项目部署问题汇总

Mac和Linux远程连接服务器异常修复（WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!）

一、今天在使用SSH，连接远程服务器的时候，刚开始是没问题的。
后来阿里云主机重装了一下系统后，再也连不上了。一直报一个错。

~ ⌚ 22:49:52
$ ssh root@47.98.233.15
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:8hgJ8jpcBr1tm6HS72FpXwMrjba8MQqlqYJQLPB/Qf4.
Please contact your system administrator.
Add correct host key in /Users/wangdong/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/wangdong/.ssh/known_hosts:26
ECDSA host key for 47.98.233.15 has changed and you have requested strict checking.
Host key verification failed.

二、解决方法，看错误日志中有一句

Add correct host key in /Users/wangdong/.ssh/known_hosts to get rid of this message.
三、以编辑器的方式进入这个文件

vi /Users/wangdong/.ssh/known_hosts
四、将红线框部分删除掉

五、再次进行远程连接

~ ⌚ 22:52:18
$ ssh root@47.98.233.15
The authenticity of host '47.98.233.15 (47.98.233.15)' can't be established.
ECDSA key fingerprint is SHA256:8hgJ8jpcBr1tm6HS72FpXwMrjba8MQqlqYJQLPB/Qf4.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '47.98.233.15' (ECDSA) to the list of known hosts.
root@47.98.233.15's password:
Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.4.0-105-generic x86_64)

* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage

Welcome to Alibaba Cloud Elastic Compute Service !

root@iZbp17cj14ulhfrlj02rkaZ:~#

问题就解决了，原因是因为才重装系统后，再次进行远程连接上，在输入yes后，本机会将远程机器的信息，写到/Users/wangdong/.ssh/known_hosts文件中，所以如果远程重装系统了，本机一定要先清理掉。
————————————————
版权声明：本文为CSDN博主「向小凯同学学习」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/wd2014610/article/details/79945424

=========

```js
upstream blog {
    server 127.0.0.1:8000;
}
proxy_cache_path /cache levels=1:2 keys_zone=cache:10m max_size=10g inactive=60m use_temp_path=off;
server {
    listen 80;
    server_name www.blog.xiaozhumaopao.com;
    #开启gzip压缩start
    gzip on;
    gzip_min_length 1k;
    gzip_buffers 4 16k;
    #gzip_http_version 1.0;
    gzip_comp_level 8;
    gzip_types text/plain application/javascript application/x-javascript text/css application/xml text/javascript application/x-httpd-php image/jpeg image/gif;
    gzip_vary off;
    gzip_disable "MSIE [1-6].";
    #开启gzip压缩end
    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forward-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_set_header X-Nginx-Proxy true;
        proxy_set_header   X-Forwarded-Host $server_name;

        proxy_pass http://blog;
        proxy_redirect off;

        #配置缓存start
        proxy_cache cache;
        proxy_cache_valid   200 304 12h;
        proxy_cache_valid   any 10m;
        add_header  Nginx-Cache "$upstream_cache_status";
        proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
        #配置缓存end
    }
}


```

 3.如果每次提交代码到服务器 都提示正在运行 pm2，还有关闭服务后，无法请求接口：

1 配置文件中：

"post-deploy" : "npm install && pm2 startOrRestart ecosystem.json --env production", //项目发布到服务器上执行的命令

 

2.增加 processes.json文件

{
    "apps": [
      {
        "name": "myblog",
        "cwd": "./",
        "script": "./bin/www",
        "log_date_format": "YYYY-MM-DD HH:mm Z",
        "error_file": "/var/log/node-app/node-app.stderr.log",
        "out_file": "log/node-app.stdout.log",
        "pid_file": "pids/node-geo-api.pid",
        "instances": 6,
        "min_uptime": "200s",
        "max_restarts": 10,
        "max_memory_restart": "1M",
        "cron_restart": "1 0 * * *",
        "watch": false,
        "merge_logs": true,
        "exec_interpreter": "node",
        "exec_mode": "fork",
        "autorestart": false,
        "vizion": false
      }
    ]
  }

如何解决出现 unable to resolve host 问题 . https://www.jianshu.com/p/a46795929d1e