LANGUAGE=en_US.UTF-8 

  5. Remove Redundant Kernel

    uname -a
dpkg --get-selections | grep linux
dpkg --get-selections | grep -e 'linux.*36' -e 'linux.*43' | awk '{print $1}' | xargs dpkg --purge

  6. Clear Caches i.e. Firefox ( Workstation ) 

    rm -rf  /home/flail/.mozilla/firefox/*.default/Cache

  7. Clear APT Caches

    apt-get autoclean
apt-get clean  # /var/cache/apt/archives/ exclude archives/lock archives/partial
rm -f /var/cache/apt/*.bin  # pkgcache.bin srcpkgcache.bin
rm -rf /var/lib/apt/lists/*
dpkg -l | grep '^rc' | awk '{print $2}' | xargs dpkg --purge  # 清除残余配置文件
  8. Disable Auto-upgrade
     
    dpkg-reconfigure unattended-upgrades

    /etc/apt/apt.conf.d/20auto-upgrades

      
  9. [Time]
NTP=time.windows.com ntp1.aliyun.com
FallbackNTP=ntp2.aliyun.com ntp3.aliyun.com
RootDistanceMaxSec=5
PollIntervalMinSec=32
PollIntervalMaxSec=2048
    timedatectl set-ntp true
systemctl --now enable systemd-timesyncd
timedatectl show | status

    　

 RHEL:  

  1.  /etc/profile.d/init.sh      初始化脚本  
    echo 'source /etc/init.d/init' >> ~/.bashrc

     

    #---------------------------------------------------------------------
# History
#---------------------------------------------------------------------
export HISTCONTROL=ignoredups
export HISTFILE=$HOME/.bash_history
export HISTFILESIZE=2000
export HISTSIZE=1000
shopt -s histappend

if unset "${HISTTIMEFORMAT}" 2>/dev/null; then
  export HISTTIMEFORMAT="$(echo -e "\e[7m$(whoami)\e[0m") %F %T>> "
  typeset -r HISTTIMEFORMAT
fi


#---------------------------------------------------------------------
# Fedora Default Editor
#---------------------------------------------------------------------
if grep -iq 'Fedora' /etc/os-release; then
  export EDITOR=/usr/bin/vim
fi


#---------------------------------------------------------------------
# Trap
#---------------------------------------------------------------------
trap 'echo -e "\U26A1 \e[30;46mCommand >>$BASH_COMMAND<< failed with error code $?\e[0m \U1F300"' ERR
trap 'echo $BASH_COMMAND > /dev/null' DEBUG


#---------------------------------------------------------------------
# PS1
#---------------------------------------------------------------------
case $(awk '/^ID/' /etc/os-release | awk -F= '{print tolower($2)}' | tr -d \") in
  centos | fedora)
    source /usr/share/git-core/contrib/completion/git-prompt.sh
esac

function lampooner() {
  if git rev-parse --git-dir >&/dev/null; then
    message=''
    # git_dir
    if [[ $(git rev-parse --is-inside-git-dir 2>/dev/null) == true ]]; then
      PS1="\[\e[1;31m\]\u\[\e[0m\]@\[\e[1;32m\]\h\[\e[0m\][\[\e[1;33m\]\t\[\e[0m\]]:\[\e[36m\](GIT_DIR)\[\e[0m\]\[\e[1;34m\]\w\[\e[0m\]\\$ "
      return 0
    fi
    # cherry-pick
    if git status 2>/dev/null | grep -q 'cherry-pick'; then
      message='|Cherry-pick'
    fi
    # rebase
    if git status 2>/dev/null | grep -q 'rebase'; then
      message+='|Rebase'
    fi
    # merge
    case $(git status --short | head -1 | cut --characters 1-2) in
    DD | AU | UD | UA | DU | AA | UU)
      message+='|Merging'
      ;;
    *)
      :
      ;;
    esac
    if git status | grep -qi conclude; then
      message+='|Resolved'
    fi
    # branch
    branch=$(git rev-parse --abbrev-ref HEAD 2>/dev/null)

    if [ "$branch" != "" ]; then
      if [ "$branch" == HEAD ]; then
        branch=$(git rev-parse --short HEAD 2>/dev/null)
        if [ $? != 0 ]; then
          branch=Lank
        fi
      fi
    fi
    PS1="\[\e[1;31m\]\u\[\e[0m\]@\[\e[1;32m\]\h\[\e[0m\][\[\e[1;33m\]\t\[\e[0m\]]:\[\e[36m\](${branch}${message})\[\e[0m\]\[\e[1;34m\]\w\[\e[0m\]\\$ "
  else
    PS1="\[\e[1;31m\]\u\[\e[0m\]@\[\e[1;32m\]\h\[\e[0m\][\[\e[1;33m\]\t\[\e[0m\]]:\[\e[1;34m\]\w\[\e[0m\]\\$ "
  fi
}

function languor() {
  if git rev-parse --git-dir >&/dev/null; then
    local msg
    msg=$(__git_ps1)
    msg=${msg:1}
    PS1="${VENV}${CONDA_PROMPT_MODIFIER}\[\e[1;31m\]\u\[\e[0m\]@\[\e[1;32m\]\h\[\e[0m\][\[\e[1;33m\]\t\[\e[0m\]]:\[\e[36m\]${msg}\[\e[0m\]\[\e[1;34m\]\w\[\e[0m\]\\$ "
  else
    PS1="${VENV}${CONDA_PROMPT_MODIFIER}\[\e[1;31m\]\u\[\e[0m\]@\[\e[1;32m\]\h\[\e[0m\][\[\e[1;33m\]\t\[\e[0m\]]:\[\e[1;34m\]\w\[\e[0m\]\\$ "
  fi
}

declare -x PROMPT_COMMAND=languor


#---------------------------------------------------------------------
# User
#---------------------------------------------------------------------
# if [[ $(id -u) -eq 0 ]]; then
#   echo -e "\U1F308\U2744\U1F319 \e[34;47mWelcome Root\e[0m \U1F31F\U1F320\U231B"
# else
#   echo "\U1F31B\U1F31F Welcome Ordinary"
# fi


#---------------------------------------------------------------------
# Completion
#---------------------------------------------------------------------
if command -v kubectl >&/dev/null; then
  source <(kubectl completion bash)
fi


#---------------------------------------------------------------------
# Distro
#---------------------------------------------------------------------
DISTRO=$(tr "[:upper:]" "[:lower:]" </etc/os-release | grep -Poi '(debian|ubuntu|red hat|centos|fedora)' | sort | uniq)
if [ -z "$DISTRO" ]; then
  DISTRO=unknow
fi

     

     

  2. 配置centos-7源
     
    # delete obsolete antique
rm -rf /etc/yum.repos.d/*
# epel
curl -so /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
# base updates extras contrib centosplus
curl -so /etc/yum.repos.d/base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/base.repo
# docker-ce
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
# kubernetes
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
yum clean all -v
yum makecache

     

  3. 禁用 firewalld NetworkManager  selinux
    systemctl mask --now firewalld  
systemctl mask --now dnsmasq
systemctl mask --now NetworkManager  

setenforce 0
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config
#关闭swap分区
swapoff -a && sysctl -w vm.swappiness=0
sed -r -i '/^[^#]*swap/ s@^@#@' /etc/fstab
echo 'vm.swappiness = 0' >> /etc/kubernetes.conf

     

  4. 安装基本软件
    yum -y install wget net-tools tree sysstat vim telnet yum-utils rsync chrony info

     

  5. 初始化分区
    UEFI

     

      

      

      

  6. 更新内核, 移除旧内核
    rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm

      

      

    yum-config-manager --disable elrepo
yum-config-manager --enable elrepo-kernel

     

     

     

      

      

      

     需先卸载原内核kernel-tools-libs kernel-tools



    检查内核

    yum check-update kernel*

     修改默认内核

     

      

     


    第一种方式

     

     

     只保留一个内核


    移除旧内核相关文件


    一个内核的相关文件

     

      

    rpm -qa kernel* | grep -v `uname -r`  # 查看当前没有使用的内核包
grub2-editenv list  # 查看默认内核
grub2-set-default 0
grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg

yum -y update --exclude=kernel\*  # 升级软件包(排除内核)

grubby --update-kernel="$(grubby --default-kernel)" --args="user_namespace.enable=1"  # 为当前内核添加参数
grubby --info="(grubby --default-kernel)"  # 查看默认内核

     

  7. 时间同步
    采用ntpdate + crond

    yum -y install ntpdate
echo "*/5 * * * * `which ntpdate` time.windows.com" >> /var/spool/cron/root
systemctl restart crond
ln -svfn /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

     

VMware 虚拟环境:      9台试验机

  1. 密钥

    ssh-keygen -t ed25519 -P '' -C ram -f ~/.ssh/id_ed25519
cat ~/.ssh/id_ed25519.pub > ~/.ssh/authorized_keys
for i in `seq 1 1 9`;do echo ram$i,192.168.8.1$i $(< /etc/ssh/ssh_host_ecdsa_key.pub) >> ~/.ssh/known_hosts;done

     

  2. /etc/hosts
    echo -e '\n\n# ratiocination' >> /etc/hosts
for i in {1..9};do echo 192.168.8.1$i ram$i >> /etc/hosts;done

     

  3. clone前, 清理 garbage
    yum clean all
rm -rf /tmp/*
> ~/.bash_history
    history -c

     

  4. 每台clone虚拟机 修改主机名,   IP


  5. /etc/issue
    \S (Terminal: \l)
Kernel: \r  ==  Platform: \m  ==  Hostname: \n
Date: \d \t

    　　

posted @ 2021-06-18 13:22  ascertain  阅读(48)  评论(0)  编辑  收藏  举报