KeepAlive MaxKeepAliveRequests Apache optimize

-

MaxKeepAliveRequests
MaxKeepAliveRequests limits the number of requests allowed per connection. It is used to control persistent connections. In Ubuntu, the default value of MaxKeepAliveRequests is 100. You can change it to any value you desire. The recommended value of MaxKeepAliveRequests is between 50 and 75.
You can change this value by editing the Apache configuration file.
sudo nano /etc/httpd/httpd.conf
Change the value from 100 to 60.
MaxKeepAliveRequests 60
Save the file and restart Apache.
sudo /etc/init.d/httpd restart
KeepAliveTimeout
KeepAliveTimeout defines how long the server waits for the new request from connected clients. Setting KeepAliveTimeout to a high value may cause performance issues in a heavily loaded web server. In Ubuntu, the default value of KeepAliveTimeout is 15. The recommended value of KeepAliveTimeout is between 1 and 5.
You can change this value by editing the Apache configuration file.
sudo nano /etc/httpd/httpd.conf
Change the value from 15 to 3.
KeepAliveTimeout 3
Save the file and restart Apache.
MaxClients
It sets the limit on the number of simultaneous connections that will be served. Every new connection request will be queued up after this limit. Once a process is freed, then the queued connection will be served. In Ubuntu, the default MaxClients value is 250. It is recommended to keep this value at 150.
You can change this value by editing the “mpm_prefork.conf” file.
sudo nano /etc/httpd/mods-available/mpm_prefork.conf
Change the value from 250 to 150.
MaxClients 150
Save the file and restart Apache.
MaxConnectionsPerChild
It is used to recycle processes. When this limit is set to 0, an unlimited amount of requests are allowed per process. MaxConnectionsPerChild sets the limit on the number of requests that an individual child process will handle. After it reaches the specified limit, the child process will die. In Ubuntu, the defaultMaxConnectionsPerChild value is 100.
The recommended values for this setting are:
·        virtualized server 300
·        server with 1-4GB RAM 500
·        server with 4+GB RAM 1000
You can change this value by editing the “mpm_prefork.conf” file.
sudo nano /etc/httpd/mods-available/mpm_prefork.conf
Change the value from 100 to 300.
MaxConnectionsPerChild 300
Save the file and restart Apache.
KeepAlive
By default, this setting is set to On in Ubuntu. When the Apache server is getting requests from hundreds and thousands of IPs at once, then this setting should be Off. It is recommended to disable this setting to increase connection throughput.
You can disable this setting by editing the Apache configuration file.
sudo nano /etc/httpd/httpd.conf
Change the value from On to Off.
KeepAlive Off
Save the file and restart Apache.
MinSpareServers and MaxSpareServers
It sets the desired minimum and maximum number of idle child server processes. It controls how many unused child-processes Apache will keep alive while waiting for more requests to put them to use. Each child-process consumes resources, so if you set the MaxSpareServers value too high, then it can cause resource problems.
The recommended values for MinSpareServers are:
·        virtualized server 5
·        server with 1-2GB RAM 10
·        server with 2-4GB RAM 20
·        server with 4+ GB RAM 25
The recommended values for the MaxSpareServers value should be set as double that of MinSpareServers.


Comments

Post a Comment

Popular Posts

Connecting to Your Linux Instance from Windows Using PuTTY

-
Image
1.     To generate an RSA key pair to work with version 2 of the protocol, type the following command at a shell prompt: 2.   ssh-keygen -t rsa [pravesh@localhost ~]$ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/pravesh/.ssh/id_rsa): pravesh Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in pravesh. Your public key has been saved in pravesh.pub. The key fingerprint is: ed:5e:fb:5d:87:a2:12:ac:5d:98:1c:59:df:e3:81:1a pravesh@localhost.localdomain The key's randomart image is: +--[ RSA 2048]----+ |                 | |          .      | |         o . o   | |        o.E o +  | | ...
Read more

Install and configure rsyslog Centralized logging server in CentOS

-
 Install and configure rsyslog Centralized logging server in CentOS 6.5 In this tutorial we will learn, how to install and configure rsyslog 7.6 version on RHEL 6.5/CentOS 6.5 .The scenario is, install and setup rsyslog Centralized Logging Server in RHEL/CentOS 6.5. All the logs from client servers will be sent to Centralized logging server i.e rsyslog server. Check Pre-installed rsyslog package Step 1: First of all check the rsyslog package is installed in your system.Generally by-default we get rsyslog version 5.x , after minimal installation of CentOS 6.x / RHEL 6.x We will install the latest rsyslog package. At the time of writing this post, rsyslog stable version 7.6 was available. You can find the latest package information from rsyslog official website Note: By default, RHEL 6.x and CentOS 6.x has rsyslog version 5.x. So here we will update the rsyslog with new version. You can get the rsyslog version information, by using below given two commands rpm -qa|grep rsy...
Read more

How to scan new iSCSI disks in Linux ?

-
How to scan new iSCSI disks in Linux ? 1.First check which are the existing disk available on linux server from fdisk. [root@Centos7 ~]# fdisk -l 2>/dev/null | egrep '^Disk' | egrep -v 'dm-|type|identifier' Disk /dev/xvda: 53.7 GB, 53687091200 bytes, 104857600 sectors Disk /dev/mapper/cl-root: 10.7 GB, 10737418240 bytes, 20971520 sectors Disk /dev/mapper/cl-swap: 5368 MB, 5368709120 bytes, 10485760 sectors Disk /dev/mapper/cl-usr: 10.7 GB, 10737418240 bytes, 20971520 sectors Disk /dev/mapper/cl-home: 2147 MB, 2147483648 bytes, 4194304 sectors Disk /dev/mapper/cl-var: 5444 MB, 5444206592 bytes, 10633216 sectors Disk /dev/mapper/cl-tmp: 2147 MB, 2147483648 bytes, 4194304 sectors 2.Find out how many SCSI controller configured. [root@Centos7 ~]# ls -l /sys/class/scsi_host/ total 0 lrwxrwxrwx 1 root root 0 Dec 11 12:09 host0 -> ../../devices/pci0000:00/0000:00:01.1/ata1/host0/scsi_host/host0 lrwxrwxrwx 1 root root 0 Dec 11 12:09 host1 -> ../../dev...
Read more