【腾讯云】自己搭建的腾讯云服务器JavaEE环境

0.安装SSH登录

1、生成公钥对

ssh-keygen -t rsa -P ''

-P表示密码,-P ” 就表示空密码,也可以不用-P参数,这样就要三车回车,用-P就一次回车。
它在/home/chenlb下生成.ssh目录,.ssh下有id_rsa和id_rsa.pub。

 如果是windows下面的话是在:

69_1.png

2、把A机下的id_rsa.pub复制到服务器,

    用sftp复制或者scp复制均可以

3、****服务器把从复制的id_rsa.pub添加到当前用户目录的.ssh/authorzied_keys文件里。

[root@iz2ze46xi6pjjj69ailg9lz ~]# cat ./.ssh/id_rsa.pub >> .ssh/authorized_keys
[root@iz2ze46xi6pjjj69ailg9lz ~]#  chmod 600 .ssh/authorized_keys

1.安装JDK环境:

1.将JDk.tar.gz上传到linux服务器

2.解压jdkxxx.tar.gz

例如:

[root@VM_0_12_centos java]# pwd
/opt/java
[root@VM_0_12_centos java]# ls
jdk1.7.0_80  jdk-7u80-linux-x64.tar.gz

3.将JDK添加到环境变量中:参考(http://www.cnblogs.com/qlqwjy/p/8575700.html)

(1)我采用的是vi /etc/profile的方式修改的环境变量(最后四行加入如下代码:)

export JAVA_HOME=/opt/java/jdk1.7.0_80
export JRE_HOME="$JAVA_HOME"/jre
export CLASSPATH=.:"${JAVA_HOME}"/lib:"${JRE_HOME}"/lib
export PATH="${PATH}":${JAVA_HOME}/bin

注意:

  export命令用于将shell变量输出为环境变量,或者将shell函数输出为环境变量。

  linux与windows环境变量的分隔符不同,linux是:(冒号),而windows是;(分号)。

(2)使修改的变量立马生效:

source /etc/profile

  source命令通常用于重新执行刚修改的初始化文件,使之立即生效,而不必注销并重新登录。因为linux所有的操作都会变成文件的格式存在。

(3)测试环境变量:

root查看环境变量:

[root@VM_0_12_centos /]# pwd
/
[root@VM_0_12_centos /]# java -version
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)
[root@VM_0_12_centos /]# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/usr/local/mongodb-linux-x86_6
4-3.0.6/bin/:/root/bin:/opt/java/jdk1.7.0_80/bin

普通用户查看环境变量:

[qlq@VM_0_12_centos ~]$ pwd
/home/qlq
[qlq@VM_0_12_centos ~]$ java -version
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)
[qlq@VM_0_12_centos ~]$ echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/opt/java/jdk1.7.0_80/bin:/us
/local/mongodb-linux-x86_64-3.0.6/bin/:/root/bin
[qlq@VM_0_12_centos ~]$

(4)编写java文件运行:

[root@VM_0_12_centos java]# vi ./test.java
[root@VM_0_12_centos java]# cat ./test.java
public class test{
 public static void main(String []a){
    System.out.print("hello word!");
        }

}
[root@VM_0_12_centos java]# javac ./test.java
[root@VM_0_12_centos java]# java test
hello word!

2.安装Tomcat环境:

1.将tomcat上传到服务器

2.解压xxx.tar.gz

 tar -xzvf apache-tomcat-7.0.72.tar.gz

3.编辑环境变量: vi /etc/profile的方式修改的环境变量(最后一行行加入如下代码:)

export CATALINA_HOME=/opt/apache-tomcat/apache-tomcat-7.0.72
source /etc/profile

4.测试tomcat是否能正确启动:

(1)启动tomcat

[root@VM_0_12_centos bin]# ${CATALINA_HOME}/bin/startup.sh
Using CATALINA_BASE:   /opt/apache-tomcat/apache-tomcat-7.0.72
Using CATALINA_HOME:   /opt/apache-tomcat/apache-tomcat-7.0.72
Using CATALINA_TMPDIR: /opt/apache-tomcat/apache-tomcat-7.0.72/temp
Using JRE_HOME:        /opt/java/jdk1.7.0_80/jre
Using CLASSPATH:       /opt/apache-tomcat/apache-tomcat-7.0.72/bin/bootstrap.jar
:/opt/apache-tomcat/apache-tomcat-7.0.72/bin/tomcat-juli.jar
Tomcat started.

(2)开放8080端口,并用curl访问8080端口

[root@VM_0_12_centos ~]# iptables -I INPUT -p tcp --dport 8080 -j ACCEPT  #开启8080端口
[root@VM_0_12_centos ~]# service iptables save                 #永久保存(前提是安装iptables.service)
iptables: Saving firewall rules to /etc/sysconfig/iptables:[  OK  ]    
[root@VM_0_12_centos ~]# curl localhost:8080
<!DOCTYPE html>


<html lang="en">
    <head>
        <title>Apache Tomcat/7.0.72</title>
        <link href="favicon.ico" rel="icon" type="image/x-icon" />
        <link href="favicon.ico" rel="shortcut icon" type="image/x-icon" />
        <link href="tomcat.css" rel="stylesheet" type="text/css" />
    </head>

    <body>
        <div id="wrapper">
            <div id="navigation" class="curved container">
                <span id="nav-home"><a href="http://tomcat.apache.org/">Home</a>
</span>
                <span id="nav-hosts"><a href="/docs/">Documentation</a></span>
                <span id="nav-config"><a href="/docs/config/">Configuration</a><
/span>
                <span id="nav-examples"><a href="/examples/">Examples</a></span>
...............

5.编写脚本让tomcat开机启动:

(1)在/etc/rc.d/ini.d/目录下新建tomcat文件,内容如下:

#!/bin/bash
#chkconfig: 2345 80 90
#description:tomcat
#input(start stop status) to operate tomcat service
#start funciton(start tomcat service use /opt/apache-tomcat/apache-tomcat-7.0.72
/bin/start.sh)
export CATALINA_HOME=/opt/apache-tomcat/apache-tomcat-7.0.72
export JAVA_HOME=/opt/java/jdk1.7.0_80
export JRE_HOME="$JAVA_HOME"/jre
start(){
        /usr/bin/sh "${CATALINA_HOME}"/bin/startup.sh
        if [ "$?" != "0" ]
        then
                echo "service is not success start"
        else
                echo "service is success start!"
        fi
        exit 1
}
#stop function
stop(){
        /usr/bin/sh "${CATALINA_HOME}"/bin/shutdown.sh
        if [ "$?" != "0" ]
        then
                echo "service is not success stop"
        else
                echo "service is success stop!"
        fi
}
#status function
status(){
        /usr/bin/ps -le | /usr/bin/grep java >/dev/null 2> /dev/null
        if [ "$?" != "0" ]
        then
                echo "service is not start"
        else
                echo "service is running!"
        fi
}
#read input and dispose function
input=${1}
case ${input} in
start)
        start
        ;;
stop)
        stop
        ;;
status)
        status
        ;;
*)
        echo "please use {start to start tomcat,stop to stop tomcat,status to re
ad tomcat status!}"
esac

脚本解释:

  status:根据进程中是否有java相关进程,判断服务是否开启

  start:到tomcat安装目录下,执行startup.sh

  stop:到tomcat安装目录下,执行shutdown.sh

  (注意前三行是声明环境变量是必须的)

  

(2)赋予可运行权限:

[root@VM_0_12_centos init.d]# chmod +x tomcat
[root@VM_0_12_centos init.d]# ll | grep tomcat
-rwxr-xr-x 1 root root  1029 Apr  6 12:38 tomcat

(3)测试脚本:

[root@VM_0_12_centos init.d]# service tomcat start
Using CATALINA_BASE:   /opt/apache-tomcat/apache-tomcat-7.0.72
Using CATALINA_HOME:   /opt/apache-tomcat/apache-tomcat-7.0.72
Using CATALINA_TMPDIR: /opt/apache-tomcat/apache-tomcat-7.0.72/temp
Using JRE_HOME:        /opt/java/jdk1.7.0_80/jre
Using CLASSPATH:       /opt/apache-tomcat/apache-tomcat-7.0.72/bin/bootstrap.jar
:/opt/apache-tomcat/apache-tomcat-7.0.72/bin/tomcat-juli.jar
Tomcat started.
service is success start!
[root@VM_0_12_centos init.d]# service tomcat status
service is running!

(6)让tomcat服务开机启动,添加服务开机启动:(使用chkconfig –add 添加,参考:http://www.cnblogs.com/qlqwjy/p/7746184.html)

[root@VM_0_12_centos init.d]# chkconfig --list    #查看服务列表
netconsole      0:off   1:off   2:off   3:off   4:off   5:off   6:off
network         0:off   1:off   2:on    3:on    4:on    5:on    6:off
[root@VM_0_12_centos init.d]# chkconfig --add tomcat  #添加tomcat服务开机启动
[root@VM_0_12_centos init.d]# chkconfig --list
netconsole      0:off   1:off   2:off   3:off   4:off   5:off   6:off
network         0:off   1:off   2:on    3:on    4:on    5:on    6:off
tomcat          0:off   1:off   2:on    3:on    4:on    5:on    6:off


2345分别对应的运行级别是多用户(没有NFS服务),多用户,暂留,GUI启动

查看/etc/rc.d/rc2.d:

[root@VM_0_12_centos init.d]# cd /etc/rc.d/rc2.d/
[root@VM_0_12_centos rc2.d]# ls
K50netconsole  S10network  S80tomcat
[root@VM_0_12_centos rc2.d]#

5.将对服务器80端口的访问转发到8080端口:

[root@VM_0_12_centos /]# iptables -t nat -L -n -v  #查看地址表的规则
Chain PREROUTING (policy ACCEPT 477K packets, 16M bytes)
 pkts bytes target     prot opt in     out     source               destination


Chain INPUT (policy ACCEPT 477K packets, 16M bytes)
 pkts bytes target     prot opt in     out     source               destination


Chain OUTPUT (policy ACCEPT 458K packets, 31M bytes)
 pkts bytes target     prot opt in     out     source               destination


Chain POSTROUTING (policy ACCEPT 458K packets, 31M bytes)
 pkts bytes target     prot opt in     out     source               destination

    0     0 MASQUERADE  tcp  --  *      eth1    0.0.0.0/0            0.0.0.0/0
          tcp dpt:80
[root@VM_0_12_centos /]# iptables -t nat -I PREROUTING -p tcp --dport 80 -j RED  
IRECT --to-port 8080                    #将80端口转发到8080端口
[root@VM_0_12_centos /]# iptables-save          #使规则生效
# Generated by iptables-save v1.4.21 on Fri Apr  6 13:04:49 2018
*nat
:PREROUTING ACCEPT [10:344]
:INPUT ACCEPT [10:344]
:OUTPUT ACCEPT [10:675]
:POSTROUTING ACCEPT [10:675]
-A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080
-A POSTROUTING -o eth1 -p tcp -m tcp --dport 80 -j MASQUERADE
COMMIT
# Completed on Fri Apr  6 13:04:49 2018
# Generated by iptables-save v1.4.21 on Fri Apr  6 13:04:49 2018
*filter
:INPUT ACCEPT [52609:4410485]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [46156:6499780]
-A INPUT -p tcp -m tcp --dport 8080 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 8010 -j ACCEPT
COMMIT
# Completed on Fri Apr  6 13:04:49 2018
[root@VM_0_12_centos /]# iptables -t nat -L -n -v    #再次查看nat表规则
Chain PREROUTING (policy ACCEPT 13 packets, 428 bytes)
 pkts bytes target     prot opt in     out     source               destination

    0     0 REDIRECT   tcp  --  *      *       0.0.0.0/0            0.0.0.0/0
         tcp dpt:80 redir ports 8080

Chain INPUT (policy ACCEPT 13 packets, 428 bytes)
 pkts bytes target     prot opt in     out     source               destination


Chain OUTPUT (policy ACCEPT 12 packets, 810 bytes)
 pkts bytes target     prot opt in     out     source               destination


Chain POSTROUTING (policy ACCEPT 12 packets, 810 bytes)
 pkts bytes target     prot opt in     out     source               destination

    0     0 MASQUERADE  tcp  --  *      eth1    0.0.0.0/0            0.0.0.0/0
          tcp dpt:80

浏览器访问:

69_2.png

至此,tomcat搭建完成。

补充:

  后来我将tomcat默认端口改为80,所以取消了上面的80端口转发到8080并设置tomcat为80端口:

(1)取消80转发到8080;

[root@VM_0_12_centos /]# iptables -t nat -D PREROUTING 1

iptables命令选项输入顺序:

iptables -t 表名 <-A/I/D/R> 规则链名 [规则号] <-i/o 网卡名> -p 协议名 <-s 源IP/源子网> --sport 源端口 <-d 目标IP/目标子网> --dport 目标端口 -j 动作

(2)修改tomcat默认端口为80(前提是nginx与apachehttpd开机不会占用80端口)

修改tomcat安装目录下/conf/server.xml的71行

69_3.png

参考:http://www.cnblogs.com/qlqwjy/p/8649695.html

Tomcat附加配置:优化

1、编写tomcat安装目录下,tomcat-users.xml添加角色和用户,可以远程部署项目:

<role rolename="tomcat"/>
<role rolename="manager-gui"/>
<role rolename="manager-status"/>
<role rolename="manager-script"/>
<role rolename="manager-jmx"/>
<user username="tomcat" password="tomcat" roles="tomcat,manager-gui,manager-status,manager-script,manager-jmx"/>

2、增大JVM参数:

3.安装Mysql:

我的腾讯云是CentOS7,安装MySQL时,出现了以下的提示:

69_4.png

原因是:

  CentOS7带有MariaDB而不是mysql

解决方案

  如果必须要安装MySQL,首先必须添加mysql社区repo通过输入命令:sudo rpm -Uvh http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm,最后使用像安 装MySQL的常规方法一样安装mysql: yum install mysql mysql-server mysql-libs mysql-server

1.在线安装命令

  yum -y install mysql-server

2、启动mysql

[root@VM_0_12_centos ~]# ps -le | grep mysql
[root@VM_0_12_centos ~]# service mysqld start  #启动mysql
Redirecting to /bin/systemctl start  mysqld.service
[root@VM_0_12_centos ~]# ps -le | grep mysql
4 S    27  4204     1  0  80   0 - 28313 wait   ?        00:00:00 mysqld_safe
0 S    27  4371  4204  9  80   0 - 329148 poll_s ?       00:00:00 mysqld

启动命令也可以 /etc/rc.d/init.d/mysqld start

3.登录mysql并修改root密码:

mysql -uroot

use mysql;
mysql> update user set Password=PASSWORD("newword") where user='root';  #修改密码
Query OK, 4 rows affected (0.00 sec)
Rows matched: 4  Changed: 4  Warnings: 0

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

4.设置mysql服务开机自启动(我的是centos7,所以用systemctl)

[root@VM_0_12_centos ~]# systemctl enable mysqld.service  #设置mysql开机启动
Created symlink from /etc/systemd/system/mysql.service to /usr/lib/systemd/syste
m/mysqld.service.
Created symlink from /etc/systemd/system/multi-user.target.wants/mysqld.service
to /usr/lib/systemd/system/mysqld.service.
[root@VM_0_12_centos ~]# systemctl is-enabled mysqld.service  #查看mysql服务是否开机启动
enabled

  如果不是centos7,可以自己编写脚本使服务开机启动,类似于tomcat开机启动脚本。

5.开启3306端口允许远程登录:

[root@VM_0_12_centos ~]# iptables -I INPUT -p tcp --dport 3306 -j ACCEPT  #开启3306端口
[root@VM_0_12_centos ~]# service iptables save              #保存到/etc/sysconfig/iptables使其永久有效
iptables: Saving firewall rules to /etc/sysconfig/iptables:[  OK  ]
[root@VM_0_12_centos ~]# cat /etc/sysconfig/iptables          #查看/etc/sysprofile/iptables文件内容
# Generated by iptables-save v1.4.21 on Fri Apr  6 15:57:33 2018
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [19:3484]
-A INPUT -p tcp -m tcp --dport 3306 -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A INPUT -p tcp -m tcp --dport 8080 -j ACCEPT
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
# Completed on Fri Apr  6 15:57:33 2018

6.授权远程登录账户:

mysql> grant all on *.*to username@'%' identified by 'xxxxx';  #授权账户
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;                      #刷新权限
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;

接下来在腾讯云官网开启3306端口即可远程访问数据库。

7.修改mysql的配置文件设置mysql的编码以及每次最大传送数据量等全局配置:

(1)首先查看mysql的编码的关键字:

mysql> show variables like '%char%';
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | latin1                     |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | latin1                     |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)

(2)修改/etc/my.cnf在mysqld后面增加:

character_set_server=utf8  #设置编码
max_allowed_packet=50M    #最大传送数据量
wait_timeout=604800      #等待连接时长
interactive_timeout=604800   #交互时长
event_scheduler=on      #开启任务调度

(3)连接mysql查看全局配置:

mysql> show variables like '%char%';
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | utf8                       |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.01 sec)

mysql> show variables like '%schedul%';
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| event_scheduler | ON    |
+-----------------+-------+
1 row in set (0.00 sec)

  至此,mysql的配置完成。

4.安装webmin

1.将webmin包上传到服务器

2.解压安装

  传到服务器->tar -xzvf xx.tar.gz 解压 ->进入解压后目录 -> ./setup.sh安装

注意:安装的默认端口是10000,如果不写用户名的话用户名是admin,密码必须写。
安装完成可以在linux中用curl localhost:10000测试是否启动

  参考:http://www.cnblogs.com/qlqwjy/p/8669081.html

总结:

  在iptables中开启的端口至少需要3306,8080。而且需要安装的服务有iptables,mysqld。且需要使用 systemctl enable xxx.service设置服务开机启动。不要忘记在腾讯云官网安全组开启端口。

补充:今天自己的服务器在调大JVM之后tomcat启动一段时间会自动关闭

  查看原因是自己的服务器运行内存不足,所以系统自动杀死了tomcat进程导致服务关闭,查看系统日志如下:

[root@VM_0_12_centos bin]# cat /var/log/messages|grep memory
Oct 11 21:36:15 localhost mysql-systemd-start: 2018-10-11 21:36:15 12472 [Note] InnoDB: The InnoDB memory heap is disabled
Oct 11 21:36:21 localhost mysql-systemd-start: 2018-10-11 21:36:21 12504 [Note] InnoDB: The InnoDB memory heap is disabled
Jan 15 05:48:52 127 kernel: [<ffffffff8118b0c6>] out_of_memory+0x4b6/0x4f0
Jan 15 05:48:53 127 kernel: Out of memory: Kill process 25900 (mysqld) score 434 or sacrifice child
Jan 15 05:48:53 127 kernel: [<ffffffff8118b0c6>] out_of_memory+0x4b6/0x4f0
Jan 15 05:48:53 127 kernel: Out of memory: Kill process 25913 (mysqld) score 434 or sacrifice child
Feb 26 18:39:51 127 kernel: [<ffffffff8118b0c6>] out_of_memory+0x4b6/0x4f0
Feb 26 18:39:51 127 kernel: Out of memory: Kill process 32465 (java) score 415 or sacrifice child
Feb 27 00:43:56 127 kernel: [<ffffffff8118b0c6>] out_of_memory+0x4b6/0x4f0
Feb 27 00:43:56 127 kernel: Out of memory: Kill process 15026 (java) score 410 or sacrifice child

  解决办法就是适当再减小JVM内存。或者增大服务器内存。

补充:今天在部署另一台服务器的时候发现SSH断开linux中相应的命令也停止,解决办法用screen:

  Screen是一款由GNU计划开发的用于命令行终端切换的自由软件。用户可以通过该软件同时连接多个本地或远程的命令行会话,并在其间自由切换。GNU Screen可以看作是窗口管理器的命令行界面版本。它提供了统一的管理多个会话的界面和相应的功能。

  在Screen环境下,所有的会话都独立的运行,并拥有各自的编号、输入、输出和窗口缓存。用户可以通过快捷键在不同的窗口下切换,并可以自由的重定向各个窗口的输入和输出。

语法:

screen [-AmRvx -ls -wipe][-d <作业名称>][-h <行数>][-r <作业名称>][-s ][-S <作业名称>]


-A  将所有的视窗都调整为目前终端机的大小。

-d   <作业名称>  将指定的screen作业离线。

-h   <行数>  指定视窗的缓冲区行数。

-m  即使目前已在作业中的screen作业,仍强制建立新的screen作业。

-r   <作业名称>  恢复离线的screen作业。

-R  先试图恢复离线的作业。若找不到离线的作业,即建立新的screen作业。

-s  指定建立新视窗时,所要执行的shell。

-S   <作业名称>  指定screen作业的名称。

-v  显示版本信息。

-x  恢复之前离线的screen作业。

-ls或--list  显示目前所有的screen作业。

-wipe  检查目前所有的screen作业,并删除已经无法使用的screen作业。

(1)安装screen

yum  install screen   #安装

(2)创建会话

screen -S  java #创建会话,java是会话名称

(3)这时会你可以在会话中执行命令

(4)退出会话:

完全退出: 会话中执行 exit。就相当于杀死了当前会话进程,不会进行session保存;

保持会话并退出:先同时按Ctrl+A然后按D键

(5)查看现有的screen会话

[root@VM_0_4_centos ~]# screen -ls
There is a screen on:
        25170.java      (Detached)
1 Socket in /var/run/screen/S-root.

(6)恢复到指定会话:

screen -r java

(7)杀死一个离线的会话

screen -X -S java quit

当然可以通过指定PID杀死,如下:

screen -X -S 25170 quit

https://www.cnblogs.com/qlqwjy/category/1035596.html

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未经允许不得转载:Java研发军团 » 【腾讯云】自己搭建的腾讯云服务器JavaEE环境

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