Fixed SO_REUSEPORT not supported by Linux <3.9

Change-Id: If2dec4555dc436c1b16d7298c6f37d99e0e48cea
Closes-Bug: 1451691

1 files changed, 14 insertions, 2 deletions

diff --git a/designate/dnsutils.py b/designate/dnsutils.py
index f3c0fbb..460de7f 100644
--- a/designate/dnsutils.py
+++ b/designate/dnsutils.py
@@ -247,8 +247,14 @@ def bind_tcp(host, port, tcp_backlog):
              {'host': host, 'port': port})
     sock_tcp = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
     sock_tcp.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-    sock_tcp.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
     sock_tcp.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
+
+    # NOTE: Linux supports socket.SO_REUSEPORT only in 3.9 and later releases.
+    try:
+        sock_tcp.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
+    except Exception:
+        pass
+
     sock_tcp.setblocking(True)
     sock_tcp.bind((host, port))
     sock_tcp.listen(tcp_backlog)
@@ -262,7 +268,13 @@ def bind_udp(host, port):
              {'host': host, 'port': port})
     sock_udp = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
     sock_udp.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-    sock_udp.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
+
+    # NOTE: Linux supports socket.SO_REUSEPORT only in 3.9 and later releases.
+    try:
+        sock_udp.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
+    except Exception:
+        pass
+
     sock_udp.setblocking(True)
     sock_udp.bind((host, port))