Graphical Network Simulator (GNS3) 是一個網絡設備模擬器軟件,主要模擬 Cisco 的 Router、Switch 和 Firewall,對學習 Network 的朋友們確實是超大的喜訊,尤其是正在攻略 Cisco 考試的朋友們。筆者聽說過在沒有 GNS3 的年代,曾經有師兄為了學習 CCIE Lab,就花了十萬港元去購買一隻 Cisco 4503!現在我們真是很幸福了!
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Graphical Network Simulator (GNS3) 是一個網絡設備模擬器軟件,主要模擬 Cisco 的 Router、Switch 和 Firewall,對學習 Network 的朋友們確實是超大的喜訊,尤其是正在攻略 Cisco 考試的朋友們。筆者聽說過在沒有 GNS3 的年代,曾經有師兄為了學習 CCIE Lab,就花了十萬港元去購買一隻 Cisco 4503!現在我們真是很幸福了!
How to change visudo editor from nano to vim?
Type sudo update-alternatives --config editor
You will get a text like below.
There are 4 choices for the alternative editor (providing /usr/bin/editor).
Selection Path Priority Status
------------------------------------------------------------
* 0 /bin/nano 40 auto mode
1 /bin/ed -100 manual mode
2 /bin/nano 40 manual mode
3 /usr/bin/vim.basic 30 manual mode
4 /usr/bin/vim.tiny 10 manual mode
Press enter to keep the current choice[*], or type selection number: 3
Find vim.basic
or vim.tiny
selection number. Type it and press enter. Next time when you open visudo
your editor will be vim
Linux 应急响应总结
前言(扯犊子):做为一名在前线的信息安全从业人员,应急响应技术是必不可缺的,在常见的安全保障模型P2DR模型中,response(响应)占据了其中重要的一个环节。
Source: Linux 应急响应总结
[Windows Server 2008] 修改遠端桌面 Port 3389 為 RDP 3392 Port @ 香腸炒章魚 :: 痞客邦 PIXNET ::
微軟於 2012 年發佈 3月份的資訊安全公告 MS12-020 重大安全風險,後不到二十四小時,網路上已經流傳針對 MS12-020 弱點的攻擊程式,攻擊程式會先對 3389 TCP 通訊埠傳送攻
Source: [Windows Server 2008] 修改遠端桌面 Port 3389 為 RDP 3392 Port @ 香腸炒章魚 :: 痞客邦 PIXNET ::
Need Help: L2TP Client Interface with shared secret key
安裝 Ubuntu Server 的一些初始網路設定 | Asika Lab 飛鳥實驗室
平時太習慣 VPS 設定好的環境,剛安裝完單機版 Ununtu 之後就是連不上網路,不過內網連的好好的。希望將主機當成伺服器的使用者需要記得先做幾項設定,讓網路暢通。 設定靜態 IP 輸入以下指令編輯網路設定: $ sudo vim /etc/network/interface 改成如下設定 # This file describes the network interfaces av
【筆記整理】Iptables網路連線限制及攻擊防護和相關設定 | ghoseliang – 點部落
摘要:【筆記整理】Iptables網路連線限制及攻擊防護和相關設定
[工具介紹] 利用 iptables 的敲門機制保護 ssh 服務
http://cyrilwang.blogspot.tw/2012/11/iptables-ssh.html
SPINE: Poller[0] ERROR: Spine Timed Out While Processing Hosts Internal
http://blog.pnyet.web.id/2013/01/07/solved-error-spine-timed-out-while-processing-hosts-internal.html
[Solved] SPINE: Poller[0] ERROR: Spine Timed Out While Processing Hosts Internal
Few days ago I’ve a problem when installing cacti 0.8.8a, and only 3 devices that successfully graphed. My cacti running on CentOS 6.3 x86_64 with core i7 and 8GB ram, 240GB SSD and will used for populate about 3000 – 3500 data sources. First time I ran the cacti and everything work fine and I can add about 4 graphs on two devices and the graph is normal.
The problem come after generate about 300 graphs and the new graph doesn’t show. I got the following error message from cacti.log:
01/02/2013 06:59:06 AM - SPINE: Poller[0] ERROR: Spine Timed Out While Processing Hosts Internal 01/02/2013 06:59:06 AM - SPINE: Poller[0] ERROR: Spine Timed Out While Processing Hosts Internal 01/02/2013 07:00:08 AM - SPINE: Poller[0] ERROR: Spine Timed Out While Processing Hosts Internal 01/02/2013 07:00:08 AM - SPINE: Poller[0] ERROR: Spine Timed Out While Processing Hosts Internal 01/02/2013 07:01:07 AM - SPINE: Poller[0] ERROR: Spine Timed Out While Processing Hosts Internal 01/02/2013 07:01:07 AM - SPINE: Poller[0] ERROR: Spine Timed Out While Processing Hosts Internal 01/02/2013 07:02:08 AM - SPINE: Poller[0] ERROR: Spine Timed Out While Processing Hosts Internal 01/02/2013 07:02:08 AM - SPINE: Poller[0] ERROR: Spine Timed Out While Processing Hosts Internal 01/02/2013 07:03:10 AM - SPINE: Poller[0] ERROR: Spine Timed Out While Processing Hosts Internal 01/02/2013 07:03:10 AM - SPINE: Poller[0] ERROR: Spine Timed Out While Processing Hosts Internal 01/02/2013 07:04:07 AM - SPINE: Poller[0] ERROR: Spine Timed Out While Processing Hosts Internal
After got the error log in above, I did the following steps:
1. Modify PHP execution time limit ini php.ini and change the maximum execution time from 60 second to 180 second
# vi php.ini
max_execution_time = 180
2. Increase script server time out value from 60 second to 180 or above depend on yours, go to cacti console enter to setting menu and then change “Script and Script Server Timeout Value” from 60 to 180 or above.
If two step in above doesn’t work
also try to modify mysql & php config.
How to change max_connections
You can change max_connections
while MySQL is running via SET
:
mysql> SET GLOBAL max_connections = 5000;
Query OK, 0 rows affected (0.00 sec)
mysql> SHOW VARIABLES LIKE "max_connections";
+-----------------+-------+
| Variable_name | Value |
+-----------------+-------+
| max_connections | 5000 |
+-----------------+-------+
1 row in set (0.00 sec)