自动重启或正确处理插座。linux中的io服务器异常

您可以使用Supervisor- http://supervisord.org

Supervisor是一个客户机/服务器系统,允许其用户监视和控制类UNIX操作系统上的多个进程。

安装后,为您的应用程序创建一个监控配置文件。

例如,在 /etc/supervisor/conf.d/myserver.conf -

[program:my-server]
    command=node /path/to/server.js
    numprocs=1
    autostart=true  
    autorestart=true
    startretries=99999
    environment=NODE_ENV=production  
    stderr_logfile=/var/log/my-server.err.log  
    stdout_logfile=/var/log/my-server.log  
    user=myuser  

编辑主管主配置文件- /etc/supervisor/supervisord.conf

[unix_http_server]
file=/var/run/supervisor.sock    ; (the path to the socket file)
chmod=0700                       ; socket file mode (default 0700)

[supervisord]
logfile=/var/log/supervisor/supervisord.log ; (main log file;default    ] $CWD/supervisord.log)
pidfile=/var/run/supervisord.pid            ; (supervisord pidfile;default supervisord.pid)
childlogdir=/var/log/supervisor             ; ('AUTO' child log dir, default $TEMP)

; the below section must remain in the config file for RPC
; (supervisorctl/web interface) to work, additional interfaces may be
; added by defining them in separate rpcinterface: sections
 [rpcinterface:supervisor]
supervisor.rpcinterface_factory =  supervisor.rpcinterface:make_main_rpcinterface

[supervisorctl]
serverurl=unix:///var/run//supervisor.sock ; use a unix:// URL  for a unix socket

; The [include] section can just contain the "files" setting.  This
; setting can list multiple files (separated by whitespace or
; newlines).  It can also contain wildcards.  The filenames are
; interpreted as relative to this file.  Included files *cannot*
; include files themselves.

[include]
files = /etc/supervisor/conf.d/*.conf

用法: /etc/init.d/supervisord {start|stop|restart|force-reload|status|force-stop}

有关更多信息/文档,请阅读 http://supervisord.org/

您可以使用 pm2 监控日志、自动重启等。例如:

sudo npm install -g pm2
pm2 start app.js --watch

更多关于 watch & restart .

为了让服务器重新连接,您可能需要使用一些程序(比如forever)来检查服务器的状态,并在服务器死机时重新启动它。然而,这并不能解决客户的问题。当服务器死机时,客户端还需要重新初始化与服务器的连接。让我向您展示一个如何让客户机连接回服务器的最小示例。

主要思想是,您将侦听来自客户端套接字的“关闭”事件,并在需要时重新启动连接。让我们使用OOP来更好地说明这一点。

function Connector(host, port)
{
  // Connection parameters
  this.host = host;
  this.port = port;

  this.socket = null;

  // Attempt to establish a connection with the server.
  this._connect();
}

Connector.prototype._connect = function()
{
  this.socket = net.connect(this.port, this.host);

  this.socket.on('connect', this._onConnect);
  this.socket.on('error', this._onError);
  this.socket.on('close', this._onClose);
  this.socket.on('data', this._onData);
}


Connector.prototype._onConnect = function()
{
  console.log('Incoming connection');
}

Connector.prototype._onError = function(err)
{
  console.error('Connection error: ' + err);
}

Connector.prototype._onClose = function(had_error)
{
  console.log('Reconnecting to server.');
  self._scheduleReconnection();
}


Connector.prototype._scheduleReconnection = function()
{
  self.socket.removeAllListeners();
  self.socket = null;

  // Try to connect to the server again after 2 seconds.
  setTimeout(self._connect.bind(self), 2000);
}

Connector.prototype._onData = function(data)
{
  console.log('Incoming data.')
}

使用Connector对象,您现在可以开始连接:

connection = new Connector(127.0.0.1, 8080)

你知道这个连接会不断地尝试与服务器保持连接。