ph域名网站国产搜什么关键词最好看

🔥Linux下常用软件安装_JDK和Tomcat安装

Jdk 安装

解压jdk安装包

tar -zxvf jdk-8u201-linux-x64.tar.gz -C/usr/local

配置环境变量

vim /etc/profile
底部加入如下配置
export JAVA_HOME=/usr/local/jdk
export PATH=$PATH:$JAVA_HOME/bin

生效环境变量

source /etc/profile

Tomcat 安装

解压Tomcat安装包

tar -zxvf apache-tomcat-9.0.54.tar.gz -C/usr/local

配置环境变量

export TOMCAT_HOME=/usr/local/tomcat
export PATH=$PATH:$TOMCAT_HOME/bin:$JAVA_HOME/bin

🔥Linux下常用软件安装_MySQL安装

下载YUM库

wget http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm

安装YUM库

rpm -ivh mysql57-community-release-el7-10.noarch.rpm

安装数据库

yum -y install mysql-community-server

遇到报错

Failing package is: mysql-community-libs-compat-5.7.37-1.el7.x86_64GPG Keys are configured as:
file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

失败原因：

GPG对于包的源key的验证没有通过。

解决办法

在yum install 版本后面加上 --nogpgcheck

yum -y install mysql-community-server -- nogpgcheck

完成安装，重启mysql

systemctl restart mysqld

此时MySQL已经开始正常运行，不过要想进入MySQL还得先找出此时root用户的密码，通过如下命令可以在日志文件中找出密码：

grep "password" /var/log/mysqld.log
[root@hadoop8 ~]# grep "password" /var/log/mysqld.log 2018-10 13T08:33:27.994868Z 1 [Note] Atemporary password is generated for
root@localhost: yj0v.0w*ywPk

复制粘贴上边的密码进入数据库

mysql -uroot -p

输入初始密码，此时不能做任何事情，因为MySQL默认必须修改密码之后才能操作数据库修改密码命令：

ALTER USER 'root'@'localhost' IDENTIFIED BY
'123456';
Your password does not satisfy the current
policy requirements

解决报错

修改密码策略

因为当前的密码太复杂不方便后期做实验，所以使用命令修改密码策略两种方式：

mysql> set global validate_password_policy=0;
Query OK, 0 rows affected (0.00 sec)
mysql> set global validate_password_policy=LOW;
Query OK, 0 rows affected (0.00 sec)
mysql> SET GLOBAL validate_password_length=6;
Query OK, 0 rows affected (0.00 sec)
注：执行完初始化命令后需要输入数据库root用户密码
注：密码策略分四种
1、OFF（关闭） 2、LOW（低） 3、MEDIUM（中） 4、STRONG（强）

修改密码

ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';

开启远程连接

select User,Host,Password from user;
update user set host ="%" where user = “root”
刷新信息
mysql> flush privileges;

🔥Linux下常用软件安装_MySQL卸载

检查是否安装了MySQL组件。

[root@localhost ~]# rpm -qa | grep -i mysql
mysql57-community-release-el7-10.noarch
mysql-community-libs-5.7.36-1.el7.x86_64
mysql-community-server-5.7.36-1.el7.x86_64
mysql-community-common-5.7.36-1.el7.x86_64
mysql-community-client-5.7.36-1.el7.x86_64
mysql-community-libs-compat-5.7.36-1.el7.x86_64

卸载前关闭MySQL服务

systemctl stop mysqld
systemctl status mysqld

收集MySQL对应的文件夹信息

whereis mysql
mysql: /usr/bin/mysql /usr/lib64/mysql/usr/share/mysql/usr/share/man/man1/mysql.1.gz

卸载删除MySQL各类组件

rpm -ev --nodeps mysql57-community-release-el7-10.noarch
rpm -ev --nodeps mysql-community-libs-5.7.36-1.el7.x86_64
rpm -ev --nodeps mysql-community-server-5.7.36-1.el7.x86_64
rpm -ev --nodeps mysql-community-common-5.7.36-1.el7.x86_64
rpm -ev --nodeps mysql-community-client-5.7.36-1.el7.x86_64
rpm -ev --nodeps mysql-community-libs-compat-5.7.36-1.el7.x86_64

删除MySQL对应的文件夹

[root@DB-Server init.d]# whereis mysql
mysql:
[root@DB-Server init.d]# find / -name mysql/var/lib/mysql/var/lib/mysql/mysql/usr/lib64/mysql
[root@DB-Server init.d]# rm -rf/var/lib/mysql
[root@DB-Server init.d]# rm -rf/var/lib/mysql/mysql
[root@DB-Server init.d]# rm -rf/usr/lib64/mysql

删除mysql用户及用户组

[root@DB-Server init.d]# rpm -qa | grep -imysql