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Eduard
Eduard

Reputation: 3576

Nginx/Apache to check another webserver status (online / offline)

OK, so I am using nginx + php fastcgi, I need to show visitors an custom error page saying that the we are experiencing technical problems, how can I do that ?

Should I install nginx on 80 as proxy to another nginx server listening to 8080 and check it's status with HttpHealthcheck Module, or is there a better solution ?

Upvotes: 1

Views: 1818

Answers (1)

Marcelo Bittencourt
Marcelo Bittencourt

Reputation: 607

You going to need an 3rd party addon to check your backend server, check this: http://wiki.nginx.org/HttpHealthcheckModule

When the backend is down, nginx answer an 502 error, you can set a custom page for it.

error_page   500 502 503 504  /50x.html;
location = /50x.html {
    root   /usr/share/nginx/html;
}

New answer :)

I would use haproxy(http://haproxy.1wt.eu/) for that.

haproxy as your frontend listening on port 80, and nginx+php-fpm as backend

installing HAProxy: (verify your settings and edit the scripts)

make TARGET=linux26 CPU=x86_64
cp haproxy /usr/sbin/haproxy
wget http://layer1.rack911.com/haproxy/haproxy-standard.cfg -O /etc/haproxy.cfg
wget http://layer1.rack911.com/haproxy/haproxy.init -O /etc/init.d/haproxy
chmod +x /etc/init.d/haproxy

haproxy.cfg (I didn´t include the global/default sessions)

frontend webserver-80
        bind <ip>:80
        option forwardfor
        option http-server-close
        default_backend backend-nginx

backend backend-nginx
        #balance roundrobin
        balance source
        option httpchk GET /fpm_ping
        server srv1 <ip>:<port> weight 1 check
        errorfile    503        /etc/errors/503_noserver.txt

Check hatop util (http://code.google.com/p/hatop/) or include an stats session to haproxy.cfg so you can check on haproxy status...

listen stats :<port>
        balance
        mode http
        stats enable
        stats auth admin:admin
        stats uri /
#       option   httplog

Configure php-fpm to respond the ping requests (or change it to other check)

On /etc/nginx/nginx.conf

location /fpm_ping {
    access_log     off;
    allow          <ipaddr/cidr>;
    allow          127.0.0.1;
    deny           all;
    root           html;
    fastcgi_pass   127.0.0.1:9000;
    fastcgi_index  index.php;
    fastcgi_param  SCRIPT_FILENAME  /usr/share/nginx/html$fastcgi_script_name;
    include        fastcgi_params;
}

On /etc/php-fpm.d/www.conf include/uncomment

ping.path = /fpm_ping
ping.response = pong

Upvotes: 1

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