Install Memcache in Ubuntu

Install Memcache in Ubuntu

1. Install the apache, php, and mysql environments in Ubuntu: run the following command to minimize setup and installation, and install other extensions step by step as required. Enter the following command at the command prompt:

sudo apt-get install apache2 php5-mysql libapache2-mod-php5 mysql-serversudo apt-get install php5

Ii. Install memcache:

1) install the Memcache Server

sudo apt-get install memcached

After installing the Memcache server, we need to start the service:

memcached -d -m 128 -p 11111 -u root

Here we need to describe the memcached service startup parameters:

-P listening port-l connection IP address, the default value is local-d start to start memcached service-d restart to restart memcached service-d stop | shutdown to disable the running memcached service-d install to install memcached service-d uninstall to uninstall memcached service-u run as (only valid when running as root) -MB maximum memory usage, in MB. By default, an error is returned when 64MB-M memory is used up, instead of deleting the maximum number of concurrent connections in item-c. The default value is 1024-f, and the default value is 1.25-n, key + value + flags are 48-H display help by default

2) install the Memcache Client

sudo apt-get install php5-memcache

After the installation, we need to perform simple configuration in php. ini. Open the/etc/php5/apache2/php. ini file and add the following content at the end:

[Memcache]; a high-performance distributed memory object cache system maintains a unified and huge hash table in the memory. It can be used to store data in various formats, including image, video, file, and database retrieval results .; Whether to transparently transfer data to other servers when an error occurs. Memcache. allow_failover = On; Maximum number of servers allowed to receive and send data, valid only when memcache. allow_failover is enabled. Memcache. max_failover_attempts = 20; data will be transferred according to the block size set by this value. The smaller the value, the more extra network transmission is required .; If you find that the speed cannot be explained is reduced, you can try to increase the value to 32768. Memcache. chunk_size = 8192; default TCP port used to connect to the memcached server. Memcache. default_port = 11111; controls the policy for ing keys to the server. The default value "standard" indicates that the old hash policy of the previous version is used .; Set as "consistent" to allow you to add or delete servers in the connection pool without re-computing the key ing between keys and servers .; Memcache. hash_strategy = "standard"; controls the hash function that maps keys to the server. The default value "crc32" uses the CRC32 algorithm, while "fnv" indicates that the FNV-1a algorithm is used .; FNV-1a than CRC32 speed is slightly lower, but the hash effect is better .; Memcache. hash_function = "crc32 ″

Save php. ini and run sudo/etc/init. d/apache2 restart to restart Apache.

Use Memcache in PHP

 Connect ("localhost", 11111); // connect to the Memcache server $ val = "this is a test. "; $ key = md5 ($ val); $ mem-> set ($ key, $ val, 0,120); // insert a cache, the cache time is 120 s $ k = $ mem-> get ($ key); if ($ k) {// determines whether the specified key echo 'from cache: 'is obtained :'. $ k;} else {echo 'normal'; // here we need to replace it with query database and create cache .}

Memcached installation and startup script

Performance problems of using Memcached in PHP

Install Memcached in Ubuntu and its command explanation

Install and apply Memcached

Use Nginx + Memcached's small image storage solution

Getting started with Memcached

For details about Memcached, click here
Memcached: click here

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