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How to test an Internet connection with bash?
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tcping would also be of help here. ( tcping www.yahoo.com 80 ) && echo "Site is up"
– David Ramirez
Aug 7 '15 at 15:14
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搭建高可用mongodb集群（三）—— 深入副本集内部机制 - 大数据 & AI - 清...
...的4个。。。
心跳 综上所述，整个集群需要保持一定的通信才能知道哪些节点活着哪些节点挂掉。mongodb节点会向副本集中的其他节点每两秒就会发送一次pings包，如果其他节点在10秒钟之内没有返回就标示为不能访问。每个节...
【内核源码】linux UDP实现 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...接调用的操作。udp_prot是底层协议的处理。可以看到相比TCP，UDP不用accept(),lis 创建udp socket
在socket()创建的时候，会设置对应协议的操作集。 inet_dgram_ops是系统调用层直接调用的操作。udp_prot是底层协议的处理。
可以看到相比T...
Vagrant's port forwarding not working [closed]
... -L -v
Then flush current rules:
iptables -F
Allow SSH connections on tcp port 22
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
Set default policies for INPUT, FORWARD and OUTPUT chains
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT ACCEPT
Set access for localhost
ip...
Several ports (8005, 8080, 8009) required by Tomcat Server at localhost are already in use
...OFF NODE NAME
java 21347 krunal 52u IPv6 XXX 0t0 TCP *:http-xxx (LISTEN)
and kill it: (kill -9 21347)
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docker error: /var/run/docker.sock: no such file or directory
...rt DOCKER_CERT_PATH=
export DOCKER_TLS_VERIFY=1
export DOCKER_HOST=tcp://:2376
After setting these environment variables I was able to run the build without the problem.
Update [2016-04-28] If you are using a the recent versions of docker you can do
eval $(docker-machine env) will set t...
WCF vs ASP.NET Web API [closed]
...elow you should go for WCF:
If you need to send data on protocols like TCP, MSMQ or MIME
If the consuming client just knows how to consume SOAP messages
WEB API is a framework for developing RESTful/HTTP services.
There are so many clients that do not understand SOAP like Browsers, HTML5, i...
Does Android support near real time push notification?
...act of an XMPP solution:
The Android client must maintain a persistent TCP connection by waking up periodically
to send a heartbeat to the XMPP server.
This clearly imposes a cost in terms of power usage. An estimate of this cost is
provided below:
Using a 1400mAh battery (as suppl...
Android mock location on device?
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You can use adb forward tcp:6000 tcp:23 to forwward port 6000 on your machine to port 23 on the device but I wasn't able to connect even if the port is shown as open. Using a telnet client on the device and connecting to localhost also fails
...
Most useful NLog configurations [closed]
...default-wrapper>
<target name="n1" xsi:type="Network" address="tcp://localhost:4001"/>
<target name="n2" xsi:type="Network" address="tcp://localhost:4002"/>
<target name="n3" xsi:type="Network" address="tcp://localhost:4003"/>
</targets>
</nlog&g...