Linux安装mysql、nginx、jdk

Mysql安装

rpm -qa|grep -i mysql

rpm -qa | grep -i mariadb

先卸载

rpm -e --nodeps mariadb-libs-5.5.44-2.el7.x86_64。/// yum remove mysql

完全卸载：rpm -qa|grep -i mysql

删除：rpm -ev --nodeps mysql-community-common-5.7.28-1.el7.x86_64 mysql-community-client-5.7.28-1.el7.x86_64 mysql-community-libs-5.7.28-1.el7.x86_64 mysql-community-server-5.7.28-1.el7.x86_64 mysql57-community-release-el7-8.noarch

whereis mysql

find / -name mysql

rm -rf 

rm -f /etc/my.cnf

下载yum的rpm包    wget http://repo.mysql.com/mysql57-community-release-el7-8.noarch.rpm

安装rpm包    rpm -ivh mysql57-community-release-el7-8.noarch.rpm

安装mysql服务    yum -y install mysql-server

 

systemctl enable mysqld.service

systemctl start/status/stop mysqld.service

查看已启动：systemctl list-unit-files |grep enabled

加入启动：  systemctl enable mysqld.service

免密登陆登陆之后修改root密码；

1. 在/etc/my.cnf.   新增一行

skip-grant-tables

2. 重启systemctl restart mysqld.service

3. 登陆数据库mysql -uroot -p

4. mysql> use mysql;

5. mysql> update mysql.user set authentication_string=password('xxxx') where user='root';

6. mysql> flush privileges;

7. mysql> exit;

8. 编辑/etc/my.cnf 删除哪一行，然后重启systemctl restart mysqld.service

9. 登陆mysql mysql -u root -proot

配置root外网登陆

mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root' WITH GRANT OPTION;

ERROR 1819 (HY000): Your password does not satisfy ...意思是你的密码强度太低

不要紧输入下面代码改变密码强度限制

mysql>set global validate_password_policy=0;

再输入下面代码把密码强度设置成最少4位

mysql>set global validate_password_length=4;

更新授权表，使更改生效

mysql>flush privileges;

这时再用navicat连接mysql数据库就成功了~

 

配置完成MySQL-5.7.22，修改第一次密码并登陆后，不论输入什么语句，都出现提示“You must reset your password using ALTER USER...”的提示错误语句，解决办法如下：（好像是一个密码过期的校验，设置为不过期就可以）

SET PASSWORD = PASSWORD('kangsichuang2017..');

ALTER USER 'root'@'localhost' PASSWORD EXPIRE NEVER;

FLUSH PRIVILEGES;

quit后，重新使用新密码登陆即可进行操作了。

 

如果配置好登陆报密码的错误：请记得在运行：

4. mysql> use mysql;

5. mysql> update mysql.user set authentication_string=password('xxxx') where user='root';

6. mysql> flush privileges;

7. mysql> exit;

 

Nginx yum安装：

然后我们关于nginx的rpm包

搜索一下yum库：    yum list | grep nginx

nginx-filesystem.noarch                     1.10.2-1.el6                 @epel  

collectd-nginx.x86_64                       4.10.9-4.el6                 epel   

munin-nginx.noarch                          2.0.33-1.el6                 epel   

nginx.x86_64                                1.10.2-1.el6                 epel   

nginx-all-modules.noarch                    1.10.2-1.el6                 epel   

nginx-mod-http-geoip.x86_64                 1.10.2-1.el6                 epel   

nginx-mod-http-image-filter.x86_64          1.10.2-1.el6                 epel   

nginx-mod-http-perl.x86_64                  1.10.2-1.el6                 epel   

nginx-mod-http-xslt-filter.x86_64           1.10.2-1.el6                 epel   

nginx-mod-mail.x86_64                       1.10.2-1.el6                 epel   

nginx-mod-stream.x86_64                     1.10.2-1.el6                 epel   

pcp-pmda-nginx.x86_64                       3.10.9-9.el6                 os

接下来我们选择使用yum安装nginx.x86_64 1.10.2-1.el6 epel

yum install nginx

中间会提示我们一次是否确认安装- 输入y确定

安装完毕！！接下来我们来看一下nginx的文件分布

[root@VM_239_130_centos html]# whereis nginx

nginx: /usr/sbin/nginx /etc/nginx /usr/lib64/nginx /usr/local/nginx /usr/share/nginx /usr/share/man/man3/nginx.3pm.gz /usr/share/man/man8/nginx.8.gz

其中三个文件（夹）比较重要：

路径                     作用

/usr/sbin/nginx         nginx启动路径

/etc/nginx              存放nginx的配置文件

/usr/share/nginx        默认的nginx资源库

 

查看 systemd 开机自启服务

systemctl list-unit-files |grep enabled

 

开启开机启动

systemctl enable nginx.service

 

用命令关掉nginx

pkill -9 nginx

 

后面可以用systemctl来操作nginx.service

systemctl start nginx.service

 

 

JDK安装

yum list java-1.8*

yum install java-1.8.0-openjdk.x86_64 -y

java -version