On Wed, Apr 12, 2017 at 03:16:31PM +0200, Conrad Hoffmann wrote:
> Hi Olivier,
>
> I was very eager to try out your patch set, thanks a lot! However, after
> applying all of them (including the last three), it seems that using
> environment variables in the config is broken (i.e. ${VARNAME} does not get
> replaced with the value of the environment variable anymore). I am using
> the systemd-wrapper, but not systemd.
>
> Just from looking at the patches I couldn't make out what exactly might be
> the problem. I guess it could be either the wrapper not passing on its
> environment properly or haproxy not using it properly anymore. If you have
> any immediate ideas, let me know. I'll try to fully debug this when I can
> spare the time.
>
> Thanks a lot,
> Conrad
>
Hi Conrad,
You're right, that was just me being an idiot :)
Please replace 0007-MINOR-systemd-wrapper-add-support-for-passing-the-x-.patch
with the one attached, or just replace in src/haproxy-systemd-wrapper.c :
argv = calloc(4 + main_argc + nb_pid + 1 +
stats_socket != NULL ? 2 : 0, sizeof(char *));
by :
argv = calloc(4 + main_argc + nb_pid + 1 +
(stats_socket != NULL ? 2 : 0), sizeof(char *));
Regards,
Olivier
>From 526dca943b9cc89732c54bc43a6ce36e17b67890 Mon Sep 17 00:00:00 2001
From: Olivier Houchard <ohouch...@haproxy.com>
Date: Sun, 9 Apr 2017 16:28:10 +0200
Subject: [PATCH 7/9] MINOR: systemd wrapper: add support for passing the -x
option.
Make the systemd wrapper chech if HAPROXY_STATS_SOCKET if set.
If set, it will use it as an argument to the "-x" option, which makes
haproxy asks for any listening socket, on the stats socket, in order
to achieve reloads with no new connection lost.
---
contrib/systemd/haproxy.service.in | 2 ++
src/haproxy-systemd-wrapper.c | 10 +++++++++-
2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/contrib/systemd/haproxy.service.in
b/contrib/systemd/haproxy.service.in
index dca81a2..05bb716 100644
--- a/contrib/systemd/haproxy.service.in
+++ b/contrib/systemd/haproxy.service.in
@@ -3,6 +3,8 @@ Description=HAProxy Load Balancer
After=network.target
[Service]
+# You can point the environment variable HAPROXY_STATS_SOCKET to a stats
+# socket if you want seamless reloads.
Environment="CONFIG=/etc/haproxy/haproxy.cfg" "PIDFILE=/run/haproxy.pid"
ExecStartPre=@SBINDIR@/haproxy -f $CONFIG -c -q
ExecStart=@SBINDIR@/haproxy-systemd-wrapper -f $CONFIG -p $PIDFILE
diff --git a/src/haproxy-systemd-wrapper.c b/src/haproxy-systemd-wrapper.c
index f6a9c85..457f5bd 100644
--- a/src/haproxy-systemd-wrapper.c
+++ b/src/haproxy-systemd-wrapper.c
@@ -92,11 +92,15 @@ static void spawn_haproxy(char **pid_strv, int nb_pid)
pid = fork();
if (!pid) {
char **argv;
+ char *stats_socket = NULL;
int i;
int argno = 0;
/* 3 for "haproxy -Ds -sf" */
- argv = calloc(4 + main_argc + nb_pid + 1, sizeof(char *));
+ if (nb_pid > 0)
+ stats_socket = getenv("HAPROXY_STATS_SOCKET");
+ argv = calloc(4 + main_argc + nb_pid + 1 +
+ (stats_socket != NULL ? 2 : 0), sizeof(char *));
if (!argv) {
fprintf(stderr, SD_NOTICE "haproxy-systemd-wrapper:
failed to calloc(), please try again later.\n");
exit(1);
@@ -121,6 +125,10 @@ static void spawn_haproxy(char **pid_strv, int nb_pid)
argv[argno++] = "-sf";
for (i = 0; i < nb_pid; ++i)
argv[argno++] = pid_strv[i];
+ if (stats_socket != NULL) {
+ argv[argno++] = "-x";
+ argv[argno++] = stats_socket;
+ }
}
argv[argno] = NULL;
--
2.9.3
