CentOS、Ubuntu minimal install 配置调优

1、网卡名称更改为eth*

　　centos：

 1 [root@CentOS7 ~]# cat /etc/default/grub
 2 GRUB_TIMEOUT=5
 3 GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
 4 GRUB_DEFAULT=saved
 5 GRUB_DISABLE_SUBMENU=true
 6 GRUB_TERMINAL_OUTPUT="console"
 7 GRUB_CMDLINE_LINUX="crashkernel=auto spectre_v2=retpoline rhgb quiet net.ifnames=0 biosdevname=0"   #增加net.ifnames=0 biosdevname=0
 8 GRUB_DISABLE_RECOVERY="true"
 9 [root@CentOS7 ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens33    #更改网卡配置文件
10 TYPE="Ethernet"
11 PROXY_METHOD="none"
12 BOOTPROTO="static"
13 DEFROUTE="yes"
14 NAME="eth0"           #更改NAME名称为eth0
15 DEVICE="eth0"         #更改DEVICE名称为eth0
16 ONBOOT="yes"
17 IPADDR=10.0.0.7
18 NETMASK=255.255.255.0
19 GATEWAY=10.0.0.2
20 DNS1=10.0.0.2
21 [root@CentOS7 ~]# mv /etc/sysconfig/network-scripts/ifcfg-ens33 /etc/sysconfig/network-scripts/ifcfg-eth0   #修改网卡配置文件名称为eth0
22 [root@CentOS7 ~]# grub2-mkconfig -o /boot/grub2/grub.cfg            #重新生成gurb配置并更新内核
23 Generating grub configuration file ...
24 Found linux image: /boot/vmlinuz-3.10.0-1160.el7.x86_64
25 Found initrd image: /boot/initramfs-3.10.0-1160.el7.x86_64.img
26 Found linux image: /boot/vmlinuz-0-rescue-67a276dba63741a08afb2f95b256dbcc
27 Found initrd image: /boot/initramfs-0-rescue-67a276dba63741a08afb2f95b256dbcc.img
28 done
29 [root@CentOS7 ~]# reboot   #重启系统
30 [root@CentOS7 ~]# ip a     #验证网卡名称
31 1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
32     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
33     inet 127.0.0.1/8 scope host lo
34        valid_lft forever preferred_lft forever
35     inet6 ::1/128 scope host
36        valid_lft forever preferred_lft forever
37 2: eth0:  mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
38     link/ether 00:0c:29:dc:98:a8 brd ff:ff:ff:ff:ff:ff
39     inet 10.0.0.7/24 brd 10.0.0.255 scope global noprefixroute eth0
40        valid_lft forever preferred_lft forever
41     inet6 fe80::20c:29ff:fedc:98a8/64 scope link
42        valid_lft forever preferred_lft forever

　　Ubuntu：

wang@Ubuntu1804:~$ sudo vim /etc/default/grub
[sudo] password for wang:
wang@Ubuntu1804:~$ cat /etc/default/grub
GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=2
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0"       #增加net.ifnames=0 biosdevname=0
wang@Ubuntu1804:~$ sudo update-grub                    #重新生成grub配置并更新内核
Sourcing file `/etc/default/grub'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.15.0-112-generic
Found initrd image: /boot/initrd.img-4.15.0-112-generic
done
wang@Ubuntu1804:~$ sudo reboot                         #重启系统
wang@Ubuntu1804:~$ ifconfig                            #验证网卡名称
eth0: flags=4163  mtu 1500
        inet 10.0.0.9  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::20c:29ff:fecf:1d8e  prefixlen 64  scopeid 0x20
        ether 00:0c:29:cf:1d:8e  txqueuelen 1000  (Ethernet)
        RX packets 227  bytes 47655 (47.6 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 193  bytes 21708 (21.7 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 26  bytes 2530 (2.5 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 26  bytes 2530 (2.5 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

2、修改yum源

• 阿里镜像站点：https://developer.aliyun.com/mirror/

• 清华大学镜像站点：https://mirrors.tuna.tsinghua.edu.cn/

• 网易云镜像站点：http://mirrors.163.com/

　　centos配置阿里yum源：

centos7:
  [root@CentOS7 ~]# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup   #备份
  [root@CentOS7 ~]# curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo  #下载新的 CentOS-Base.repo 到 /etc/yum.repos.d/
  [root@CentOS7 ~]# yum makecache  #运行yum makecache生成缓存

centos8：
  [root@CentOS8 ~]# mv /etc/yum.repos.d/CentOS-Linux-BaseOS.repo /etc/yum.repos.d/CentOS-Linux-BaseOS.repo.backup
  [root@CentOS8 ~]# curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-8.repo
  [root@CentOS8 ~]# yum makecache

　　Ubuntu1804配置清华大学镜像源：

 1   wang@Ubuntu1804:/etc/apt$ sudo mv /etc/apt/sources.list /etc/apt/sources.list.backup
 2   wang@Ubuntu1804:/etc/apt$ sudo vim /etc/apt/sources.list
 3   wang@Ubuntu1804:/etc/apt$ cat /etc/apt/sources.list
 4   # 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
 5   deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
 6   # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
 7   deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
 8   # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
 9   deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
10   # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
11   deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
12   # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
13 
14   # 预发布软件源，不建议启用
15   # deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
16   # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
17   wang@Ubuntu1804:/etc/apt$ sudo apt update

3、安装常用软件包：

　　centos：

  # yum -y install gcc make gcc-c++ glibc glibc-devel pcre pcre-devel openssl openssl-devel systemd-devel zlib-devel vim lrzsz tree tmux lsof tcpdump wget net-tools iotop bc bzip2 zip unzip nfs-utils man-pages redhat-lsb-core postfix mailx bash-completion man-pages

　　Ubuntu：

  $ sudo apt -y purge ufw lxd lxd-client lxcfs lxc-common
  $ sudo apt -y install iproute2 ntpdate tcpdump telnet traceroute nfs-kernel-server nfs-common lrzsz tree openssl libssl-dev libpcre3 libpcre3-dev zlib1g-dev ntpdate tcpdump telnet traceroute gcc openssh-server lrzsz tree openssl libssl-dev libpcre3 libpcre3-dev zlib1g-dev ntpdate tcpdump telnet traceroute iotop unzip zip

4、配置ssh服务：

　　CentOS7：

  # sed -i.bak -e 's/#UseDNS yes/UseDNS no/' -e 's/GSSAPIAuthentication yes/GSSAPIAuthentication no/' /etc/ssh/sshd_config
  # systemctl restart sshd

　　CentOS8：

  # sed -i.bak -e 's/#UseDNS no/UseDNS no/' -e 's/GSSAPIAuthentication yes/GSSAPIAuthentication no/' /etc/ssh/sshd_config
  # systemctl restart sshd

　　Ubuntu：

$ vim /etc/ssh/sshd_config
  #PermitRootLogin prohibit-password
  PermitRootLogin yes   #允许root用户登录
  #UseDNS no
  UseDNS no             #关闭DNS解析
$ sudo vim /etc/ssh/sshd_config
$ sudo su - root
# passwd
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
# systemctl restart sshd

5、centos禁用selinux及关闭防火墙

# sed -ri.bak 's/^(SELINUX=).*/\1disabled/' /etc/selinux/config
# systemctl disable --now firewalld

6、设置.vimrc

#!/bin/bash
#

UserName=your name
QQ=your QQ
UserURL=your URL


set_vimrc(){

cat >.vimrc <=4
set expandtab
set ignorecase
autocmd BufNewFile *.sh exec ":call SetTitile()"
func SetTitile()
    if expand("%:e") == 'sh'
    call setline(1,"#!/bin/bash")
    call setline(2,"#")
    call setline(3,"#*************************************************************************************")
    call setline(4,"#Author:                    $UserName")
    call setline(5,"#QQ:                        $QQ")
    call setline(6,"#Date:                        ".strftime("%Y-%m-%d"))
    call setline(7,"#FileName                    ".expand("%"))
    call setline(8,"#URL:                        $UserURL")
    call setline(9,"#Description:                The test script")
    call setline(10,"#Copyreght (C):                ".strftime("%Y")." All rightsreserved")
    call setline(11,"#*************************************************************************************")
    call setline(12,"")
    endif
endfunc
autocmd BufNewFile * normal G
EOF
echo -e "\e[1;31m vimrc设置完成 \e[0m"

}

set_vimrc