Как перезагрузить apache

Как перезагрузить apache

Stopping and Restarting Apache HTTP Server

This document covers stopping and restarting Apache HTTP Server on Unix-like systems. Windows NT, 2000 and XP users should see Running httpd as a Service and Windows 9x and ME users should see Running httpd as a Console Application for information on how to control httpd on those platforms.

  • Introduction
  • Stop Now
  • Graceful Restart
  • Restart Now
  • Graceful Stop

See also

  • httpd
  • apachectl

Introduction ¶

In order to stop or restart the Apache HTTP Server, you must send a signal to the running httpd processes. There are two ways to send the signals. First, you can use the unix kill command to directly send signals to the processes. You will notice many httpd executables running on your system, but you should not send signals to any of them except the parent, whose pid is in the PidFile . That is to say you shouldn’t ever need to send signals to any process except the parent. There are four signals that you can send the parent: TERM , USR1 , HUP , and WINCH , which will be described in a moment.

To send a signal to the parent you should issue a command such as:

kill -TERM `cat /usr/local/apache2/logs/httpd.pid`

The second method of signaling the httpd processes is to use the -k command line options: stop , restart , graceful and graceful-stop , as described below. These are arguments to the httpd binary, but we recommend that you send them using the apachectl control script, which will pass them through to httpd .

After you have signaled httpd , you can read about its progress by issuing:

tail -f /usr/local/apache2/logs/error_log

Modify those examples to match your ServerRoot and PidFile settings.

Stop Now ¶

Sending the TERM or stop signal to the parent causes it to immediately attempt to kill off all of its children. It may take it several seconds to complete killing off its children. Then the parent itself exits. Any requests in progress are terminated, and no further requests are served.

Graceful Restart ¶

The USR1 or graceful signal causes the parent process to advise the children to exit after their current request (or to exit immediately if they’re not serving anything). The parent re-reads its configuration files and re-opens its log files. As each child dies off the parent replaces it with a child from the new generation of the configuration, which begins serving new requests immediately.

This code is designed to always respect the process control directive of the MPMs, so the number of processes and threads available to serve clients will be maintained at the appropriate values throughout the restart process. Furthermore, it respects StartServers in the following manner: if after one second at least StartServers new children have not been created, then create enough to pick up the slack. Hence the code tries to maintain both the number of children appropriate for the current load on the server, and respect your wishes with the StartServers parameter.

Users of mod_status will notice that the server statistics are not set to zero when a USR1 is sent. The code was written to both minimize the time in which the server is unable to serve new requests (they will be queued up by the operating system, so they’re not lost in any event) and to respect your tuning parameters. In order to do this it has to keep the scoreboard used to keep track of all children across generations.

The status module will also use a G to indicate those children which are still serving requests started before the graceful restart was given.

At present there is no way for a log rotation script using USR1 to know for certain that all children writing the pre-restart log have finished. We suggest that you use a suitable delay after sending the USR1 signal before you do anything with the old log. For example if most of your hits take less than 10 minutes to complete for users on low bandwidth links then you could wait 15 minutes before doing anything with the old log.

When you issue a restart, a syntax check is first run, to ensure that there are no errors in the configuration files. If your configuration file has errors in it, you will get an error message about that syntax error, and the server will refuse to restart. This avoids the situation where the server halts and then cannot restart, leaving you with a non-functioning server.

This still will not guarantee that the server will restart correctly. To check the semantics of the configuration files as well as the syntax, you can try starting httpd as a non-root user. If there are no errors it will attempt to open its sockets and logs and fail because it’s not root (or because the currently running httpd already has those ports bound). If it fails for any other reason then it’s probably a config file error and the error should be fixed before issuing the graceful restart.

Restart Now ¶

Sending the HUP or restart signal to the parent causes it to kill off its children like in TERM , but the parent doesn’t exit. It re-reads its configuration files, and re-opens any log files. Then it spawns a new set of children and continues serving hits.

Users of mod_status will notice that the server statistics are set to zero when a HUP is sent.

Graceful Stop ¶

The WINCH or graceful-stop signal causes the parent process to advise the children to exit after their current request (or to exit immediately if they’re not serving anything). The parent will then remove its PidFile and cease listening on all ports. The parent will continue to run, and monitor children which are handling requests. Once all children have finalised and exited or the timeout specified by the GracefulShutdownTimeout has been reached, the parent will also exit. If the timeout is reached, any remaining children will be sent the TERM signal to force them to exit.

A TERM signal will immediately terminate the parent process and all children when in the «graceful» state. However as the PidFile will have been removed, you will not be able to use apachectl or httpd to send this signal.

The graceful-stop signal allows you to run multiple identically configured instances of httpd at the same time. This is a powerful feature when performing graceful upgrades of httpd, however it can also cause deadlocks and race conditions with some configurations.

Care has been taken to ensure that on-disk files such as lock files ( Mutex ) and Unix socket files ( ScriptSock ) contain the server PID, and should coexist without problem. However, if a configuration directive, third-party module or persistent CGI utilises any other on-disk lock or state files, care should be taken to ensure that multiple running instances of httpd do not clobber each other’s files.

You should also be wary of other potential race conditions, such as using rotatelogs style piped logging. Multiple running instances of rotatelogs attempting to rotate the same logfiles at the same time may destroy each other’s logfiles.

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Как остановить и перезапустить Apache в Linux-системах

Как мы все знаем, Apache – это бесплатный кросс-платформенный веб-сервер с открытым исходным кодом, который используется как для статических, так и для динамических веб-страниц.

В этой статье мы остановимся на том, как вы можете запускать и перезапускать веб-сервер Apache в системах Linux с помощью команды apache2.

На Ubuntu/Debian Linux

Давайте посмотрим, как мы можем запустить, остановить и перезапустить веб-сервер apache2 в версиях Ubuntu и Debian

Apache2 Restart/Start/Stop/

Для пользователей Ubuntu и Debian Systemd – Ubuntu 18.04,16.04 и Debian 9.x используются команды ниже:

Запустите Apache2, запустив

Остановите Apache2, запустив

Перезапустите Apache2, запустив

Проверка состояния Apache2:

Чтобы проверить, действительно ли веб-сервер работает, откройте свой браузер и введите IP-адрес своего сервера

Вы должны иметь возможность просматривать страницу Apache по умолчанию, как показано ниже:

Для более старых версий Ubuntu -14.10 и старше, и Debian

Запустите службу Apache2, запустив

Остановите службу Apache2, запустив

Проверка состояния Apache2

На RHEL/CentOS

Apache2 Restart/Start/Stop

Для более новых версий RHEL / CentOS (версии 7.x и выше)

Запустите Apache2, запустив

Остановите Apache2, запустив

Перезапустите Apache2, запустив

Чтобы проверить статус Apache2

Для более старых версий (CentOS / RHEL (Red Hat) Linux версии 4.x / 5.x / 6.x)

Запустите Apache2, запустив

Остановите Apache2, запустив

Перезапустите Apache2, запустив

Чтобы проверить статус веб-сервера Apache

Как и в системах Debian, вы можете проверить, работает ли веб-сервер, открыв браузер и набрав IP-адрес вашего сервера

В Fedora
Apache2 Перезагрузка / Запуск / остановка

На Fedora 22. и более поздних

Запуск вебсервера Apache:

Остановите Apache2, запустив

Чтобы перезапустить Apache2

Чтобы проверить статус Apache2

Чтобы подтвердить, что сервер запущен и поднят в веб-браузере, введите IP-адрес сервера

How do you restart Apache?

I switched from SLES to Ubuntu and now I want to restart my local server. In SLES I used:

but this seems not to work in Ubuntu.

How do I restart Apache?

Zanna's user avatar

13 Answers 13

sudo service apache2 restart for the way that’s borrowed from Red Hat.

Uri's user avatar

Do you want to restart Apache, or do you want to gracefully reload its configuration?

Everyone was answering the first question; you can do the second with

Gracefully reloading is a bit faster, and there’s no downtime.

There’s one caveat: if your apache config files contain an error (e.g. configures a log file in a directory that doesn’t exist), the server may silently exit without printing any error messages to the console. Most other errors are caught by the apache2ctl configtest that service apache2 reload runs before doing the actual reload with apache2ctl graceful .

The recommended way under Ubuntu to start/stop services (not just Apache) is to use the start/stop/reload commands (which really are symbolic links to the initctl program, part of upstart).

For services that use the legacy /etc/init.d scripts, the corresponding script will be called with the correct parameters; for services that use the upstart infrastructure, the appropriate event transition will be signaled to the upstart daemon via initctl.

So, to start/stop/reload/restart apache on Ubuntu, you can use:

Of course you can swap out restart for stop , start and (I think) reload

  1. To restart:
  2. To stop:
  3. To start:

Kulfy's user avatar

As Marius said graceful should be used either to restart:

to stop Apache gracefully.

These commands wait until all requests for web pages have been served before restarting/stopping the web server so that your user’s don’t get half a web page.

First you check your status using this command

then stop the running service

then use this command:

this solution has worked for me.

Byte Commander's user avatar

You can use the systemctl command for apache service restarting; this controls the systemd system and service manager.

For Restarting Apache With systemctl Command:

In case of being hung up or getting no response on restarting you can use the systemctl stop command to stop the service then start with the systemctl start command. Commands are as follows —

For Stopping Apache With systemctl Command:

For Starting Apache With systemctl Command:

You can also use the reload command for only reloading the apache service.

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