Cause:
The company uses the cloud host service of ucloud. This morning, we were suddenly told that the outbound traffic of a server surged, And the outbound packet sending volume reached 1 million in a short time, all of which were UDP-type, the first feeling is: Ah, no, it's not hacked, it's a zombie!
Exploration:
Immediately log on to the corresponding server, first use iftop to view the traffic status
650) This. length = 650; "src =" http://s3.51cto.com/wyfs02/M01/42/73/wKiom1PXewmxnBlAAAIc3
a video of 1.5 hours (5400 seconds) and want to convert the file size to 700 mbThe calculation method is as follows:700 × 8 Gb/s 5400 × 1024 ≈ 1061 kbpsThis means that as long as the Audio Encoding rate is added with the video encoding rate of 700 KB, the size of the file after the conversion of the video in one and a half hours is exactly MB.As for how to set t
, but contains a lot of things, I hope to continue to learn.Learning progress Bar
lines of code (new/cumulative)
Blog Volume (Add/accumulate)
Learning Time (new/cumulative)
Important Growth
Goal
5000 rows
30 Articles
400 hours
First week
0/0
1/1
10/10
Second week
700/700
[DAO] database three paradigm description, dao Database paradigm**************************************** ********************************* *** Original article: blog.csdn.net/clark_xu Xu changliang's column**************************************** ********************************
First paradigm: the general situation is that the column value is unique and there cannot be repeated column values (must comply );
Negative example:
Name contact information (string type)
Xxx 12345; abc@163.com
Xxx bcd
1
.
Install preparation
Basic Environment:Snow leopard10.6.2,Oracle10.2.0.4
OpenRun the following command on the Mac terminal:
Sudo-I
CreateThe oinstall group and oracle users must ensure that the combined user ID does not conflict with the existing system information. Here 700 is used.
Create group:
Dscl.-create/Groups/oinstall
Dscl.-append/Group/oinstall GID 700
Dscl.-append/Groups/oins
at the same time, we cannot tell which situation generates sigio signals, therefore, the message driver in TCP is not suitable for use. On the contrary, it is suitable for use in UDP.
650) This. length = 650; "src =" http://s5.51cto.com/wyfs02/M02/81/FC/wKioL1dGvRWSTO94AAEVwPhhXXo699.png "Title =" .png "width =" 650 "Height =" 253 "border =" 0 "hspace =" 0 "vspace =" 0 "style =" Width: pixel PX; Height: 253px; "alt =" wkiol1dgvrwsto94aaevwphhxxo699.png "/>
Shows the signal-driven working metho
Dede3.1 detailed description of paging text collection and filtering rules (graphic tutorial) This article aims to use a representative text paging sampling rules and filtering rules as a blueprint, through simple change and modification, solve the problem of collecting general text pagination
I. Examples
Sample paging area code:
Sample paging area code:
= 700) window. open ('/upload/20074321296309.gif'); "src =" http://files.jb51.net/upload/200743
to create from scratch .Burn window ComponentsThis is the window component we see in Nero, k3b, or other CD-burning software.#!/usr/bin/python#-*-coding:utf-8-*-"""Zetcode PyQt4 Tutorialin This program, we create a customburning widget.author:Jan Bodnarwebsite:zetcode.comlast EDI Ted:december"""ImportSYS fromPyQt4ImportQtgui, QtcoreclassBurningwidget (qtgui.qwidget):def __init__(self): Super (Burningwidget, self).__init__() Self.initui ()defInitui (self): Self.setminimumsize (1, 30) Self.value=
purpose of catching carp. Sprinkle a big net, caught 700 carp, 200 shrimp, 100 turtle. So, these indicators are as follows:
Correct rate = 700/(700 + 200 + 100) = 70%
Recall rate = 700/1400 = 50%
F value = 70% * 50% * 2/(70% + 50%) = 58.3%
Let's see if all the carp, shrimp and turtles in the pond are clean swe
generated by default, after the key file is generated, the default storage location is/home/hadoop (your user name )/. ssh to view the generated File: ll. the two ssh key pairs add id_rsa.pub to the authorization key: cat id_rsa.pub> authorized_keys to modify authorized_keys permissions, password is still required for SSH) chmod 600 authorized_keys check whether the local machine can be SSH without password logon: ssh localhost OK, the above shows that the local machine logon is successful. The
table:
a = [1, 2, 3]del a
After del a, no reference points to the previously created [1, 2, 3] table. Users cannot access or use this object in any way. This object becomes unhealthy fat if it remains in the memory. When garbage collection is started, Python scans the object with a reference count of 0 and clears the memory occupied by it.However, losing weight is expensive and laborious. During garbage collection, Python cannot perform other tasks. Frequent garbage collection will greatly redu
The accuracy rate, recall rate, and F value are important evaluation indicators of the target in a mixed environment. In this paper, these three indicators are favored.
Let's take a look at the definition of these indicators first:
Accuracy Rate = Total number of correctly recognized individuals/total number of identified individuals
Recall rate = Total number of correctly recognized individuals/total number of individuals in the test set
F value = accuracy * recall rate * 2/(accuracy rate +
The purpose of this paper is to solve the problem of general text paging by simple adaptation and modification based on the sampling rules and filtering rules of a representative text paging.
I. Sample part
Example paging area code:
Example Paging area code:
=700) window.open ('/upload/20074321296309.gif '); "src=" http://www.bkjia.com/uploads/allimg/131016/060F53N3-0.gif "Onload=" if (this.width> ' ") this.width= '"; "border=0>
Sample paging Area
the object position typeThe sixth parameter pivotxvalue the start position of the animation relative to the x-coordinate of the objectThe seventh parameter Pivotxtype for the animation on the y-axis relative to the object position typeThe eighth parameter pivotyvalue the start position of the animation relative to the object's y-coordinateMyanimation_scale =new scaleanimation (0.0f, 1.4f, 0.0f, 1.4f,Animation.relative_to_self, 0.5f, Animation.relative_to_self, 0.5f);③ Setting Animation duration
======================================* OPENSSL======================================1. Install OPENSSL and confirm the location of the openssl. cnf file.$ Yum install openssl$ Rpm-qa | grep openssl$ Rpm-ql openssl -*2. Related directory settings, used to store certificates, temporary files and private keys$ Mkdir/etc/ssl$ Mkdir/etc/ssl/private$ Chmod 700/etc/ssl/private$ Mkdir/etc/ssl/crl$ Mkdir/etc/ssl/newcrt3. initialize the SSL configuration, tran
itself has encountered neighboring peaks, rebounded back, and then played back,This effect is echo, which means continuous echo. If an echo is applied separately, the effect is the same as that of the echo. See the following.Two Echo examples:
Play file.wav echos 0.8 0.7 700 0.25 700
In the above formula, echos is the echo timer. When this timer is used, the echo will be played back twice because the two l
(placeholder), one indicating the status of the RSS download; the other for us to get the future display of RSS content. Don't forget, we will use those style files of Brother Chen:
View plaincopy to clipboardprint? /* Default.css */Body{Background-color: # fff;Color: #000;Font-family: Verdana;Padding: 8pt;}A: link, a: visited, a: active{Color: #700;Font-weight: inherit;}H1{Text-transform: none;Font-family: inherit;Font-size: 22pt;}# Posts{Width: 99%
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