基于centOS7.5 x64/openjdk1.8/tomcat8.5/nginx1.16/nodejs/mysql8.0/redis3/git的服务器环境配置)_综合

基于centOS7.5 64/openjdk1.8/tomcat/nginx/nodejs/mysql5.7/git的服务器环境配置)

我以前的三年和未来的三年从事网站开发，主要手段是JAVA，python，nodejs，前端大套间，偶尔写写服务器脚本，做做自动化部署。记录这篇博客的目的在于记录服务器部署过程，很多次都要重新部署服务器，什么安装openjdk然后配https，做过就忘了，下次又重新开始，很烦恼。记下来吧，要配服务器的时候直接过来拔就是了*

第一步、更新yum仓库

//新安装的服务器更新一下yum的版本，这一步不是强制要求，详细参考update与upgrade的用法和作用
ruan$ yum -y update

第二步、先安装简单的东西

2.1 git

git官方网址：https://git-scm.com/download/linux, git官方的download页面推荐用法是直接使用yum安装git，因为版本对git的影响实则不大，一般来说，不需要下载源码自己编译或者去找新版本的仓库。

ruan$ yum install -y git
// 总下载量：4.5 M
// 安装大小：22 M

2.2 nginx

安装nginx,nginx的中文网站有关于自己编译源码安装的手段：
http://www.nginx.cn/install
不过源码编译很麻烦，在centOS中采用yum安装就可以了，对于作为普通的服务器来说，各个版本的nginx差异不大，使用yum安装默认版本nginx：

//总下载量：4.2 M
//安装大小：14 M
ruan$ yum -y install nginx

查看一下安装的版本：

ruan$ yum list nginx
已加载插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
已安装的软件包
nginx.x86_64                        1:1.16.1-1.el7                         @epel

启动nginx：

ruan$ systemctl start nginx.service

查看nginx服务的状态（以下是正常启动的状态）：

[root@VM_7_129_centos ~]# systemctl status nginx.service
● nginx.service - The nginx HTTP and reverse proxy serverLoaded: loaded (/usr/lib/systemd/system/nginx.service; disabled; vendor preset: disabled)Active: active (running) since 三 2019-12-18 13:42:14 CST; 1min 1s agoProcess: 29192 ExecStart=/usr/sbin/nginx (code=exited, status=0/SUCCESS)Process: 29190 ExecStartPre=/usr/sbin/nginx -t (code=exited, status=0/SUCCESS)Process: 29188 ExecStartPre=/usr/bin/rm -f /run/nginx.pid (code=exited, status=0/SUCCESS)Main PID: 29194 (nginx)CGroup: /system.slice/nginx.service├─29194 nginx: master process /usr/sbin/nginx└─29195 nginx: worker process12月 18 13:42:14 VM_7_129_centos systemd[1]: Starting The nginx HTTP and re....
12月 18 13:42:14 VM_7_129_centos nginx[29190]: nginx: the configuration fil...k
12月 18 13:42:14 VM_7_129_centos nginx[29190]: nginx: configuration file /e...l
12月 18 13:42:14 VM_7_129_centos systemd[1]: Failed to parse PID from file ...t
12月 18 13:42:14 VM_7_129_centos systemd[1]: Started The nginx HTTP and rev....
Hint: Some lines were ellipsized, use -l to show in full.

关闭nginx

ruan$ systemctl stop nginx.service

设置开机自动启动服务

ruan$ systemctl enable nginx.service

简单配置

首先切换到== /etc/nginx ==下，这是nginx配置的根目录，以后配置https,pem等文件就要丢在这个位置。：

conf.d                  koi-utf             scgi_params
default.d               koi-win             scgi_params.default
fastcgi.conf            mime.types          uwsgi_params
fastcgi.conf.default    mime.types.default  uwsgi_params.default
fastcgi_params          nginx.conf          win-utf
fastcgi_params.default  nginx.conf.default
// 当前目录下有一个nginx.conf文件，这是nginx配置的根配置文件，其中有一句：
// include /etc/nginx/conf.d/*.conf;
// 这一句说明conf.d目录下的**.conf都会被加载成为配置文件,所以我们的配置文件自己书写，然后保存
// 在conf.d下面就行了

其中nginx.conf：

# For more information on configuration, see:
#   * Official English Documentation: http://nginx.org/en/docs/
#   * Official Russian Documentation: http://nginx.org/ru/docs/user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;events {worker_connections 1024;
}http {log_format  main  '$remote_addr - $remote_user [$time_local] "$request" ''$status $body_bytes_sent "$http_referer" ''"$http_user_agent" "$http_x_forwarded_for"';access_log  /var/log/nginx/access.log  main;sendfile            on;tcp_nopush          on;tcp_nodelay         on;keepalive_timeout   65;types_hash_max_size 2048;include             /etc/nginx/mime.types;default_type        application/octet-stream;# Load modular configuration files from the /etc/nginx/conf.d directory.# See http://nginx.org/en/docs/ngx_core_module.html#include# for more information.include /etc/nginx/conf.d/*.conf;server {listen       80 default_server;listen       [::]:80 default_server;server_name  _;root         /usr/share/nginx/html;# Load configuration files for the default server block.include /etc/nginx/default.d/*.conf;location / {}error_page 404 /404.html;location = /40x.html {}error_page 500 502 503 504 /50x.html;location = /50x.html {}}# Settings for a TLS enabled server.
#
#    server {
#        listen       443 ssl http2 default_server;
#        listen       [::]:443 ssl http2 default_server;
#        server_name  _;
#        root         /usr/share/nginx/html;
#
#        ssl_certificate "/etc/pki/nginx/server.crt";
#        ssl_certificate_key "/etc/pki/nginx/private/server.key";
#        ssl_session_cache shared:SSL:1m;
#        ssl_session_timeout  10m;
#        ssl_ciphers HIGH:!aNULL:!MD5;
#        ssl_prefer_server_ciphers on;
#
#        # Load configuration files for the default server block.
#        include /etc/nginx/default.d/*.conf;
#
#        location / {
#        }
#
#        error_page 404 /404.html;
#            location = /40x.html {
#        }
#
#        error_page 500 502 503 504 /50x.html;
#            location = /50x.html {
#        }
#    }}

切换到conf.d目录，新建my.conf，文件名随意
因为上面片段的include与server节点是同级的，所以我们在自己的配置文件中直接写server节点配置就可以了。如果默认的话，其实可以不用写配置文件，直接80端口就行了，修改其中server节点下的root指向的位置即可。默认指向：root /usr/share/nginx/html;

配置https(详情我是参照的腾讯云，请你们自己参考别的)
在你的my.conf中增加如下代码：

server {#SSL 访问端口号为 443listen 443; #填写绑定证书的域名server_name www.domain.com; #启用 SSL 功能ssl on;#证书文件名称ssl_certificate 1_www.domain.com_bundle.crt; #私钥文件名称ssl_certificate_key 2_www.domain.com.key; ssl_session_timeout 5m;#请按照以下协议配置ssl_protocols TLSv1 TLSv1.1 TLSv1.2; #请按照以下套件配置，配置加密套件，写法遵循 openssl 标准。ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:HIGH:!aNULL:!MD5:!RC4:!DHE; ssl_prefer_server_ciphers on;location / {#网站主页路径。此路径仅供参考，具体请您按照实际目录操作。root /var/www/www.domain.com; index  index.html index.htm;}}

其中server_name填写域名,比如www.ruankun.xyz
ssl_certificate 1_www.domain.com_bundle.crt;填写你的文件名
ssl_certificate_key 2_www.domain.com.key; 一样填写你的文件名
location节点看情况部署

测试配置文件是否正确

ruan$ nginx -t
//正确的输出
nginx: [warn] the "ssl" directive is deprecated, use the "listen ... ssl" directive instead in /etc/nginx/conf.d/my.conf:7
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

配置http跳转https
http跳转https的方案有很多种：
1. 页面中添加 JS 脚本
2. 后端程序中添加重定向
3. 通过 Web 服务器实现跳转
4. rewrite 功能
在这个地方，我们通过rewrite来实现http跳转https.在my.conf中继续加入如下代码：
注意更改其中的server_name节点。

server {listen 80;#填写绑定证书的域名server_name www.ruankun.xyz;#把http的域名请求转成httpsrewrite ^(.*)$ https://$host$1 permanent;
}

第三步、安装MySQL8.0

3.1 更新rpm包

安装mysql8.0, 默认的yum里面就是mariaDB, 不晓得用不用得，所以要重新下载rpm, 官方rpm下载地址：
https://dev.mysql.com/downloads/repo/yum/
redhat和centOS源出同门，选red hat版本的就行了。
rpm下载地址(red hat 7)：https://repo.mysql.com//mysql80-community-release-el7-3.noarch.rpm

下载rpm包：

ruan$ wget https://repo.mysql.com//mysql80-community-release-el7-3.noarch.rpm

安装rpm包到yum仓库(-ivh: i install安装, v verbose打印全日志, h hash安装进度)

ruan$ rpm -ivh mysql80-community-release-el7-3.noarch.rpm
警告：mysql80-community-release-el7-3.noarch.rpm: 头V3 DSA/SHA1 Signature, 密钥 ID 5072e1f5: NOKEY准备中...                          ################################# [100%]正在升级/安装...1:mysql80-community-release-el7-3  ################################# [100%]

查看是否可以安装:

ruan$ yum repolist all | grep mysql

输出如下：

mysql-cluster-7.5-community/x86_64 MySQL Cluster 7.5 Community      禁用
mysql-cluster-7.5-community-source MySQL Cluster 7.5 Community - So 禁用
mysql-cluster-7.6-community/x86_64 MySQL Cluster 7.6 Community      禁用
mysql-cluster-7.6-community-source MySQL Cluster 7.6 Community - So 禁用
mysql-cluster-8.0-community/x86_64 MySQL Cluster 8.0 Community      禁用
mysql-cluster-8.0-community-source MySQL Cluster 8.0 Community - So 禁用
mysql-connectors-community/x86_64  MySQL Connectors Community       启用:    131
mysql-connectors-community-source  MySQL Connectors Community - Sou 禁用
mysql-tools-community/x86_64       MySQL Tools Community            启用:    100
mysql-tools-community-source       MySQL Tools Community - Source   禁用
mysql-tools-preview/x86_64         MySQL Tools Preview              禁用
mysql-tools-preview-source         MySQL Tools Preview - Source     禁用
mysql55-community/x86_64           MySQL 5.5 Community Server       禁用
mysql55-community-source           MySQL 5.5 Community Server - Sou 禁用
mysql56-community/x86_64           MySQL 5.6 Community Server       禁用
mysql56-community-source           MySQL 5.6 Community Server - Sou 禁用
mysql57-community/x86_64           MySQL 5.7 Community Server       禁用
mysql57-community-source           MySQL 5.7 Community Server - Sou 禁用
mysql80-community/x86_64           MySQL 8.0 Community Server       启用:    145
mysql80-community-source           MySQL 8.0 Community Server - Sou 禁用

看到 mysql80-community/x86_64 MySQL 8.0 Community Server 启用: 145, 可以开始安装了

3.2 安装mysql：

安装

ruan$ yum install -y mysql-community-server
安装  3 软件包 (+3 依赖软件包)总下载量：473 M

这样就会自动开始安装mysql了。

启动服务

ruan$ systemctl start mysqld.service

查看服务状态以及开机启动

ruan$ systemctl status mysqld.service
ruan$ systemctl stop mysqld.service
ruan$ systemctl enable mysqld.service

初次连接mysql
第一次安装的mysql密码在/var/log/mysqld.log中：

ruan$ cat mysqld.log
2019-12-18T10:29:01.406509Z 0 [System] [MY-013169] [Server] /usr/sbin/mysqld (mysqld 8.0.18) initializing of server in progress as process 6124
2019-12-18T10:29:07.688866Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: HowQel2iu3+a
2019-12-18T10:29:13.492460Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.18) starting as process 6227
2019-12-18T10:29:14.866511Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2019-12-18T10:29:14.915740Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.18'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MySQL Community Server - GPL.

其中密码是： HowQel2iu3+a
连接mysql并修改密码，修改密码的语句：

ruan$ ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '1234';

紧接着需要设置root的远程访问：

mysql>  use mysql
mysql> update user set host='%' where user='root';
mysql> flush privileges;

卸载mySQL

为什么要卸载？原因很多，例如官方声明：mysql8不支持在my.conf中设置lower_case_table_names变量，只能在初始化时指定该变量，如果你没有，那么默认你的mysql就不会忽略大小写敏感问题，导致你大小写出现很多问题。
卸载mysql：

ruan$ systemctl stop mysqld.service
ruan$ rpm -qa|grep -i mysql
//找到mysql的包后，挨着卸载，如果出现依赖错误就先卸载依赖的。
ruan$ rpm -ev mysql-community-client-8.0.11-1.el7.x86_64 --nodeps
...

删除相关目录：

ruan$ find / -name mysql
/var/lib/mysql/mysql
/etc/selinux/targeted/active/modules/100/mysql
/root/.gradle/caches/modules-2/files-2.1/mysql
/root/.gradle/caches/modules-2/metadata-2.82/descriptors/mysql
ruan$ rm -rf /var/lib/mysql/
ruan$ rm -rf /var/lib/mysql/mysql
ruan$ rm -rf /etc/selinux/targeted/active/modules/100/mysql

卸载到此完成。

第四步、安装openjdk1.8

yum默认安装的java只有jre，没有jdk，所以安装时需要小心。

4.1找open jdk 1.8

ruan$ yum search java-1.8.0|grep openjdk

as is shown：

java-1.8.0-openjdk.i686 : OpenJDK Runtime Environment 8
java-1.8.0-openjdk.x86_64 : OpenJDK Runtime Environment 8
java-1.8.0-openjdk-accessibility.i686 : OpenJDK accessibility connector
java-1.8.0-openjdk-accessibility.x86_64 : OpenJDK accessibility connector
java-1.8.0-openjdk-accessibility-debug.i686 : OpenJDK 8 accessibility connector
java-1.8.0-openjdk-accessibility-debug.x86_64 : OpenJDK 8 accessibility
java-1.8.0-openjdk-debug.i686 : OpenJDK Runtime Environment 8 with full debug on
java-1.8.0-openjdk-debug.x86_64 : OpenJDK Runtime Environment 8 with full debug
java-1.8.0-openjdk-demo.i686 : OpenJDK Demos 8
java-1.8.0-openjdk-demo.x86_64 : OpenJDK Demos 8
java-1.8.0-openjdk-demo-debug.i686 : OpenJDK Demos 8 with full debug on
java-1.8.0-openjdk-demo-debug.x86_64 : OpenJDK Demos 8 with full debug on
java-1.8.0-openjdk-devel.i686 : OpenJDK Development Environment 8
java-1.8.0-openjdk-devel.x86_64 : OpenJDK Development Environment 8
java-1.8.0-openjdk-devel-debug.i686 : OpenJDK Development Environment 8 with
java-1.8.0-openjdk-devel-debug.x86_64 : OpenJDK Development Environment 8 with
java-1.8.0-openjdk-headless.i686 : OpenJDK Headless Runtime Environment 8
java-1.8.0-openjdk-headless.x86_64 : OpenJDK Headless Runtime Environment 8
java-1.8.0-openjdk-headless-debug.i686 : OpenJDK Runtime Environment with full
java-1.8.0-openjdk-headless-debug.x86_64 : OpenJDK Runtime Environment with full
java-1.8.0-openjdk-javadoc.noarch : OpenJDK 8 API documentation
java-1.8.0-openjdk-javadoc-debug.noarch : OpenJDK 8 API documentation for
java-1.8.0-openjdk-javadoc-zip.noarch : OpenJDK 8 API documentation compressed
java-1.8.0-openjdk-javadoc-zip-debug.noarch : OpenJDK 8 API documentation
java-1.8.0-openjdk-src.i686 : OpenJDK Source Bundle 8
java-1.8.0-openjdk-src.x86_64 : OpenJDK Source Bundle 8
java-1.8.0-openjdk-src-debug.i686 : OpenJDK Source Bundle 8 for packages with
java-1.8.0-openjdk-src-debug.x86_64 : OpenJDK Source Bundle 8 for packages with

其中，java-1.8.0-openjdk-devel.i686这个是OpenJDK Development Environment 8
我们就是要安装这个：

ruan$ yum install -y java-1.8.0-openjdk-devel
...
完毕！

验证openJDK安装完毕

ruan$ java
...
ruan$ javac
...
ruan$ java -version
openjdk version "1.8.0_232"
OpenJDK Runtime Environment (build 1.8.0_232-b09)
OpenJDK 64-Bit Server VM (build 25.232-b09, mixed mode)

第五步、an装redis

redis官网上有安装教程：https://redis.io/download

5.1 搜索yum中的redis并安装

yum仓库中的redis是3.x的版本，现在已经更新到5.x了，但我觉得3.x就够用了，好装稳定才是硬道理。

ruan$ yum list redis
已加载插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
可安装的软件包
redis.x86_64                          3.2.12-2.el7                          epel
ruan$ yum install -y redis
总下载量：648 k
安装大小：1.7 M

这redis也太小了，真的厉害。

5.2 启动redis、查看状态并设置开机启动

ruan$ systemctl start redis.service
ruan$ systemctl status redis.service
● redis.service - Redis persistent key-value databaseLoaded: loaded (/usr/lib/systemd/system/redis.service; disabled; vendor preset: disabled)Drop-In: /etc/systemd/system/redis.service.d└─limit.confActive: active (running) since 三 2019-12-18 23:46:17 CST; 6s agoMain PID: 22121 (redis-server)CGroup: /system.slice/redis.service└─22121 /usr/bin/redis-server 127.0.0.1:637912月 18 23:46:17 VM_7_129_centos systemd[1]: Starting Redis persistent key-....
12月 18 23:46:17 VM_7_129_centos systemd[1]: Started Redis persistent key-v....
Hint: Some lines were ellipsized, use -l to show in full.
ruan$ systemctl enable redis.service

5.3 连接redis并设置登录密码

ruan$ redis-cli
127.0.0.1:6379>
127.0.0.1:6379>config set requirepass [your password]

六、安装gradle

一般spring项目会采用maven或者gradle打包，我们常用gradle，所以需要安装gradle，gradle直接去网上下载就是了。

6.1 下载gradle并解压

ruan$ wget https://downloads.gradle-dn.com/distributions/gradle-6.0.1-bin.zip
ruan$ cp gradle-6.0.1-bin.zip /usr/local/gradle-6.0.1-bin.zip
ruan$ cd /usr/local
ruan local$  unzip gradle-6.0.1-bin.zip
...

6.2 配置环境变量

ruan$ vim /etc/profile

输入以下内容并保存

export GRADLE_HOME=/usr/local/gradle-6.0.1
export GRADLE_BASE=/usr/local/gradle-6.0.1
export PATH=$PATH:$GRADLE_HOME/bin

使环境变量配置生效

ruan$ source /etc/profile

测试gradle是否安装正确：

ruan$ gradle --version
Welcome to Gradle 6.0.1!Here are the highlights of this release:- Substantial improvements in dependency management, including- Publishing Gradle Module Metadata in addition to pom.xml- Advanced control of transitive versions- Support for optional features and dependencies- Rules to tweak published metadata- Support for Java 13- Faster incremental Java and Groovy compilation- New Zinc compiler for Scala- VS2019 support- Support for Gradle Enterprise plugin 3.0For more details see https://docs.gradle.org/6.0.1/release-notes.html------------------------------------------------------------
Gradle 6.0.1
------------------------------------------------------------Build time:   2019-11-18 20:25:01 UTC
Revision:     fad121066a68c4701acd362daf4287a7c309a0f5Kotlin:       1.3.50
Groovy:       2.5.8
Ant:          Apache Ant(TM) version 1.10.7 compiled on September 1 2019
JVM:          1.8.0_232 (Oracle Corporation 25.232-b09)
OS:           Linux 3.10.0-862.el7.x86_64 amd64

七、安装tomcat

使用某些垃圾软件，比如webbuilder(特别讨厌这玩意儿，但公司买了这软件, 必须要用)，所以需要tomcat环境的支撑。安装tomcat8.5.

7.1 获取tomcat并保存到local

ruan$ wget https://mirrors.tuna.tsinghua.edu.cn/apache/tomcat/tomcat-8/v8.5.50/bin/apache-tomcat-8.5.50.tar.gz
ruan$ cp apache-tomcat-8.5.50.tar.gz /usr/local/
ruan$ cd /usr/local
ruan local$ tar -xvzf apache-tomcat-8.5.50.tar.gz

7.2 把tomcat配置到环境变量

不想折腾tomcat加到服务了，所以直接把bin配置到环境变量算了，直接./startup.sh就可以启动tomcat了

ruan$ vim /etc/profile

在后面接着加上

export CATALINA_HOME=/usr/local/apache-tomcat-8.5.50
export CATALINA_BASE=/usr/local/apache-tomcat-8.5.50
export PATH=$PATH:$CATALINA_HOME/bin

退出保存，使环境变量生效：

source /etc/profile

7.3 启动tomcat(配置端口过于简单，略)

ruan$ ./startup.sh
Using CATALINA_BASE:   /usr/local/apache-tomcat-8.5.50
Using CATALINA_HOME:   /usr/local/apache-tomcat-8.5.50
Using CATALINA_TMPDIR: /usr/local/apache-tomcat-8.5.50/temp
Using JRE_HOME:        /usr
Using CLASSPATH:       /usr/local/apache-tomcat-8.5.50/bin/bootstrap.jar:/usr/local/apache-tomcat-8.5.50/bin/tomcat-juli.jar
Tomcat started.

八、安装nodejs环境

因为前端采用npm构建，所以不安装nodejs环境实在是受不了，安装nodejs环境。

8.1 下载并安装node环境

nodejs中文网站：http://nodejs.cn/download/，官网正好抽风，不好意思。

ruan$ wget https://cdn.npm.taobao.org/dist/node/v12.14.0/node-v12.14.0-linux-x64.tar.xz

因为是xz结尾的压缩文件，解压缩：

ruan$ mv node-v12.14.0-linux-x64.tar.xz /usr/local/
ruan$ xz -d node-v12.14.0-linux-x64.tar.xz
ruan$ tar -xf node-v12.14.0-linux-x64.tar

解压后配置基础环境变量：

vim /etc/profile

加上这句话

export PATH=$PATH:/usr/local/node-v12/bin

使环境变量生效

source /etc/profile

8.2 测试node是否安装正确

ruan$ node -v
v12.14.0
ruan$ npm -v
6.13.4

8.3 深入配置(非必须)

npm安装包使用命令e.g: npm install -g express, 如果不希望安装在默认目录，则需要配置npm包的安装路径, 通常配置在node里面。

新建文件夹(注意你的node目录名字跟我的不一样，不要全抄我的下面命令)

ruan$ cd /usr/local/node-v12
ruan$ mkdir node_global
ruan$ mkdir node_cache

给npm添加配置项：

ruan$ npm config set prefix="/usr/local/node-v12/node_global"
ruan$ npm config set cache="/usr/local/node-v12/node_cache"

配置最后的环境变量

ruan$ vim /etc/profile

输入如下信息(不太理解这个配置的是否完全正确，但可以用)：

export PATH=$PATH:/usr/local/node-v12/bin
export NODE_PATH=/usr/local/node-v12/node_global/node_modules
export PATH=$PATH:/usr/local/node-v12/node_global

使环境变量生效：

ruan$ source /etc/profile

安装express测试一下：

ruan$ npm install -g express
+ express@4.17.1
added 50 packages from 37 contributors in 32.143s

在以下目录找到express：

/usr/local/node-v12/node_global/lib/node_modules/express

使用一下：

ruan$ touch test.js
ruan$ vim test.js

键入如下内容：

require('express')
console.log('hello world');

保存退出，运行一下：

ruan$ node test.js
internal/modules/cjs/loader.js:800throw err;^Error: Cannot find module 'express'
Require stack:
- /root/testNode2/index.jsat Function.Module._resolveFilename (internal/modules/cjs/loader.js:797:15)at Function.Module._load (internal/modules/cjs/loader.js:690:27)at Module.require (internal/modules/cjs/loader.js:852:19)at require (internal/modules/cjs/helpers.js:74:18)at Object.<anonymous> (/root/testNode2/index.js:1:1)at Module._compile (internal/modules/cjs/loader.js:959:30)at Object.Module._extensions..js (internal/modules/cjs/loader.js:995:10)at Module.load (internal/modules/cjs/loader.js:815:32)at Function.Module._load (internal/modules/cjs/loader.js:727:14)at Function.Module.runMain (internal/modules/cjs/loader.js:1047:10) {code: 'MODULE_NOT_FOUND',requireStack: [ '/root/testNode2/index.js' ]
}

全局的是不能用了，环境变量没有配置好，不过我们都这样用，不存在问题：

ruan$ cd wxhouse
ruan$ npm init
ruan$ npm install express --save
ruan$ vim index.js

输入:

require('express')
console.log('hello world');

运行：

ruan$ node index.js
hello world

九、总结

总算写完了，以后配置服务器就来这儿扒，还有一部分没写完，在下一步中介绍怎么：

如何配置docker容器并将端口映射到外层，然后使用nginx访问不同的docker，实现负载均衡。
如何配置jenkins自动化部署，以后代码推送到git上再也不用手动build run了，妈妈再也不用担心改一百次BUG就要打开服务器一百次然后手动java -jar xxx.jar了，还要手动杀进程，写配置文件，run，重启容器，麻不麻烦啊？

基于centOS7.5 x64/openjdk1.8/tomcat8.5/nginx1.16/nodejs/mysql8.0/redis3/git的服务器环境配置)