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| Warning |
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If you want to modify the config file, you need to check the validity also. Please check command here: be root and modify the file as explained here https://confluence.ecmwf.int/display/EWCLOUDKB/How+to+modify+HAproxy+config+file. You will find also more general info about the config and a way to validate your changes. |
- Open haproxy config file at
/opt/ha-proxy-certbot/haproxy/configand start modifying the config
In HAProxy, a frontend receives traffic before dispatching it to
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a backend, which is a pool of web or application servers. One of the servers in the backend will receive the request, form a response, and then send the response back through HAProxy to the client.
In your HAProxy configuration, below the frontend section, add a backend section that contains a single server. Also, add a default_backend line to your frontend that points to this new backend. Your file now looks like this:
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defaults mode http timeout client 10s timeout connect 5s timeout server 10s timeout http-request 10s frontend myfrontend bind *:80 default_backend myservers backend myservers server server1 127.0.0.1:8000 |
You can also add multiple backends:
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defaults mode http timeout client 10s timeout connect 5s timeout server 10s timeout http-request 10s frontend myfrontend bind *:80 default_backend myservers backend myservers server server1 127.0.0.1:8000 server server2 127.0.0.1:8001 server server3 127.0.0.1:8002 |
With each new request that you make to port 80, HAProxy receives it and selects a server to handle it. HAProxy rotates through the list of servers, relaying the next request to the next server in line. You are now balancing the load across these servers.
2. After saving the changes, the changes should take effect in the haproxy container.
3. You can check the validity with the following command
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docker exec -it <CONTAINER_ID> haproxy -c -f /config/haproxy.cfg |
where CONTAINER_ID, can be found using docker ps
Add health checks
https://www.haproxy.com/blog/how-to-enable-health-checks-in-haproxy
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