From 0b256f0f2f63753229efa8d3e5b5a0809b8340dc Mon Sep 17 00:00:00 2001
From: EarthlingDavey <15802017+EarthlingDavey@users.noreply.github.com>
Date: Tue, 5 Nov 2024 17:00:47 +0000
Subject: [PATCH] fpm log slow queries and install `strace` on fpm containers.
 (#774)

---
 Dockerfile                  | 3 +++
 deploy/config/php-pool.conf | 8 ++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index 297d54366..1caa351c6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -22,6 +22,9 @@ ARG version_cron_alpine=3.19.1
 
 FROM ministryofjustice/wordpress-base-fpm:latest AS base-fpm
 
+RUN apk update && \
+    apk add strace
+
 # Make the Nginx user available in this container
 RUN addgroup -g 101 -S nginx; adduser -u 101 -S -D -G nginx nginx
 
diff --git a/deploy/config/php-pool.conf b/deploy/config/php-pool.conf
index 10753aaa8..47e3cc3fd 100644
--- a/deploy/config/php-pool.conf
+++ b/deploy/config/php-pool.conf
@@ -7,8 +7,8 @@ listen.owner = nginx;
 listen.group = nginx;
 listen.mode = 0660;
 
-ping.path=/ping
-ping.response=pong
+ping.path = /ping
+ping.response = pong
 
 pm = dynamic;
 pm.start_servers = 10;
@@ -18,6 +18,10 @@ pm.max_requests = 500;
 pm.max_children = 20;
 pm.status_path = /status;
 
+; Log a stack trace to stderr for slow queries.
+request_slowlog_timeout = 10s;
+slowlog = /proc/self/fd/2;
+
 [global]
 daemonize = no
 emergency_restart_threshold = 10;