December 10, 2020 / Nirav Shah
Supervisor is a client/server system that allows to monitor and control a number of processes on UNIX-like operating systems.
The components of the Supervisor are:
You have to install python on your server.
By downloading the Supervisor package by the command
#apt-get install python-setuptools sudo easy_install supervisor
Now reboot your server and chillout.
Now we have to create a file inside the Etc folder and named supervisor. Follow below command:
sudo mkdir /etc/supervisor
Run the command echo_supervisord_conf to print a “sample” Supervisor configuration file to your terminal stdout.
Next, type the command as below as a root:
echo_supervisord_conf > /etc/supervisor/supervisord.conf [include] files=conf.d/*.conf
Starting the supervisor server
Firstly, create a file called supervisord.service in the /etc/systemd/system directory.
Open it with vim and add the following below to the file.
[Unit] Description=Supervisor daemon Documentation=http://supervisord.org After=network.target [Service] ExecStart=/usr/local/bin/supervisord -n -c /etc/supervisor/supervisord.conf ExecStop=/usr/local/bin/supervisorctl $OPTIONS shutdown ExecReload=/usr/local/bin/supervisorctl $OPTIONS reload KillMode=process Restart=on-failure RestartSec=42s [Install] WantedBy=multi-user.target Alias=supervisord.service
Save the file using :wq!
And start the supervised service by the following command and see the status.
systemctl start supervisord.service systemctl status supervisord.service
Adding a Program
Now we are going to add the script.
supervisor_cw_hello.sh. sudo touch supervisor_cw_hello.sh sudo nano supervisor_cw_hello.sh #!/bin/bash while true do echo "This is xyz" # Echo current timestamp to stdout echo Hello Supervisor: `date` # Echo 'error!' to stderr echo An error occurred at `date`! >&2 sleep 1 done
Make the script executable with the command below:
sudo chmod +x supervisor_cw_hello.sh sudo touch /etc/supervisor/conf.d/supervisor_cw_hello.conf
Add the following with nano
[program:supervisor_cw_hello] command=/home/ayo/supervisor_cw_hello.sh autostart=true autorestart=true stderr_logfile=/var/log/hello.err.log stdout_logfile=/var/log/hello.out.log
After successfully adding a new program, we should run the following two commands.
sudo supervisorctl reread sudo supervisorctl update sudo supervisorctl
You can see the process called supervisor_cw_hello with a RUNNING status.
To see all available commands, type help
The Web Server Client: To allow access to the supervisord web server, open the supervisord configuration file and locate the [inet_http_server] section.
sudo nano /etc/supervisor/supervisord.conf
Edit the following configuration
[inet_http_server] port=*:9001 username=user password=123
Add username and password and restart the service
sudo systemctl restart supervisord.service
Service is running on port 9001 on your firewall.
and it is working. This concludes the installation and working of AWS Supervisor for monitoring the OS processes.
As a Director of Eternal Web Private Ltd an AWS consulting partner company, Nirav is responsible for its operations. AWS, cloud-computing and digital transformation are some of his favorite topics to talk about. His key focus is to help enterprises adopt technology, to solve their business problem with the right cloud solutions.
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