Initial Commit

.gitignore

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+.idea
+*~

Dockerfile

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+FROM haproxy:1.8-alpine
+
+RUN apk add --no-cache bash
+
+COPY entrypoint.sh /
+
+ENTRYPOINT [ "/entrypoint.sh" ]
+CMD ["haproxy", "-f", "/usr/local/etc/haproxy/haproxy.cfg"]

LICENSE

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+MIT License
+
+Copyright (c) 2018 Joao Gilberto Magalhães
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Easy HAProxy 
+
+This Docker image will create dynamically the `haproxy.cfg` based on the arguments defined in the command line.
+
+## Features
+
+- Enable or disable Stats on port 1936 with custom password
+- Add a mapping from a host to another
+
+## Usages
+
+The most common use is to use on Docker Swarm environment when you don't want to expose 
+the container ports and use a Load Balance to deliver to this component in the same 
+overlay network
+
+## Basic Usage
+
+You have to define 3 variables (LB_STATS_USER, LB_STATS_PASS, LB_HOSTS). 
+
+Example:
+- HAProxy with statistics and password "mypassowrd" for the user "admin"
+- Domain `my.domain.com` routing to container/host `container1` on port 8080
+- Domain `other.domain.com` routing to container/host `other` on port 7000
+
+
+```bash
+docker run \ 
+    -e LB_STATS_USER=admin \
+    -e LB_STATS_PASS=mypassword \
+    -e LB_HOSTS="my.domain.com container1:8080 other.domain.com other:7000" \
+    --name easy-haproxy-instance \
+    -t -d byjg/easy-haproxy
+```
+
+
+## Build
+
+```
+docker build -t byjg/easy-haproxy .
+```

entrypoint.sh

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+#!/bin/bash
+set -e
+
+echo " ______                  _    _          _____                     "
+echo "|  ____|                | |  | |   /\   |  __ \                    "
+echo "| |__   __ _ ___ _   _  | |__| |  /  \  | |__) | __ _____  ___   _ "
+echo "|  __| / _\` / __| | | | |  __  | / /\ \ |  ___/ '__/ _ \ \/ / | | |"
+echo "| |___| (_| \__ \ |_| | | |  | |/ ____ \| |   | | | (_) >  <| |_| |"
+echo "|______\__,_|___/\__, | |_|  |_/_/    \_\_|   |_|  \___/_/\_\\__, |"
+echo "                  __/ |                                       __/ |"
+echo "                 |___/                                       |___/ "
+echo ""
+
+defaults() {
+echo "
+defaults
+    timeout connect    3s
+    timeout client    10s
+    timeout server    10m
+
+global
+    log 127.0.0.1 local0 notice
+    maxconn 2000
+"
+}
+
+stats() {
+echo "
+frontend stats
+    bind *:1936
+    mode http
+    stats enable
+    stats hide-version
+    stats realm Haproxy\ Statistics
+    stats uri /
+    stats auth $1:$2
+#    acl is_proxystats hdr_dom(host) -i some.host.com
+#    default_backend srv_stats
+    use_backend srv_stats if is_proxystats
+
+backend srv_stats
+    mode http
+    server Local 127.0.0.1:1936
+"
+}
+
+frontend() {
+    echo "
+frontend http_in
+    bind *:80
+    mode http
+"
+
+    COUNT=1
+    for FEACL in `echo $1`
+    do
+        echo "    acl is_rule_$COUNT hdr_dom(host) -i -m end $FEACL"
+        COUNT=$((COUNT + 1))
+    done
+    echo
+    COUNT=1
+    for FEACL in `echo $1`
+    do
+        echo "    use_backend srv_80_$COUNT if is_rule_$COUNT"
+        COUNT=$((COUNT + 1))
+    done
+}
+
+backend () {
+    COUNT=1
+    for BESRV in `echo $1`
+    do
+        echo "
+backend srv_80_$COUNT
+    balance roundrobin
+    mode http
+    option forwardfor
+    http-request set-header X-Forwarded-Port %[dst_port]
+    http-request add-header X-Forwarded-Proto https if { ssl_fc }
+"
+        echo "    server srv $BESRV check weight 1"
+        COUNT=$((COUNT + 1))
+    done
+}
+
+
+HAPROXY_CFG="/usr/local/etc/haproxy/haproxy.cfg"
+FRONTEND=""
+BACKEND=""
+TURN="FB"
+for LB_HOST in `echo ${LB_HOSTS}`;
+do
+    if [ "$TURN" == "FB" ]
+    then
+        FRONTEND="$FRONTEND $LB_HOST"
+        TURN="BE"
+        continue
+    fi
+
+    if [ "$TURN" == "BE" ]
+    then
+        BACKEND="$BACKEND $LB_HOST"
+        TURN="FB"
+        continue
+    fi
+done
+
+# Write
+defaults > $HAPROXY_CFG
+if [ ! -z "${LB_STATS_USER}" ]
+then
+    stats ${LB_STATS_USER} ${LB_STATS_PASS} >> $HAPROXY_CFG
+fi
+frontend "$FRONTEND" >> $HAPROXY_CFG
+backend "$BACKEND" >> $HAPROXY_CFG
+
+/docker-entrypoint.sh "$@"
+