Refs #10 - Possibility to change frontend/backend to via environment variables

Author: avoinea

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 - Upgrade to haproxy 1.8
 
+- Possibility to change frontend/backend `mode` to `TCP` via environment variables `FRONTEND_MODE` and `BACKENDS_MODE` [refs #10]
+
 ## 2017-11-30 (1.7-4.1)
 
 - bugfix add LOG_LEVEL to /etc/environment as well

haproxy/Readme.md

@@ -129,11 +129,13 @@ either when running the container or in a `docker-compose.yml` file.
   * `STATS_AUTH` The authentication details (written as `user:password` for the statistics page - default `admin:admin`
   * `FRONTEND_NAME` The label of the frontend - default `http-frontend`
   * `FRONTEND_PORT` The port to bind the frontend to - default `5000`
+  * `FRONTEND_MODE` Frontend mode - default `http`
   * `PROXY_PROTOCOL_ENABLED` The option to enable or disable accepting proxy protocol (`true` stands for enabled, `false` or anything else for disabled) - default `false`
   * `COOKIES_ENABLED` The option to enable or disable cookie-based sessions (`true` stands for enabled, `false` or anything else for disabled) - default `false`
   * `BACKEND_NAME` The label of the backend - default `http-backend`
   * `BACKENDS` The list of `server_ip:server_listening_port` to be load-balanced by HAProxy, separated by space - by default it is not set
   * `BACKENDS_PORT` Port to use when auto-discovering backends, or when `BACKENDS` are specified without port - by default `80`
+  * `BACKENDS_MODE` Backends mode - default `http`
   * `BALANCE` The algorithm used for load-balancing - default `roundrobin`
   * `SERVICE_NAMES` An optional prefix for services to be included when discovering services separated by space. - by default it is not set
   * `LOGGING` Override logging ip address:port - default is udp `127.0.0.1:514` inside container

haproxy/docker-entrypoint.sh

@@ -31,8 +31,8 @@ fi
 #enable cron logging
 service rsyslog restart
 
-#add crontab 
-crontab /var/crontab.txt 
+#add crontab
+crontab /var/crontab.txt
 chmod 600 /etc/crontab
 service cron restart
 
@@ -41,6 +41,7 @@ service cron restart
 echo "export PATH=$PATH"':$PATH' >> /etc/environment
 if [ ! -z "$BACKENDS" ]; then echo "export BACKENDS=\"$BACKENDS\""  >> /etc/environment; fi
 if [ ! -z "$BACKENDS_PORT" ]; then echo "export BACKENDS_PORT=\"$BACKENDS_PORT\""  >> /etc/environment; fi
+if [ ! -z "$BACKENDS_MODE" ]; then echo "export BACKENDS_MODE=\"$BACKENDS_MODE\""  >> /etc/environment; fi
 if [ ! -z "$BACKEND_NAME" ]; then echo "export BACKEND_NAME=\"$BACKEND_NAME\""  >> /etc/environment; fi
 if [ ! -z "$BALANCE" ]; then echo "export BALANCE=\"$BALANCE\""  >> /etc/environment; fi
 if [ ! -z "$COOKIES_ENABLED" ]; then echo "export COOKIES_ENABLED=\"$COOKIES_ENABLED\""  >> /etc/environment; fi
@@ -49,6 +50,7 @@ if [ ! -z "$FALL" ]; then echo "export FALL=\"$FALL\""  >> /etc/environment; fi
 if [ ! -z "$FAST_INTER" ]; then echo "export FAST_INTER=\"$FAST_INTER\""  >> /etc/environment; fi
 if [ ! -z "$FRONTEND_NAME" ]; then echo "export FRONTEND_NAME=\"$FRONTEND_NAME\""  >> /etc/environment; fi
 if [ ! -z "$FRONTEND_PORT" ]; then echo "export FRONTEND_PORT=\"$FRONTEND_PORT\""  >> /etc/environment; fi
+if [ ! -z "$FRONTEND_MODE" ]; then echo "export FRONTEND_MODE=\"$FRONTEND_MODE\""  >> /etc/environment; fi
 if [ ! -z "$HTTPCHK" ]; then echo "export HTTPCHK=\"$HTTPCHK\""  >> /etc/environment; fi
 if [ ! -z "$INTER" ]; then echo "export INTER=\"$INTER\""  >> /etc/environment; fi
 if [ ! -z "$LOGGING" ]; then echo "export LOGGING=\"$LOGGING\""  >> /etc/environment; fi

haproxy/src/configure.py

@@ -10,6 +10,7 @@
 
 FRONTEND_NAME = os.environ.get('FRONTEND_NAME', 'http-frontend')
 FRONTEND_PORT = os.environ.get('FRONTEND_PORT', '5000')
+FRONTEND_MODE = os.environ.get('FRONTEND_MODE', 'http')
 BACKEND_NAME = os.environ.get('BACKEND_NAME', 'http-backend')
 BALANCE = os.environ.get('BALANCE', 'roundrobin')
 SERVICE_NAMES = os.environ.get('SERVICE_NAMES', '')
@@ -19,6 +20,7 @@
 STATS_AUTH = os.environ.get('STATS_AUTH', 'admin:admin')
 BACKENDS = os.environ.get('BACKENDS', '').split(' ')
 BACKENDS_PORT = os.environ.get('BACKENDS_PORT', '80')
+BACKENDS_MODE = os.environ.get('BACKEND_MODE', 'http')
 LOGGING = os.environ.get('LOGGING', '127.0.0.1')
 LOG_LEVEL = os.environ.get('LOG_LEVEL', 'notice')
 TIMEOUT_CONNECT = os.environ.get('TIMEOUT_CONNECT', '5000')
@@ -44,7 +46,7 @@
 frontend_conf = Template("""
   frontend $name
     bind *:$port $accept_proxy
-    mode http
+    mode $mode
     default_backend $backend
 """)
 
@@ -55,7 +57,7 @@
     #header with a specific value for each backend server as its cookie value.
     backend_conf = Template("""
   backend $backend
-    mode http
+    mode $mode
     balance $balance
     option forwardfor
     http-request set-header X-Forwarded-Port %[dst_port]
@@ -71,7 +73,7 @@
     #cookies variable (is set to empty)
     backend_conf = Template("""
   backend $backend
-    mode http
+    mode $mode
     balance $balance
     option forwardfor
     http-request set-header X-Forwarded-Port %[dst_port]
@@ -93,6 +95,7 @@
 
 backend_conf = backend_conf.substitute(
     backend=BACKEND_NAME,
+    mode=BACKENDS_MODE,
     balance=BALANCE,
     httpchk=HTTPCHK,
     inter=INTER,
@@ -232,6 +235,7 @@
         frontend_conf.substitute(
             name=FRONTEND_NAME,
             port=FRONTEND_PORT,
+            mode=FRONTEND_MODE,
             backend=BACKEND_NAME,
             accept_proxy=accept_proxy
         )