hieunt79

Fix no sound

Ubuntu 22

systemctl --user restart pulseaudio

Ubuntu 20

hieunt79

How I rescue VM

• How I rescue VM
  • The problem
  • Disclaim
  • How I nail it
    • Rescue by Openstack
    • Add a volume to VM
    • Sneaking in virsh edit
• Boot from an ISO.

hieunt79

net.ipv4.ip_forward = 1
net.ipv4.ip_nonlocal_bind = 1
net.ipv6.conf.all.forwarding = 1
net.ipv6.ip_nonlocal_bind = 1
fs.file-max = 500000
net.ipv4.tcp_max_syn_backlog = 3240000
net.core.rmem_default = 31457280
net.core.rmem_max = 12582912
net.core.wmem_default = 31457280
net.core.wmem_max = 12582912

hieunt79

$ curl -I http://some.local.app.dev/?return=402
HTTP/1.1 402 Payment Required
Server: nginx/1.2.2
Date: Fri, 27 Jul 2012 19:08:19 GMT
Content-Type: text/html
Content-Length: 182
Connection: keep-alive
Keep-Alive: timeout=10

hieunt79

https://techlog360.com/how-to-dual-boot-kali-linux-v2-0-with-windows-10/

1. Unable to mount ... (somethings like cdrom or ...)
https://superuser.com/questions/962926/cant-install-kali-linux-from-usb-fails-to-find-cd-rom-drive
If step "select and install software" failed, just jump to next step.

2. You must have network connection to install cuz some package is missing. If Kali instalation can not detect driver for wifi then plug a ethernet cable
Ref: https://forums.kali.org/showthread.php?46793-Error-with-installing-Kali-Linux-2020-1-on-VMware

3. If no desktop after install:

hieunt79

#!/bin/bash
LOG_FILE=$1

#for hour in 00 01 02 03
#do
#       pattern=" $hour"
#       rph=`egrep " $hour:" $LOG_FILE | wc -l`
#       echo $hour : $rph
#done

hieunt79

#!/bin/bash

cd /tmp
ip_list="$@"

while true
clear
tput cup 0 0
do
    for ip in $ip_list

hieunt79

#!/bin/bash

export JAVA_HOME="/usr/lib/jvm/java-8-openjdk-amd64"
DELAY_FOLDER="/delay"
JMETER_BIN_DIR="$DELAY_FOLDER/jmeter/bin"

current=`date "+%s"`

# measure origin test
$JMETER_BIN_DIR/jmeter --nongui --testfile $DELAY_FOLDER/test-plans/origin/test.jmx --logfile $DELAY_FOLDER/test-results/origin/$current-sample.csv > /dev/null &

hieunt79

#!/bin/bash

for ip in {5..12}
do
ping 12.12.12.$ip| while read line; do echo `date` - $line; done >> node.$ip &
done

hieunt79

2. System Performance: Methodologies

2.1 Terminology

• IOPS: Input/output operations per second is a measure of the rate of data transfer operations. For disk I/O, IOPS refers to reads and writes per second.
• Throughput: The rate of work performed. Especially in communications, the term is used to refer to the data rate (bytes per second or bits per second). In some contexts (e.g., databases) throughput can refer to the operation rate (operations per second or transactions per second).
• Response time: The time for an operation to complete. This includes any time spent waiting and time spent being serviced (service time), including the time to transfer the result.
• latency: A measure of time an operation waiting to be serviced. In some contexts, it can refers to the entire time for an operation, equivalent to response time.
• Utilization: với các resource cung cấp theo kiểu request, đây là cách đo lường cho mức độ resource đc sử dụng (how busy a resource is), dựa trên thời gian sử