Lab setup data from the Pluralsight course on:

Getting Started with Linux System Administration

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Working with log data

journalctl --since "10 minutes ago"
cat syslog | grep eth0

Setting process priorities

nice -19 yes > /dev/null &
renice 15 -p <PID>

Working with users and groups

sudo useradd -m jane 
sudo passwd jane
sudo mkdir /var/secret
sudo groupadd secret-group
sudo chown :secret-group /var/secret
sudo usermod -a -G secret-group jane
sudo chmod g+w /var/secret

sudo chown ubuntu:secret-group /var/secret
chmod o+x data.txt
chmod 777 myfile

sudo chmod +t /var/secret
sudo ln -s /home/ubuntu/scripts/myscript.sh /var/secret/

Port scanning

nmap -v -sT localhost
nmap -v -sT bootstrap-it.com

Launching a Docker container

nano Dockerfile

##############################
# Dockerfile to create Ubuntu webserver
#
FROM ubuntu:latest

RUN apt-get update
RUN apt-get install -y apache2
RUN echo "Welcome to my web site" > /var/www/html/index.html
CMD /usr/sbin/apache2ctl -D FOREGROUND
EXPOSE 80
##############################

docker build -t "webserver" .
docker images
docker run -d -p 80:80 webserver