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20 Essential Things to Know About the HTML5

The HTML5 specification is the much-discussed, much-anticipated follow-on to HTML4, which has grown a little long in the tooth for the kinds of Web applications developers are creating today and aspire to create in the future. HTML5 will enable a whole new class of Web applications that support multimedia content and offline capability without the need for proprietary plug-in technology.

http://www.eweek.com/c/a/Application-Development/20-Essential-Things-to-Know-About-the-HTML5-Web-Language-329684/

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OpenBSD 4.7 tmux的bug修复了

今天测试了OpenBSD 4.7的snapshot,发现tmux可以使用了。

DESCRIPTION
tmux is a terminal multiplexer: it enables a number of terminals to be
created, accessed, and controlled from a single screen. tmux may be de-
tached from a screen and continue running in the background, then later
reattached.

When tmux is started it creates a new session with a single window and
displays it on screen. A status line at the bottom of the screen shows
information on the current session and is used to enter interactive com-
mands.

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Apache segmentation fault

安装了phpldapadmin后,apache报出了很多seg fault的错误,虽然程序磕磕绊绊的还能运行。

[acheng@henan ~]$ sudo tail -f /var/www/logs/error_log
[Sun Mar 28 21:15:12 2010] [notice] child pid 4112 exit signal Segmentation fault (11)
[Sun Mar 28 21:15:16 2010] [notice] child pid 7268 exit signal Segmentation fault (11)
[Sun Mar 28 21:15:50 2010] [notice] child pid 5508 exit signal Segmentation fault (11)
[Sun Mar 28 21:15:55 2010] [notice] child pid 12292 exit signal Segmentation fault (11)
[Sun Mar 28 21:15:59 2010] [notice] child pid 3828 exit signal Segmentation fault (11)

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OpenBSD上安装配置OpenLDAP

在配置了$PKG_PATH变量的情况下:
#pkg_add -v openldap-server

否则:
#pkg_add -v ftp://ftp.openbsd.org/pub/OpenBSD/4.6/packages/i386/openldap-server-2.3.43.tgz

安装完成后,按照下面的提示配置rc.conf.local和rc.local:

========================================================================
— openldap-server-2.3.43 ——————-
To start slapd, configure it in /etc/openldap/slapd.conf then add
the following line to /etc/rc.conf.local:

slapd_flags=”-u _openldap”

and to /etc/rc.local (be sure to start it _before_ any daemon that may
need it):

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Solaris 10 boot archive issue

今天一台Solaris服务器突然进入维护模式,用户无法通过SSH连接,所有服务停止。
幸好系统已经配置了ILOM,通过ILOM界面reboot系统,重启时提示如下错误:

========================================================
WARNING: add_spec: No major number for
NOTICE: nxge0: xcvr addr:0x1d – link is down
NOTICE: nxge1: xcvr addr:0x1c – link is down
Hostname: solaris10_sparc
VxVM sysboot INFO V-5-2-3409 starting in boot mode…
NOTICE: VxVM vxdmp V-5-0-34 added disk array 04717, datype = TagmaStore-USP

NOTICE: VxVM vxdmp V-5-0-34 added disk array DISKS, datype = Disk

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OpenBSD 4.6 installation demo

OpenBSD 4.6于今年10月中正式发布。和前一版相比,安装过程变得更方便,增加了生成用户,禁用root SSH登录,而且增加了推荐的分区格式,对很多用户来说都是很方便的。以前的手工分区还是有一点复杂的。

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ComixWall 4.6 installation demo

ComixWall是一个基于OpenBSD的ISG(互联网安全网关),也可以说是UTM(同意威胁管理)系统, 它集成了数据包过滤,HTTP/SMTP/POP3代理,IDS和IPS以及VPN等等多项网络安全相关应用。本视频演示ComixWall的安装过程。同时,ComixWall项目于12月8号发表声明,表示项目将于今年年终终止,不在发布新的发行版。所以这次我们演示的4.6也将成为最后一个。但我仍然要说这个系统是值得大家尝试和使用的。

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