Maxrequestworkers setting apache Calculate a limit value for the MaxRequestWorkers (or MaxClients) and ServerLimit configuration variables as follows: If your instance has more than 4 GB of RAM: Jun 21, 2024 · The Apache Keep-Alive setting allows the same TCP connection for HTTP communication to be used instead of opening a new connection for each new request, i. The MaxRequestWorkers directive is typically set in the Apache configuration file (httpd 400 MaxRequestWorkers with 10 FcgidMaxProcesses Apache optimization settings that truly help While many Apache settings exist, some truly stand out in helping your website perform better and reduce server load. Apr 25, 2019 · I've set the value of maxRequestWorkers to 4000 in the apache2. This should be set to TOTAL_AVAILABLE_MEMORY_RESERVED_FOR_APACHE divided by AVERAGE_SIZE_OF_APACHE_PROCESS (see Apache Performance Tuning). It is essential to tune Apache's MaxRequestWorkers setting to mitigate the risk of resource usage problems that could lead to a crash and to ensure that your server can use the resources available to it. So, the main difference to the event MPM is that Apache does not get locked up, because it simply ignores the ServerLimit and just launches another process, while the old one keeps hanging around indefinitely the same way as with the event MPM (just not labeled "G"), despite the GracefulShutdownTimeout setting). conf file directly and then restarting httpd: Aug 2, 2019 · If ServerLimit is set to a value that is much higher than necessary, extra, unused shared memory will be allocated. Oct 6, 2021 · Hello, Apache2 has Problems with the MaxRequestWorkers Limit. 4以降ではMaxRequestWorkers）は、Apacheが同時に処理できるリクエストの最大数を制限する設定項目です。この設定は、サーバーが処理できるリクエストの上限を定めることで、メモリの過剰消費を防ぎ、サーバーの安定性を確保する役割を担い Jan 20, 2025 · [Wed Jan 08 15:16:30. conf # This configuration file loads a CGI module appropriate to the MPM # Jul 27, 2017 · thanks for advice, its basically apache configuration, and itself more question similar to this posted here than server. Jan 15, 2021 · 概要同時アクセス対策として、apacheのMaxRequestWorkersを増やす対策が可能です。 apacheのバージョン2. The Apache httpd server is running out of MaxRequestWorkers very quickly. 082590 2021] [mpm_worker:error] [pid 789:tid 47280170771520] AH00287: server is within MinSpareThreads of MaxRequestWorkers, consider raising the MaxRequestWorkers setting [Fri Mar 26 07:37:50. 3 FPM Centos 6. d/00-mpn. After a deep look at logs and some research, I found that the issue was a Slowloris DoS attack. Can we look for other logs (more details) somewhere ? EDIT: Apache error_log: [mpm_event:error] [pid 762:tid 139741530629248] AH00484: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting There is 200 concurents users connected. 18 maxes out on concurrent connections: ps auxf | grep apache2 | wc -l 258 As soon as 258 is reached the server is waiting to serve new connections Aug 6, 2018 · AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting I found this page: Apache keeps going down on a Plesk server: server reached MaxRequestWorkers setting I set both values to 300 some weeks ago, but it did not help. server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting Cause The limit continues to be reached because of a DDoS attack, or a very long response time for each request. 5 GB of Memory Please note that the below settings is done from a stock apache configuration. Apr 17, 2021 · #1: MaxRequestWorkers - I was previously using VestaCP and the Apache + mpm-prefork. To increase it, you must also raise ServerLimit. How to increase MaxRequestWorkers? A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more. 227935 2015] [mpm_prefork:error] [pid 1134] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting How can I judge how to set these settings? I would like to change the default max connection numbers in Apache as the number of processes is now # ps -ef | grep apache2 | wc -l 152 I have read that I have to change ServerLimit, but I don't Sites which need to serve more than 256 simultaneous requests may need to increase MaxRequestWorkers, while sites with limited memory may need to decrease MaxRequestWorkers to keep the server from thrashing (swapping memory to disk and back). modules. Compared to Apache 1. Feb 18, 2024 · [mpm_prefork: error] [pid 1] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting => Healtheck error: Error: Timeout of 7000 ms exceeded Feb 10, 2021 · Here you can see that there are 15 httpd processes, consuming a total of 43MiB, so each Apache process is using roughly 3MiB of RAM. Nov 7, 2003 · Hello. For example, if ServerLimit is set to 20, then MaxRequestWorkers will be 20 x 25 = 500. 4) value to fit your needs. Before we start to optimize Apache, you should stop using it to… Jan 26, 2023 · I tried to seize it myself, but I did not succeed The current settings: <IfModule mpm_prefork_module> StartServers 100 MinSpareServers 20 MaxSpareServers 50 ServerLimit 4000 MaxClients 1400 MaxRequestWorkers 8000 MaxConnectionsPerChild 10000 MaxRequestsPerChild 5000 KeepAlive 0 </IfModule>. 4版本，不再使用MaxClients参数，而是使用MaxRequestWorkers参数来达到同样的目的。确认错误日志首先，我们要确认一下是否存在由于Apache并发连接而导致的瓶颈。 Dec 19, 2017 · What should my MaxRequestWorkers and server limits be set to in Apache? Ask Question Asked 7 years, 11 months ago Modified 7 years, 11 months ago Mar 8, 2018 · I understand that Apache web server has 256 request limitation, So I increased the MaxRequestWorkers to 1000 still I get the SSL handshake failure error for few request. So I’m not familiar with the php-fmp and the way Apache is configured on HestiaCP. I still got message "Server reached MaxRequestWorkers setting, consider raising MaxRequestWorkers" but,according to Google analytics, I never had more than 300 users. 즉, ServiceLimit 256 이고 ThreadsPerChild 64로 설정했기 때문에 총 16,384‬개의 동시처리가 가능해집니다. Any advice is helpful, most of my googling just says to "Increase MaxRequestWorkers and set ServerLimit to match" but that didn't help. Look at workers, requests and caching modules to speed up an Apache HTTP server. 2GiB) and round up apache process size to 3MiB. Aug 8, 2024 · MaxRequestWorkers MaxRequestWorkers is a configuration directive in the Apache web server that specifies the maximum number of simultaneous connections that the server can handle. 2 and 2. For non-threaded Prefork servers, MaxRequestWorkers represents the maximum number of child processes that Apache launches to server requests. org Dec 7, 2023 · Hello, we've been getting what seems to be a rudimentary DDoS attack where between 40 and 60 IPs target our root domain by firing GET requests simultaneously for a few minutes. Question How can I tell if Apache is experiencing a DDoS (Distributed Denial-of-Service) attack? Answer If Apache is experiencing a DDoS attack, you may notice that websites on the server are tim Jan 23, 2020 · AH00484: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting and before I figured out what was actually going on, I went to change the values on /etc/apache2/mods-enabled/mpm_event. These are crucial for a smooth user experience and efficient resource usage. Could you please help me. Keep-Alive maintains a persistent connection between client and server. 054743 2018] [mpm_prefork:error] [pid 5215] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting Jul 6, 2023 · Here are five areas of focus to better tune your Apache web server for superior performance, especially if you have a high traffic website! Mar 10, 2023 · MaxRequestWorkers for Apache Posted by Cătălin on Fri, 10 Mar 2023 Tune Apache's MaxRequestWorkers setting to mitigate the risk of resource usage problems Nov 8, 2021 · いわさです。先日、Apacheで構成されるWebサーバーがヘルスチェックに失敗して、Webサーバーへアクセスできなくなってしまいました。 Webサーバーのログを確認してみると、 AH00161 エラーが確認されました。原因として、Apacheで設定している MaxRequestWorkers 値に同時処理可能な接続の最大数を But most importantly adjust the MaxClients (MaxRequestWorkers in 2. It becomes necessary to adjusted ServerLimit when the server is expected to handle more than the default of 256 requests simultaneously. Reduce to previous value. conf to 5000 andn make an Restart of Apache2 Checking the Apache logs of a VPS server with 32 GB RAM and 8-core processor, I find this: [Fri Mar 26 07:35:23. 206899 2023] [mpm_event:error] [pid 80515:tid 140403841104192] AH00484: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting im getting this my conf 01-cgi. X, Tomcat 7 serving JSP/Servlets. Also increasing mean the value mean more CPU, more RAM. This will give "space" of distribute the requests over the processes. With the prefork MPM, use this directive only if you need to set MaxRequestWorkers higher than 256 (default). 6, MariaDB 5. I get the error: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting I'm May 8, 2015 · Can you please try to increase MaxRequestWorkers value on your server to 250 and monitor your Apache services logs, if you are getting same issues that meas your server is under DDOS attack and due to that you are getting this issues, 接続数が 256 に達すると Apache httpd がハングします。error_log に以下のエラーメッセージが表示されます。 AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting Apache httpd サーバーが、MaxRequestWorkers をすぐに使い果たしてしまいます。MaxRequestWorkers を増やすにはどうすればいい Learn what causes the "server reached MaxRequestWorkers" in the Apache web server and how to fix it. We have some problems with AH00484: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers settings AH00485: scoreboard is full, not at MaxRequestWorkers Apache 2. Per the Apache documentation, For non-threaded servers (i. Checking server-status I can see something like this: Srv PID Acc M CPU Hi, just got this message in my apache log : [mpm_worker:error] [pid 13825:tid 139805119400000] AH00287: server is within MinSpareThreads of MaxRequestWorkers, consider raising the MaxRequestWorkers setting I'm using the defaults (Server Limit, Max Request Workers etc) in apache configuration. The setting is respected by any modules which use ap_add_common_vars(), such as mod_cgi, mod_cgid, mod_proxy_fcgi, mod_proxy_scgi, and so on. Mar 29, 2013 · It couldn't even be opened from browser. We would like to show you a description here but the site won’t allow us. In this blog post, we will explore what these directives do, why they are important, and how to tune them effectively. Sites which need to serve more than 256 simultaneous requests may need to increase MaxRequestWorkers, while sites with limited memory may need to decrease MaxRequestWorkers to keep the server from thrashing (swapping memory to disk and back). x is a general-purpose webserver, designed to provide a balance of flexibility, portability, and performance. Also be mindful of the settings you specify, it makes no sense to have 1024 workers and just 10 max spare ones and things like that, which will cause unnecessary overhead. This server has been running smoothly for years without any configuration modifications. Aug 3, 2015 · If Apache is still crashing after increasing MaxRequestWorkers and ServerLimit, you should investigate whether any of your PHP scripts are causing the issue. 5 (64 Bit) Standard DA httpd. 5 with 768mb ram. 4) with 2 Oct 9, 2019 · I've not detected any sign of cyber attack. Once or twice a week, apache crash with the message: [Thu Aug 14 12:38:33. Nov 13, 2016 · cPanel configures Apache to work in the most stable way possible, but with a few tricks the default settings can be improved in order to gain performance and have a better resource usage. The php-fpm process will use about 7. Calculate Apache MaxRequestWorkers To be safe though, reserve 15% of memory for all other processes (in my case ~1. AH00286: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting AH00287: server is within MinSpareThreads of MaxRequestWorkers, consider raising the MaxRequestWorkers setting Have you an idea about what is going on ? Mar 13, 2025 · Today we are experiencing something that resembles a DoS. [Tue Oct 17 14:50:08. Jan 5, 2025 · Apacheで接続数の上限を設定する際に重要となるのが、 MaxClients （または MaxRequestWorkers）と ServerLimit という2つのパラメータです。これらの設定は、Apacheが同時に処理できるリクエスト数の制限を決定し、サーバーのリソース消費を管理するための鍵となり This is in Apache error_log: [Thu Nov 17 17:08:22. MaxRequestWorkers was raised from 256 (default) to 500. Two key configuration directives that can significantly impact the performance and stability of an Apache server are MaxRequestWorkers and ServerLimit. 3. I checked the access logs and there are no other IP addresses but me. How to determine Jul 18, 2023 · [Tue Jul 18 09:03:08. com Jul 17, 2023 · To increase it, you must also raise MaxRequestWorkers using the following formula: ServerLimit value x 25 = MaxRequestWorkers value. Does anyone can help me understand such parameter? I read Apache official documentation but it is still unclear to me Switch to mpm_event rightaway, you have no reason to use prefork if you have php-fpm as backend Apache is no longer constrained to use a non-threaded mpm. This directive can be used instead of the compile-time setting SECURITY_HOLE_PASS_AUTHORIZATION which has been available in previous versions of Apache HTTP Server. Lower it and MySQL's max_connections down to, say, 100. 4 running under windows 2012. Consider how much Feb 16, 2016 · But It doesn't apcu cache! After I restart apache, I see in error_log [Tue Feb 16 17:32:26. AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting. What Is the Default MPM Settings? For Prefork Module StartServers 5 Apache 2. How to calculate the MaxRequestWorkers for Apache httpd 2. Limiting the number of processes to serve requests prevents the server from swapping due to a shortage of RAM. 478815 2025] [mpm_worker:error] [pid 1849:tid 1849] AH00287: server is within MinSpareThreads of MaxRequestWorkers, consider raising the MaxRequestWorkers setting To address this, I modified the Apache configuration as follows: MaxConnectionsPerChild 0 to 1000 <IfModule mpm_worker_module> StartServers 2 Sep 26, 2023 · Many requests were spawned and the apache webserver could not handle everything anymore So it printed this message in the logs: [Tue Sep 26 11:43:15. Today, Apache is shutting down after exceeding the MaxRequestWorkers setting. apache. Consider raising the ThreadsPerChild setting I guess there are some configuration changes that I need to do. In addition to the set of active child processes, there may be additional child processes which are terminating, but where at least one server thread is still handling an existing client connection. Keep-Alive connections for faster loading Jan 23, 2020 · 아파치 에러 로그에 나온 server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers 내용처럼 MaxRequestWorkers 의 설정값을 높게 변경하도록 했습니다. x contains many additional optimizations to increase throughput and scalability. Most of these Feb 11, 2018 · Apache - server reached MaxRequestWorkers #406 Closed nero120 opened on Feb 11, 2018 [Httpd Wiki] Update of "ListOfErrors" by Sling Posted to docs@httpd. But as commented you do not want to have single machine to handle so big amount of requests. May 10, 2016 · I've referred extensively to what documentation I had, plus configurations from previous servers and a lot of online reading to set everything up. Aug 10, 2018 · Your server's physical RAM: 24110 MB Remaining Memory after other services considered: 22963 MB Apache's MaxRequestWorkers directive: 256 <--------- Current Setting Apache MPM Model: prefork Largest Apache process (by memory): 6 MB [ !! ] Your MaxRequestWorkers setting is too low. Feb 19, 2017 · MaxSpareServers 20 ServerLimit 256 MaxRequestWorkers 200 MaxConnectionsPerChild 1000 </IfModule> MaxClients has been renamed MaxRequestWorkers in Apache 2. 6 の MaxRequestWorkers を計算する方法は? Apache httpd の MaxClients を計算する方法は? Apache httpd プロセスが処理できる接続の最大数はどのように判断できますか? Jan 11, 2025 · Apacheのウェブサーバーを使用する際、 MaxRequestWorkers 設定はサーバーの同時接続数を制御する重要なパラメータです。しかし、この値を過剰に高く設定すると、CPUやメモリといったサーバーリソースを圧迫し、結果的にサーバー全体のパフォーマンスが低下するリスクがあります。本記事では AH00326: Server ran out of threads to serve requests. 951302 2016] [mpm_prefork:error] [pid 108] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting And owncloud some times works extremely slow, or just not working (https timeout error). How can I increase MaxRequestWorkers setting? Where do I set this, I could not find the value in any of the config files. 4. Apache doesn't answer, but telnet on 80 connects. Aug 6, 2021 · [mpm_prefork: error] [pid 1] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting The symptom in app, is that it cannot finish the export of the template and it stays loading indefinitely. Tuning these settings ensures efficient connection maintenance and scalability, offering a more responsive server under various conditions. What are the parameters that I should consider while calculating this value ? Oct 13, 2024 · To find out how many simultaneous connections your Apache server can handle, you need to check the configuration of the Multi-Processing Module (MPM), whether it is mpm_prefork, mpm_worker, or mpm_event. 4系の場合はMaxClientsではなくMaxRequestWorkersという表現が使われています。 May 22, 2018 · [Mon May 21 11:21:51. Depending on your available RAM, the default settings are often too high. Oct 20, 2023 · The usual practice when increasing MaxRequestWorkers is to increase also ServerLimit. I also noticed that generally, when the problem occurs, it is following a strong request sucks the Apache Jan 10, 2022 · Wondering what to do about the server reached MaxRequestWorkers setting error in Plesk? Click to read what our Support Team have to say. My apache has gone away a few times and I found in the apache log this error: server reached MaxRequestWorkers setting I checked everything from here: Apache web server goes down: server reached MaxRequestWorkers setting, consider raising the Jan 5, 2021 · This setting is generally used as a safeguard or ceiling against input errors when modifying MaxRequestWorkers. Mar 22, 2014 · [mpm_event:error] [pid 24313:tid 3075319488] AH00484: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting I've configured http-mpm for approximately 5000 threads. 6MiB. MPM Prefork: The default MaxRequestWorkers value is 256. but not to far, thanks for this. If both ServerLimit and MaxRequestWorkers are set to values higher than the system can handle, Apache httpd may not start or the system may become unstable. In this case you should match the value you have set for MaxRequestWorkers, but you should not set the value of this directive any higher than what you might want to set MaxRequestWorkers to. 935022 2016] [mpm_event:error] [pid 27241:tid 139681776355296] AH00484: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting And in access_log there is nothing between 16:41 and 17:21. Apache service goes down frequently on a Plesk for Linux Server: AH00484: server reached MaxRequestWorkers setting - Support Cases - Plesk Knowledge Base Jul 30, 2015 · Basics for tuning your Apache Web Server performance. ServerLimit sets the maximum value for MaxRequestWorkers. The default value is 256. configs Many times the Apache stop Feb 5, 2021 · Building from our last tutorial we will be discussing specific details on how to adjust the previously mentioned Apache configuration directives on the CentOS and Ubuntu types of VPS servers. But not getting any idea. Mar 23, 2023 · Or is there a way to prove that the setting isn't being loaded? (for example, I have removed it from an "ifmodule" block to make sure it isn't getting ignored). My apache 2. You must control the MaxRequestWorkers setting so that your server does not start swapping. 552250 2014] [mpm_prefork:error] [pid 6279] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting Sep 26, 2018 · Values to calculate: Total System Memory Free Buffer / Apache2 MB usage = MaxRequestWorkers, ServerLimit, and MaxClients My Settings: Server Instance (Standard) 1 dedicated vCPU with 3. I keep ServerLimit a bit higher than that, since ServerLimit cannot be changed by a restart, but MaxRequestWorkers can. Click here for the solution. Now I set it to 500, but still no success, still a lot of crashes. [error] server is within MinSpareThreads of MaxClients, consider raising the MaxClients setting Can someone explain what is the meaning of this message ? Could it cause such issue. Special care must be taken when using this directive. , prefork), MaxRequestWorkers translates into the maximum number of child processes that will be launched to serve requests. Aug 6, 2025 · And nowhere else is the GracefulShutdownTimeout set. May 20, 2020 · I am running into traffic issues as apache 2. Jun 19, 2023 · This post will cover scenarios where “AH00161: server reached MaxRequestWorkers setting” is seen in application logs, typically under higher load. e. Also make sure the file you think are using are really being used In our series, we explore how to get the most out of your server through performance tuning in Apache. ~30 Apache processes, 600Mb MemFree. 840628 2023] [mpm_event:error] [pid 59:tid 140018682915656] AH10159: server is within MinSpareThreads of MaxRequestWorkers, consider raising the MaxRequestWorkers setting Is there a way to httpd log somehow when there are no more workers available? For example, it could log the date and time workers became unavailable and log again when there are workers available Apache keeps going down on a Plesk server and causing trouble? Our Support Engineers are here to help you out. See full list on bobcares. Dec 19, 2019 · Apache's MaxRequestWorkers at 512 takes a bunch of RAM and threatens to overwhelm MySQL with too many concurrent connections. The text was updated successfully, but these errors were encountered: Msarnaot changed the title Increase the MaxRequestWorkers for Aug 25, 2017 · [Mon Aug 14 18:42:39. May 24, 2019 · The limit value is calculated by dividing the typical average memory use of an Apache process into the total percent of memory that you want to allocate to Apache. Feb 20, 2025 · Is there a place in the UI where I can see the settings for MaxRequestWorkers being used for apache? I set it up editing the /etc/httpd/conf. EDIT: we just receive this message (dmesg) minute ago Jun 14, 2018 · apache crashed yesterday with the new settings: [Tue Jun 26 21:49:04. 5 Gio or RAM). Installed Monit to have possibly more infos In addition to the set of active child processes, there may be additional child processes which are terminating, but where at least one server thread is still handling an existing client connection. How does apache2buddy perl sc I want to set an optimum value for MaxClient in apache for my production server. Resolution Use the following guides to identify whether the problem is caused Sep 12, 2013 · I am running centos 5. conf Update the values in the configuration file. This guide covers key techniques like caching, compression, and limiting access to resources for better results. As a result, requests are being served slowly or not served at all and therefore the websites become inaccessible, even though the server's CPU and RAM resources are not exhausted. Apache continually reaches MaxRequestWorkers limit after restart. i keep getting server reached MaxClients setting, consider raising the MaxClients setting in the logs also apache runs really slow. The issue resolved after restarting apache. conf file. Use the MaxRequestWorkers (Apache 2. when i look at cacti grap MaxRequestWorkers and ThreadsPerChild are used to limit the amount of active processes; meanwhile, ServerLimit takes also into account the ones doing a graceful close to allow extra slots when needed. That way you will be able to see the real usage and traffic volume and do fine adjustments later. The number of allowed connections depends on settings like MaxRequestWorkers (previously known as MaxClients). 017960 2023] [mpm_prefork:error] [pid I have a server with 128 GB RAM, 8 CPU Cores is there a good way to determine how many connections my server can handle. Exactly which file should I edit to set MaxRequestWorkers and the other settings as shown? Jul 9, 2009 · The articles below should help: Apache service goes down frequently on a Plesk for Linux Server: AH00484: server reached MaxRequestWorkers setting Apache keeps going down after increasing MaxRequestWorkers many times If the issue still arises, even when you keep increasing the number of workers, there should be something that causes such behavior. 917495 2017] [mpm_prefork:error] [pid 23163] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting After that, I had asked to change the value "MaxRequestWorkers", but it did not change anything, the problem is still there. Learn how to optimize your Apache configuration for high traffic websites and improve website performance. 9 Php 5. Optimize your Apache server with crucial settings like `KeepAlive` and `MaxClients` to enhance performance and manage server load during traffic spikes. (with stop/start apache after each change in configuration file). To determine the correct setting, look at your average Apache process size to get usage x MB. It could be that some of your scripts are taking a long time to execute and thus occupying Apache workers longer than they should. After that I checked the apache logs and found follwing lines. If both ServerLimit and システムの物理メモリーと CPU コアに基づき、RHEL7 の Apache httpd 2. Apr 26, 2025 · Apache Prefork MPM Configuration details for Apache 2. This Wordpress site is hosted in AWS Lightsail on a Bitnami virtual image running the Wordpress package (PHP 7. There is a set number of requests that Apa To increase it, you must also raise MaxRequestWorkers using the following formula: ServerLimit value x 25 = MaxRequestWorkers value. Up to MaxRequestWorkers terminating processes may be present, though the actual number can be expected to be much smaller. Sep 2, 2019 · Therefore, to increase MaxRequestWorkers to a value that requires more than 16 processes, you also need to raise ServerLimit. x is capable of high performance in many real-world situations. Apr 29, 2016 · In the apache error logs, we found a "Server reached MaxRequestWorkers" error, but the traffic was very slow (30 - 40 visitors active). This article provides basic guidance for tuning MaxRequestWorkers. Thanks! Dec 27, 2024 · I understand Idle/Busy workers 96/3 means my MaxRequestWorkers 512 was never applied. But when i run the apache2buddy perl script the reported value is 150 for maxrequestworkers. 4) parameter in the Apache configuration to set the quota. Aug 19, 2014 · 0 I'm trying to set properly an apache installation on an aws instance EC2 m3 Large (with 7. Start increasing the number daily until you start getting OOMs again. Oct 18, 2016 · What httpd conf settings do I need to change to increase the max number of concurrent connections for Apache? NOTE: I turned off KeepAlive since this is mainly an API server. Dec 26, 2016 · In error_log file I can see this: " [mpm_worker:error] [pid 2559:tid 140190319810368] AH00286: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting", but increasing this value has no effect. It determines the maximum number of child processes or threads that can be spawned by the server to handle incoming requests. How to optimize Apache server to handle heavy load on server. Jul 10, 2020 · So you can set easily ServerLimit 1000 and MaxRequestWorkers 1000. 808863 2025] [mpm_prefork:error] [pid 1:tid 1] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting The status of container is running but it is completely unresponsive, neither its getting restarted The server reached MaxRequestWorkers setting item in your Apache error log is rather clear: the websites require more system resources than are currently permitted. 6 in RHEL7 based on physical memory and cpu core in the system? How to calculate the MaxClients for Apache httpd? How to determine the max number of connection Apache httpd process can handle it. conf. This guide includes practical tips, configuration examples, and insights on monitoring and security Feb 27, 2015 · This guide provides you with information on tuning the performance and configuration of your Apache web server to optimize the load times of your website. Our third tutorial explores Apache MPM Modules and recommended directive settings for environments. Before you begin: Stop Tenable Security Center, as described in Start, Stop, or Restart Tenable Security Center. Jul 2, 2022 · Try these settings: <IfModule mpm_event_module> StartServers 4 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxRequestWorkers 800 ServerLimit 32 MaxConnectionsPerChild 10000 </IfModule> The easiest way for configuring MaxRequestWorkers: ServerLimit x ThreadsPerChild = MaxRequestWorkers Sep 30, 2020 · "AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting". 236380 2018] [mpm_worker:error] [pid 3206:tid 140035442734330] AH00287: server is within MinSpareThreads of MaxRequestWorkers, consider raising the MaxRequestWorkers setting Sep 20, 2023 · AH00287: server is within MinSpareThreads of MaxRequestWorkers, consider raising the MaxRequestWorkers setting AH00286: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting the scoreboard full message on the third node happened about an hour after these messages. 摘要为了同时处理多个请求，您可以将Apache的MaxRequestWorkers参数设置得更大。对于Apache 2. sh on the web, but then after awhile the Apache was reporting this error: [Tue Apr 21 16:45:42. x or later, and your instance manages fewer than 10,000 active IPs. If ServerLimit is set to a value much higher than necessary, extra, unused shared memory will be allocated. Apache unresponsive (site down) or crashes, MaxRequestWorkers setting reached Ask Question Asked 10 years, 9 months ago Modified 10 years, 8 months ago If you are trying to set the value equal to or lower than MinSpareServers, Apache HTTP Server will automatically adjust it to MinSpareServers + 1. Apache 2. I am searching for solution from last couple of days. Although it has not been designed specifically to set benchmark records, Apache 2. If both ServerLimit and MaxRequestWorkers are set to values higher than the system can handle, Apache server may not start or the system may become unstable. Most of these Mar 15, 2023 · Reduce MaxRequestWorkers by half, wait for a day to make sure that you are not getting OOMs. 536138 2021] [proxy_fcgi:error] [pid Jul 13, 2016 · Every 3-5 minutes, apache crashes with this error: [mpm_prefork:error] [pid 7390] AH00161:server reached MaxRequestWorkers setting Right when it crashes, I have about 900M free memory of 2G. Mar 23, 2023 · Cause Too high values are set for the Apache MaxRequestWorkers and ServerLimit directives, due to which all RAM is being used by Apache and new processes cannot be spawned. Tenable recommends the following settings based on the size of your deployment: Restart Tenable Security Center, as described in Start, Stop, or Restart Tenable Security The default settings in the Apache configuration file are sufficient if you are upgrading from Tenable Security Center version 6. Most of these Symptoms Apache keeps going down after reaching the MaxRequestWorkers limit even after increasing it multiple times. Oct 17, 2023 · Hello, One server is currently experiencing an issue with Apache. The MaxRequestWorkers limit set for the Apache web server has been reached and there are no free workers to serve new requests to Apache. Symptoms Apache takes in requests for the content that you are hosting in your environment and sends that information out to anyone that is requesting it. The "stack" of a server I am building is as follows: CentOS 7, Apache 2. Mar 20, 2025 · I have a wordpress site hosted in a docker container with webserver apache, my site go down and the last log of the container was [Wed Mar 19 14:48:04. Can't do anything but restart. Also, Server Density shows at 17:08 (same time as Apache error_log) Jan 5, 2025 · MaxClients（Apache 2. Jul 13, 2017 · Calculate apache MaxRequestWorkers To be safe though, I’ll reserve 15% of memory for all other processes (in my case ~2,4GiB) and round up apache process size to 5MiB. Apache httpdサーバーには、同時接続の最大値が決まっている。 [mpm_event:error] [pid 3425:tid 281472892462448] AH00484: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting [mpm_event:error] [pid 3425:tid 281472892462448] AH10159: server is within MinSpareThreads of MaxRequestWorkers, consider raising the MaxRequestWorkers setting など Jun 29, 2019 · AH10159: server is within MinSpareThreads of MaxRequestWorkers, consider raising the MaxRequestWorkers setting AH00484: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting Feb 16, 2015 · Same problem occurred this morning again, despite the changes: [mpm_prefork:error] [pid xxxxx] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers. Nov 14, 2023 · I've had a problem with Apache since this morning, I can no longer access the websites. Resolution Decrease the values of the MaxRequestWorkers and ServerLimit directives: Note: The default value of MaxRequestWorkers and ServerLimit is 256. To update the Apache configuration file: Navigate to the Apache configuration file, located at /opt/sc/support/conf/mpm. 3, release 2. See also Aug 20, 2008 · server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting In this case,I restart apache and nginx services but my sites could not be loaded until I restart php-fpm54. When ever it restarts there seems to be about 1-2 mins of downtime. Tuning Apache's MaxRequestWorkers setting is essential to mitigate the risk of resource usage problems that could lead to a crash and ensure that your server can use its available resources. i changed it in /etc/apache2/mods-available/mpm_prefork. How can we increase this in a running wordpress instance on kube and stop it from restarting. My settings before the change were as follows: <IfModule mpm_prefork_module> Apr 22, 2015 · I found a script called apachetuneit. Feb 7, 2018 · Hello, I use apache with nginx and php-fpm. Based on your input you should increase the number of filehandlers to (at least) 20480 Sep 27, 2021 · I read about the Apache mpm-prefork configuration and I tried to tune the MaxRequestWorkers parameter. ucdrlzu xdk ikd semc kwwn thcxzy jujja ihfwedk vqqviw ajozod wvaw krvg abwh yoeppnw heady