How to install jdk and mysql on centos

1: Environment

2: Download the jdk rpm package locally and upload it to the server (because of this I just started using wget to download directly to the server, and the installation kept reporting errors, so I decided to use this stupid method)

Download address:

jdk is installed by default In /usr/java

Three: Configure environment variables

My machine has installed jdk-8u151-linux-x64 After .rpm, the java –version operation can be performed normally without configuring environment variables, so I did not configure the jdk environment variables. But for the sake of future discomfort, here is a record of how to configure it. The operation is as follows:

Modify the system environment variable file

vi  /etc/profile

Append the following content to the file:

java_home=/usr/java/jdk1.8.0_151

jre_home=/usr/java/jdk1.8.0_151/jre

path=$path:$java_home/bin:$ jre_home/bin

classpath=.:$java_home/lib/dt.jar:$java_home/lib/tools.jar:$jre_home/libexport java_home jre_home path classpath

Make the modification effective

[root@localhost ~]# source /etc/profile  //使修改立即生效
[root@localhost ~]#echo $path  //查看path值

Check the system environment status

[root@localhost ~]# echo $path
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/usr/java/jdk1.8.0_25/bin:/usr/java/jdk1.8.0_25/jre/bin

Four: Install mysql (download and install mysql-server from the official website)

# wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
# rpm -ivh mysql-community-release-el7-5.noarch.rpm
# yum install mysql-community-server

Restart the mysql service after successful installation.

# service mysqld restart

When installing mysql for the first time, the root account does not have a password.

Set password

mysql> set password for 'root'@'localhost' =password('password');
query ok, 0 rows affected (0.00 sec)
mysql>

Five: Configure mysql

1, encoding

The mysql configuration file is /etc/my.cnf

Finally add the encoding configuration

[mysql]
default-character-set =utf8

The character encoding here must be consistent with /usr/share/mysql/charsets/index.xml.

2. Remote connection settings

Assign all permissions of all tables in all databases to the root user located at all IP addresses.

mysql> grant all privileges on *.* to root@'%'identified by 'password';

If it is a new user instead of root, you must first create a new user

mysql>create user 'username'@'%' identified by 'password';

Then you can connect remotely.

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