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diff --git a/docs/Running-behind-haproxy.md b/docs/Running-behind-haproxy.md new file mode 100644 index 000000000..2c1835f50 --- /dev/null +++ b/docs/Running-behind-haproxy.md @@ -0,0 +1,280 @@ +# Netdata via HAProxy + +> HAProxy is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited for very high traffic web sites and powers quite a number of the world's most visited ones. + +If Netdata is running on a host running HAProxy, rather than connecting to Netdata from a port number, a domain name can be pointed at HAProxy, and HAProxy can redirect connections to the Netdata port. This can make it possible to connect to Netdata at https://example.com or https://example.com/netdata/, which is a much nicer experience then http://example.com:19999. + +To proxy requests from [HAProxy](https://github.com/haproxy/haproxy) to Netdata, the following configuration can be used: + +## Default Configuration + +For all examples, set the mode to `http` + +``` +defaults + mode http +``` + +## Simple Configuration + +A simple example where the base URL, say http://example.com, is used with no subpath: + +### Frontend + +Create a frontend to recieve the request. + +``` +frontend http_frontend + ## HTTP ipv4 and ipv6 on all ips ## + bind :::80 v4v6 + + default_backend netdata_backend +``` + +### Backend + +Create the Netdata backend which will send requests to port `19999`. + +``` +backend netdata_backend + option forwardfor + server netdata_local 127.0.0.1:19999 + + http-request set-header Host %[src] + http-request set-header X-Forwarded-For %[src] + http-request set-header X-Forwarded-Port %[dst_port] + http-request set-header Connection "keep-alive" +``` + +## Configuration with subpath + +A example where the base URL is used with a subpath `/netdata/`: + +### Frontend + +To use a subpath, create an ACL, which will set a variable based on the subpath. + +``` +frontend http_frontend + ## HTTP ipv4 and ipv6 on all ips ## + bind :::80 v4v6 + + # URL begins with /netdata + acl is_netdata url_beg /netdata + + # if trailing slash is missing, redirect to /netdata/ + http-request redirect scheme https drop-query append-slash if is_netdata ! { path_beg /netdata/ } + + ## Backends ## + use_backend netdata_backend if is_netdata + + # Other requests go here (optional) + # put netdata_backend here if no others are used + default_backend www_backend +``` + +### Backend + +Same as simple example, expept remove `/netdata/` with regex. + +``` +backend netdata_backend + option forwardfor + server netdata_local 127.0.0.1:19999 + + http-request set-path %[path,regsub(^/netdata/,/)] + + http-request set-header Host %[src] + http-request set-header X-Forwarded-For %[src] + http-request set-header X-Forwarded-Port %[dst_port] + http-request set-header Connection "keep-alive" +``` + +## Using TLS communication + +TLS can be used by adding port `443` and a cert to the frontend. This example will only use Netdata if host matches example.com (replace with your domain). + +### Frontend + +This frontend uses a certificate list. + +``` +frontend https_frontend + ## HTTP ## + bind :::80 v4v6 + # Redirect all HTTP traffic to HTTPS with 301 redirect + redirect scheme https code 301 if !{ ssl_fc } + + ## HTTPS ## + # Bind to all v4/v6 addresses, use a list of certs in file + bind :::443 v4v6 ssl crt-list /etc/letsencrypt/certslist.txt + + ## ACL ## + # Optionally check host for Netdata + acl is_example_host hdr_sub(host) -i example.com + + ## Backends ## + use_backend netdata_backend if is_example_host + # Other requests go here (optional) + default_backend www_backend +``` + +In the cert list file place a mapping from a certificate file to the domain used: + +`/etc/letsencrypt/certslist.txt`: + +``` +example.com /etc/letsencrypt/live/example.com/example.com.pem +``` + +The file `/etc/letsencrypt/live/example.com/example.com.pem` should contain the key and certificate (in that order) concatenated into a `.pem` file.: + +``` +$ cat /etc/letsencrypt/live/example.com/fullchain.pem \ + /etc/letsencrypt/live/example.com/privkey.pem > \ + /etc/letsencrypt/live/example.com/example.com.pem +``` + +### Backend + +Same as simple, except set protocol `https`. + +``` +backend netdata_backend + option forwardfor + server netdata_local 127.0.0.1:19999 + + http-request add-header X-Forwarded-Proto https + http-request set-header Host %[src] + http-request set-header X-Forwarded-For %[src] + http-request set-header X-Forwarded-Port %[dst_port] + http-request set-header Connection "keep-alive" +``` + +## Enable authentication + +To use basic HTTP Authentication, create a authentication list: + +``` +# HTTP Auth +userlist basic-auth-list + group is-admin + # Plaintext password + user admin password passwordhere groups is-admin +``` + +You can create a hashed password using the `mkpassword` utility. + +``` +$ printf "passwordhere" | mkpasswd --stdin --method=sha-256 +$5$l7Gk0VPIpKO$f5iEcxvjfdF11khw.utzSKqP7W.0oq8wX9nJwPLwzy1 +``` + +Replace `passwordhere` with hash: + +``` +user admin password $5$l7Gk0VPIpKO$f5iEcxvjfdF11khw.utzSKqP7W.0oq8wX9nJwPLwzy1 groups is-admin +``` + +Now add at the top of the backend: + +``` +acl devops-auth http_auth_group(basic-auth-list) is-admin +http-request auth realm netdata_local unless devops-auth +``` + +## Full Example + +Full example configuration with HTTP auth over TLS with subpath: + +``` +global + maxconn 20000 + + log /dev/log local0 + log /dev/log local1 notice + user haproxy + group haproxy + pidfile /run/haproxy.pid + + stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners + stats timeout 30s + daemon + + tune.ssl.default-dh-param 4096 # Max size of DHE key + + # Default ciphers to use on SSL-enabled listening sockets. + ssl-default-bind-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!MD5:!DSS + ssl-default-bind-options no-sslv3 + +defaults + log global + mode http + option httplog + option dontlognull + timeout connect 5000 + timeout client 50000 + timeout server 50000 + errorfile 400 /etc/haproxy/errors/400.http + errorfile 403 /etc/haproxy/errors/403.http + errorfile 408 /etc/haproxy/errors/408.http + errorfile 500 /etc/haproxy/errors/500.http + errorfile 502 /etc/haproxy/errors/502.http + errorfile 503 /etc/haproxy/errors/503.http + errorfile 504 /etc/haproxy/errors/504.http + +frontend https_frontend + ## HTTP ## + bind :::80 v4v6 + # Redirect all HTTP traffic to HTTPS with 301 redirect + redirect scheme https code 301 if !{ ssl_fc } + + ## HTTPS ## + # Bind to all v4/v6 addresses, use a list of certs in file + bind :::443 v4v6 ssl crt-list /etc/letsencrypt/certslist.txt + + ## ACL ## + # Optionally check host for Netdata + acl is_example_host hdr_sub(host) -i example.com + acl is_netdata url_beg /netdata + + http-request redirect scheme https drop-query append-slash if is_netdata ! { path_beg /netdata/ } + + ## Backends ## + use_backend netdata_backend if is_example_host is_netdata + default_backend www_backend + +# HTTP Auth +userlist basic-auth-list + group is-admin + # Hashed password + user admin password $5$l7Gk0VPIpKO$f5iEcxvjfdF11khw.utzSKqP7W.0oq8wX9nJwPLwzy1 groups is-admin + +## Default server(s) (optional)## +backend www_backend + mode http + balance roundrobin + timeout connect 5s + timeout server 30s + timeout queue 30s + + http-request add-header 'X-Forwarded-Proto: https' + server other_server 111.111.111.111:80 check + +backend netdata_backend + acl devops-auth http_auth_group(basic-auth-list) is-admin + http-request auth realm netdata_local unless devops-auth + + option forwardfor + server netdata_local 127.0.0.1:19999 + + http-request set-path %[path,regsub(^/netdata/,/)] + + http-request add-header X-Forwarded-Proto https + http-request set-header Host %[src] + http-request set-header X-Forwarded-For %[src] + http-request set-header X-Forwarded-Port %[dst_port] + http-request set-header Connection "keep-alive" +``` + +[]() |