memcached Walkthrough (1) Build memcached service

Memcached has been fire for many years, and now online about memcached Resources quite a lot, I will not waste words. Simply write a combat series, adhere to all with the implementation of speaking.

Environment Introduction

Linux virtual machines

Kernel information

[Email protected] ~]# uname-a
Linux HADOOP1 2.6.32-358.el6.i686

Memory: 1G

installation process

1. Prepare the compilation environment, install the necessary gcc,make tools, if not installed Yum, preferably installed. There are many shared Yum sources on the web.

2. Download the latest version of Libevent

# wget https://github.com/libevent/libevent/releases/download/release-2.0.22-stable/libevent-2.0.22-stable.tar.gz

3. Unzip the libevent corresponding compression package

# tar ZXVF libevent-2.0.22-stable.tar.gz

File path after decompression:/u01/software/libevent-2.0.22-stable

3. Compiling libevent

# cd/u01/software/libevent-2.0.22-stable#./configure-prefix=/usr/local/libevent# make# make install confirm installation result # LS-AL/US R/local/lib |grep libevent

4. Download the latest version of memcached

# wget Http://memcached.org/latest

5. Unzip the memcached corresponding compression package

Tar zxvf memcached-1.4.29.tar.gz

File path after decompression:/u01/software/memcached-1.4.29

6. Compiling memcached

# cd /u01/software/memcached-1.4.29# [[email protected] memcached-1.4.29]# ./ Configure  -help ' Configure '  configures memcached 1.4.29 to adapt to  many kinds of systems. Usage: ./configure [option]... [var=value] ... configuration:  -h, --help               display this help and exit      --help= Short        display options specific to this  package      --help=recursive    display the  short help of all the included packages  -v, --version            display version information  And exit  -q, --quiet, --silent   do not print  ' checking&nbsp ... '  messages       --cache-file=file   cache test results in file [ disabled]  -c, --config-cache      alias for  '-- Cache-file=config.cache '   -n, --no-create          do not create output files      --srcdir=dir         find the sources in DIR [configure dir  or  ' ... ' installation directories:  --prefix=prefix          install architecture-independent files in PREFIX                            [/usr/locAl] ... fine tuning of the installation directories:  --bindir=dir             user executables [EPREFIX/bin]   --sbindir=DIR           system admin  executables [eprefix/sbin]  --libexecdir=dir         program executables [eprefix/libexec]  --sysconfdir=dir         read-only single-machine data [prefix/etc]  --sharedstatedir=dir     modifiable architecture-independent data [prefix/com]  -- Localstatedir=dir     modifiable single-machine data [prefix/var]   --libdir=DIR            object  Code libraries [eprefix/lib]  --includedir=dir        c header files [ Prefix/include]  --oldincludedir=dir     c header files for  non-gcc [/usr/include]  --datarootdir=DIR        read-only arch.-independent data root [prefix/share]  --datadir=dir            read-only architecture-independent data [ Datarootdir]  --infodir=dir           info  documentation [DATAROOTDIR/info]  --localedir=DIR          locale-dependent data [DATAROOTDIR/locale]  --mandir=DIR             man documentation [datarootdir/man]   --docdir=DIR            documentation root [datarootdir/doc/ Memcached]  --htmldir=dir           html  documentation [DOCDIR]  --dvidir=DIR             dvi documentation [DOCDIR]  --pdfdir=DIR             pdf documentation [docdir]  --psdir=dir              ps documentation [ docdir]  optional packages:  --with-package[=arg]    use  package [arg=yes]  --without-package       do not  use package  (Same as --with-package=no)   --with-libevent=PATH      specify path to libevent installation     # ./configure --prefix=/usr/local/ Memcached  --with-libevent=/usr/local/lib/  # make    # make  install

This time memcached installation was successful.

Start memcached

#/usr/local/memcached/bin/memcached Error

Error while loading shared Libraries:libevent-2.0.so.5:cannot open Shared object file:no such file or directory

Solution Ideas

# #跟踪运行memcached所有加载库文件的路径

 LD_DEBUG=libs LD_DEBUG=libs ./memcached -v     15862:      find library=libevent-2.0.so.5 [0]; searching      15862:      search cache=/etc/ld.so.cache      15862:      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)      15862:        trying file=/lib/tls/i686/sse2/libevent-2.0.so.5      15862:       trying file=/lib/tls/i686/libevent-2.0.so.5      15862:       trying file=/lib/tls/sse2/libevent-2.0.so.5      15862:       trying file=/lib/tls/libevent-2.0.so.5      15862:       trying file=/lib/i686/sse2/ libevent-2.0.so.5     15862:       trying  file=/lib/i686/libevent-2.0.so.5     15862:        trying file=/lib/sse2/libevent-2.0.so.5     15862:        trying file=/lib/libevent-2.0.so.5

First confirm that a soft connection is established

# ls/usr/local/lib/libevent-2.0.so.5/usr/local/lib/libevent-2.0.so.5#ln-s/usr/local/lib/libevent-2.0.so.5/usr/ Lib/i686/libevent-2.0.so.5

If logged in as root, you must specify the-u parameter

/usr/local/memcached/bin/memcached-u Hadoop

Confirm that the memcached is starting successfully

# ps -ef |grep memcachedhadoop   15891  4034  0  22:45 pts/4    00:00:00 /usr/local/memcached/bin/memcached -u  hadooproot     15899 15561  0 22:45 pts/5     00:00:00 grep memcached# netstat -tlnp |grep memcachedtcp         0      0 0.0.0.0:11211                0.0.0.0:*                    LISTEN       15891/memcached     tcp         0      0 :::11211                     :::*                          LISTEN       15891/memcached

Finally, Telnet confirms that the

# telnet 127.0.0.1 11211Trying 127.0.0.1...Connected to 127.0.0.1.Escape character is ' ^] '. Statsstat pid 15891STAT Uptime 86STAT Time 1470494793

Ok. This memcached1.4.9 version has been successfully installed on the machine. The most troublesome part of personal feeling is to deal with Libevent.

We have consulted a lot of resources to solve the problem.

memcached setting up self-booting

For convenience, the memcached will now be executed under the Change permissions

1. The simplest way to start

   Simply add a row to the/etc/rc.d/rc.local
   /usr/local/memcached/bin/memcached-d-M 20-p 11211-u Hadoop

Attention

-D: Set as background process

-U: Point to User

-P: Port

-M: Memory

1. Recommended Way

2.1. Copy the MEMCACHED.SYSV copy of the memcached source package to/ETC/INIT.D as a memcached startup script

# cp/u01/software/memcached-1.4.29/scripts/memcached.sysv/etc/init.d/memcached

[[Email protected] bin]# vi /etc/init.d/memcached #! /bin/sh## chkconfig:  - 55 45# description:  The memcached daemon is a  network memory cache service.# processname: memcached# config: /etc/ Sysconfig/memcached# source function library.  /etc/rc.d/init.d/functionsport=11211user=nobodymaxconn=1024cachesize=64options= "" if [ -f  /etc/sysconfig/memcached ];then    . /etc/sysconfig/memcachedfi# check  that networking is up.if [  "$NETWORKING"  =  "no"  ]then     exit 0firetval=0prog= "memcached" start  ()  {    echo - n $ "starting  $prog: "     # insure that /var/run/memcached  has proper permissions    chown  $USER  /var/run/memcached    daemon memcached -d -p  $PORT  -u  $USER   -m  $CACHESIZE  -c  $MAXCONN  -p /var/run/memcached/memcached.pid $ options    retval=$?    echo    [  $RETVAL  -eq 0 ] && touch /var/lock/subsys/memcached}stop  ()  {     echo -n $ "stopping  $prog: "     killproc  memcached    retval=$?    echo    if [ $ retval -eq 0 ] ; then        rm -f  /var/lock/subsys/memcached        rm -f /var/run/memcached/ memcached.pid    fi}restart  ()  {    stop     start}# see how we were called.case  "$"  in    start)          start        ;;     stop)     stop    ;;     status)     status memcached    ;;     restart|reload)     restart    ;;     condrestart)     [ -f /var/lock/subsys/memcached ]  && restart | |  :    ;;     *)     echo $ "usage: $0 {start|stop|status|restart| Reload|condrestart} "    exit 1esacexit $?

Modify the following sentence (in fact, the memcached command points to our full path)

Daemon memcached -d-p $PORT-u $USER-M $CACHESIZE-C $MAXCONN-P/var/run/memcached/memcached.pid $OPTIONS

Daemon /usr/local/memcached/bin/memcached -d-p $PORT-u $USER-M $CACHESIZE-C $MAXCONN-P/var/run/memcached /memcached.pid $OPTIONS

Configuring self-booting

[[email protected] bin]# chkconfig memcached on[[email protected] bin]# chkconfig |grep memcachedmemcached 0:off 1 : Off 2:on 3:on 4:on 5:on 6:off

Installing NC

[[email protected] yum.repos.d]# Yum install NC

Memcached comes with the stats command, not very friendly to the search. For a good search, use the NC tool.

For example, to find connection-related parameters

[Email protected] yum.repos.d]# echo Stats | NC 127.0.0.1 11211 |grep connectionstat curr_connections 10STAT total_connections 13STAT connection_structures 11

With the form of NC use, personal reference online resources, a simple list of

Watch "Echo Stats | NC 127.0.0.1 11211 "printf" stats\r\n "| NC 127.0.0.1 11211echo Stats | NC 127.0.0.1 11211

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The End

Next, the walkthrough is to access Memcachd through the Telnet command line and the Java Client tool.

This article is from a "simple" blog, so be sure to keep this source http://dba10g.blog.51cto.com/764602/1835163

memcached Walkthrough (1) Build memcached service