CentOS7 Operation and Maintenance-System Basic Optimization Encyclopedia
1. Replace Yum source
The download speed of the official Yum source is slow, and the domestic source is recommended
►Domestic source address
Alibaba Cloud | NetEase | University of Science and Technology of China
①Backup source
cd /etc/yum.repos.d/
mkdir bak
mv *.repo bak/
②Download Ali yum source
wget -nc http://mirrors.aliyun.com/repo/Centos-7.repo
③Change the Ali yum source to the default source
mv Centos-7.repo CentOS-Base.repo
④Update the local yum cache
yum clean all && yum makecache
Second, the firewall
►Set up firewall as required
①Turn off the firewall temporarily
►It will be turned on after restart
systemctl stop firewalld.service
②Turn off the firewall permanently
►Restart will not turn on
systemctl disable firewalld.service
③Close SELinux
SELinuxIs a security subsystem, used to reduce the resources accessible by the service process in the system
►Temporary closure
setenforce 0
►Permanently closed
vim /etc/selinux/config
Found SELINUX=enforcingto be changed todisabled
Three, optimize the command prompt
① Through PS1 environment variables
►Common parameters
| Serial number | parameter | meaning |
|---|---|---|
| 1 | \d | Represents the date, the format is week, month, day |
| 2 | \H | Full host name |
| 3 | \h | Take only the first name of the host |
| 4 | \t | Display time in 24-hour format |
| 5 | \T | Display time in 12-hour format |
| 6 | \A | Display time in 24-hour format |
| 7 | \ u | The account name of the current user |
| 8 | \ v | BASH version information |
| 9 | \w | Full directory name |
| 10 | \W | Use basename to get the name of the working directory, so only the last directory name will be listed |
| 11 | # | What order was issued |
| 12 | $ | Prompt character, if it is root, the prompt is: #, ordinary user is: $ |
►Color code
| Serial number | colour |
|---|---|
| 30 | black |
| 31 | red |
| 32 | green |
| 33 | yellow |
| 34 | blue |
| 35 | Pink |
| 36 | Light blue |
| 37 | white |
vim /root/.bashrc
PS1='\[\e[35;1m\][\t]\[\e[33;1m\][\u@\[\e[37;20m\] \w]\[\e[34;1m\]\$: \[\e[m\]'
source /root/.bashrc
//刷新配置
②Through zsh
►Install zsh
sudo yum install zsh
wget https://gitee.com/mirrors/oh-my-zsh/raw/master/tools/install.sh
chmod +x install.sh
./install.sh
►Configure zsh
vim ~/.zshrc
Find and ZSH_THEME="robbyrussell"modify it toagnoster
