猫言猫语

安装Google perftools出现错误

Cat. — Fri, 21 Oct 2011 17:55:10 +0000

刚刚在64位的centos系统安装Google perftools时,出现下面错误

error Cannot calculate stack trace: need either libunwind or frame-pointers

解决方法是在编译参数里增加

--enable-frame-pointers

随机日志

centos下添加多个IP地址的方法

Cat. — Fri, 21 Oct 2011 16:37:35 +0000

操作如下，登陆SSH:

vi /etc/syscionfig/network-scripts/ifcfg-eth0:0

第二个IP,就是

vi /etc/syscionfig/network-scripts/ifcfg-eth0:1

第三个IP,就是
ifcfg-eth0:2(由此类推)

DEVICE=eth0:0 网卡设备名称
onboot=YES 随机启动
BOOTPROTO=static 静态分配IP
IPADDR=*.*.*.* 要添加的IP地址
NETMASK=255.255.255.0 子网掩码（以实际为准）
GATEWAY=*.*.*.* 路由

如果IP是连续的，可以使用下面的方法。

vi /etc/sysconfig/network-scripts/ifcfg-eth0-range
DEVICE=eth0
BOOTPROTO=static
IPADDR_START=起始IP
IPADDR_END=结束IP
CLONENUM_START=网卡起始编号
NETMASK=子网掩码
ONBOOT=yes

保存文件然后重启网络服务立即生效

/etc/init.d/network restart

centos add IP addresses

暧味日志

Centos 5.6 yum 安装 openssl 出错

Cat. — Wed, 17 Aug 2011 11:53:05 +0000

Centos 5.6连这样的错误都有!!!!

Transaction Check Error:
package openssl-0.9.8e-12.el5_5.7.i686 is already installed
file /lib/.libcrypto.so.0.9.8e.hmac from install of openssl-0.9.8e-12.el5_5.7.i686 conflicts with file from package openssl-0.9.8e-12.el5_5.7.i386
file /lib/.libssl.so.0.9.8e.hmac from install of openssl-0.9.8e-12.el5_5.7.i686 conflicts with file from package openssl-0.9.8e-12.el5_5.7.i386
file /lib/libcrypto.so.0.9.8e from install of openssl-0.9.8e-12.el5_5.7.i686 conflicts with file from package openssl-0.9.8e-12.el5_5.7.i386
file /lib/libssl.so.0.9.8e from install of openssl-0.9.8e-12.el5_5.7.i686 conflicts with file from package openssl-0.9.8e-12.el5_5.7.i386
file /usr/bin/openssl from install of openssl-0.9.8e-12.el5_5.7.i686 conflicts with file from package openssl-0.9.8e-12.el5_5.7.i386
file /usr/lib/openssl/engines/lib4758cca.so from install of openssl-0.9.8e-12.el5_5.7.i686 conflicts with file from package openssl-0.9.8e-12.el5_5.7.i386
file /usr/lib/openssl/engines/libaep.so from install of openssl-0.9.8e-12.el5_5.7.i686 conflicts with file from package openssl-0.9.8e-12.el5_5.7.i386
file /usr/lib/openssl/engines/libatalla.so from install of openssl-0.9.8e-12.el5_5.7.i686 conflicts with file from package openssl-0.9.8e-12.el5_5.7.i386
file /usr/lib/openssl/engines/libchil.so from install of openssl-0.9.8e-12.el5_5.7.i686 conflicts with file from package openssl-0.9.8e-12.el5_5.7.i386
file /usr/lib/openssl/engines/libcswift.so from install of openssl-0.9.8e-12.el5_5.7.i686 conflicts with file from package openssl-0.9.8e-12.el5_5.7.i386
file /usr/lib/openssl/engines/libgmp.so from install of openssl-0.9.8e-12.el5_5.7.i686 conflicts with file from package openssl-0.9.8e-12.el5_5.7.i386
file /usr/lib/openssl/engines/libnuron.so from install of openssl-0.9.8e-12.el5_5.7.i686 conflicts with file from package openssl-0.9.8e-12.el5_5.7.i386
file /usr/lib/openssl/engines/libsureware.so from install of openssl-0.9.8e-12.el5_5.7.i686 conflicts with file from package openssl-0.9.8e-12.el5_5.7.i386
file /usr/lib/openssl/engines/libubsec.so from install of openssl-0.9.8e-12.el5_5.7.i686 conflicts with file from package openssl-0.9.8e-12.el5_5.7.i386

解决方法很简单:

rpm -e --justdb --nodeps openssl.i386
yum install openssl

随机日志

Linux命令tar压缩排除指定目录的方法

Cat. — Thu, 11 Aug 2011 06:04:17 +0000

例如我要压缩 /cat/backup 这个文件夹 (绝对路径),但是不将里面的图片文件夹img也压缩了.可以用tar命令的--exclude 排除掉.方法

tar -zcvf backup.tar.gz --exclude=/cat/backup/img /cat/backup

排除多个目录

tar -zcvf backup.tar.gz --exclude=/cat/backup/img --exclude=/cat/backup/a --exclude=/cat/backup/b /cat/backup

暧味日志

iptables限制同一IP连接数

Cat. — Thu, 31 Mar 2011 07:49:35 +0000

最近无聊人太多了,一直拿我的小博客来压力测试,所以不得不限制同一个IP的连接数,用iptables就可以简单设置了...

iptables -I INPUT -p tcp --dport 80 -m connlimit --connlimit-above 10 -j DROP

限制单个地址并发连接数不大于10

暧味日志

WordPress在Nginx中启用Apache的mod_rewrite

Cat. — Thu, 24 Feb 2011 04:48:30 +0000

其实不是真的可以另到 Nginx 支持 Apache 的 mod_rewrite 的.因为如果你的web服务器是 Nginx ,那么你的 WordPress 就会提示你的服务器环境不支持 mod_rewrite 了,但实际上是支持的,例如安装了 WP Super Cache 这插件就有这样的提示了,现在我们只要添加一行代码就可以关闭这个提示,欺骗WordPress ,让它认为是支持 mod_rewrite 方法是在主题的 functions.php 文件添加下面的代码:

add_filter('got_rewrite', 'nginx_has_rewrites');
function nginx_has_rewrites() {
return true;
}

另外,因为Nginx运行PHP是用PHP-FPM的,所以有时会导致WordPress认为php没有写权限,表现为无法自动升级,和升级插件等,下面这个代码可以修改这个错误.

add_filter('filesystem_method', 'nginx_make_filesystem_direct');
function nginx_make_filesystem_direct() {
return 'direct';
}

暧味日志

关闭 WordPress 3.1 的管理工具条

Cat. — Thu, 24 Feb 2011 04:33:40 +0000

升级到 WordPress 3.1 ,感觉没有什么两样,唯一无法忍受的就是它的管理工具条.所以要干掉它.方法是在后台用户资料哪里选择隐藏它就OK了.

或者在主题的functions.php文件添加一行代码:

add_filter( 'show_admin_bar', '__return_false' );

这样那个管理工具条就消失了..

暧味日志

Linux下替换文件名中的空格

Cat. — Mon, 21 Feb 2011 03:16:01 +0000

find . -type f -name "* *" -print |
while read name; do
na=$(echo $name | tr ' ' '_')
if [[ $name != $na ]]; then
mv "$name" $na
fi
done

暧味日志

利用功夫网来防止来自中国的DDOS攻击

Cat. — Mon, 08 Nov 2010 02:36:43 +0000

功夫网终于有贡献了..
不过可能会有副作用,就是连自己的网站都给功夫网封了...
下面是php代码..

if(strpos($_SERVER['REQUEST_URI'],'minghui') === false) {
header('Location:'. $_SERVER['REQUEST_URI'] . '?minghui');
exit;
}
?>

演示:http://vii.im/gfw-test.php

随机日志

简单配置Nginx前端处理静态文件,LiteSpeed后端处理动态文件

Cat. — Sun, 31 Oct 2010 14:47:01 +0000

因为我用的LiteSpeed是免费版,连接数只有150的限制,虽然这150的链接也能应付日IP1W的 WordPress 的博客 ,但是网站的流量慢慢增加,不得不提准备,用Nginx 来跑静态文件,减少一些连接请求,何况用Nginx前端的话,负载能力都高点,速度应该也快点吧,所以,我又折腾起来了,然后做个简单记录,防止以后忘记啊,这个就不算什么教程了.
第一步,当然是安装LiteSpeed啦,请看这里:http://imcat.in/litespeed-mysql-php-install/

然后就是安装Nginx了

wget -c http://catlnmp.googlecode.com/files/pcre-8.01.tar.gz
tar zxvf pcre-8.01.tar.gz
cd pcre-8.01/
./configure
make && make install
cd ../

wget -c http://nginx.org/download/nginx-0.8.53.tar.gz
tar zxvf nginx-0.8.53.tar.gz
cd nginx-0.8.53/
./configure --user=www --group=www --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module --with-http_gzip_static_module
make && make install
cd ../

接着就是关键了,建立一个放网站配置文件的目录和创建配置文件:

mkdir -p /usr/local/nginx/conf/servers
rm -rf /usr/local/nginx/conf/nginx.conf
vi /usr/local/nginx/conf/nginx.conf

内容为:

user www www;
worker_processes 1;
error_log /usr/local/nginx/logs/nginx_error.log crit;
pid /usr/local/nginx/nginx.pid;
#Specifies the value for maximum file descriptors that can be opened by this process.
worker_rlimit_nofile 1024;
events
{
use epoll;
worker_connections 1024;
}
http
{
include mime.types;
default_type application/octet-stream;
#charse gb2312;
server_names_hash_bucket_size 128;
client_header_buffer_size 128k;
large_client_header_buffers 4 256k;
client_max_body_size 16m;
sendfile on;
tcp_nopush on;
keepalive_timeout 60;
tcp_nodelay on;

gzip on;
gzip_min_length 1k;
gzip_buffers 4 16k;
gzip_http_version 1.1;
gzip_comp_level 9;
gzip_types text/plain application/x-javascript text/css application/xml;
gzip_vary on;
output_buffers 4 32k;
postpone_output 1460;

#limit_zone crawler $binary_remote_addr 10m;
include servers/*;
}

vi /usr/local/nginx/conf/proxy.conf

proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
client_max_body_size 50m;
client_body_buffer_size 256k;
proxy_connect_timeout 30;
proxy_send_timeout 30;
proxy_read_timeout 60;

proxy_buffer_size 4k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;
proxy_next_upstream error timeout invalid_header http_500 http_503 http_404;
proxy_max_temp_file_size 128m;

#Nginx cache
client_body_temp_path client_body 1 2;
proxy_temp_path proxy_temp 1 2;

#client_body_temp_path /tmpfs/client_body_temp 1 2;
#proxy_temp_path /tmpfs/proxy_temp 1 2;
#fastcgi_temp_path /tmpfs/fastcgi_temp 1 2;

最后就是站点配置文件:

vi /usr/local/nginx/conf/servers/imcat.conf

server
{
listen 80;
server_name imcat.in www.imcat.in *.imcat.in;
index index.html index.htm ;
root /home/www/imcat/;
include proxy.conf;

location / {
location ~ .*\.(php|php5)?$ {
index index.php;
root /home/www/imcat/;
proxy_pass http://127.0.0.1:8080; #这里的IP是你的LiteSpeed在Listeners 设置的IP和端口,一定要相同
}

if ( !-e $request_filename) {
proxy_pass http://127.0.0.1:8080; #这里的IP是你的LiteSpeed在Listeners 设置的IP和端口,一定要相同
}

location ~* \.(jpg|jpeg|gif|png|swf|htm|html)$ {
if (-f $request_filename) {
root /home/www/imcat/;
expires 30d;
break;
}
}
location ~* \.(js|css)$ {
if (-f $request_filename) {
root /home/www/imcat/;
expires 1d;
break;
}
}
}

error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}

然后启动Nginx和LiteSpeed就OK了...
所有东西我都是自己Google来的,所以一些错误我还不会解决的,欢迎大家来交流经验啊...