· python django virtualenv uwsgi new relic

Integrating uWSGI with New Relic using systemd and virtualenv

Introduction:

This article explains how to integrate uWSGI with New Relic for Python. We’ll use the admin script. This method is recommended because it is easy and doesn’t require making changes to your app code.

Variables:

CentOS 7.3.1611
Python 3.4.5
uwsgi 2.0.15

Install Python 3 and uWSGI from EPEL (Extra Packages for Enterprise Linux) repository:

# yum install -y python34 python34-pip uwsgi uwsgi-plugin-python3

Create Python virtual environment:

# mkdir -p /projects/myapp
# virtualenv --python=/usr/bin/python3 /projects/myapp/venv34

Install New Relic agent in your virtualenv and generate the agent configuration file:

# source /projects/myapp/venv34/bin/activate
(venv34) # pip install newrelic
(venv34) # newrelic-admin generate-config YOUR_LICENSE_KEY newrelic.ini

We need to modify the existing systemd service unit for uWSGI to prefix the ExecStart command with newrelic-admin script:

# cp /usr/lib/systemd/system/uwsgi.service /etc/systemd/system/

# diff -u /usr/lib/systemd/system/uwsgi.service /etc/systemd/system/uwsgi.service
--- /usr/lib/systemd/system/uwsgi.service	2017-05-19 15:31:54.000000000 +0100
+++ /etc/systemd/system/uwsgi.service	2017-07-05 09:38:04.413117252 +0100
@@ -4,9 +4,10 @@
 
 [Service]
 EnvironmentFile=-/etc/sysconfig/uwsgi
+Environment="NEW_RELIC_CONFIG_FILE=/projects/myapp/newrelic.ini"
 ExecStartPre=/bin/mkdir -p /run/uwsgi
 ExecStartPre=/bin/chown uwsgi:uwsgi /run/uwsgi
-ExecStart=/usr/sbin/uwsgi --ini /etc/uwsgi.ini
+ExecStart=/projects/myapp/venv34/bin/python /projects/myapp/venv34/bin/newrelic-admin run-program /usr/sbin/uwsgi --ini /etc/uwsgi.ini
 ExecReload=/bin/kill -HUP $MAINPID
 KillSignal=SIGINT
 Restart=always

This is my uWSGI config for Django but the above setup should work with any other web framework like Flask etc.:

# cat /etc/uwsgi.d/myapp.ini
[uwsgi]

# Variables
base = /projects/myapp

# Generic Config
auto-procname = true
procname-prefix-spaced = [%i]
plugins = python3
virtualenv = %(base)/venv34
pythonpath = %(base)/myapp
module = myapp.wsgi
logto = /var/log/uwsgi/%n.log
socket = /run/uwsgi/%n.sock
chmod-socket = 777
harakiri = 30
vacuum = true
max-requests = 1000
enable-threads = true
processes = 50
cheaper-algo = spare
cheaper = 2
cheaper-step = 1

Reload the configuration and start uWSGI service:

# systemctl daemon-reload
# systemctl enable uwsgi.service
# systemctl start uwsgi.service
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