CentOS 停用Crontab 寄信通知

#crontab -e
在第一行加入MAILTO=""

CentOS 修改預設啟動模式

#vi /etc/inittab

改成

id:3:initdefault:

HTML 常用的META

語系

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Content-Language" content="zh-TW" />

<meta http-equiv="Content-Language" content="en" />

<meta http-equiv="Content-Language" content="ja" />

適用於FB分享

<meta property="og:site_name" content="/>
<meta property="og:url" content="">
<meta property="og:title" content="">
<meta property="og:description" content="">

https://developers.facebook.com/docs/opengraphprotocol/

CentOS 6 安裝 MRTG

#安裝基本套件

yum -y install perl gd libpng zlib mrtg httpd net-snmp net-snmp-utils

#設定與啟動 SNMP
vim /etc/snmp/snmpd.conf
#增加下列兩行
view systemview included .1.3.6.1.2.1.2.2.1.10
view systemview included .1.3.6.1.2.1.2.2.1.16

啟動 SNMP
$service snmpd restart

設定開機啟動
#chkconfig snmpd on

#設定 MRTG
vi /etc/mrtg/mrtg.cfg

#增加以下數行
Language: big5
Target[eth0]: 2:public@127.0.0.1
MaxBytes[eth0]: 1250000
Title[eth0]: Traffic Analysis
PageTop[eth0]: <H1>127.0.0.1 eth0</H1>

#產生基本網頁
#執行 3 次下面指令, 產生基本網頁
env LANG=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg
env LANG=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg
env LANG=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg

#產生 MRTG 首頁
indexmaker /etc/mrtg/mrtg.cfg > /var/www/mrtg/index.html

#設定排程
crontab -e
*/5 * * * * root env LANG=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg

#開放其他機器查詢MRTG&調整編碼

vi /etc/httpd/conf.d/mrtg.conf

#原參數
Alias /mrtg /var/www/mrtg
<Location /mrtg>
Order deny,allow
Deny from all
Allow from 127.0.0.1
Allow from ::1
# Allow from .example.com
</Location>

#增加允許瀏覽的主機或網段
Alias /mrtg /var/www/mrtg
<Location /mrtg>
# Order deny,allow
# Deny from all
AddDefaultCharset big5
Allow from 192.168.0.0/255.255.255.0
Allow from 127.0.0.1
Allow from ::1
# Allow from .example.com
</Location>



--

官方網頁
http://oss.oetiker.ch/mrtg/doc/mrtg-unix-guide.en.html

CentOS MySQL 調整

1、複製my-large.cnf文件到/etc/my.cnf cp /usr/share/doc/mysql-server-5.1.61/my-large.cnf /etc/my.cnf 2、打開my.cnf修改編碼 vi /etc/my.cnf

[client]

character-set-server = utf8

[mysql]

character-set-server = utf8

[mysqld]

init_connect='SET collation_connection = utf8_unicode_ci' 
init_connect='SET NAMES utf8' 
character-set-server=utf8 
collation-server=utf8_unicode_ci 
skip-character-set-client-handshake

3、重啟MySQL服務 service mysqld restart 4、登錄mysql看看修改成功否 show variables like 'character%'; 5.更新密碼

UPDATE mysql.user SET Password=PASSWORD('MyNewPass') WHERE User='root';
FLUSH PRIVILEGES;

CentOS 啟用memcached

#yum install -y memcached php5-memcache

#vi /etc/php.ini

session.save_handler = files
修改成
session.save_handler = memcache
session.save_path="tcp://127.0.0.1:11211?persistent=1&weight=1&timeout=1&retry_interval=15"

#vi /etc/sysconfig/memcached

PORT="11211"
USER="memcached"
MAXCONN="1024"
CACHESIZE="512"
OPTIONS=""

#service memcached restart
#service httpd restart

查看狀態
memcached-tool 127.0.0.1:11211 stats
memcached-tool 127.0.0.1:11211 display
memcached-tool 127.0.0.1:11211 dump

設定開機啟用

chkconfig memcached on

可以解決session 檔案過多，造成效能下降的狀況

CentOS 改中文語系

/etc/sysconfig/i18n

修改成下面設定

原LANG="en_US.UTF8"
改為LANG="zh_TW.UTF8"