blocks|key|14707|text|你可以使用http://pingdom.com/来检查你的应用程序；如果每分钟检查一次，heroku就不会让你的应用程序空闲，也不需要启动。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|14708|entityMap|0|LINK|mutability|MUTABLE|url|http://pingdom.com/^0|5|J|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You can use <a href="http://pingdom.com/" rel="noreferrer">http://pingdom.com/</a> to check your app; if done every minute or so, heroku won't idle your app and won't need to spin-up.

blocks|key|3705431|text|你可以安装免费的New+Relic+add-on。它有一个可用性监视功能，可以每分钟ping你的站点两次，从而防止dyno空闲。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3705432|或多或少与Jesse的解决方案相同，但可能更接近Heroku……并且有一些额外的好处(性能监控非常棒)。|3705433|​|3705434|📷|atomic|3705435|3705436|3705437|+注意：对于所有那些说它不工作的人:我答案中的重要部分是“可用性监视器”。仅仅安装插件是没有用的。您还需要使用heroku应用程序的URL设置可用性监控。|blockquote|style|BOLD|3705438|3705439|entityMap|0|LINK|mutability|MUTABLE|url|http://addons.heroku.com/newrelic|1|IMAGE|IMMUTABLE|imageUrl|https://i.stack.imgur.com/vw4OQ.png|imageAlt^0|8|G|0|0|0|0|0|1|1|0|0|0|1|3|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@$A|17|B|18|1|19]]|C|$]]|$1|D|3|E|5|6|7|1A|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|1B|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|1C|8|@]|9|@$A|1D|B|1E|1|1F]]|C|$]]|$1|K|3|G|5|6|7|1G|8|@]|9|@]|C|$]]|$1|L|3|-4|5|6|7|1H|8|@]|9|@]|C|$]]|$1|M|3|N|5|O|7|1I|8|@$A|1J|B|1K|P|Q]]|9|@]|C|$]]|$1|R|3|-4|5|6|7|1L|8|@]|9|@]|C|$]]|$1|S|3|-4|5|6|7|1M|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]|10|$5|11|W|12|C|$13|14|15|-4]]]]

You can install the free <a href="http://addons.heroku.com/newrelic">New Relic add-on</a>. It has an availability monitor feature that will ping your site twice per minute, thus preventing the dyno from idling.

More or less the same solution as Jesse but maybe more integrated to Heroku... And with a few perks (performance monitoring is just great).

<img src="https://i.stack.imgur.com/vw4OQ.png" alt="Availability monitoring">

<blockquote>
 Note: to all those saying it doesn't work: the important part in my answer is "availability monitor". Just installing the addon won't help. You also need to setup the availability monitoring with the URL of your heroku app. 
</blockquote>

blocks|key|3705499|text|在我看来，使用服务的“免费”层不应该为生产或面向客户的应用程序提供动力。虽然上面的解决方案对Dyno空闲有效，但请仔细考虑您正在做的事情。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3705500|如果没有其他问题，可以使用cron+job来ping您的站点，并禁用对已知的低使用期(例如，夜间)的检查，以确保Heroku不会取消其他所有人的自由层。|3705501|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

In my opinion, using the 'free' tier of the service should not be powering a production or customer facing application. While the above solutions work against the Dyno idling, think thoroughly about what you're doing.

If nothing else, use a cron job to ping your site, and disable the check for known low-use periods (ie, overnight) to ensure Heroku doesn't do away with the free tier for everyone else.

blocks|key|3705574|text|它在Heroku文档中说，拥有超过1个web+dyno永远不会空闲。可能是一个比皮埃尔建议的0.09美元/小时更便宜的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3705575|​|3705576|📷|atomic|offset|length|3705577|3705578|Documentation|3705579|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://i.stack.imgur.com/28c9b.jpg|imageAlt|1|LINK|MUTABLE|url|https://devcenter.heroku.com/articles/dynos^0|0|0|0|1|0|0|0|0|D|1|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@$G|12|H|13|1|14]]|A|$]]|$1|I|3|C|5|6|7|15|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|16|8|@]|9|@$G|17|H|18|1|19]]|A|$]]|$1|L|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S|T|-4]]|U|$5|V|P|W|A|$X|Y]]]]

It says in Heroku documentation that having more than 1 web dyno will never idle out. Possibly a cheaper solution than $0.09/hour like Pierre suggests.

<img src="https://i.stack.imgur.com/28c9b.jpg" alt="enter image description here">

<a href="https://devcenter.heroku.com/articles/dynos" rel="noreferrer">Documentation</a>

blocks|key|1634927|text|作为Pingdom的替代品，我建议尝试使用Uptimerobot。它是免费的，并提供5分钟间隔的现场检查。它对我来说非常好用。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1634928|2015年5月7日的更新：这将不再可能，因为Heroku+will+change+their+free+dyno将阻止它保持完整的24小时：|style|BOLD|1634929|1634930|的另一个重要变化与动态睡眠或“空闲”有关。虽然非付费应用程序总是在活动超时后睡眠，但一些应用程序使用自动pinging服务来防止这种行为。免费的dynos允许每24小时唤醒18小时，在接下来的几周里，我们将开始通知用户超过这个限制的应用程序。随着业余爱好dyno+(每月7美元)的推出，我们要求要么让你的应用程序在超时后睡眠，要么升级到这个新选项。|blockquote|1634931|1634932|1634933|什么时候上线？根据他们的博客文章：|1634934|运行单个1X+dyno且不积累任何其他dyno费用的|1634935|应用程序将从7月1日开始逐步迁移到新的免费dyno。|1634936|1634937|entityMap|0|LINK|mutability|MUTABLE|url|http://uptimerobot.com/|1|https://blog.heroku.com/archives/2015/5/7/heroku-free-dynos^0|L|B|0|0|A|3|M|Y|1|0|0|0|0|0|0|0|6|4|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|D|3|E|5|6|7|18|8|@$A|19|B|1A|F|G]]|9|@$A|1B|B|1C|1|1D]]|C|$]]|$1|H|3|-4|5|6|7|1E|8|@]|9|@]|C|$]]|$1|I|3|J|5|K|7|1F|8|@]|9|@]|C|$]]|$1|L|3|-4|5|6|7|1G|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|1H|8|@]|9|@]|C|$]]|$1|N|3|O|5|6|7|1I|8|@]|9|@]|C|$]]|$1|P|3|Q|5|6|7|1J|8|@]|9|@]|C|$]]|$1|R|3|S|5|K|7|1K|8|@$A|1L|B|1M|F|G]]|9|@]|C|$]]|$1|T|3|-4|5|6|7|1N|8|@]|9|@]|C|$]]|$1|U|3|-4|5|6|7|1O|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]|12|$5|X|Y|Z|C|$10|13]]]]

As an alternative to Pingdom I suggest trying <a href="http://uptimerobot.com/">Uptimerobot</a>. It is free and offers 5 min interval site checking. It works very fine for me.

UPDATE 7th of May 2015: This will not be possible any more, as <a href="https://blog.heroku.com/archives/2015/5/7/heroku-free-dynos">Heroku will change their free dyno</a> to prevent keeping it alive for full 24 hours:

<blockquote>
 Another important change has to do with dyno sleeping, or ‘idling’. While non-paid apps have always slept after an activity timeout, some apps used automatic pinging services to prevent that behavior. free dynos are allowed 18 hours awake per 24 hour period, and over the next few weeks we will begin to notify users of apps that exceed that limit. With the introduction of the hobby dyno ($7 per month), we are asking to either let your app sleep after time out, or upgrade to this new option.
</blockquote>

When is this going to be live? According to their blog post:

<blockquote>
 Applications running a single 1X dyno that don’t accumulate any other
 dyno charges will be migrated gradually to the new free dynos
 beginning on July 1.
</blockquote>

blocks|key|14940|text|我已经写下了步骤：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|14941|将gem+'newrelic_rpm‘添加到您的Gemfile中的staging+&+production下|14942|➜捆绑包安装|14943|➜登录到heroku控制面板并添加新的Login插件|14944|添加➜后，设置自动pinging到您的网站，这样它就不会空闲|14945|➜浏览到菜单>可用性监视(在设置下)→单击“打开可用性监视”|14946|输入要ping的url+(例如：http://spokenvote.org)➜|offset|length|14947|➜为时间间隔选择1分钟|14948|entityMap|0|LINK|mutability|MUTABLE|url|http://spokenvote.org/^0|0|0|0|0|0|0|G|L|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|12|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|13|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|14|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|15|8|@]|9|@$N|16|O|17|1|18]]|A|$]]|$1|P|3|Q|5|6|7|19|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y]]]]

I have written down the steps:

➜ Add gem 'newrelic_rpm' to your Gemfile under staging &amp; production 
➜ bundle install 
➜ Login to heroku control panel and add newrelic addon 
➜ Once added, setup automatic pinging to your website so that it does not idle 
➜ Browse to Menu > Availability Monitoring (under Settings)
→ Click “Turn on Availability Monitoring” 
➜ Enter the url to ping (eg: <a href="http://spokenvote.org" rel="noreferrer">http://spokenvote.org</a>) 
➜ Select 1 minute for the interval

blocks|key|1634972|text|在2013年6月28日上使用Node.js+0.10.x在我自己的Heroku应用程序上进行了测试和工作|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1634973|var+http+=+require('http');+//importing+http

function+startKeepAlive()+{
++++setInterval(function()+{
++++++++var+options+=+{
++++++++++++host:+'your_app_name.herokuapp.com',
++++++++++++port:+80,
++++++++++++path:+'/'
++++++++};
++++++++http.get(options,+function(res)+{
++++++++++++res.on('data',+function(chunk)+{
++++++++++++++++try+{
++++++++++++++++++++//+optional+logging...+disable+after+it's+working
++++++++++++++++++++console.log("HEROKU+RESPONSE:+"+%2B+chunk);
++++++++++++++++}+catch+(err)+{
++++++++++++++++++++console.log(err.message);
++++++++++++++++}
++++++++++++});
++++++++}).on('error',+function(err)+{
++++++++++++console.log("Error:+"+%2B+err.message);
++++++++});
++++},+20+*+60+*+1000);+//+load+every+20+minutes
}

startKeepAlive();|code-block|syntax|javascript|1634974|entityMap^0|0|B|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Tested and working on my own Heroku app using Node.js 0.10.x on 6/28/2013

<pre><code>var http = require('http'); //importing http

function startKeepAlive() {
 setInterval(function() {
 var options = {
 host: 'your_app_name.herokuapp.com',
 port: 80,
 path: '/'
 };
 http.get(options, function(res) {
 res.on('data', function(chunk) {
 try {
 // optional logging... disable after it's working
 console.log("HEROKU RESPONSE: " + chunk);
 } catch (err) {
 console.log(err.message);
 }
 });
 }).on('error', function(err) {
 console.log("Error: " + err.message);
 });
 }, 20 * 60 * 1000); // load every 20 minutes
}

startKeepAlive();
</code></pre>

blocks|key|3705829|text|答案很简单--如果你看重这项服务，那就付钱。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3705830|为了获得付费service...well的好处，所有这些“诀窍”本质上就像是偷了有线电视。甚至在这里列出它们都是有问题的。下一步是什么，关于如何盗版游戏的技巧？|3705831|就像这里的另一个帖子一样，我重视用于开发和测试的免费服务，如果Heroku因为有太多免费的人而取消它，我会对你们这些道德受损的人感到非常恼火。我只是觉得他的批评不够直接。|3705832|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Easy answer--if you value the service then pay for it. 

All these 'tricks' to get the benefits of paid service...well it's essentially like stealing cable. Questionable to even list them here. What's next, tricks on how to pirate games?

Like another poster here, I value the free service for development and testing and I will be greatly annoyed at all you ethics-impaired types if Heroku does away with it because there are too many freeloaders. I just don't think he was direct enough in his criticism.

blocks|key|1635036|text|我找到了另一个免费的网站，它可以经常ping你的网站Unidler|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1635037|http://unidler.herokuapp.com/|offset|length|1635038|与pingdom相同，但不需要登录。|1635039|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|T|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@$D|Q|E|R|1|S]]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|C]]]]

I found another free site that will constantly ping your site called Unidler

<a href="http://unidler.herokuapp.com/" rel="noreferrer">http://unidler.herokuapp.com/</a>

Same as pingdom, but doesnt need to log in.

blocks|key|3705894|text|你也可以试试http://kaffeine.herokuapp.com+(我做的)，它是用来防止Heroku应用程序进入睡眠状态的。它将每10分钟ping一次你的应用程序，这样你的应用程序就不会进入睡眠状态。这是完全免费的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3705895|entityMap|0|LINK|mutability|MUTABLE|url|http://kaffeine.herokuapp.com/^0|6|T|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You can also try <a href="http://kaffeine.herokuapp.com" rel="noreferrer">http://kaffeine.herokuapp.com</a> (made by me), it's made for preventing Heroku apps to go to sleep. It will ping your app every 10 minutes so your app won't go to sleep. It's completely free.

blocks|key|15123|text|这对我在spring应用程序中工作，每2分钟向根url路径发出一个http请求。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|15124|import+org.slf4j.Logger;
import+org.slf4j.LoggerFactory;
import+org.springframework.scheduling.annotation.Scheduled;
import+org.springframework.web.client.RestTemplate;

public+class+HerokuNotIdle+{

private+static+final+Logger+LOG+=+LoggerFactory.getLogger(HerokuNotIdle.class);

@Scheduled(fixedDelay=120000)
public+void+herokuNotIdle(){
++++LOG.debug("Heroku+not+idle+execution");
++++RestTemplate+restTemplate+=+new+RestTemplate();
++++restTemplate.getForObject("http://yourapp.herokuapp.com/",+Object.class);
}
}|code-block|syntax|javascript|15125|请记住，配置上下文以启用调度程序并为调度程序创建bean|15126|@EnableScheduling
public+class+AppConfig+{

@Bean
public+HerokuNotIdle+herokuNotIdle(){
++++return+new+HerokuNotIdle();
}
}|15127|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

this work for me in a spring application making one http request every 2 minute to the root url path
`

<pre><code>import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.web.client.RestTemplate;

public class HerokuNotIdle {

private static final Logger LOG = LoggerFactory.getLogger(HerokuNotIdle.class);

@Scheduled(fixedDelay=120000)
public void herokuNotIdle(){
 LOG.debug("Heroku not idle execution");
 RestTemplate restTemplate = new RestTemplate();
 restTemplate.getForObject("http://yourapp.herokuapp.com/", Object.class);
}
}
</code></pre>

Remember config your context to enable scheduler and create the bean for your scheduler

<pre><code>@EnableScheduling
public class AppConfig {

@Bean
public HerokuNotIdle herokuNotIdle(){
 return new HerokuNotIdle();
}
}
</code></pre>

blocks|key|3705973|text|盖伊，这是一个heroku应用程序，你可以运行它来保持多个heroku应用程序的活力。只需在config.json中添加您想要ping的urls。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3705974|https://github.com/jcarras/rise-and-shine|offset|length|3705975|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|15|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

Guy, here is a heroku app you can run to keep multiple heroku apps alive. Just add the urls you want to ping in the config.json.

<a href="https://github.com/jcarras/rise-and-shine" rel="nofollow">https://github.com/jcarras/rise-and-shine</a>

blocks|key|2167873|text|我有一个应用程序，只需要在午餐时间从周一到周五运行。我只是在工作时将以下脚本添加到crontab中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2167874|#!/bin/sh
#+script+to+unidle+heroku+installation+for+the+use+with+cronjob
#+usage+in+crontab:
#+*/5+11-15+*+*+1-5+/usr/local/bin/uptimer.sh+http://www.example.com
#+The+command+/usr/local/bin/uptimer.sh+http://www.example.com+will+execute+every+5th+minute+of+11am+through+3pm+Mondays+through+Fridays+in+every+month.
#+resources:+http://www.cronchecker.net
echo+url+to+unidle:+$1
echo+[UPTIMER]:+waking+up+at:
date
curl+$1
echo+[UPTIMER]:+awake+at:
date|code-block|syntax|javascript|2167875|因此，对于任何应用程序，只需在您的crontab中添加另一行代码，如：|2167876|*/5+11-15+*+*+1-5+/usr/local/bin/uptimer.sh+http://www.example.com|2167877|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I have an app that only needs to run from monday to friday around lunchtime.
I just added the following script to the crontab at work:

<pre><code>#!/bin/sh
# script to unidle heroku installation for the use with cronjob
# usage in crontab:
# */5 11-15 * * 1-5 /usr/local/bin/uptimer.sh http://www.example.com
# The command /usr/local/bin/uptimer.sh http://www.example.com will execute every 5th minute of 11am through 3pm Mondays through Fridays in every month.
# resources: http://www.cronchecker.net
echo url to unidle: $1
echo [UPTIMER]: waking up at:
date
curl $1
echo [UPTIMER]: awake at:
date
</code></pre>

So for any app just drop another line in your crontab like:

<pre><code>*/5 11-15 * * 1-5 /usr/local/bin/uptimer.sh http://www.example.com
</code></pre>

blocks|key|1635508|text|请注意，新的dyno类型(currently+in+beta，2015年6月推出)将禁止保持免费的dyno唤醒24/7，因为它每天必须睡眠至少6小时。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1635509|所以，在这个帖子出来之前，试着删除你在这个帖子中找到的任何解决方案(或者为你实际使用的服务付费)。|1635510|entityMap|0|LINK|mutability|MUTABLE|url|https://blog.heroku.com/archives/2015/5/7/new-dyno-types-public-beta^0|D|H|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Note that the new dyno types (<a href="https://blog.heroku.com/archives/2015/5/7/new-dyno-types-public-beta" rel="nofollow">currently in beta</a>, incoming in June 2015) will forbid to keep a free dyno awoken 24/7, as it would have to sleep at least 6 hours per day.

So try to remove any solution you found in this thread before this comes out (or pay for the service you actually use).

blocks|key|1635550|text|如果您可以访问始终处于运行状态的unix服务器，您可以设置一个cron作业来GET您的网站。根据免费计划的新条款，您可能希望在夜间禁用GET，在crontab中使用如下行：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1635551|*/20+8-22+*+*+*+/usr/bin/curl+domain.com+&>+/dev/null|code-block|syntax|javascript|1635552|这将指示curl在8到22小时内每隔20分钟执行一次GET+domain.com。|1635553|请注意，|1635554|1635555|并不是每个想要查看你网站的人都住在你的时区，|ordered-list-item|1635556|你的网站可能会在半夜收到其他请求，唤醒你的dyno，并导致每个请求多花一个小时的使用时间。即使其他人不知道你的域，也有一些机器人和爬虫一直处于活动状态。因此，建议将crontab中定义的进程设置为仅活动14到16小时，以便为这些唤醒|1635557|提供缓冲|1635558|此外，请确保您的系统时间设置正确，以便在您期望的时候出现停机时间窗口。|1635559|entityMap^0|12|3|1V|3|0|0|4|4|Q|3|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|1B|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]|$1|P|3|Q|5|R|7|1D|8|@]|D|@]|E|$]]|$1|S|3|T|5|R|7|1E|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|1F|8|@]|D|@]|E|$]]|$1|W|3|X|5|6|7|1G|8|@]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|Z|$]]

If you have access to a unix server that's always up, you can set a cron job to <code>GET</code> your website. Under the new terms of the free plan, you'll probably want to disable the <code>GET</code>s in the night hours, using a line in your crontab like this:

<pre><code>*/20 8-22 * * * /usr/bin/curl domain.com &amp;&gt; /dev/null
</code></pre>

This instructs <code>curl</code> to <code>GET</code> domain.com every 20 minutes between the hours of 8 and 22.

Be aware that

<ol>
<li>Not everyone who wants to see your website lives in your timezone and</li>
<li>Your site may receive other requests in the middle of the night, waking up your dyno and causing another hour of usage time for each request. Even if no one else knows your domain, there are bots and crawlers that are active all the time. Therefore, it's advisable to set the process defined in your crontab to be active for only 14 to 16 hours to provide a buffer against these wake-ups</li>
</ol>

Also, make sure your system time is set up properly so that the down-time window happens when you expect it to.

blocks|key|2167931|text|我免费使用Heroku提供的Heroku+Scheduler插件。添加后，它很简单，创建一个作业与'curl+http://yourapp.herokuapp.com‘和10分钟的间隔。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2167932|entityMap|0|LINK|mutability|MUTABLE|url|http://yourapp.herokuapp.com/^0|1J|S|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I use the Heroku Scheduler addon provided by Heroku for free. Once added it is simple as creating a job with 'curl <a href="http://yourapp.herokuapp.com" rel="noreferrer">http://yourapp.herokuapp.com</a>' and a 10 min interval.

blocks|key|3706170|text|我认为最简单的解决方法是每30分钟自我ping一次你自己的服务器。下面是我在node.js项目中用来防止睡眠的代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3706171|const+request+=+require('request');
const+ping+=+()+=>+request('https://<my-app-name>.herokuapp.com/',+(error,+response,+body)+=>+{
++++console.log('error:',+error);+//+Print+the+error+if+one+occurred
++++console.log('statusCode:',+response+&&+response.statusCode);+//+Print+the+response+status+code+if+a+response+was+received
++++console.log('body:',+body);+//+Print+body+of+response+received
});
setInterval(ping,+20*60*1000);+//+I+have+set+to+20+mins+interval|code-block|syntax|javascript|3706172|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I think the easiest fix to this is to self ping your own server every 30 mins.
Here's the code I use in my node.js project to prevent sleeping.

<pre><code>const request = require('request');
const ping = () =&gt; request('https://&lt;my-app-name&gt;.herokuapp.com/', (error, response, body) =&gt; {
 console.log('error:', error); // Print the error if one occurred
 console.log('statusCode:', response &amp;&amp; response.statusCode); // Print the response status code if a response was received
 console.log('body:', body); // Print body of response received
});
setInterval(ping, 20*60*1000); // I have set to 20 mins interval
</code></pre>

blocks|key|2168141|text|这里的大多数答案都过时了，或者目前不起作用。目前个人账户的免费级别是每月550个免费dyno小时的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2168142|一个经过验证的免费账户会给你1000个小时的免费dyno。我写了一篇关于如何让我的免费应用保持清醒的文章。|2168143|https://link.medium.com/uDHrk5HAD0|2168144|希望它能在2019年帮助任何需要解决方案的人|2168145|entityMap|0|LINK|mutability|MUTABLE|url^0|1D|1|0|0|0|Y|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|W|8|@]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|J|3|K|5|6|7|10|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|I]]]]

Most of the answers here are outdated or currently not working. The current free tier for personal accounts are gives a base of 550 free dyno hours each month. 

And a verified free account gives you 1000 hours of free dyno. I wrote an article on how I made my free app stay awake.

<a href="https://link.medium.com/uDHrk5HAD0" rel="nofollow noreferrer">https://link.medium.com/uDHrk5HAD0</a>

Hope it helps anyone who is in need of a solution in 2019

blocks|key|3706294|text|另一个有效的解决方案：wokeDyno这里是一个blog+post，它是如何工作的:它很容易集成到应用程序中：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3706295|/*+Example:+as+used+with+an+Express+app+*/

const+express+=+require("express")
const+wakeDyno+=+require("woke-dyno");

//+create+an+Express+app
const+app+=+express();

//+start+the+server,+then+call+wokeDyno(url).start()
app.listen(PORT,+()+=>+{
++++wakeDyno(DYNO_URL).start();+//+DYNO_URL+should+be+the+url+of+your+Heroku+app
});|code-block|syntax|javascript|3706296|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/fermentationist/wokeDyno|1|https://hackernoon.com/how-to-prevent-your-free-heroku-dyno-from-sleeping-dggxo3bi2^0|B|8|0|O|9|1|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]]]

One more working solution: <a href="https://github.com/fermentationist/wokeDyno" rel="nofollow noreferrer">wokeDyno</a>
Here is a <a href="https://hackernoon.com/how-to-prevent-your-free-heroku-dyno-from-sleeping-dggxo3bi2" rel="nofollow noreferrer">blog post</a> how it works: 
It's integrated in the app very easy:

<pre class="lang-js prettyprint-override"><code>/* Example: as used with an Express app */

const express = require("express")
const wakeDyno = require("woke-dyno");

// create an Express app
const app = express();

// start the server, then call wokeDyno(url).start()
app.listen(PORT, () =&gt; {
 wakeDyno(DYNO_URL).start(); // DYNO_URL should be the url of your Heroku app
});
</code></pre>

blocks|key|3706310|text|一个cron工作就可以了。参见https://cron-job.org。它是免费和可靠的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3706311|entityMap|0|LINK|mutability|MUTABLE|url|https://cron-job.org/^0|F|K|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

A cron job will do. See <a href="https://cron-job.org" rel="noreferrer">https://cron-job.org</a>. It's free and reliable.

blocks|key|1635866|text|将应用程序的URL添加到http://kaffeine.herokuapp.com/。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1635867|从该站点：|1635868|1635869|+Kaffeine每隔30分钟就会ping你的Heroku应用程序，这样它就永远不会进入睡眠状态*|blockquote|1635870|1635871|1635872|​|1635873|📷|atomic|1635874|1635875|entityMap|0|LINK|mutability|MUTABLE|url|http://kaffeine.herokuapp.com/|1|IMAGE|IMMUTABLE|imageUrl|https://i.stack.imgur.com/eIgEs.png|imageAlt^0|C|U|0|0|0|0|0|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@$A|16|B|17|1|18]]|C|$]]|$1|D|3|E|5|6|7|19|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]|$1|G|3|H|5|I|7|1B|8|@]|9|@]|C|$]]|$1|J|3|-4|5|6|7|1C|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|1D|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|1E|8|@]|9|@]|C|$]]|$1|N|3|O|5|P|7|1F|8|@]|9|@$A|1G|B|1H|1|1I]]|C|$]]|$1|Q|3|M|5|6|7|1J|8|@]|9|@]|C|$]]|$1|R|3|-4|5|6|7|1K|8|@]|9|@]|C|$]]]|S|$T|$5|U|V|W|C|$X|Y]]|Z|$5|10|V|11|C|$12|13|14|-4]]]]

Add your app's URL to <a href="http://kaffeine.herokuapp.com/" rel="noreferrer">http://kaffeine.herokuapp.com/</a>.
From the site:
<blockquote>
Kaffeine pings your Heroku app every 30 minutes so it will never go to sleep*
</blockquote>
<a href="https://i.stack.imgur.com/eIgEs.png" rel="noreferrer"><img src="https://i.stack.imgur.com/eIgEs.png" alt="Kaffeine pings your Heroku app every 30 mins so it will never go to sleep" /></a>

blocks|key|15607|text|这是我的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|15608|使用Google+Apps脚本，并设置时间触发器。|15609|//+main.js
function+ping()+{
++UrlFetchApp.fetch("https://<Your+app>.herokuapp.com/ping_from_GAS");
}|code-block|syntax|javascript|15610|这很简单！|15611|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

This is my solution.
Use Google Apps Script, and set time trigger.
<pre class="lang-js prettyprint-override"><code>// main.js
function ping() {
 UrlFetchApp.fetch(&quot;https://&lt;Your app&gt;.herokuapp.com/ping_from_GAS&quot;);
}
</code></pre>
It is very easy!

blocks|key|2172125|text|Freshping是另一个免费资源，可以让你的免费Heroku应用全天候运行。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2172126|entityMap|0|LINK|mutability|MUTABLE|url|https://www.freshworks.com/website-monitoring/^0|0|9|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<a href="https://www.freshworks.com/website-monitoring/" rel="nofollow noreferrer">Freshping</a> is another free resource that can keep your free Heroku app alive 24/7.

blocks|key|3706542|text|各位请注意这一点！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3706543|只使用自由工作者dyno的|3706544|应用程序不会睡眠，因为它们不会响应web请求。请注意这一点，因为它们可能会全天候运行，并消耗您的时间池。|blockquote|3706545|3706546|3706547|(https://devcenter.heroku.com/articles/free-dyno-hours#quota)|offset|length|3706548|entityMap|0|LINK|mutability|MUTABLE|url|https://devcenter.heroku.com/articles/free-dyno-hours#quota^0|0|0|0|0|0|1|1N|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|Z|8|@]|9|@$K|10|L|11|1|12]]|A|$]]|$1|M|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Guys please note this!
<blockquote>
Apps that only utilise a free worker dyno do not sleep, because they do not respond to web requests. Be mindful of this as they may run 24/7 and consume from your pool of hours.
</blockquote>
(<a href="https://devcenter.heroku.com/articles/free-dyno-hours#quota" rel="nofollow noreferrer">https://devcenter.heroku.com/articles/free-dyno-hours#quota</a>)

In the Heroku free apps the dynos seem to keep idling - my app has very low traffic but it's also not really acceptable in my case that my users have to wait 20+ seconds to spin up a new dyno. 

Frankly, with that kind of wait, many will leave before the first page even displays.

So, I have a problem: should I be paying $36 a month to save each user an embarrassingly long 20 seconds when my traffic is in the single-digits per day.

Is there a way around this??

Easy way to prevent Heroku idling?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在Heroku的免费应用程序中，dyno似乎一直处于空闲状态--我的应用程序的流量非常低，但在我的情况下，我的用户必须等待20+秒才能启动一个新的dyno，这也是不能接受的。坦率地说，有了这样的等待，许多人甚至在第一页显示之前就会离开。所以，我有一个问题:我是否应该每月支付36美元，为每个用户节省令人尴尬的长达20秒的...

问防止Heroku空闲的简单方法？
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