Centos7

Centos7

查询版本

Centos版本号

cat /etc/centos-release

内核版本

uname -r

操作系统位数

getconf LONG_BIT

防火墙

查看状态

firewall-cmd --state

关闭

systemctl stop firewalld.service

取消开机启动

systemctl disable firewalld.service

SELinux

关闭(需重启)

sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config

验证

grep SELINUX=disabled /etc/selinux/config

临时关闭

setenforce 0

getenforce

vi命令

删除全部

ggdG

IP

查看

ip addr

修改

vim /etc/sysconfig/network-scripts/ifcfg-ens33

重启

systemctl restart network.service

关闭IPv6

vim /etc/sysctl.conf

保存修改

sysctl -p

时间

timedatectl status|grep 'Time zone'

设置

硬件时钟调整为与本地时钟一致

timedatectl set-local-rtc 1

时区为上海

timedatectl set-timezone Asia/Shanghai

ntpdate

安装

yum -y install ntpdate

同步

ntpdate -u ntp.aliyun.com

date

crotab

创建

crontab -e

添加

*/5 * * * * /usr/sbin/ntpdate ntp.aliyun.com > /dev/null 2>&1

service crond reload

java

jdk下载

jdk-8u131-linux-x64.tar.gz

创建目录

mkdir /usr/local/java/

解压

tar -zxvf jdk-8u131-linux-x64.tar.gz -C /usr/local/java/

设置环境变量

vim /etc/profile

生效

source /etc/profile

添加软连接

ln -s /usr/local/java/jdk1.8.0_131/bin/java /usr/bin/java

检查

java -version

sh脚本

增加环境变量引用

#!/bin/bashsource /etc/profile

赋予执行权限

chmod +x /root/autostart.sh

设置开机启动

echo \"/root/autostart.sh > /dev/null 2>&1\" >> /etc/rc.d/rc.local

chmod +x /etc/rc.d/rc.local

mysql5.7

检查mysql是否存在

rpm -qa | grep mysqlrpm -qa |grep mariadb

yum remove mariadb-libs-5.5.64-1.el7.x86_64

配置阿里云镜像

yum install wget -ywget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repoyum makecacheyum update -y

下载mysql包

wget http://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-5.7/mysql-community-server-5.7.31-1.el7.x86_64.rpmwget http://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-5.7/mysql-community-client-5.7.31-1.el7.x86_64.rpmwget http://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-5.7/mysql-community-common-5.7.31-1.el7.x86_64.rpmwget http://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-5.7/mysql-community-libs-5.7.31-1.el7.x86_64.rpm

安装依赖环境

yum install -y perl.x86_64yum install -y libaio.x86_64yum install -y net-tools.x86_64

安装mysql

rpm -ivh mysql-community-common-5.7.31-1.el7.x86_64.rpmrpm -ivh mysql-community-libs-5.7.31-1.el7.x86_64.rpmrpm -ivh mysql-community-client-5.7.31-1.el7.x86_64.rpmrpm -ivh mysql-community-server-5.7.31-1.el7.x86_64.rpm

重启mysql

service mysqld.service restart

查询默认密码

grep 'temporary password' /var/log/mysqld.log

修改远程密码

set global validate_password_policy=0;set global validate_password_length=4;set password=password('123456');update mysql.user set Host = '%' where Host = 'localhost' and User='root';flush privileges;