Initial installation of linx7.5

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Blog address : https://blog.51cto.com/13718453/2468398
github
dockerhub

Modify hostname ：
hostnamectl set-hostname node01.magedu.com

root The code forgot ：centos7
https://blog.51cto.com/13718453/2468388

Close graphical interface ：centos7
https://blog.51cto.com/13718453/2468380

centos7.5 Modify the network card name ：
https://blog.51cto.com/13718453/2468415
eth0:
DEVICE=eth0
BOOTPROTO=static
IPADDR=192.168.100.1
PREFIX=24
DNS=114.114.114.114
eth1:
DEVICE=eth1
BOOTPROTO=dhcp

secureCrt time out :
secureCrt ssh vm ( Because only the mainframe , There is a problem with the defined network segment , This machine ping It doesn't work ）
ping: www.baidu.com: Name or service not known Solution
https://blog.csdn.net/weixin_41045798/article/details/88694878

Default route ：
route del default
route add default gw 192.168.0.1 eth1
192.168.0.104/24 （ Bridge segment )
Domain name resolution ：cat /etc/resolv.conf

yum epel Warehouse ：
vim /etc/yum.repos.d/epel.repo
[epel]
name=epel
baseurl=https://mirrors.aliyun.com/epel/$releasever/x86_64/
gpgcheck=0

Create user ：
useradd admin
echo centos |passwd --stdin admin
visudo
admin ALL=(ALL) NOPASSWD: ALL
Add user group ：
useradd -g wheel admin

history
vim ~/.bash_profile
export HISTTIMEFORMAT="%F %T whoami " Here's the insertion of whoami The operating user used to display the command
export HISTSIZE=100000
export HISTFILESIZE=20000
export HISTTIMEFORMAT="%F %T whoami hostname "

Log cleanup command ：
find / -mount -type f -size +100M |xargs -i du -sh {}|sort -nr

vim:
%s/137/100/g
[root@node4~]#cat ~/.vimrc
set nu
set cul
set ai
set paste
set ic
set ai

hosts:
[root@node01 ~]# cat /etc/hosts
192.168.100.40 node04.magedu.com node04 node04
192.168.100.30 node03.magedu.com node03 node03
192.168.100.20 node02.magedu.com node02 node02
192.168.100.10 node01.magedu.com node01 node01

Upload and download ：
yum -y install lrzsz
secure crt No secret connection Virtual machines ;

1、cd .ssh/

2、ssh-keygen

3、 cat id_rsa.pub >> authorized_keys

4、chmod 600 authorized_keys

5、chmod 700 ~/.ssh

6、[root@node01 ~]# cat /etc/ssh/sshd_config |grep -i PermitRootLogin#PermitRootLogin

#PermitRootLogin yes

7、sz id_rsa

Host name ：
hostnamectl set-hostname node01.magedu.com
cat /etc/sysconfig/network-scripts/ifcfg-ens33
Unclassified ：

ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
iplist
192.168.100.10 root centos
192.168.100.20 root centos
192.168.100.30 root centos
192.168.100.40 root centos

#/bin/bash
rpm -q expect &> /dev/null || yum install expect -y &> /dev/null
ssh-keygen -t rsa -P '' -f /root/.ssh/id_rsa &> /dev/null && echo " ssh key is created"
while read line;do
ip=echo $line |awk '{print $1}'
user=echo $line |awk '{print $2}'
password=echo $line |awk '{print $3}'
expect <<EOF
set timeout 50
spawn ssh-copy-id -i /root/.ssh/id_rsa.pub $user@$ip
expect {
"yes/no" { send "yes\n";exp_continue }
"password" { send "$password\n" }
}
expect eof
EOF
echo "$ip is finished"
done < iplist