Monday, September 12, 2022
Reset MySQL Root Password on Red Hat Enterprise Linux 8
Sunday, September 11, 2022
Make PPK to Pem using Mac terminal
or
This will also install puttygen. To get puttygen to output a .PEM file:
puttygen privatekey.ppk -O private-openssh -o privatekey.pem
Once you have the key, open a terminal window and:
The private key must have tight security settings otherwise SSH complains. Make sure only the user can read the key.
Thursday, September 8, 2022
Sunday, September 4, 2022
How to access EC2 instance if lost key Pair and root credentials
Step-1:
Create a new instance with same OS as previous one or create it from AIM made from old instance
Step-2:
Shutdown the old instance and detach the volume
Step-3:
Shutdown new instance Attached the detached volume to new instance and start the instance
Step-4:
Login new instance using ssh console
Run the following commands:
lsblk
df -h
cd mnt
mkdir oldvolume
sudo mount /dev/sda1 mnt/oldvolume
cd mnt/oldvolume/root/.ssh
sudo vi authorized_keys
Now add your public key and save
umount /dev/sda1
sudo shutdown now
Step-5:
Now detach the dev/sda1 volume from new instance and attach to old instance as dev/sda
Step-6:
Reboot old instance from AWS dashboard and login your old instance using ssh console
Note: Your old instance IP will be changed after doing this if no elastic IP
Friday, September 2, 2022
Install NVM (Node Version Manager) on macOS with Homebrew
echo "# Homebrew\nexport PATH=/opt/homebrew/bin:\$PATH" >> .bash_profile
source ~/.zshrc
brew install nvm
mkdir ~/.nvm
echo "export NVM_DIR=~/.nvm\nsource \$(brew --prefix nvm)/nvm.sh" >> .bash_profile
source ~/.bash_profile
or
echo "export NVM_DIR=~/.nvm\nsource \$(brew --prefix nvm)/nvm.sh" >> .zshrc
source ~/.zshrc
nvm install 12.13.0
nvm install --lts
Wednesday, August 31, 2022
How to install and run MongoDB GUI on Ubuntu 20.04
The following are the different ways to install mongo-gui.
From npm:
Install the module globally using the command :
npm install -g mongo-gui
Then use the command to run the application
mongo-gui
From github:
First of all, clone the mongo-gui repository using the command git clone https://github.com/arunbandari/mongo-gui or download the zip file from here.
Change the directory to mongo-gui
cd mongo-gui
Install all the dependencies npm install
Start the application using either
npm start or node server.js
Note: Node.js must be installed on your machine to run this application
From Docker Hub:
Docker compose
version: '3'
services:
mongo-gui:
container_name: "mongo-gui"
image: ugleiton/mongo-gui
restart: always
ports:
- "4321:4321"
environment:
- MONGO_URL=mongodb://localhost:27017
Mongo GUI Usage
The commands mongo-gui and npm start or node server.js start the application with the following configuaration:
URL (-u): mongodb://localhost:27017
PORT (-p): 4321
and the application will be accesible at http://localhost:4321
To connect to any other mongodb instance, pass mongo connection string as an argument, eg:
Installed via npm: mongo-gui -u mongodb+srv://<username>:<password>@host/<dbnames>?retryWrites=true&w=majority'
Installed via github: (npm start --/node server.js) -u mongodb+srv://<username>:<password>@host/<dbnames>?retryWrites=true&w=majority'
Available options:
-u: url, mongo-gui tries to connect to this mongodb instance
-p: port, mongo-gui listens on this port
Tuesday, August 30, 2022
Failed to start mongod.service: Unit mongod.service not found Solved !
When I started MongoDB got an error as:
"Failed to start mongod.service: Unit mongod.service not found."
Check port and configuration
Solution:
sudo service mongod status
sudo systemctl enable mongod
sudo service mongod restart
service mongod stop #dont start mongod…instead… systemctl start mongod #then mongo command
#then
mongo
How to get Ranking of the Students in Excel using RANK Function
=RANK(number,ref,[order]) To rank in descending order, we will use the formula =RANK(B2,($C$5:$C$10),0) If we want unique ranks, we can use...
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Put the following code in a TXT file and save as "file.cmd" then run the cmd file as administrator. @echo off title Activate Micr...
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We can install PowerMTA on the server. rpm -ivh /home/PowerMTA-4.0r6.x86_64.rpm You will see the output like this Preparing... #############...
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# $Id: config 2015-03-24 16:00:00 Jack $ # Sample PowerMTA configuration file # PowerMTA Multiple Virtual PMTA config file sample # # E-mai...