Troubleshooting Server Issues with systemctl, netstat

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Sun Apr 18 2021 03:10:25 GMT+0000 (Coordinated Universal Time)

Saved by @FlorianC #linux #server #services #cloud

# check the status of the web server i.e apache2
sudo systemctl status apache2

# restart the service
sudo systemctl restart apache2

# return network-related information using a combination of flags along with the netstat command to check which process is using a particular port
sudo netstat -nlp

# find python3 programs running
ps -ax | grep python3

# kill a process by its process ID (PID)
sudo kill [process-id]

# let's check for the availability of any service with the keywords "python" or "jimmy"
sudo systemctl --type=service | grep jimmy

# stop and disable a service using
sudo systemctl stop _servicename_ && sudo systemctl disable _servicename_

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Linux

@FlorianC

Make a file executable in Linux Basic Bash commands Basic Bash script Basic while-loop in Bash Basic for-loop in Bash Replace file extensions in Bash Replace file extensions in Bash Find the most common processes in a log file with Bash Find files by name Change file names The diff and patch commands Trigger manual run of the Puppet agent on Linux Some Docker commands Some Nginx commands Troubleshooting Server Issues with systemctl, netstat Unpack tar file Create new cron job in Linux Stress Test for CPU on Linux Get full file path in Linux

#commandline #interesting #windows #ubuntu #linux

Useful snippet to easily access Ubuntu from Windows (in WSL2)

ip addr | grep eth0 | grep inet | awk '{print $2}' | awk -F '/' '{print $1}' | awk '{printf "%s:3000", $0}' | clip.exe

#installation #linux #bash #wsl #github #cli

Install gh-cli (Linux)

#!/usr/bin/env bash

# install github-cli
VERSION=`curl  "https://api.github.com/repos/cli/cli/releases/latest" | grep '"tag_name"' | sed -E 's/.*"([^"]+)".*/\1/' | cut -c2-`
echo $VERSION
mkdir ~/downloads
curl -sSL https://github.com/cli/cli/releases/download/v${VERSION}/gh_${VERSION}_linux_amd64.tar.gz -o ~/downloads/gh_${VERSION}_linux_amd64.tar.gz
cd ~/downloads
tar xvf gh_${VERSION}_linux_amd64.tar.gz
sudo cp gh_${VERSION}_linux_amd64/bin/gh /usr/local/bin/
gh version
sudo cp -r ~/downloads/gh_${VERSION}_linux_amd64/share/man/man1/* /usr/share/man/man1/
# man gh
gh auth login

rm -r ~/downloads

#cloud #ssh

ssh to a server

ssh -i /Users/iliasdh/.ssh/nesk_vision iliasdh@34.125.137.168

#linux #server #services #cloud

Troubleshooting Server Issues with systemctl, netstat

# check the status of the web server i.e apache2
sudo systemctl status apache2

# restart the service
sudo systemctl restart apache2

# return network-related information using a combination of flags along with the netstat command to check which process is using a particular port
sudo netstat -nlp

# find python3 programs running
ps -ax | grep python3

# kill a process by its process ID (PID)
sudo kill [process-id]

# let's check for the availability of any service with the keywords "python" or "jimmy"
sudo systemctl --type=service | grep jimmy

# stop and disable a service using
sudo systemctl stop _servicename_ && sudo systemctl disable _servicename_

#aws #cdk #cloud

AWS route53

https://kuchbhilearning.blogspot.com/2022/09/aws-route53.html

#aws-cdk #aws #cloud

Disadvantages of Event Bridge

https://kuchbhilearning.blogspot.com/2022/10/disadvantages-of-event-bridge.html

#bash #linux

Linux Signals help

https://www.computerhope.com/unix/signals.htm

#dig #linux #dns

command+line+-+How+can+I+save+the+output+of+DIG+in+CSV+format?+-+Ask+Ubuntu

undefined

#javascript #linux #nodejs

Launch Node server background with npm command

sudo forever start --sourceDir /opt/bitnami/projects/nesk_back -c "npm run prod" /

#linux

Make a file executable in Linux

# replace _file_name_ with the name of the file that is to be made executable including its filetype suffix, e.g. ".py"
chmod +x _file_name_

#puppet #linux

Trigger manual run of the Puppet agent on Linux

sudo puppet agent -v --test

#linux #docker

Some Docker commands

# install docker
sudo apt-get install docker.io

# create and run a container from an image from the Docker Hub
sudo docker run --name firstContainer ubuntu:latest # where firstContainer is the name of the container

# list locally available docker containers
sudo docker ps -a

# open a docker container in interactive mode in the terminal
sudo docker run -it --name myContainer ubuntu:latest # where myContainer is the container name
# you can exit the container by pressing CTRL+P and CTRL+Q

# attach container to terminal
sudo docker attach myContainer # the container will now stay open in the background even after exiting via CTRL+P and CTRL+Q

# execute commands in the container running in the background
sudo docker exec myContainer echo $PATH

# delete containers
sudo docker rm -f firstContainer myContainer

# create new docker image based on your local environment/container
sudo docker commit myNginx docker_id/image_name # where myNginx is the name of your currently running container

# create new docker container from an image from a previously committed image
sudo docker run -it --name nginxNew docker_id/image_name

# list images on your machine
sudo docker image ls

# login to your docker hub account from the terminal
sudo docker login # you will be prompted to enter your id and password

# push an image to docker hub when logged into your docker account
sudo docker push docker_id/image_name

# run a docker container in the background
sudo docker run -d --name myApp nginx

# start an interactive bash terminal for the container running in the background
sudo docker exec -it myApp bashapt-get

# stop a running container
sudo docker stop myApp

# start a stopped container again
sudo docker start myApp

#linux #nginx

Some Nginx commands

# start a web service using nginx
service nginx start

# check nginx landing page using curl
curl http://localhost:80

#ubuntu #bash #linux

update nodejs on ubuntu

curl -fsSL https://deb.nodesource.com/setup_current.x | sudo -E bash -
sudo apt-get install -y nodejs

#linux #cron

Create new cron job in Linux

crontab -e

Troubleshooting Server Issues with systemctl, netstat

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