四個字 堅持到底

稍微調幾樣..
kern.ipc.somaxconn=1024

The kern.ipc.somaxconn sysctl variable limits the size of the listen queue for accepting new TCP connections. The default value of 128 is typically too low for robust handling of new connections in a heavily loaded web server environment. For such environments, it is recommended to increase this value to 1024 or higher. The service daemon may itself limit the listen queue size (e.g. sendmail(8), or Apache) but will often have a directive in its configuration file to adjust the queue size. Large listen queues also do a better job of avoiding Denial of Service (DoSDoSDoSDoSDoS) attacks.

＃禁止看到對方
security.bsd.see_other_uids=0
＃防止Dos
net.inet.tcp.blackhole=2
net.inet.udp.blackhole=1　

1. 看CPU
 #psrinfo -v  
 #psrinfo | grep on-line | wc -l 
 # /usr/platform/`uname -i`/sbin/prtdiag -v 
 # /usr/platform/`uname -m`/sbin/prtdiag -v  

用tcpdump工具去看
tcpdump -n -e -ttt -r /var/log/pflog
顯示table內容
pfctl -t sshguard -T show
PF中文手冊
http://www.freebsdchina.org/forum/topic_24641.html

要增加apche效能可以用mod_cache

httpd.conf加入

# Sample Cache Configuration
#
LoadModule cache_module modules/mod_cache.so
<IfModule mod_cache.c>
#LoadModule disk_cache_module modules/mod_disk_cache.so
<IfModule mod_disk_cache.c>
CacheRoot c:/cacheroot
CacheSize 256
CacheEnable disk /
CacheDirLevels 5
CacheDirLength 3
</IfModule>
LoadModule mem_cache_module modules/mod_mem_cache.so
<IfModule mod_mem_cache.c>
CacheEnable mem /
MCacheSize 4096
MCacheMaxObjectCount 100
MCacheMinObjectSize 1
MCacheMaxObjectSize 2048
</IfModule>
</IfModule>

mod_mem_cache沒看到這個module,據說沒實作..
詳細中文解釋
其他調校介紹:
http://linuxgazette.net/123/vishnu.html
http://httpd.apache.org/docs/2.0/misc/perf-tuning.html

首先..
cp /usr/local/share/mysql/my-medium.cnf /etc/my.cnf
如果mysql只開放本機使用的話,在/etc/my.cnf加入
[mysqld]
[...]
bind-address=127.0.0.1
讓mysql只監聽lookback介面

裝這個mod_evasive20
apache20:
httpd.conf加入
LoadModule evasive20_module   libexec/apache2/mod_evasive20.so
<IfModule mod_evasive20.c>

 寫的很詳細,有了基礎認識
http://isv.sun.com.cn/techdocs/20060714ten_reasones_to_use_zfs.html

swap不夠用時,freebsd可以讓你創一個新空間來做swap,作法很簡單~

用dd創一個檔案,例如需要100m,bs,count請看dd(1)
#dd if=/dev/zero of=/usr/swap0 bs=1024k count=100
# chmod 0600 /usr/swap0

solaris上也可跟bsd一樣新增swap空間,作法如下

看目前使用中的swap的空間
#swap -l
看swap空間使用狀況

perlvar

方便以後查詢