Spectre Meltdown vulnerability patch repair security tips
Spectre/Meltdown events seem to have entered the second stage-various vendors have released their own repair solutions. However, it does not seem as smooth as imagined. The industrial control system vendor Wonderware said that the Meltdown patch affected the stability of the industrial control system, while the SolarWinds found that the patch caused a soaring CPU usage.
Meltdown patch causes
=192.168.6.151:6379INFO[0000] Starting server on port :40001...
HTTP creation job with the goal of capturing the outbound and inbound traffic for a Cisco router port every 30 seconds
//create job , get job id ,can use job-id view statuscurl http://127.0.0.1:40001/api/v1/job/ -d '{"epsilon": "PT10S", "command": "/slview/test/zhangqi/snmpwalk.sh", "name": "zhangqi_job", "schedule": "R/2017-06-08T11:15:00.819236718+08:00/PT30S"}'{"id":"6973f82d-09d2-474f-630f-16d9ad27b484"}//shell#!/bin/shmore snmp
Go down to this site download memory Bandwidth test Tool http://ahorvath.home.cern.ch/ahorvath/mbw/
It is recommended to download the RPM package, which is convenient to use after the installation is complete.
[Root@master soft]# mbw-q-N 1 2560 method:memcpy elapsed:0.10434 mib:256.00000 copy:2453.447 mib/sAVG method:memcpy elapsed:0.10434 mib:256.00000 copy:245
After your server is hosted and shelved in the data center, it will officially provide external services for 7x24 hours. The incoming and outgoing data packets in the server have a certain amount of traffic, and the data center will also monitor and control the traffic on your server. When traffic on your server is abnormal, they will immediately control the traffic.Common traffic monitoring software include DU Meter, MRTG, PRTG, and SolarWinds. Curre
System Environment RHEL6 # yuminstallnet-snmpnet-snmp-utils-y # snmpwalk-v1-cpubliclocalhostIP-MIB: ipAdEntIfIndexCreateddirectory:/var/lib/net-snmp/mib_indexesTimeout
# Yum install net-snmp-utils-y
# Snmpwalk-v 1-c public localhost IP-MIB: ipAdEntIfIndex
Created directory:/var/lib/net-snmp/mib_indexes
Timeout: No Response from localhost
No data can be extracted. We need to modify/etc/snmp/snmpd. conf.
# V
The use of SNMP has become a default project for many devices. Then, some of the module applications have become the focus of attention. This article mainly introduces the establishment of SNMP Trap. First, let's take a look at the use environment of this Protocol.
Develop Trap macro types
It should be noted that the expansion of the Trap macro occurs in terms of completion, not during running.
Formulate enterprise terms
Enterprise terms must be existing, define enterprise management, and regist
(A, n=100):
Time.sleep (1)
b = [a] * n
Time.sleep (1)
Return b
if __name__ = = ' __main__ ':
A = My_func ()
Print Cur_python_mem ()
Print ""
Print Memory_usage ((f, (1,), {' n ': Int (1e6)}), interval=0.5)
Run the above code and the output is:
Copy Code code as follows:
jay@jay-air:~/workspace/python.git/py2014 $python mem_profile.py
Filename:mem_profile.py
Line # Mem usage Increment line Contents
================================================
8.0
can be reset by sysctl the command line excuse.
The SYSCTL function returns a consistent snapshot based on the needs of the data. Consistency includes being locked into the destination buffer memory so that the data is copied out without the need for a lock, and the call function Sysctl to avoid deadlock.
This rule is described in the form of a MIB name, listing name, and the length of this name is the parameter Namelen.
The Sysctlbyname function acc
One: How do I create my own MIB?
First of all: to define their own MIB, first familiar with the ASN.1 syntax, which has a foreigner's MIB book is very good, MIB's RFC document is it defined as if.
Second: See more other MIB, in fact, the definition is relatively simple, is type, scalar, table three main things.
II:
1. Basic principles of SNMP
SNMP adopts a special form of client/server model: Agent/management station model. The management and maintenance of the network is throughManagement workstationAndSNMP proxyInteraction between them. Each SNMP agent is responsible for answering various queries on the MIB definition information of the SNMP management workstation (master agent. 10 is the implementation model of SNMP protocol in NMS network products.
Figure 1
The following C function can be used to check whether your program is being debugged:
static bool debuggerRunning(void){ int junk; int mib[4]; struct kinfo_proc info; size_t size; info.kp_proc.p_flag = 0; mib[0] = CTL_KERN; mib[1] = KERN_PROC; mib[2] = KE
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