Java 云服务器安装（centos）

创建目录

[root@VM-0-16-centos ~]# mkdir /usr/java
mkdir: cannot create directory ‘/usr/java’: File exists
[root@VM-0-16-centos ~]# cd /usr/java
[root@VM-0-16-centos java]# ls
[root@VM-0-16-centos java]# cd ..
[root@VM-0-16-centos usr]# cd ..
[root@VM-0-16-centos /]# ls
bin boot data dev etc home lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var

https://blog.csdn.net/zalan01408980/article/details/79720806?ops_request_misc=&request_id=&biz_id=102&utm_term=%E8%85%BE%E8%AE%AF%E4%BA%91%E6%9C%8D%E5%8A%A1%E5%99%A8%E5%AE%89%E8%A3%85java&utm_medium=distribute.pc_search_result.none-task-blog-2~all~sobaiduweb~default-8-79720806.nonecase&spm=1018.2226.3001.4187

1.安装JDK(path之类的已经自动设置好了)

yum list java*

yum install java-1.8.0-openjdk* -y

2.安装MySQL

#查看所有以mysql开头的软件

yum list mysql*

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安装数据库（uiboot环境的）

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1 下载并安装MySQL官方的 Yum Repository

使用上面的命令就直接下载了安装用的Yum Repository，大概25KB的样子，然后就可以直接yum安装了。

yum -y install mysql57-community-release-el7-10.noarch.rpm

之后就开始安装MySQL服务器。

yum -y install mysql-community-server
这步可能会花些时间，安装完成后就会覆盖掉之前的mariadb。

MySQL数据库设置
首先启动MySQL

[root@localhost ~]# systemctl start mysqld.service
查看MySQL运行状态，运行状态如图：

[root@localhost ~]# systemctl status mysqld.service

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：

[root@localhost ~]# grep “password” /var/log/mysqld.log

如下命令进入数据库：

[root@localhost ~]# mysql -uroot -p