How to Monitor Nginx by using Stub Status Module on Ubuntu 21.04

To Monitor Nginx by using Stub Status Module on Ubuntu 21.04

Introduction:

The NGINX web server can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache. In this module, you will find information about the basic status of the ngx_http_stub_status_context.

Installation Procedure:

Step 1: Check the OS version by using the below command

root@linuxhelp:~# lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 21.04
Release:	21.04
Codename:	hirsute

Step 2: Install the Nginx by using the below command

root@linuxhelp:~# apt install nginx -y
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following package was automatically installed and is no longer required:
  libllvm11
Use 'apt autoremove' to remove it.
The following additional packages will be installed:
  libnginx-mod-http-geoip2 libnginx-mod-http-image-filter libnginx-mod-http-xslt-filter libnginx-mod-mail
  libnginx-mod-stream libnginx-mod-stream-geoip2 nginx-common nginx-core
Suggested packages:
  fcgiwrap nginx-doc
The following NEW packages will be installed:
  libnginx-mod-http-geoip2 libnginx-mod-http-image-filter libnginx-mod-http-xslt-filter libnginx-mod-mail
  libnginx-mod-stream libnginx-mod-stream-geoip2 nginx nginx-common nginx-core
0 upgraded, 9 newly installed, 0 to remove and 0 not upgraded.

Step 3: Check the status of the Nginx by using the below command

root@linuxhelp:~# systemctl status nginx
● nginx.service - A high performance web server and a reverse proxy server
     Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
     Active: active (running) since Sat 2022-01-22 04:44:06 IST; 25s ago
       Docs: man:nginx(8)
    Process: 9631 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
    Process: 9632 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
   Main PID: 9723 (nginx)
      Tasks: 3 (limit: 2254)
     Memory: 4.6M
     CGroup: /system.slice/nginx.service
             ├─9723 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
             ├─9726 nginx: worker process
             └─9727 nginx: worker process

Step 4: Check the Presence of stub_status module in Nginx by using the below command

root@linuxhelp:~# nginx -V 2>&1 | grep --color -- --with-http_stub_status_module
configure arguments: --with-cc-opt='-g -O2 -ffile-prefix-map=/build/nginx-DUpigx/nginx-1.18.0=. -flto=auto -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security -fPIC -Wdate-time -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -flto=auto -Wl,-z,relro -Wl,-z,now -fPIC' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --modules-path=/usr/lib/nginx/modules --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-compat --with-debug --with-pcre-jit --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_v2_module --with-http_dav_module --with-http_slice_module --with-threads --add-dynamic-module=/build/nginx-DUpigx/nginx-1.18.0/debian/modules/http-geoip2 --with-http_addition_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_sub_module

Step 5: Change the default server block with stub_status Module by using the below command

root@linuxhelp:~# vim /etc/nginx/sites-available/default 
server_name _;

        location /nginx_status {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
                #try_files $uri $uri/ =404;
                stub_status;
        }

Step 6: Reload the configurations of Nginx by using the below command

root@linuxhelp:~# service nginx reload

Step 7:Curl the following link to see status by using the below command

root@linuxhelp:~# curl http://127.0.0.1/nginx_status
Active connections: 1 
server accepts handled requests
 1 1 1 
Reading: 0 Writing: 1 Waiting: 0 

Step 8: Ping the http://127.0.0.1 in browser for testing purpose

Step 9: Curl the following link to see status by using the below command

root@linuxhelp:~# curl http://127.0.0.1/nginx_status
Active connections: 2 
server accepts handled requests
 3 3 5 
Reading: 0 Writing: 1 Waiting: 1 

By this to Monitor Nginx by using Stub Status Module on Ubuntu 21.04 has been completed