Install Memcache in Linux

Because the libevent class library is required for installing memcached, install libevent first.

Libevent download URL: http://www.monkey.org /~ Provos/libevent/

The installation steps for the libevent-1.4.8-stable.tar.gz version downloaded in this manual are as follows:

1. Extract

Tar xzfv libevent-1.4.8-stable.tar.gz

2. Go to the libevent-1.4.8-stable directory

Cd libevent-1.4.8-stable

3. Compile and install

./Configure

Make

Make install

Note: the/usr/local/lib/directory is installed by default.

Next, install memcached

Memcached download URL: http://www.danga.com/memcached/download.bml

The memcached-1.2.6.tar.gz version is downloaded in this manual

The installation procedure is as follows:

1. Extract

Tar xzfv memcached-1.2.6.tar.gz

2. Go to the memcached-1.2.6 directory

Cd memcached-1.2.6

3. Compile and install

./Configure -- prefix =/local/memcached

Make

Make install

After the installation is complete, the bin and share directories will appear in/local/memcached.

Run the bin directory to start memcache.

The method is as follows:

./Memcached-d-u nobody-m 512 127.0.0.1-p 11211

An exception is reported.

Error while loading shared libraries: libevent-1.4.so.2: cannot open shared object file: No such file or directory

The reason is that the libevent-1.4.so.2 class library cannot be found, the solution is as follows:

Use LD_DEBUG = help./memcached-v to determine the path of the loaded class library. The method is as follows:

LD_DEBUG = libs./memcached-v 2> & 1>/dev/null | less

The system displays:

Linux:/local/memcached/bin # LD_DEBUG = libs./memcached-v 2> & 1>/dev/null | less

20421: find library = libevent-1.4. so. 2; searching

20421: search cache =/etc/ld. so. cache

20421: search path =/lib/tls/i686/sse2:/lib/tls/i686:/lib/tls/sse2:/lib/tls:/lib/i686/sse2: /lib/i686:/lib/sse2:/lib:/usr/lib/tls/i686

/Sse2:/usr/lib/tls/i686:/usr/lib/tls/sse2:/usr/lib/tls:/usr/lib/i686/sse2: /usr/lib/i686:/usr/lib/sse2:/usr/lib (system search path)

20421: trying file =/lib/tls/i686/sse2/libevent-1.4. so. 2

20421: trying file =/lib/tls/i686/libevent-1.4. so. 2

20421: trying file =/lib/tls/sse2/libevent-1.4. so. 2

20421: trying file =/lib/tls/libevent-1.4. so. 2

20421: trying file =/lib/i686/sse2/libevent-1.4. so. 2

20421: trying file =/lib/i686/libevent-1.4. so. 2

20421: trying file =/lib/sse2/libevent-1.4. so. 2

20421: trying file =/lib/libevent-1.4. so. 2

20421: trying file =/usr/lib/tls/i686/sse2/libevent-1.4. so. 2

20421: trying file =/usr/lib/tls/i686/libevent-1.4. so. 2

20421: trying file =/usr/lib/tls/sse2/libevent-1.4. so. 2

20421: trying file =/usr/lib/tls/libevent-1.4. so. 2

20421: trying file =/usr/lib/i686/sse2/libevent-1.4. so. 2

20421: trying file =/usr/lib/i686/libevent-1.4. so. 2

20421: trying file =/usr/lib/sse2/libevent-1.4. so. 2

20421: trying file =/usr/lib/libevent-1.4. so. 2

20421:

./Memcached: error while loading shared libraries: libevent-1.4. so. 2: cannot open shared object file: No such file or directory

We can see that memcached will be found in many places, so based on other requirements, we only need to create a soft link and specify it to the class library we have installed.

The method is as follows:

Ln-s/usr/local/lib/libevent-1.4.so.2/lib/libevent-1.4.so. 2

Now memcached can be started normally.

./Memcached-d-u nobody-m 512 127.0.0.1-p 11211

Here, we can see that memcached has been started, indicating that the installation is successful.

To end the Memcache process, run:

# Kill 'cat/tmp/memcached. Pi'

You can also start multiple daemon processes, but the ports cannot be repeated.

Memcache startup parameters:

-D option is to start a daemon,

-M indicates the amount of memory allocated to Memcache. The unit is MB. Here I am 10 MB,

-U is the user who runs Memcache. Here I am root,

-L is the IP address of the listening server. If there are multiple IP addresses, I have specified the IP address 192.168.0.200,

-P is the port for Memcache listening. I have set port 12000 here, preferably port 1024 or above,

-The "c" option is the maximum number of concurrent connections. The default value is 1024. I have set 256 here, which is based on the load of your server,

-P is the pid file for saving Memcache. Here I am saving it in/tmp/memcached. pid