近來試一試 openSUSE 去SETUP 一台 WEB SERVER. 因為要放上data center, 所以要set SSH connect 去server.

1. Generate SSH Key
$ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/chowky/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/chowky/.ssh/id_rsa.
Your public key has been saved in /home/chowky/.ssh/id_rsa.pub.
The key fingerprint is:
XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX chowky@linux

2. check the files generated
$ ls /home/chowky/.ssh
id_rsa id_rsa.pub

Note: id_rsa is private key. 你要keep 這個file. copy to USB drive
id_rsa.pub is public key

3. import the key to the .ssh folder. 找不到的話就自己 create 一個.
$ cd /home/chowky/.ssh
$ cat id_rsa.pub >> /home/chowky/.ssh/authorized_keys

4. Modify “/etc/ssh/sshd_config” …(只識用nano…vi 不太熟…). 修改以下value.
RSAAuthentication yes
PubkeyAuthentication yes

disable password security，因為改用了RSA Keypair Authentication.
ChallengeResponseAuthentication no
PasswordAuthentication no
UsePAM yes

Reload the server configuration:
$ sudo /etc/init.d/sshd force-reload

如果你用 ssh connect 的話 (linux or install cygwin in windows only)
copy private key “id_rsa” file to the client machine.
$ mkdir /home/user/.ssh
$ cp /YOUR_ID_RSA_PATH/id_rsa /home/user/.ssh
$ chmod 0600 -R /home/user/.ssh

你可以用以下的command connect to the server
$ ssh chowky@YOUR_IP_ADDRESS
Enter passphrase for key ‘/home/chowky/.ssh/id_rsa’:

如果又不想 install cygwin 的話都可以用PUTTY…

1. downlaod putty
2. download puttygen
3. Puttygen. Click Load. 之後打passphrase of the key.

4. Save private key.
5. Putty 之後就可以用這個.ppk 的private key connect.

大家可以試下 記得是 openSUSE 10 以下才會成功….

openSUSE 11 就會失…失敗了 (permission denied)..搞了 chowky 很多時間…

其實是有點CONFIG 改了…..
大家改一改server 之前改過的 /etc/ssh/sshd_config

AuthorizedKeysFile .ssh/authorized_keys
-to-
AuthorizedKeysFile %h/.ssh/authorized_keys

之後再 Reload the server configuration:
$ sudo /etc/init.d/sshd force-reload

完成!~

Public key authentication is not working anymore

Version: 11.3+The following applies starting from openSUSE 11.3.
Since openSSH 5.4, relative paths in configuration are no longer allowed. When pointing to the authorized _keys file make sure you use %h/ in front of the path to your authorized_keys file. Older versions still can do without. In /etc/ssh/sshd_config change:

AuthorizedKeysFile .ssh/authorized_keys
-to-
AuthorizedKeysFile %h/.ssh/authorized_keys

這對SET server 的朋友應該會有用~
Reference: http://en.opensuse.org/SDB:OpenSSH_public_key_authentication#Security

當然，只用 linux 的用家是少數，所以投放的資源都會比較少。簡單來說就會是慢一點呢～。

不過這個消息對linux developer 來說當然是好的啦。雖然講就是cross platform，不過都難保不同還有 bugs 會令致某些function 出錯，所以直接在deploy 的environment 作開發才是最佳的選擇。

Flex Builder for Linux 將會在12 December expire. 大家可以在

這裏下載新的alpha 5 build

Source: http://www.ashorten.com/2009/11/25/updated-build-of-flex-builder-for-linux-available/

很奇怪，os　都可以lightweight，（暫時難以明白呢，難道又run　on　browser？），

Google Chrome OS is an open source, lightweight operating system that will initially be targeted at netbooks. Later this year we will open-source its code, and netbooks running Google Chrome OS will be available for consumers in the second half of 2010.

（先不要急，慢慢看完再想）

哦，原來都是來自linux　kernal，google　打算extend　google　chrome　去變得native　only，（把原有的google　chrome　加好多plugin　入去）

簡單來講都是利用web　technology。

Google Chrome OS will run on both x86 as well as ARM chips and we are working with multiple OEMs to bring a number of netbooks to market next year. The software architecture is simple — Google Chrome running within a new windowing system on top of a Linux kernel. For application developers, the web is the platform. All web-based applications will automatically work and new applications can be written using your favorite web technologies. And of course, these apps will run not only on Google Chrome OS, but on any standards-based browser on Windows, Mac and Linux thereby giving developers the largest user base of any platform.

Google 當下的目的很明顯，就是想target　netbook　這個新冒起的market

Source: http://googleblog.blogspot.com/2009/07/introducing-google-chrome-os.html

經濟差，影響了m$ window 的銷路。相反地，opensource 的 linux position growth stronger in data centre。

Sixty-five percent of the 330 respondents said they plan to increase Linux server workloads by 10% or more this year. Sixty-three percent said they will increase their use of Linux on the desktop by more than 10% this year

Linux 的marketshare 首次過10%的大關。看來m$ 要多做一點才可以了。

Source: http://www.informationweek.com/news/software/linux/showArticle.jhtml?articleID=215900055