centos6 | 易学教程

How does a socket event get propagated/converted to epoll?

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问题 I am curious how epoll_wait() receives the event that a registered socket (with epoll_ctl()) is ready for read/write. I believe that glibc magically handles it. Then, is there a document describing how the following events can be triggered for a socket? EPOLLPRI EPOLLRDNORM EPOLLRDBAND EPOLLWRNORM EPOLLWRBAND EPOLLMSG EPOLLERR EPOLLHUP EPOLLRDHUP P.S. Originally I was trying to paste the enum EPOLL_EVENTS in sys/epoll.h on my box here; stackoverflow thinks that I don't format the code block

CentOS6下ssh无法连接

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实验系统：centos6.6 ，内网IP：192.168.6.61 ssh无法连接问题通常想到的就是端口问题了，如22是不是没在防火墙之内了（但是centos默认22端口开启），首先，查看防火墙配置：查看打开的端口：# vi /etc/sysconfig/iptables 但是， 22端口是默认打开的：此时，SSH还是无法连接！一怒之下，直接关闭防火墙。。。 centos 7： systemctl stop firewalld.service #停止 systemctl disable firewalld.service #禁用之前的版本： service iptables stop #停止 chkconfig iptables off #禁用 SSH还是无法连接在他人指导下，发现可能问题在ifcfg-eth0文件的配置上 root下，输入命令： vi /etc/sysconfig/network-scripts/ifcfg-eth0 使用方向键移动光标，修改ONBOOT=no 为 ONTBOOT=yes Done! ONBOOT=no #当计算机重启时，网络是不会自动连接的，还得需要配置ifcfg-eth0文件使计算机重启后自动激活网卡并连接互联网 ONBOOT=yes #系统启动时是否自动加载来源： oschina 链接： https://my.oschina

Django Apache and Virtualenv ImportError: No module named site

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问题 The error from apache after a 504 page [info] mod_wsgi (pid=): Python home /var/venv/mybox. [info] mod_wsgi (pid=): Initializing Python. ImportError: No module named site This is with a barely configured app. <IfModule mod_wsgi.c> WSGIDaemonProcess myapp python-home=/var/venv/mybox WSGIProcessGroup myapp WSGIScriptAlias / /var/www/html/web/myapp/wsgi.py WSGISocketPrefix /var/run/wsgi <Directory /var/www/html/web> <Files wsgi.py> Order deny,allow Allow from all </Files> </Directory> </IfModule

configuring tomat's server.xml file with auto generating mod_jk.conf

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问题 I am using apache (2.2.15) and tomcat6 (6.0.24) on CentOS 6.4 and would like to use the feature with tomcat server that generates the mod_jk.conf file automatically by adding: <Listener className="org.apache.jk.config.ApacheConfig" workersConfig="/usr/share/tomcat6/conf/jk/workers.properties" modJk="/usr/lib/httpd/modules/mod_jk.so" /> in tomcat's server.xml file just before </Engine> tag. It work just fine and generates the mod_jk.conf file for me. Here is a copy of the generated mod_jk.conf

How to start/stop/flush OpenCPU on CentOS6?

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问题 I've successfully built and installed OpenCPU and RStudio Server on a CentOS6. Everything is working as expected, and I do get successful GET/POST responses for my local R packages. A couple of things that don't seem to work however: I can't figure a clean way to start/stop/flush OpenCPU. I'm currently using apachectl restart but I'm not even sure that does reload R packages as expected. I tried Jeroen's bash scripts at /usr/lib/opencpu/scripts but they seem to require quite a bit of tweaking

PKCS#11 engine does not work in openssl on centos 6

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问题 I want to add a PKCS#11 engine to OpenSSL and I use CentOS 6.2. I actually load engine with no problem as you can see below: [root@localhost 05:06:18 openssl-1.0.1e]$ openssl engine -t dynamic -pre SO_PATH:/usr/lib/openssl/engines/engine_pkcs11.so -pre ID:pkcs11 -pre LIST_ADD:1 -pre LOAD -pre MODULE_PATH:/usr/local/lib/libsst.so (dynamic) Dynamic engine loading support [Success]: SO_PATH:/usr/lib/openssl/engines/engine_pkcs11.so [Success]: ID:pkcs11 [Success]: LIST_ADD:1 [Success]: LOAD

How to reduce TTFB (Time to First byte) of my magento application?

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问题 Please help me reduce TTFB of my website (magento) which is running on VPS Dedicated Hosting with CentOS release 6.6 (Final). Current Time To First Byte is: 19.427 seconds 回答1: Just caches don't improve performance, they reduce hardware utilization for repeated requests. While implementing the Will Farrell's other suggestions, you need to identify those parts of Magento code that are slow. For that, you will need to enable Magento Profiler – the built in Magento tool that lets you see what

PHP Unable to load dynamic library '/usr/lib64/php/modules/module.so

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php --version PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/module.so' - /usr/lib64/php/modules/module.so: cannot open shared object file: No such file or directory in Unknown on line 0 PHP 5.3.3 (cli) (built: Dec 11 2013 03:29:57) Copyright (c) 1997-2010 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies user1824955 I check all file in : /etc/php.d/ It was mcrypt.ini with this line extension=module.so but module.so not exist in /usr/lib64/php/modules/ I reinstalled mcrypt with yum install mcrypt and the result I have mcryp.so in /usr

Munin dynamic graph zoom (dynazoom) not working (CentOS6,nginx,php-fpm)

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CentOS 6.3 munin 2.0.17-1 php54 (php-fpm) nginx 1.2.6-1 Setup munin via the 'epel' repo and after tinkering, I got it working with multiple nodes. However the graph zoom did not work on any of the graphs. I ended up switching the *_strategy mode from HTML to cgi per a suggestion I found online - which made it so that none of the graphs are updating (since cgi isn't working) and the zoom is still broken. All of the guides that I can find online (including the official: http://munin-monitoring.org/wiki/CgiHowto2 ) refer to using spawnfcgi (which I used to use on an older CentOS5 server) and

Location of sphinx-build on CentOS

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I have a brand new CentOS 6 box and wanted to install sphinx, in order to compile documents as generated by readthedocs.org i.e. rst files. In a previous ubuntu box I was running make html and that would invoke the sphinx-build command and compile the documentation. I downloaded the latest version of sphinx and installed it as such: sudo wget http://sphinxsearch.com/files/sphinx-2.1.9-1.rhel6.x86_64.rpm sudo localinstall sphinx-2.1.9-1.rhel6.x86_64.rpm Everything seems to be fine but sphinx-build is nowhere to be found. Any pointers are more than appreciated. You are mixing up two different