Operations Tool NC

The full name of the NC command, Netcat, reads and writes data from the network via TCP or UDP.

1. Transferring files

Use <> Redirect (single file Only, not recommended, failed ">" to produce empty pieces)

Nc-l 8888 > Demo.txt # Listening for TCP connections on native 8888 ports, writing incoming data to a text file

NC IP 8888 < demo.txt # put the file contents through the network "cat" to the remote

Transferring files using tar (recommended, the benefit is preserving the original directory structure and permissions)

Tar cz demo1.txt demo_dir/| Nc-l 8888 # Listening on 8888 ports, there is a connection when starting tar packaging and "cat" to the remote

NC IP 8888 | Tar ZX # Connect, receive data, unzip one step into place.

2. Establish Network pipeline

NC-L 8888 # Receiving messages

echo MSG | NC IP 8888 # Send Message

3, the transfer of production room data to the test room (operation and maintenance of computer-built pipeline)

Tar cz demo1.txt demo_dir/| Nc-l 8888 # Production Room IPA

Nc-l 8888 | Tar ZX # test Room IPB

NC IpA 8888 | NC IpB 8888 # OPS PC, connecting the 8888 ports of the two machines.

4, test network connectivity (troubleshooting LBG forwarding UDP problem in the test room)

Curl Debugs http, that is, the 7 layer is very efficient. But how do you debug a 4-tier network? The answer is NC.

Test room LBG do a public network UDP service mapping, but test students found that the program error, suspected network problems, find operation and maintenance of students to troubleshoot.

Nc-ul 9999 # service IPS listening 9999 port mapped to public network Ipvs:portvs

NC-ZUV IPs 9999 # Intranet UDP connectivity successfully displayed connection to IpS 9999 port [udp/*] succeeded!

NC-ZUV IpVS Portvs # Public network UDP connectivity failure display connection to IpVS Portvs port [udp/*] fail!

First, on how to check TCP? The above parameter u is removed, the default is TCP.

Second, further write the Nagios plug-in, check the UDP service port (to deploy in the UDP message push monitoring of PP)

5, instead of Telnet, Test MC, clouds and so on.

Echo Stats | NC IpS PORTMC # non-switched view MC status.

echo INFO | NC IpS Portredis # Non-switched view of the status of Redis.

Non-commutative set, get Check Cloud DS # has been deployed to PP for cloud monitoring.

6, the use of NC e-mail, the occurrence of HTTP requests, such as rebound shell, port forwarding, etc., please man NC

Echo-e "get/http/1.0\r\n" | NC uc.cn 80

Operations Tool NC