Turn off pagespeed #cpanel

Specially this code will be useful when your website is at cpanel hosting you want to test and you are getting issue with #pagespeed. We can simply turn it off by adding the following code to .htaccess

Go to your code and edit .htaccess file and add the following code.

<IfModule pagespeed_module>

ModPagespeed off

</IfModule>

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Understanding the dm-multipath Configuration file /etc/multipath.conf #centos7

Understanding the dm-multipath Configuration file /etc/multipath.conf The main configuration file for DM-Multipath is /etc/multipath.conf . This file is not created by the initial installation of the RPM package. However, the following file is installed in the /usr/share/doc/device-mapper-multipath-[version] directory: multipath.conf – Basic configuration file with some examples for DM-Multipath. This file is used to create the /etc/multipath.conf file. Sample /etc/multipath.conf file The multipath.conf file contains the following sections, and each section contains one or more attributes or subsections. Section Description defaults Defines the default settings for DM-Multipath. These settings can be overwritten by the devices and multipaths sections. blacklist Defines the devices to be excluded from the multipath topology discovery. Devices that are blacklisted are not grouped into a multipath device. blacklist_exceptions Defines the devices to ...

No space left on device: AH00023: Couldn't create the mpm-accept mutex #Apache #linux #centos

#To clean semaphores #If this error is in log Mon Oct 21 14:53:08.684987 2013] [core:emerg] [pid 490] (28)No space left on device: AH00023: Couldn't create the mpm-accept mutex Run the following command #for line in `ipcs -s | grep apache | cut -d " " -f 2`; do ipcrm -s $line; done

Troubleshooting DRBD #Centos #DRBD

Troubleshooting DRBD This article presents common DRBD problems and solutions. DRBD (Distributed Replicated Block Device) runs on the master and slave nodes only, and is responsible for mirroring the contents of a partition between master and slave. Typical problems in DRBD include: A lack of Primary-Secondary connectivity The Secondary operating in standalone mode Both nodes reporting connectivity but neither one in the role of master Both nodes reporting themselves in the role of master Verify the DRBD status The following command is used to verify that DRBD is operating normally on the master and slave nodes. drbd-overview When run on the master node, the output should look like the following: 1:r0/0 Connected Primary/Secondary UpToDate/UpToDate C r----- /mnt/drbd ... When run on the slave node, the output should look like the following: 1:r0/0 Connected Secondary/Primary UpToDate/UpToDate C r----- The following sections are exampl...

Linux/ Centos7/ Tech Info

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