Posts

Differences of network bridge and gateway. from https://www.geeksforgeeks.org/difference-between-bridge-and-gateway/ Bridge is a network device which works in data link lay…

Post big data, get 503 server error from site. Check nginx/error.log, appears next content: [crit] 16852#0: *1 open() "/var/lib/nginx/tmp/client_body/0000000001" failed (13: Perm…

from Advanced Bash-Scripting Guide: http://tldp.org/LDP/abs/html/x23170.html Sed Sed is a non-interactive [1] stream editor. It receives text input, whether from stdin or from …

How to configure rsyslog Some records of resent works. The point is to test rsyslog's file size limit and log format. 1. Create log format: Next is to add a new template about …

In shell scripts, symbols are very usefull to handle strings in variables. Next list some frequently used methods of getting specified strings from variables. ${var##*str}  …

Records of commanly used svn commands. 1. Create SVN server: a. Install package. yum install subversion b. Create directory: mkdir /var/svn c. Create repository: svnadmin c…

Original site: http://blog.redbranch.net/2015/07/30/centos-7-as-nat-gateway-for-private-network/ The scenario is a small private network connected via a switch and using 192…

When we are doing some tests on linux that take very long time, and we have to monitor its status at every moment, in this case, we can set the mail client on linux, to inform tes…

Mark my first little spider about scrapy. Motivation: Recent days, I was busy with  testing the VMServer 4.3 (a virtualization software of PUHUA). The beta2 version is just…

Original link: https://stackoverflow.com/questions/231767/what-does-the-yield-keyword-do   To understand what yield does, you must understand what gener…