Preparing for reloading haproxy

Dockerfile

@@ -1,12 +1,24 @@
 FROM haproxy:1.9-alpine
 
-RUN apk add --no-cache bash python3 py-yaml
+WORKDIR /root
 
-COPY entrypoint.* /
-COPY conf.d /etc/haproxy/conf.d
-COPY assets/errors-custom/* /etc/haproxy/errors-custom/
+RUN apk add --no-cache bash python3 py-yaml supervisor docker
+
+COPY requirements.txt /root
 RUN pip3 install --upgrade pip \
  && pip install -r requirements.txt
 
-ENTRYPOINT [ "/entrypoint.sh" ]
-CMD ["haproxy", "-f", "/etc/haproxy/haproxy.cfg"]
+
+COPY haproxy.cfg /etc/haproxy/haproxy.cfg
+COPY conf.d /etc/haproxy/conf.d
+COPY assets/errors-custom/* /etc/haproxy/errors-custom/
+COPY assets/supervisord.conf /etc/supervisord.conf
+COPY assets/crontab /etc/crontabs/root
+
+COPY scripts/exit-event-listener.py /exit-event-listener.py
+COPY scripts/haproxy.sh /haproxy.sh
+COPY scripts/haproxy-reload.sh /haproxy-reload.sh
+
+
+#CMD ["haproxy", "-f", "/etc/haproxy/haproxy.cfg"]
+CMD ["/usr/bin/supervisord",  "-n",  "-c", "/etc/supervisord.conf" ]

README.md

@@ -24,6 +24,7 @@ docker run \
     -e HAPROXY_PASSWORD=password \
     -e HAPROXY_STATS_PORT=1936 \ 
     -e REFRESH_STATE=1 \
+    -v /var/run/docker.sock:/var/run/docker.sock \
     -d byjg/easy-haproxy
 ```
 

assets/crontab

@@ -0,0 +1,9 @@
+# do daily/weekly/monthly maintenance
+# min   hour    day     month   weekday command
+*/15    *       *       *       *       run-parts /etc/periodic/15min
+0       *       *       *       *       run-parts /etc/periodic/hourly
+0       2       *       *       *       run-parts /etc/periodic/daily
+0       3       *       *       6       run-parts /etc/periodic/weekly
+0       5       1       *       *       run-parts /etc/periodic/monthly
+*       *       *       *       *       /haproxy-reload.sh
+

assets/supervisord.conf

@@ -0,0 +1,45 @@
+[unix_http_server]
+file=/dev/shm/supervisor.sock   ; (the path to the socket file)
+
+[supervisord]
+logfile=/tmp/supervisord.log ; (main log file;default $CWD/supervisord.log)
+logfile_maxbytes=50MB        ; (max main logfile bytes b4 rotation;default 50MB)
+logfile_backups=10           ; (num of main logfile rotation backups;default 10)
+loglevel=info                ; (log level;default info; others: debug,warn,trace)
+pidfile=/tmp/supervisord.pid ; (supervisord pidfile;default supervisord.pid)
+nodaemon=false               ; (start in foreground if true;default false)
+minfds=1024                  ; (min. avail startup file descriptors;default 1024)
+minprocs=200                 ; (min. avail process descriptors;default 200)
+user=root                    ;
+
+; the below section must remain in the config file for RPC
+; (supervisorctl/web interface) to work, additional interfaces may be
+; added by defining them in separate rpcinterface: sections
+[rpcinterface:supervisor]
+supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
+
+[supervisorctl]
+serverurl=unix:///dev/shm/supervisor.sock ; use a unix:// URL  for a unix socket
+
+[program:haproxy]
+command = /haproxy.sh
+autostart=true
+autorestart=false
+priority=5
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+
+[program:crond]
+command=/usr/sbin/crond -f
+autostart=true
+autorestart=false
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+
+[eventlistener:exit_on_any_fatal]
+command=/exit-event-listener.py
+events=PROCESS_STATE_FATAL,PROCESS_STATE_EXITED,PROCESS_STATE_STOPPED

scripts/exit-event-listener.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+
+import os
+import signal
+
+from supervisor import childutils
+
+def main():
+    while True:
+        headers, payload = childutils.listener.wait()
+        childutils.listener.ok()
+        events = ['PROCESS_STATE_FATAL', 'PROCESS_STATE_EXITED', 'PROCESS_STATE_STOPPED']
+        if not (headers['eventname'] in events):
+            continue
+        os.kill(os.getppid(), signal.SIGTERM)
+
+if __name__ == "__main__":
+    main()

scripts/haproxy-reload.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+echo "Reloading..."
+
+/usr/local/sbin/haproxy -W -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid -x /var/run/haproxy.sock -sf $(cat /run/haproxy.pid) &

scripts/haproxy.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+/usr/local/sbin/haproxy -W -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid -S /var/run/haproxy.sock
+
+while true; do
+    sleep 60
+done