将防火墙关闭并设置为开机不自动启动：
systemctl stop firewalld.service
systemctl disable firewalld.service
Linux系统中JDK的安装与配置
进入opt目录下 ：cd /opt
在opt目录下上传jdk文件 ：jdk-8u152-linux-x64.tar.gz
解压 ：tar -zxvf jdk-8u152-linux-x64.tar.gz
进入etc目录下：cd /etc
备份：cp profile profile.bak
修改：vim profile
大写G，进入文件末尾，输入i进行修改模式，末尾添加以下配置：
JAVA_HOME=/opt/jdk1.8.0_152
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME PATH然后保存退出：按Esc+：wq
执行当前连接刚刚配置的脚本文件使配置文件生效：source /etc/profile 或者reboot重启
查看jdk版本：java -version
java version "1.8.0_152"
Java(TM) SE Runtime Environment (build 1.8.0_152-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.152-b16, mixed mode)查看：path路径：echo $PATH
/opt/jdk1.8.0_152/bin:/opt/jdk1.8.0_152/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin查看：JAVA_HOME路径：echo $JAVA_HOME
/opt/jdk1.8.0_152Tomcat安装与配置
进入opt目录：cd /opt
在opt目录下上传apache-tomcat-8.5.24.tar.gz
解压： tar -zxvf apache-tomcat-8.5.24.tar.gz
启动tomcat： /opt/apache-tomcat-8.5.24/bin/startup.sh
如果报错进入logs目录查看：cd /opt/apache-tomcat-8.5.24/logs
查看日志：less catalina.out
MySQL的安装与配置
进入opt目录：cd /opt
在opt目录下上传MySQL-server-5.5.52-1.el6.x86_64.rpm和MySQL-client-5.5.52-1.el6.x86_64.rpm
忽略依赖关系执行删除：rpm -e --nodeps mariadb-libs-1:5.5.56-2.el7.x86_64
安装服务端：rpm -ivh /opt/MySQL-server-5.5.52-1.el6.x86_64.rpm
安装客户端：rpm -ivh /opt/MySQL-client-5.5.52-1.el6.x86_64.rpm
查看版本：mysqladmin --version
mysqladmin Ver 8.42 Distrib 5.5.52, for Linux on x86_64
启动MySQL服务：systemctl start mysql.service
查看服务状态：systemctl status mysql.service
查看端口：netstat -anp|grep 3306
查看mysql运行的进程：ps -ef|grep mysql|grep -v grep
设置root用户和密码：mysqladmin -u root password
New password:
Confirm new password:
登录mysql：mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 3
Server version: 5.5.52 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql>
查看数据库：show databases;
使用test数据库：user test;
查看表：show tables;
退出：exit；
然后去windows的sqlYog连接，主机改为linux连接：192.168.134.100，用户名：root，密码：root
测试连接不上，linux中查看防火墙：systemctl status firewalld.service
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
Active: inactive (dead)
Docs: man:firewalld(1)
8月 12 07:32:47 rich systemd[1]: Starting firewalld - dynamic firewall daemon...
8月 12 07:32:47 rich systemd[1]: Started firewalld - dynamic firewall daemon.
8月 12 07:32:47 rich firewalld[721]: WARNING: ICMP type 'beyond-scope' is not supported by the kernel for ipv6.
8月 12 07:32:47 rich firewalld[721]: WARNING: beyond-scope: INVALID_ICMPTYPE: No supported ICMP type., ignoring for run-time.
8月 12 07:32:47 rich firewalld[721]: WARNING: ICMP type 'failed-policy' is not supported by the kernel for ipv6.
8月 12 07:32:47 rich firewalld[721]: WARNING: failed-policy: INVALID_ICMPTYPE: No supported ICMP type., ignoring for run-time.
8月 12 07:32:47 rich firewalld[721]: WARNING: ICMP type 'reject-route' is not supported by the kernel for ipv6.
8月 12 07:32:47 rich firewalld[721]: WARNING: reject-route: INVALID_ICMPTYPE: No supported ICMP type., ignoring for run-time.
8月 12 09:30:57 rich systemd[1]: Stopping firewalld - dynamic firewall daemon...
8月 12 09:30:59 rich systemd[1]: Stopped firewalld - dynamic firewall daemon.防火墙关了，没问题，应该是mysql授权问题
登录mysql：mysql -u root -p
查看数据库：show databases;
使用mysql数据库：user mysql;
查看表：show tables;
查看用户表：select host,user,password from user;
插入一条数据到用户表中（密码复制localhost的密码）：insert into user(host,user,password) values('%','root','81F5E21E35407D884A6CD4A731AEBFB6AF209E1B');
为root授权： GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY'root' WITH GRANT OPTION;
Query OK, 0 rows affected (0.00 sec)退出mysql：mysql exit;
重启mysql服务：service mysql restart；或者systemctl restart mysql.service
Shutting down MySQL... SUCCESS!
Starting MySQL.. SUCCESS! 去windows的sqlYog连接，连接成功！