[Python] Gunicorn

Basic usage

gunicorn -k gevent -t 300 -w 4 -b 0.0.0.0:9500 main:app

—Gevent: asynchronous request handling

—Timeout: 300 sec

# of worker processes: 4

Deploy with nginx

/etc/systemd/system/myapi.service

[Unit]
Description=Gunicorn instance for flask API
Requires=myapi.socket
After=network.target

[Service]
User=hubert
Group=hubert
WorkingDirectory=/home/hubert/projectdir
ExecStart=/home/hubert/miniconda3/bin/gunicorn -k gevent -t 300 -w 2 myapp:app
ExecReload=/bin/kill -s HUP $MAINPID
KillMode=mixed
TimeoutStopSec=5
PrivateTmp=true

[Install]
WantedBy=multi-user.target

/etc/systemd/system/myapi.socket

[Unit]
Description=Gunicorn socket for my API.

[Socket]
ListenStream=/run/myapi.sock
# Our service won't need permissions for the socket, since it
# inherits the file descriptor by socket activation
# only the nginx daemon will need access to the socket
User=nginx
# Optionally restrict the socket permissions even more.
# Mode=600

[Install]
WantedBy=sockets.target

nginx site conf file

server {
        listen       9800;
        location / {
            proxy_pass http://unix:/run/myapi.sock;
        }
    }