Bash script to update PM2-managed web services and verify online status post-rebuild. Stops the process, pulls code changes, runs npm install if needed, and restarts. Continuously checks HTTP status until the service is back online, reporting the time taken.

pm2-update-restart-check.sh

#!/bin/bash

# Configuration variables
PROCESS_ID=1                       # PM2 process ID
DOMAIN_URL=https://example.com     # Domain to check
CHECK_INTERVAL=10                  # Interval for HTTP check in seconds
SERVICE_DIRECTORY=path-to-folder/  # Directory of the web service

# Function to check HTTP status code
check_http_status() {
    start_time=$(date +%s)

    while true; do
        http_code=$(curl -o /dev/null -s -w "%{http_code}\n" -L $DOMAIN_URL)
        current_time=$(date +%s)
        elapsed_time=$((current_time - start_time))

        if [ "$http_code" -eq 200 ]; then
            echo "Received 200 OK after $elapsed_time seconds."
            return
        else
            echo "Waiting... Time elapsed: $elapsed_time seconds."
            sleep $CHECK_INTERVAL
        fi
    done
}

# Main script operations

# Listing PM2 processes
pm2 ls

# Stopping the process
pm2 stop $PROCESS_ID

# Changing directory to the service directory
cd $SERVICE_DIRECTORY

# Pulling the latest changes from the git repository
git pull

# Checking if package.json was modified
if git diff HEAD@{1} HEAD --name-only | grep -q "package.json"
then
    echo "package.json changed, running npm i..."
    npm i
else
    echo "package.json not changed"
fi

# Starting the process
pm2 start $PROCESS_ID

# Checking the HTTP status after starting the application
echo "Checking the HTTP status of $DOMAIN_URL..."
check_http_status

Bash script to update PM2-managed web services and verify online status post-rebuild. Stops the process, pulls code changes, runs npm install if needed, and restarts. Continuously checks HTTP status until the service is back online, reporting the time taken.