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
   
   ?

   1 2 3

   \S (Terminal: \l) Kernel: \r  ==  Platform: \m  ==  Hostname: \n Date: \d \t