乐在其中

http段中加入一行：server_tokens off;

php.ini修改expose_php = On到expose_php = Off

源码编译libmemcached-1.0.18时，configure通过，
sudo make出现错误：

make[1]: *** [clients/memflush.o] Error 1

这是libmemcached一个小的bug，解决方法如下：

clients/memflush.cc 中 42，52行的 opt_servers == false 改为 opt_servers == NULL

出现这个问题是因为 Minimal 安装模式 所以并没有安装 setuptool 软件.

解决办法为：

使用yum 源直接下载安装 或者 去下载 setuptool 软件包安装

#安装setuptool

yum install setuptool

#可以发现执行setup后不全，再安装一个用于系统服务管理

yum install ntsysv

#安装setup中配套的防火墙设置

yum install system-config-securitylevel-tui

#安装setup中配套的网络设置

yum install system-config-network-tui

#安装setup中配套的键盘设置

yum install system-config-keyboard

crontab不执行的问题困扰了好长时间，脚本写的都正确，但是就是不执行，最终解决方法如下：
crontab -u root /var/spool/cron/root
这样root用户的crontab就生效了
service crond restart
重启下服务就好了

scp一些大的数据文件，大多时候想挂后台，由于scp要输入密码，所以不能用nuhop，为了安全，也不去配置ssh的公钥等等。

vsftpd遇到了几个错误：

1. 226 transfer done (but failed to open directory)

2. 553 Could not create file.

3. 550 Create directory operation failed.

因为SELINUX=enforcing模式，所以出现以上3个错误，

解决方法：

setsebool -P ftp_home_dir=on #解决错误1

setsebool -P allow_ftpd_full_access=on #解决错误2、3

4. 530 Login incorrect

解决方法：

vim /etc/pam.d/vsftpd

增加2行：

auth sufficient /lib64/security/pam_userdb.so db=/etc/vsftpd/virtusers

account sufficient /lib64/security/pam_userdb.so db=/etc/vsftpd/virtusers

1. 停止MySQL：

/etc/init.d/mysqld stop 或者直接kill掉MySQL的进程

2. 启动MySQL

mysqld_safe –skip-grant-tables &

以上操作完成，重启mysql，就可以用root登录mysql，无需密码验证。

3. MySQL> UPDATE mysql.user SET Password = password(‘new-password’) WHERE User = ‘root’ ;

MySQL> flush privileges ;

MySQL> quit ;

搞定，重启mysql

在RHEL/CentOS中，可以很方便使用setup配置工具配置网络、防火墙、服务等很多关键配置项，使用非常方便，然而采用最小化安装后，默认并没有安装该工具，运行该命令提示如下：

[[email protected] ~]# setup

-bash: setup: command not found

这时就要手动去安装这个快速配置程序了.

[[email protected] ~]# yum install setuptool ntsysv system-config-network system-config-keyboard system-config-network-tui

# yum install setuptool

发现setup命令可以用了,可是系统服务,网络配置,键盘配置,时区配置不见了.安装下这几个配置程序安装系统服务配置

# yum install ntsysv　安装网络配置

# yum install system-config-network　安装键盘时区配置

# yum install system-config-keyboard

system-config-network system-config-keyboard这两个包的依赖很多,能手工改就手动改吧,没特殊应用就不用装了.

当前我用的是APC-3.1.19 stable ，用户自己到 http://pecl.php.net/package/APC 下载最新版。

①安装

wget http://pecl.php.net/get/APC-3.1.19.tgz
tar xzvf APC-3.1.19.tgz
/usr/local/webserver/php/bin/phpize
./configure –enable-apc –enable-apc-mmap –with-php-config=/usr/local/php/bin/php-config –prefix=/usr/local/apc
make && make install

注：安装编译后检查相应目录：

ll /usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/
-rwxr-xr-x 1 root root 416628 12-15 17:13 apc.so

安装成功！

②配置/etc/php.ini

vi /usr/local/php/etc/php.ini

shift+g到最末行，末尾加入

[APC]
extension=”apc.so”
apc.enabled = On
apc.shm_segments = 1
apc.optimization = 0
apc.num_files_hint = 0
apc.ttl = 7200
apc.user_ttl = 7200
apc.cache_by_default = On
apc.slam_defense = 0
apc.file_update_protection = 2
apc.enable_cli = 0
apc.shm_size = 2050M
apc.write_lock = On
apc.stat=0

然后把APC目录下的apc.php复制到可以访问的目录

cp /usr/local/src/APC-3.1.19/apc.php /home/www/htdocs/

③重启Web服务器

所需软件包
libmemcached-1.0.9 https://launchpad.net/libmemcached/1.0/1.0.9/+download/libmemcached-1.0.9.tar.gz
memcached-2.1.0    http://pecl.php.net/get/memcached-2.1.0.tgz （注意上一版本即memcached-2.0.1.tgz 这个包有bug）

系统升级如下：
CentOS release 5.5
CPU = 64-bit, OS = 64-bit
Compiler GNU CC version 4.1.2 20080704 (Red Hat 4.1.2-48)
注意：之前已经安装了libmemcached-1.0.2及php和php的扩展memcached-1.0.2

一、安装libmemcached-1.0.9
[[email protected] packages]# tar zxvf libmemcached-1.0.9.tar.gz
[[email protected] packages]# cd libmemcached-1.0.9
[[email protected] libmemcached-1.0.9]# ./configure –prefix=/usr/local/libmemcached –with-memcached

升级libmemcached从1.0.2升级到1.0.9编译出错如下提示：
make[1]: Entering directory `/packages/libmemcached-1.0.9′
CXX    libhashkit/libhashkit_libhashkit_la-aes.lo
CXX    libhashkit/libhashkit_libhashkit_la-algorithm.lo
CXX    libhashkit/libhashkit_libhashkit_la-behavior.lo
CXX    libhashkit/libhashkit_libhashkit_la-crc32.lo
CXX    libhashkit/libhashkit_libhashkit_la-digest.lo
CXX    libhashkit/libhashkit_libhashkit_la-encrypt.lo
CXX    libhashkit/libhashkit_libhashkit_la-fnv_32.lo
CXX    libhashkit/libhashkit_libhashkit_la-fnv_64.lo
CXX    libhashkit/libhashkit_libhashkit_la-function.lo
CXX    libhashkit/libhashkit_libhashkit_la-has.lo
CXX    libhashkit/libhashkit_libhashkit_la-hashkit.lo
CXX    libhashkit/libhashkit_libhashkit_la-jenkins.lo
CXX    libhashkit/libhashkit_libhashkit_la-ketama.lo
CXX    libhashkit/libhashkit_libhashkit_la-md5.lo
CXX    libhashkit/libhashkit_libhashkit_la-murmur.lo
CXX    libhashkit/libhashkit_libhashkit_la-one_at_a_time.lo
CXX    libhashkit/libhashkit_libhashkit_la-rijndael.lo
CXX    libhashkit/libhashkit_libhashkit_la-str_algorithm.lo
CXX    libhashkit/libhashkit_libhashkit_la-strerror.lo
CXX    libhashkit/libhashkit_libhashkit_la-string.lo
CXX    libhashkit/libhashkit_libhashkit_la-nohsieh.lo
CXXLD  libhashkit/libhashkit.la
CXX    libmemcached/csl/libmemcached_libmemcached_la-context.lo
In file included from ./libmemcached/common.h:72,
from ./libmemcached/csl/common.h:40,
from libmemcached/csl/context.cc:38:
./libmemcached-1.0/memcached.h:46:27: error: tr1/cinttypes: No such file or directory
make[1]: *** [libmemcached/csl/libmemcached_libmemcached_la-context.lo] Error 1
make[1]: Leaving directory `/packages/libmemcached-1.0.9′
make: *** [all] Error 2

处理如下：
[[email protected] libmemcached-1.0.9]# yum install gcc44 gcc44-c++ libstdc++44-devel
[[email protected] libmemcached-1.0.9]# export CC=/usr/bin/gcc44
[[email protected] libmemcached-1.0.9]# export CXX=/usr/bin/g++44
重新编译安装libmemcached-1.0.9
[[email protected] libmemcached-1.0.9]# ./configure –prefix=/usr/local/libmemcached –with-memcached
[[email protected] libmemcached-1.0.9]# make
[[email protected] libmemcached-1.0.9]# make install

二、升级安装php的memcached扩展memcached-2.1.0
[[email protected] packages]# tar zxvf memcached-2.1.0.tgz
[[email protected] packages]# cd memcached-2.1.0
[[email protected] memcached-2.1.0]# /usr/local/php/bin/phpize
[[email protected] memcached-2.1.0]# ./configure –with-php-config=/usr/local/php/bin/php-config –with-libmemcached-dir=/usr/local/libmemcached
[[email protected] memcached-2.1.0]# make
[[email protected] memcached-2.1.0]# make install

重启webserver