CentOS7(VirtualBox) 搭建开发环境 Java,

1、配置网卡

1. 查看本机网卡信息

[root@localhost ~]# ip addre
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:71:59:70 brd ff:ff:ff:ff:ff:ff
    inet 192.168.101.59/24 brd 192.168.101.255 scope global enp0s3
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe71:5970/64 scope link 
       valid_lft forever preferred_lft forever
3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:6b:74:69 brd ff:ff:ff:ff:ff:ff
    inet 10.0.3.15/24 brd 10.0.3.255 scope global dynamic enp0s8
       valid_lft 77547sec preferred_lft 77547sec
    inet6 fe80::a00:27ff:fe6b:7469/64 scope link 
       valid_lft forever preferred_lft forever

2. 进入网卡配置信息目录

[root@localhost network-scripts]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# ll
total 240
-rw-r--r--. 1 root root   346 Dec  6 14:15 ifcfg-enp0s3
-rw-r--r--. 1 root root   310 Nov 29 18:01 ifcfg-enp0s8
-rw-r--r--. 1 root root   254 Sep 16  2015 ifcfg-lo

3. 备份要修改网卡的配置文件

[root@localhost network-scripts]# cp ifcfg-enp0s3 ifcfg-enp0s3.backup20181206
[root@localhost network-scripts]# ll
total 240
-rw-r--r--. 1 root root   346 Dec  6 14:15 ifcfg-enp0s3
-rw-r--r--. 1 root root   277 Dec  6 14:01 ifcfg-enp0s3.backup20181206

4. 修改网卡的配置：

## 打开文件(还没安装vim)：
[root@localhost network-scripts]# vi ifcfg-enp0s3

## 编辑内容如下：
TYPE=Ethernet
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=enp0s3
UUID=23e59767-4151-4a4d-9385-e4c9cc5990ad
DEVICE=enp0s3
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.101.59
GATEWAY=192.168.101.1
NETMASK=255.255.255.0

5. 重启网络服务

[root@localhost network-scripts]# systemctl restart network

6. 查看网络服务状态(Active: active.....表示为正常启动状态)

[root@localhost network-scripts]# systemctl status network
● network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network)
   Active: active (exited) since Thu 2018-12-06 16:43:32 CST; 6s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 20160 ExecStop=/etc/rc.d/init.d/network stop (code=exited, status=0/SUCCESS)
  Process: 20483 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=0/SUCCESS)

Dec 06 16:43:29 localhost.localdomain network[20483]: Bringing up loopback interface:  Could not load file '/etc/sysconfig/network-script...cfg-lo'
Dec 06 16:43:29 localhost.localdomain network[20483]: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Dec 06 16:43:30 localhost.localdomain network[20483]: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Dec 06 16:43:30 localhost.localdomain network[20483]: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Dec 06 16:43:30 localhost.localdomain network[20483]: [  OK  ]
Dec 06 16:43:30 localhost.localdomain network[20483]: Bringing up interface enp0s3:  Connection successfully activated (D-Bus active path...tion/3)
Dec 06 16:43:30 localhost.localdomain network[20483]: [  OK  ]
Dec 06 16:43:31 localhost.localdomain network[20483]: Bringing up interface enp0s8:  Connection successfully activated (D-Bus active path...tion/4)
Dec 06 16:43:31 localhost.localdomain network[20483]: [  OK  ]
Dec 06 16:43:32 localhost.localdomain systemd[1]: Started LSB: Bring up/down networking.
Hint: Some lines were ellipsized, use -l to show in full.

7. 测试能否正常联网

[root@localhost log]# ping www.baidu.com
PING www.a.shifen.com (115.239.210.27) 56(84) bytes of data.
64 bytes from 115.239.210.27: icmp_seq=1 ttl=54 time=26.3 ms
64 bytes from 115.239.210.27: icmp_seq=2 ttl=54 time=28.0 ms
64 bytes from 115.239.210.27: icmp_seq=3 ttl=54 time=26.5 ms
64 bytes from 115.239.210.27: icmp_seq=4 ttl=54 time=38.2 ms
64 bytes from 115.239.210.27: icmp_seq=5 ttl=54 time=26.9 ms
64 bytes from 115.239.210.27: icmp_seq=6 ttl=54 time=26.5 ms
^C64 bytes from 115.239.210.27: icmp_seq=7 ttl=54 time=27.4 ms

--- www.a.shifen.com ping statistics ---
7 packets transmitted, 7 received, 0% packet loss, time 6018ms
rtt min/avg/max/mdev = 26.371/28.599/38.262/3.981 ms

2、 修改yum源

网易YUM源下载地址：https://mirrors.163.com/.help/centos.html

按照网站说明依次执行【备份】、【下载】、【生成缓存】操作

3、安装SunJDK（可能需要卸载OpenJDK）

参考链接：https://www.jianshu.com/p/58f311bfe332

参考链接：https://www.cnblogs.com/muscleape/p/6385370.html

1. 如果需要卸载OpenJDK，请参照以上链接
2. 下载JDK文件，下载地址：https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
3. 安装jdk

## 默认的安装路径在 /usr/java/
[root@localhost ~]# rpm -ivh jdk-8u131-linux-x64.rpm

4. 验证是否安装成功

[root@localhost ~]# java -version
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)

5. 配置环境变量

## 打开环境变量配置文件
[root@localhost ~]# vi /etc/profile
## 添加一下jdk配置信息
# SunJDK 1.8
JAVA_HOME=/usr/java/jdk1.8.0_131
JRE_HOME=/usr/java/jdk1.8.0_131/jre
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
export JAVA_HOME JRE_HOME PATH CLASSPATH

6. 使配置文件起作用

[root@localhost ~]# source /etc/profile

7. 查看环境变量

## 其中已经包含jdk配置信息
[root@localhost ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/usr/java/jdk1.8.0.131/bin:/usr/java/jdk1.8.0.131/jre/bin:/usr/java/jdk1.8.0_131/bin:/usr/java/jdk1.8.0_131/jre/bin

4、安装Maven

1. 下载安装包，地址：https://maven.apache.org/download.cgi
2. 解压安装包，并放到指定目录中

[root@localhost ~]# tar xzvf apache-maven-3.6.0-bin.tar.gz
[root@localhost ~]# mv apache-maven-3.6.0/ /usr/apache-maven/ 

3. 创建配置文件，并添加配置信息

## 创建配置文件
[root@localhost ~]# cd /etc/profile.d/
[root@localhost profile.d]# vim maven.sh
## 添加以下配置信息
# Apache Maven Environment Variables
# MAVEN_HOME for Maven 1 - M2_HOME for Maven 2
export M2_HOME=/usr/apache-maven
export PATH=${M2_HOME}/bin:${PATH}

4. 修改配置文件权限，并使配置信息起作用

[root@localhost profile.d]# chmod +x maven.sh
[root@localhost profile.d]# ll
total 60
-rwxr-xr-x. 1 root root  152 Dec  6 15:28 maven.sh
[root@localhost profile.d]# source /etc/profile.d/maven.sh

5. 验证Maven安装情况

[root@localhost profile.d]# mvn --version
Apache Maven 3.6.0 (97c98ec64a1fdfee7767ce5ffb20918da4f719f3; 2018-10-25T02:41:47+08:00)
Maven home: /usr/apache-maven
Java version: 1.8.0_131, vendor: Oracle Corporation, runtime: /usr/java/jdk1.8.0_131/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.10.0-327.el7.x86_64", arch: "amd64", family: "unix"

5、安装MySQL（YUM方式安装）

MySQL官网的完整安装步骤，暂时还没有用到这么多，这里只是摘取部分功能安装

官方安装说明：https://dev.mysql.com/doc/mysql-yum-repo-quick-guide/en/

1. 下载MySQL的YUM Repository仓库文件（并不是安装文件），地址：https://dev.mysql.com/downloads/repo/yum/
2. 安装下载的仓库配置文件

[root@localhost files]# rpm -Uvh mysql80-community-release-el7-1.noarch.rpm

3. 仓库文件中包含多个可安装的程序，查看一下：

[root@localhost files]# yum repolist all | grep mysql
mysql-cluster-7.5-community/x86_64 MySQL Cluster 7.5 Community   disabled
mysql-cluster-7.5-community-source MySQL Cluster 7.5 Community - disabled
mysql-cluster-7.6-community/x86_64 MySQL Cluster 7.6 Community   disabled
mysql-cluster-7.6-community-source MySQL Cluster 7.6 Community - disabled
mysql-connectors-community/x86_64  MySQL Connectors Community    enabled:     74
mysql-connectors-community-source  MySQL Connectors Community -  disabled
mysql-tools-community/x86_64       MySQL Tools Community         enabled:     74
mysql-tools-community-source       MySQL Tools Community - Sourc disabled
mysql-tools-preview/x86_64         MySQL Tools Preview           disabled
mysql-tools-preview-source         MySQL Tools Preview - Source  disabled
mysql55-community/x86_64           MySQL 5.5 Community Server    disabled
mysql55-community-source           MySQL 5.5 Community Server -  disabled
mysql56-community/x86_64           MySQL 5.6 Community Server    disabled
mysql56-community-source           MySQL 5.6 Community Server -  disabled
mysql57-community/x86_64           MySQL 5.7 Community Server    disabled
mysql57-community-source           MySQL 5.7 Community Server -  disabled
mysql80-community/x86_64           MySQL 8.0 Community Server    enabled:     49
mysql80-community-source           MySQL 8.0 Community Server -  disabled
##
## 可以看到默认的可安装的版本是 mysql80(倒数第二行最后的属性值为enabled)

4. 查看安装信息文件

## 查找安装配置文件
[root@localhost files]# cd /etc/yum.repos.d/
[root@localhost yum.repos.d]# ll
total 40
-rw-r--r--. 1 root root 1864 Feb 22  2018 mysql-community.repo
-rw-r--r--. 1 root root 1885 Feb 22  2018 mysql-community-source.repo

5. 修改默认安装的版本，修改配置信息中特定版本的enabled属性值为1（只能有一个）

## 修改配置信息
[root@localhost yum.repos.d]# vim mysql-community.repo
## 例如修改5.7的版本为默认安装的版本
# Enable to use MySQL 5.7
[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

6. 确认安装版本变更为MySQL5.7

[root@localhost yum.repos.d]# yum repolist all | grep mysql
mysql-cluster-7.5-community/x86_64 MySQL Cluster 7.5 Community   disabled
mysql-cluster-7.5-community-source MySQL Cluster 7.5 Community - disabled
mysql-cluster-7.6-community/x86_64 MySQL Cluster 7.6 Community   disabled
mysql-cluster-7.6-community-source MySQL Cluster 7.6 Community - disabled
mysql-connectors-community/x86_64  MySQL Connectors Community    enabled:     74
mysql-connectors-community-source  MySQL Connectors Community -  disabled
mysql-tools-community/x86_64       MySQL Tools Community         enabled:     74
mysql-tools-community-source       MySQL Tools Community - Sourc disabled
mysql-tools-preview/x86_64         MySQL Tools Preview           disabled
mysql-tools-preview-source         MySQL Tools Preview - Source  disabled
mysql55-community/x86_64           MySQL 5.5 Community Server    disabled
mysql55-community-source           MySQL 5.5 Community Server -  disabled
mysql56-community/x86_64           MySQL 5.6 Community Server    disabled
mysql56-community-source           MySQL 5.6 Community Server -  disabled
mysql57-community/x86_64           MySQL 5.7 Community Server    enabled:    307
mysql57-community-source           MySQL 5.7 Community Server -  disabled
mysql80-community/x86_64           MySQL 8.0 Community Server    disabled
mysql80-community-source           MySQL 8.0 Community Server -  disabled

7. 安装server

[root@localhost yum.repos.d]# yum install mysql-community-server

8. 查看已安装MySQL

[root@localhost yum.repos.d]# rpm -qa | grep mysql
mysql80-community-release-el7-1.noarch
mysql-community-server-5.7.24-1.el7.x86_64
mysql-community-libs-5.7.24-1.el7.x86_64
mysql-community-libs-compat-5.7.24-1.el7.x86_64
mysql-community-common-5.7.24-1.el7.x86_64
mysql-community-client-5.7.24-1.el7.x86_64

9. 查看MySQL服务状态

[root@localhost yum.repos.d]# systemctl status mysqld
● mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: inactive (dead)
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
[root@localhost yum.repos.d]# systemctl start mysqld
[root@localhost yum.repos.d]# systemctl status mysqld
● mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: active (running) since Thu 2018-12-06 16:11:21 CST; 6s ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process: 20035 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
  Process: 19961 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
 Main PID: 20038 (mysqld)
   CGroup: /system.slice/mysqld.service
           └─20038 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

Dec 06 16:11:13 localhost.localdomain systemd[1]: Starting MySQL Server...
Dec 06 16:11:21 localhost.localdomain systemd[1]: Started MySQL Server.

10. 查看安装生成的默认密码

[root@localhost log]# grep "password" ./mysqld.log
2018-12-06T08:11:14.339301Z 1 [Note] A temporary password is generated for root@localhost: CQj-#jME0W2s

11. 登录数据库

[root@localhost log]# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.24

12. 修改root账户密码（密码格式默认需要满足一定的复杂度）

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';

13. 开放远程主机连接

mysql> use mysql;
mysql> select host,user from user;
+-----------+---------------+
| host      | user          |
+-----------+---------------+
| localhost | mysql.session |
| localhost | mysql.sys     |
| localhost | root          |
+-----------+---------------+
3 rows in set (0.00 sec)

mysql> update user set host = '%' where user ='root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select host,user from user;
+-----------+---------------+
| host      | user          |
+-----------+---------------+
| %         | root          |
| localhost | mysql.session |
| localhost | mysql.sys     |
+-----------+---------------+
3 rows in set (0.00 sec)

mysql> flush privileges;

mysql> exit
Bye

14. 防火墙开放3306端口

## 输出success则表示添加成功
[root@localhost ~]# firewall-cmd --zone=public --add-port=3306/tcp --permanent
success
## 重启防火墙
[root@localhost ~]# systemctl restart firewalld

15. 使用其他机器连接数据库，测试是否可连接