Installs the nginx and logwatcher plugins for newrelic on a CentOS system.

install_newrelic_plugins

#!/bin/bash

# ----------------------------------------------------------------------      
# Prelimenary checks                                                          
# ----------------------------------------------------------------------      

# Make sure there's a license key file.                                       
KEYFILE="LICENSEKEY"
if [ ! -e $KEYFILE ]; then
    echo "No LICENSEKEY found."
    echo "Please copy your new relic license key"
    echo "into a file called LICENSEKEY in this directory."
    exit 1
else

    # Read the license key from the file.                                     
    KEY=`cat $KEYFILE`

    # Make sure it's not empty.                                               
    if [ -z $KEY ]; then
        echo "No key found in $KEYFILE."
        echo "Please copy your new relic license key into this file."
        exit 1
    fi

fi


# ----------------------------------------------------------------------      
# Install Ruby crap                                                           
# ----------------------------------------------------------------------      

# Make sure ruby-dev and ruby gems is on the system.                          
sudo yum install -y ruby-devel
sudo yum install -y rubygems

# Download the ruby bundler.                                                  
sudo gem install bundler


# ----------------------------------------------------------------------      
# Downloads folder and other tools                                            
# ----------------------------------------------------------------------      

# Where should we download new relic foo?                                     
DOWNLOADS='/newrelic'

# Does a newrelic folder already exist?                                       
if [ ! -e $DOWNLOADS ]; then
    sudo mkdir $DOWNLOADS
fi

# We'll need unzip                                                            
if ! hash unzip 2>/dev/null; then
    sudo yum install -y unzip
fi


# ------------------------------------------------------------------------    
# Install NGINX plugin                                                        
# ------------------------------------------------------------------------    

# Make sure the nginx_stub_status has a server block in the nginx confs.      
sudo echo '' > /etc/nginx/conf.d/stub_status.conf
sudo echo 'server {' >> /etc/nginx/conf.d/stub_status.conf
sudo echo '    listen 127.0.0.1;' >> /etc/nginx/conf.d/stub_status.conf
sudo echo '    location /nginx_stub_status {' >> /etc/nginx/conf.d/stub_statu\
s.conf
sudo echo '        stub_status on;' >> /etc/nginx/conf.d/stub_status.conf
sudo echo '        access_log off;' >> /etc/nginx/conf.d/stub_status.conf
sudo echo '        allow 127.0.0.1;' >> /etc/nginx/conf.d/stub_status.conf
sudo echo '        deny all;' >> /etc/nginx/conf.d/stub_status.conf
sudo echo '    }' >> /etc/nginx/conf.d/stub_status.conf
sudo echo '}' >> /etc/nginx/conf.d/stub_status.conf
sudo echo '' >> /etc/nginx/conf.d/stub_status.conf

# Restart nginx.                                                              
sudo service nginx restart

# Download the new relic nginx plugin and unpack it.                          
curl -O http://nginx.com/download/newrelic/newrelic_nginx_agent.tar.gz
tar -xzf newrelic_nginx_agent.tar.gz
rm -rf newrelic_nginx_agent.tar.gz

# Bundle it.                                                                  
cd newrelic_nginx_agent
sudo bundle install

# Copy the config file.                                                       
cp config/newrelic_plugin.yml.in config/newrelic_plugin.yml

# Add your license key:                                                        
sed -i "s/license_key: 'YOUR_LICENSE_KEY_HERE'/license_key: '$KEY'/" config/n\
ewrelic_plugin.yml

# Start the daemon.                                                           
sudo ./newrelic_nginx_agent.daemon start


# ------------------------------------------------------------------------    
# Install Logwatcher                                                          
# ------------------------------------------------------------------------    

# Make sure we're in the downloads folder.                                    
cd $DOWNLOADS

# What's the name of the folder we'll keep logwatcher stuff in?               
LOGWATCHER='logwatcher'

# Skip all this installation if the logwatcher folder already exists.         
if [ ! -e $LOGWATCHER ]; then

    # Create the directory.                                                   
    sudo mkdir $LOGWATCHER && cd $LOGWATCHER

    # Download the logwatcher package.                                        
    sudo curl -O -L https://github.com/railsware/newrelic_platform_plugins/ar\
chive/master.zip
    sudo unzip master.zip
    sudo rm -rf master.zip

    # Copy the logwatcher package and delete the rest.                        
    sudo cp -r newrelic_platform_plugins-master/newrelic_logwatcher_agent .
    sudo rm -rf newrelic_platform_plugins-master

    # Change into the logwatche directory and bundle it.                      
    cd newrelic_logwatcher_agent
    sudo bundle install

    # Copy the config file.                                                   
    sudo cp config/newrelic_plugin.yml.example config/newrelic_plugin.yml

    # Add our key.                                                            
    sudo sed -i "s/license_key: 'YOUR_LICENSE_KEY_HERE'/license_key: '$KEY'/"\
 config/newrelic_plugin.yml

    # Add the paths to our log file.                                          
    LOG1='\/var\/log\/nginx\/nara.access.log'
    sudo sed -i "s/log_path: tmp.log/log_path: $LOG1/" config/newrelic_plugin\
.yml
    LOG2='\/var\/log\/nginx\/nara.error.log'
    sudo sed -i "s/log_path: tmp2.log/log_path: $LOG2/" config/newrelic_plugi\
n.yml

    # Add errors to watch for in our logs.                                    
    # ERROR1='HTTP\\\/1\\\.1\\\" 40[0-9]|50[0-9] '                            
    ERROR1='404'
    sudo sed -i "0,/term: \"\[Ee\]rror   \"/{s/term: \"\[Ee\]rror   \"/term: \
\"$ERROR1\"/}" config/newrelic_plugin.yml

    # Start up the logwatcher.                                                
    sudo ruby newrelic_logwatcher_agent.rb &

fi