How to put a website into memory to speed up the website under Linux

/dev/shm/ is a device file, which uses the tmpfs file system (Note: Under Centos and Redhat, the /dev/shm directory is a link pointing to the /run/shm directory, in Ubuntu The tmpfs file system under the system corresponds to the /run/shm directory, which can be viewed using the df command), because the /dev/shm/ directory is not on the hard disk, but in the memory. It is the so-called tmpfs. You can see through the command df -h that the default size of tmpfs is half of the physical memory, and of course it can be adjusted according to the actual situation.

First create a directory wpcache for wordpress cache files

mkdir /dev/shm/wpcache

Give read, write and execute permissions

chmod 1777 /dev/shm/wpcache

Mount tmpfs to the /cache directory generated by the wordpress cache plug-in

mount --bind /dev/shm/wpcache /home/wwwroot/trojansun.com/wp-content/cache ls -ld /dev/shm/wpcache

Return content similar to the following to indicate successful mounting

drwxrwxrwt 3 www www 60 Jul 31 22:50 /dev/shm/wpcache

At this time, the cache plug-in will regenerate the static page file. After a while, you can check the usage of tmpfs by command df -h.

Two issues to note:

1. Adjust the cache page expiration time in the wordpress cache plug-in according to the actual situation (memory size, number of articles), otherwise it will take up too much memory;

2. Pay attention to adding a swap partition to prevent backup when the memory is not enough. If the physical memory is less than 4G, set the swap partition size to 2G.

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