1、Linux配置Java環境
CentOS系統默認是帶有yum（軟件包依賴管理工具）的，Ubuntu是apt，macOS是homebrew
yum -y update 升級所有包同時也升級軟件和系統內核
yum -y upgrade 只升級所有包，不升級軟件和系統內核
安裝之前先檢查一下系統有沒有自帶open-jdk
rpm -qa |grep java
rpm -qa |grep jdk
rpm -qa |grep gcj
如果沒有輸入信息表示沒有安裝。
如果安裝可以使用 rpm -qa | grep java | xargs rpm -e --nodeps 批量卸載所有帶有Java的文件 這句命令的關鍵字是java
yum list java* 檢索包含java的列表
yum install java-1.8.0-openjdk* -y 安裝1.8.0的所有文件
java -version 檢查是否安裝成功（yum安裝都不用配置環境變量）
2、Linux配置MySQL
yum安裝MySQL，主要是3個包
mysql-devel 開發用到的庫以及包含文件
mysql mysql 客戶端
mysql-server 數據庫服務器
安裝之前，先說收如何徹底卸載MySQL
用命令rpm -qa|grep -i mysql查看已經安裝的MySQL安裝包，在列表中逐個卸載
yum remove mysql mysql-server mysql-libs compat-mysql51
rm -rf /var/lib/mysql
rm /etc/my.cnf
查看以前是否安裝過
yum list installed mysql*
rpm -qa | grep mysql*
安裝MySQL
yum install mysql
yum install mysql-server
yum install mysql-devel
配置MySQL
[root@wood /]# cat /etc/my.cnf
[client]
default-character-set=utf8
[mysql]
default-character-set = utf8
[mysqld]
character_set_server=utf8
character_set_client=utf8
collation-server=utf8_general_ci
max_connections=100
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
開機啟動 MySQL
chkconfig -add mysqld
啟動、停止 MySQL
service mysqld start
service mysqld stop
service mysqld restart
第一次啟動會彈出
[root@wood ~]# service mysqld start
Initializing MySQL database: Installing MySQL system tables...
OK
Filling help tables...
OK
To start mysqld at boot time you have to copy
support-files/mysql.server to the right place for your system
PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:
/usr/bin/mysqladmin -u root password 'new-password'
/usr/bin/mysqladmin -u root -h wood password 'new-password'
Alternatively you can run:
/usr/bin/mysql_secure_installation
which will also give you the option of removing the test
databases and anonymous user created by default. This is
strongly recommended for production servers.
See the manual for more instructions.
You can start the MySQL daemon with:
cd /usr ; /usr/bin/mysqld_safe &
You can test the MySQL daemon with mysql-test-run.pl
cd /usr/mysql-test ; perl mysql-test-run.pl
Please report any problems with the /usr/bin/mysqlbug script!
設置管理員密碼
設置mysql管理員密碼
/usr/bin/mysqladmin -u root password 'new-password'
/usr/bin/mysqladmin -u root -h localhost password 'new-password'
配置mysql安裝向導
/usr/bin/mysql_secure_installation
修改localhost，任何IP都可以遠程訪問mysql服務器
更改 "mysql" 數據庫里的 "user" 表里的 "host" 項，從"localhost"改成"%"
mysql>use mysql;
mysql>update user set host = '%' where user = 'root';
mysql>select host, user from user;
mysql>FLUSH PRIVILEGES;
為了安全，我是這樣設置的
話說IP怎么查？
