Uly.me

cloud engineer

JQ on GitBash

JQ is a json processor. It’s for slicing and dicing data.

Download

To install on GitBash, unzip the file and copy the executable to /usr/bin.

mv jq-win64.exe to /usr/bin/jq.exe

Create an alias. Edit ~/.bashrc.

alias jq='/usr/bin/jq.exe'

Using JQ.

jq --version
jq '.selfLink' vm.json

Tomcat Install

Tomcat requires JRE.

wget jre-8uversion-linux-x64.tar.gz
# or
apt-get install default-jdk

Install Tomcat 8 on Linux.

wget https://mirrors.gigenet.com/apache/tomcat/tomcat-8/v8.5.66/bin/apache-tomcat-8.5.66.tar.gz
tar zxpvf apache-tomcat-8.5.66.tar.gz
cd /opt/tomcat/apache-tomcat-8.5.66/bin/
./startup.sh

Status|Start|Stop|Restart Tomcat.

systemctl status tomcat8
systemctl start tomcat8
systemctl stop tomcat8
systemctl restart tomcat8

Install Syslog

How to install syslog-np on Centos 7.

cd /tmp
wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
yum -y reinstall ./epel-release-latest-7.noarch.rpm
chattr +i /etc/yum.repos.d/epel*
yum -y install syslog-ng

Enable syslog-np. Disable rsyslog.

systemctl enable syslog-ng
systemctl start syslog-ng
yum -y erase rsyslog

Install Jekyll on Amazon Linux 2

Here’s the script to install Jekyll on Amazon Linux 2.

#!/bin/bash
sudo hostnamectl set-hostname jekyll
sudo yum update -y
sudo amazon-linux-extras install ruby2.4 -y
sudo yum install ruby ruby-devel -y
sudo yum groupinstall "Development Tools" -y
sudo gem install bundler 
sudo gem install rdoc
sudo gem update --system
sudo gem install jekyll
jekyll new myblog

To start the Jekyll server.

cd mysite
jekyll build
jekyll serve --host 0.0.0.0

Open your browser and point it to the external IP of your instance on port 4000. 

http://xxx.xxx.xxx.xxx:4000

You may to edit your security group to allow ingress 4000 from 0.0.0.0/0.

Install Docker on Ubuntu 20.04 LTS

Here’s the script how to install Docker on Ubuntu 20.04 LTS.

#!/bin/bash
sudo apt-get update
# install dependencies
sudo apt-get -y install apt-transport-https ca-certificates curl software-properties-common
# add the gpg key for docker
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
# add the repository in the Linux mint 20
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(. /etc/os-release; echo "$UBUNTU_CODENAME") stable"
sudo apt-get update
# install docker e docker-compose
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(. /etc/os-release; echo "$UBUNTU_CODENAME") stable"
sudo apt-get -y install docker-ce docker-compose
# add the user system to sudo group, no sudo command
sudo usermod -aG docker $USER
# prints docker version =)
docker --version