經驗交流分享與備忘

在Linux桌面需要輸入中文卻沒有中文輸入法的時候是很頭痛的事情
這邊分享如何安裝中文輸入法？

在Linux中用xl2tpd建立L2TP协议的VPN连接需要两个配置文件，一个是给xl2tpd的配置文件，一个是给pppd的配置文件（xl2tpd会调用pppd）。
    为说明方便，我们假设我们要建立的VPN连接的名字为testvpn，连到的l2tp服务器地址为xxx.xxx.xxx.xxx，用户名为someone，密码为passwordstring。那么该xl2tpd的配置文件应该如下所示：

To configure passive mode for vsftpd you need to set some parameters in vsftpd.conf.
pasv_enable=Yes
pasv_max_port=10100
pasv_min_port=10090

This enables passive mode and restricts it to using the eleven ports for data connections. This is useful as you need to open these ports on your firewall.
iptables -I INPUT -p tcp --destination-port 10090:10100 -j ACCEPT

If after testing this all works then save the state of your firewall with
service iptables save

which will update the /etc/sysconfig/iptables file.
To do this is CentOS 7 you have to use the new firewalld, not iptables:
Find your zone:
# firewall-cmd --get-active-zones
public
interfaces: eth0

My zone is 'public', so I set my zone to public, add the port range, and after that we reload:
# firewall-cmd --permanent --zone=public --add-port=10090-10100/tcp
# firewall-cmd --reload

What happens when you make a connection

Your client makes a connection to the vsftpd server on port 21.

The sever responds to the client telling it which port to connect to from the range specified above.

The client makes a data connection on the specified port and the session continues.

There is a great explanation of the different ftp modes here.
本文轉貼自 http://serverfault.com/questions/421161/how-to-configure-vsftpd-to-work-with-passive-mode
 

在Ubuntu 13.04系统中（其它版本的也大概是），有个管理应用程序图标的文件夹：/usr/share/applications
在这个文件夹里，包含了ubuntu自带的所有程序的图标，后缀都是.desktop.
默认的ubuntu系统桌面已经有几个应用程序的图标，如果你还想要将其它程序放到这个启动栏里，就直接从/usr/share/applications文件夹里用鼠标拖到启动栏里。

如果不是系统自带的程序呢，比如Eclipse，自己后来安装的。
步骤很简单，首先，当然是在/usr/share/applications中建立一个eclipse.desktop（其它应用程序就是xxx.desktop)
$sudo gedit /usr/share/applicaions/eclipse.desktop
打开编辑框，之后输入下面的图标定义：
[Desktop Entry]
Encoding=UTF-8
Name=Eclipse Platfrom
Comment=Eclipse IDE
Exec=/home/ling/Software/eclipse/eclipse  //这个是你的Eclipse文件夹下eclipse.exe的路径
Icon=/home/ling/Software/eclipse/icon.xpm //Eclipse文件夹下图标icon.xpm的路径
Terminal=false
StartupNotify=true
Type=Application
Categories=Application;Development;

保存退出，在执行命令，将其可执行：
$sudo chmod u+x /usr/share/applicaions/eclipse.desktop
如果你编辑的.desktop文件没有语法错误（出现打错字或者空格，换行不对之类的），当你再打开/usr/share/applicaions时，搜索ecli*，就能看到eclipse图标，名称为“Eclipse Platform"了。
如果要把它放到左侧启动栏，方法就是从这个文件夹拖进去 。


当然，也许你想要把应用程序的图标放到桌面上（不排除有人喜欢windows的桌面），那就把.desktop文件从/usr/share/applicaions拷贝到~/Desktop下，然后它们就一个个的在桌面上了。
 
本文轉貼自 http://blog.csdn.net/myself_way/article/details/17150585
 
 

預設的 FreeBSD 中 ls 是沒有顏色的，這樣對檔案的操作及維護都會有不小的困擾 。 

如果你是系統管理者 
可以修改 /etc/csh.cshrc 來讓系統管理者使用相同的設定 
但是如果你是一般使用者就修改家目錄中的 .cshrc

multicast routing
By default IPv6 multicast routing is disabled, so you have to explicitly configure it in rc.conf.

Currently there are two IPv6 multicast routing daemons available in package or ports (pim6sd = PIM-SM and pim6dd = PIM-DM), but please keep in mind that they are not installed in FreeBSD-RELEASE by default due to its licensing issue.

How do I configure IPv6 networking under FreeBSD 7.x server? How do I assign IPv6 IP address using command line utility?

 

I have a FreeBSD machine running on a virtual machine. I am using SUN Virtual Box. I need to set static IP address to this machine. So that I can access this machine. Is there anyway to do this ?

in /etc/rc.conf:
ifconfig_em0="inet 192.168.0.254 netmask 255.255.255.0"
defaultrouter="192.168.0.1"

命令形的 wireshark，有同 tcpdump
man tshark
捕包樹狀解析

You probably know the situation: You love FreeBSD, you love ZFS as a filesystem (maybe even as the root filesystem?), but when it comes to virtualisation, FreeBSD users don't have a lot of choice.
That said, VirtualBox, which runs on quite a few platforms and is free, does perform rather well and offers many features, which most people aren't aware of: iSCSI support, Teleporting (aka live migration, even cross-platform), Virtio Net support, Ballooning, built-in solid VNC support (better than Xen's!), highly configurable device support (from disk controller types over chipsets and NICs).