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Increasing the maximum number of TCP/IP connections in Linux
... decrease the tcp_fin_timeout
To find out the default values:
sysctl net.ipv4.ip_local_port_range
sysctl net.ipv4.tcp_fin_timeout
The ephermal port range defines the maximum number of outbound sockets a host can create from a particular I.P. address. The fin_timeout defines the minimum time thes...
Best way to simulate “group by” from bash?
Suppose you have a file that contains IP addresses, one address in each line:
14 Answers
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Enable remote MySQL connection: ERROR 1045 (28000): Access denied for user
...
You have to put this as root:
GRANT ALL PRIVILEGES ON *.* TO 'USERNAME'@'IP' IDENTIFIED BY 'PASSWORD' with grant option;
;
where IP is the IP you want to allow access, USERNAME is the user you use to connect, and PASSWORD is the relevant password.
If you want to allow access from any IP just p...
How can I programmatically get the MAC address of an iphone
How to programmatically get an iPhone's MAC address and IP address?
12 Answers
12
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提升大数据分析思想，拥抱大数据未来 - 资讯 - 清泛网 - 专注C/C++及内核技术
...起的革命性数据科学当中，最令人感到兴奋的莫过于能够实时掌握消费者和物联网的动态，但是，这恐怕容易使得企业陷于另一种困境。
日本信息通信技术（ICT）企业美国公司首席信息官尼尔·贾维斯（Neil Jarvis）表示：“企业...
程序员用数据思维教你如何追女生 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...们所有的记录都是可以追溯的。
所以利用网络云笔记，实时保存每一次约会的记录，让我们的约会变得有技术保障！
江湖上那些印个回忆录相册什么的小伎俩，在我们这根本不是事儿，我们一键导出就可以了。
记录下来，...
Heroku/GoDaddy: send naked domain to www [closed]
...completely free. You just point your A record for the naked domain to that IP address and it will redirect the browser to the www domain. You don't even need an account with them.
– P O'Conbhui
May 4 '13 at 0:48
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What is the difference between 127.0.0.1 and localhost
...27.0.0.1, then (intelligent) software will just turn that directly into an IP address and use it. Some implementations of gethostbyname will detect the dotted format (and presumably the equivalent IPv6 format) and not do a lookup at all.
Otherwise, the name has to be resolved. And there's no guaran...
ssh: Could not resolve hostname [hostname]: nodename nor servname provided, or not known
...I had already:
installed and tested ssh on my home network.
Set a static IP for my pi.
Set up a Dynamic DNS service and installed the software on my pi.
I referenced these instructions for setting up the static ip, and there are many more instructional resources out there.
Also, I set up port f...
java.net.ConnectException: Connection refused
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This exception means that there is no service listening on the IP/port you are trying to connect to:
You are trying to connect to the wrong IP/Host or port.
You have not started your server.
Your server is not listening for connections.
On Windows servers, the listen backlog queue is f...