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            xiaoguozi's Blog
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            官網:http://gearman.org/

            跨多種環(huán)境部署 Gearman
            http://www.ibm.com/developerworks/cn/opensource/os-gearman/index.html
            利用開源的Gearman框架構建分布式圖片處理平臺-張宴
            http://blog.s135.com/dips/
            監(jiān)控:
            https://github.com/yugene/Gearman-Monitor

            一、簡介
            Gearman是一個分發(fā)任務的程序架構,由三部分組成:
            Gearman client:提供gearman client API給應用程序調用。API可以使用C,PHP,PERL,MYSQL UDF等待呢個語言,它是請求的發(fā)起者。
            Gearman job server:將客戶端的請求分發(fā)到各個gearman worker的調度者,相當于中央控制器,但它不處理具體業(yè)務邏輯。
            Gearman worker:提供gearman worker API給應用程序調用,具體負責客戶端的請求,并將處理結果返回給客戶端。
            Mogilefs的分布式文件系統(tǒng)的核心就是用gearman實現(xiàn)的。
            這個軟件的應用場景很多,比如視頻網站的視頻處理,分布式日志處理,電子郵件處理,文件同步處理,圖片處理等等,只要是可以放開,不影響體驗和響應的場 景,需要并行進行大量計算和處理的程序都是可以的。Yahoo在60或更多的服務器上使用gearman每天處理600萬個作業(yè)。新聞聚合器digg構建 了一個相同規(guī)模的gearman網絡,每天可處理400000個作業(yè)。
            Gearman不但可以做為任務分發(fā),還可以做為應用方面的負載均衡。可以讓worker放在不同的一堆服務器上,也可以啟動放在同一個cpu的多個核 上。比如,應用視頻轉換程序,不希望web服務器來處理視頻格式轉換,這時,可以在這一堆服務器上進行任務分發(fā),在上面加載worker處理視頻格式,對 外的web服務器就不會被視頻轉換過程影響。而且擴展方便,加一臺服務器到任務調度中心,注冊成worker即可,這時job server會在請求到來的時候,將請求發(fā)送給空閑的worker。還可以運行多個job server,組成ha架構,如果一個job server當?shù)袅耍琧lient和worker會自動遷移到另一臺job server上。

            二、安裝
            [Job Server (gearmand) -- 172.16.1.183]
            1.首先安裝libdrizzle
                #yum install libdrizzle libdrizzle-devel
            2.安裝gearman(兩種方法1.yum2.源碼包)。(c版的server)
                1)yum安裝
                #rpm -ivh http://dl.iuscommunity.org/pub/ius/stable/Redhat/6/x86_64/epel-release-6-5.noarch.rpm
                #yum install -y gearmand
                2)源碼包安裝
                #cd /opt/build/
                #wget https://launchpad.net/gearmand/trunk/0.34/+download/gearmand-0.34.tar.gz
                #tar zxf gearmand-0.34.tar.gz
                #cd gearmand-0.34
                #./configure
                #make && make install
            3.啟動gearman服務
                1)yum安裝方式
                #/etc/init.d/gearmand start
                2)源碼包安裝方式
                #/opt/build/gearmand-0.34/sbin/gearmand -d

                #gearmand -vvv -u root
                INFO Starting up
                INFO Listening on :::4730 (6)
                INFO Creating wakeup pipe
                INFO Creating IO thread wakeup pipe
                INFO Adding event for listening socket (6)
                INFO Adding event for wakeup pipe
                INFO Entering main event loop

            worker&&client以php方式
            [worker --  172.16.1.180]
            安裝gearmand如上所示

            安裝 Gearman PHP extension
            1.下載gearman-0.8.0.tgz并安裝
                #cd /opt/build/
                #wget http://pecl.php.net/get/gearman-0.8.0.tgz
                # yum install -y libgearman-devel.x86_64
                # yum install -y re2c
                #tar zxf gearman-0.8.0.tgz
                #cd gearman-0.8.0.tgz
                #phpize
                # ./configure
                # make && make install
            2.編輯php.ini配置文件加載相應模塊并使之生效
                # vim /etc/php.ini
                extension = "gearman.so"
            3.查看gearman.so模塊是否加載
                # php --info | grep gearman
                gearman
                gearman support => enabled
                libgearman version => 0.14
                PWD => /opt/build/gearman-0.8.0
                _SERVER["PWD"] => /opt/build/gearman-0.8.0
                # php -m | grep gearman
                gearman
            4.啟動job
            gearmand -d
            如果當前用戶是 root 的話,則需要這樣操作:
            gearmand -d -u root
            缺省會使用 4730 端口,下面會用到。
                注意:如果找不到 gearmand 命令的路徑,別忘了用 whereis gearmand 確認

            [client -- 172.16.1.181]
                安裝如work同。如上所示。

            三、測試:
            [Job Server (gearmand) -- 172.16.1.183]
            啟動gearmand

            以命令行工具來驗證gearman的功能
            啟動 Worker:gearman -h 172.16.1.183 -w -f wc -- wc -l &
            運行Client:gearman -h 172.16.1.183 -f wc < /etc/passwd
            42
            可以看到驗證成功。

            以php驗證gearman的功能
            編寫 Worker
            worker.php 文件內容如下:
            <?php
            $worker= new GearmanWorker();
            $worker->addServer('172.16.1.183', 4730);
            $worker->addFunction('reverse', 'my_reverse_function');
            while ($worker->work());
            function my_reverse_function($job) {
            return strrev($job->workload());
            }
            ?>
            設置后臺運行 work
            php worker.php &
            編寫 Client
            client.php 文件內容如下:
            <?php
            $client= new GearmanClient();
            $client->addServer('172.16.1.183', 4730);
            echo $client->do('reverse', 'Hello World!'), "\n";
            ?>
            運行 client
            php client.php
            輸出:!dlroW olleH

            Q:

            I've been trying to get Gearman compiled on CentOS 5.8 all afternoon. Unfortunately I am restricted to this version of CentOS by my CTO and how he has our entire network configured. I think it's simply because we don't have enough resources to upgrade our network... But anyways, the problem at hand.

            I have searched through Server Fault, Stack Overflow, Google, and am unable to locate a working solution. What I have below is stuff I have pieced together from my searching.

            Searches have told said to install the following via yum:

            yum -y install --enablerepo=remi boost141-devel libgearman-devel e2fsprogs-devel e2fsprogs gcc44 gcc-c++ 

            To get the Boost headers working correctly I did this:

            cp -f /usr/lib/boost141/* /usr/lib/ cp -f /usr/lib64/boost141/* /usr/lib64/ rm -f /usr/include/boost ln -s /usr/include/boost141/boost /usr/include/boost 

            With all of the dependancies installed and paths setup I then download and compile gearmand-1.1.2 just fine.

            wget -O /tmp/gearmand-1.1.2.tar.gz https://launchpad.net/gearmand/1.2/1.1.2/+download/gearmand-1.1.2.tar.gz cd /tmp && tar zxvf gearmand-1.1.2.tar.gz ./configure && make -j8 && make install 

            That works correctly. So now I need to install the Gearman library for PHP. I have attempted through PECL and downloading the source directly, both result in the same error:

            checking whether to enable gearman support... yes, shared not found configure: error: Please install libgearman 

            What I don't understand is I installed the libgearman-devel package which also installed the core libgearman. The installation installs libgearman-devel-0.14-3.el5.x86_64, libgearman-devel-0.14-3.el5.i386, libgearman-0.14-3.el5.x86_64, and libgearman-0.14-3.el5.i386.

            Is it possible the package version is lower than what is required? I'm still poking around with this, but figured I'd throw this up to see if anyone has a solution while I continue to research a fix.

            Thanks!


            A:

            This should do the trick:

            export GEARMAN_LIB_DIR=/usr/include/libgearman 
            export GEARMAN_INC_DIR=/usr/include/libgearman

            That should work, if not you'll have to do some minor edits to config.m4.


            other:

            http://gearman.org/gearman_php_extension
            http://blog.csdn.net/aidenliu/article/details/7406390
            http://www.php.net/manual/en/gearmanclient.dobackground.php
            http://www.wenzizone.com/2012/09/27/how_to_fix_rpm_filedigests_payloadisxz_is_needed.html
            http://www.2cto.com/os/201206/136785.html
            http://blog.s135.com/dips
            http://blog.csdn.net/hfahe/article/details/5519582
            http://hi.baidu.com/sunjiujiu/item/4406281c952cf47a7b5f2594

            posted on 2013-01-07 16:39 小果子 閱讀(7890) 評論(0)  編輯 收藏 引用 所屬分類: 學習筆記Linux框架
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