Retry 10 times when resolving fails in start.py scripts

core/dovecot/start.py

@@ -4,14 +4,26 @@ import jinja2
 import os
 import socket
 import glob
+import time
 
 convert = lambda src, dst: open(dst, "w").write(jinja2.Template(open(src).read()).render(**os.environ))
 
 # Actual startup script
+i = 0
+t = 10
+while True:
+	i += 1
+	try:
 		os.environ["FRONT_ADDRESS"] = socket.gethostbyname(os.environ.get("FRONT_ADDRESS", "front"))
 		os.environ["REDIS_ADDRESS"] = socket.gethostbyname(os.environ.get("REDIS_ADDRESS", "redis"))
 		if os.environ["WEBMAIL"] != "none":
 			os.environ["WEBMAIL_ADDRESS"] = socket.gethostbyname(os.environ.get("WEBMAIL_ADDRESS", "webmail"))
+	except socket.gaierror as err:
+		if i >= t:
+			raise
+		time.sleep(10)
+		continue
+	break
 
 for dovecot_file in glob.glob("/conf/*"):
     convert(dovecot_file, os.path.join("/etc/dovecot", os.path.basename(dovecot_file)))

core/postfix/start.py

@@ -5,11 +5,23 @@ import os
 import socket
 import glob
 import shutil
+import time
 
 convert = lambda src, dst: open(dst, "w").write(jinja2.Template(open(src).read()).render(**os.environ))
 
 # Actual startup script
+i = 0
+t = 10
+while True:
+	i += 1
+	try:
 		os.environ["FRONT_ADDRESS"] = socket.gethostbyname(os.environ.get("FRONT_ADDRESS", "front"))
+	except socket.gaierror as err:
+		if i >= t:
+			raise
+		time.sleep(10)
+		continue
+	break
 os.environ["HOST_ANTISPAM"] = os.environ.get("HOST_ANTISPAM", "antispam:11332")
 os.environ["HOST_LMTP"] = os.environ.get("HOST_LMTP", "imap:2525")
 

services/rspamd/start.py

@@ -4,11 +4,23 @@ import jinja2
 import os
 import socket
 import glob
+import time
 
 convert = lambda src, dst: open(dst, "w").write(jinja2.Template(open(src).read()).render(**os.environ))
 
 # Actual startup script
+i = 0
+t = 10
+while True:
+	i += 1
+	try:
 		os.environ["FRONT_ADDRESS"] = socket.gethostbyname(os.environ.get("FRONT_ADDRESS", "front"))
+	except socket.gaierror as err:
+		if i >= t:
+			raise
+		time.sleep(10)
+		continue
+	break
 if "HOST_REDIS" not in os.environ: os.environ["HOST_REDIS"] = "redis"
 
 for rspamd_file in glob.glob("/conf/*"):