第1步：安装memcached

要在Ubuntu上安装Memcached，请运行以下命令

sudo apt-get update
sudo apt-get install memcached

运行上述命令后，系统应更新并安装Memcached软件包。
可以在安装期间安装其他必需的包。

Memcached是一种高性能的内存缓存系统，可用于加快使用数据库的应用程序和网站。
memcached不会写入磁盘，而是将其内容存储在系统内存中，这使其更快。

第2步：配置memcached

安装MEMCACHED后，下面的命令可用于查看有关MEMCACHED的帮助信息。

memcache -h

Memcached默认配置文件位于：

/etc/memcached.conf

运行以下命令以编辑文件

sudo nano /etc/memcached.conf

我们应该看到以下这些默认设置：

# memcached default config file
# 2003 - Jay Bonci <jaybonci@debian.org>
# This configuration file is read by the start-memcached script provided as
# part of the Debian GNU/Linux distribution.
# Run memcached as a daemon. This command is implied, and is not needed for the
# daemon to run. See the README.Debian that comes with this package for more
# information.
-d
# Log memcached's output to /var/log/memcached
logfile /var/log/memcached.log
# Be verbose
# -v
# Be even more verbose (print client commands as well)
# -vv
# Start with a cap of 64 megs of memory. It's reasonable, and the daemon default
# Note that the daemon will grow to this size, but does not start out holding this much
# memory
-m 64
# Default connection port is 11211
-p 11211
# Run the daemon as root. The start-memcached will default to running as root if no
# -u command is present in this config file
-u memcache
# Specify which IP address to listen on. The default is to listen on all IP addresses
# This parameter is one of the only security measures that memcached has, so make sure
# it's listening on a firewalled interface.
-l 127.0.0.1
# Limit the number of simultaneous incoming connections. The daemon default is 1024
# -c 1024
# Lock down all paged memory. Consult with the README and homepage before you do this
# -k
# Return error when memory is exhausted (rather than removing items)
# -M
# Maximize core file limit
# -r

编辑后保存文件。

下面的命令可用于启动，启动和重新启动memcached。

sudo service memcached stop
sudo service memcached start
sudo service memcached restart