From 15d979e9c683358f6b1dff628749732b6df199dc Mon Sep 17 00:00:00 2001
From: Alban Bronisz <alban.bronisz@gmail.com>
Date: Sat, 13 Feb 2021 17:05:42 +0100
Subject: [PATCH] Add export script

---
 .gitignore           |  1 +
 README.md            | 34 ++++++++++++++++++++++++++++++++++
 save_docker_stats.sh | 28 ++++++++++++++++++++++++++++
 3 files changed, 63 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 README.md
 create mode 100755 save_docker_stats.sh

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..497d582
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+stats.json
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..07a8836
--- /dev/null
+++ b/README.md
@@ -0,0 +1,34 @@
+
+Ultra-light docker monitor
+=========================
+
+This light tool permits:
+ - to export docker container memory usage in a JSON file `stats.json`
+ - display curves of the memory usages using the JSON file
+
+The export and the display are two different parts. This allow to run the display in another machine.
+
+
+
+Setup the stats export
+----------------------
+
+To add it to the cron tab:
+
+	crontab -e
+
+The add new line (to run the check once per hour)
+
+	*/10 * * * * /path.io/docker-stats-histo/save_docker_stats.sh >>/dev/null  2>&1
+
+
+**Note:**
+ - Normaly cron send task outputs (echo) via mail. As the MTA (Mail Transfert Agent), may not be set up,
+the crontab line redirect the outputs into `/dev/null`. Can also be a path to a log file.
+ - No sudo is needed, crontab is called with current user.
+
+
+Display stats
+-------------
+
+To be done...
diff --git a/save_docker_stats.sh b/save_docker_stats.sh
new file mode 100755
index 0000000..ba288c5
--- /dev/null
+++ b/save_docker_stats.sh
@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+set -eu
+
+
+SCRIPT_PATH="$( cd "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
+OUTPUT="stats.json"
+
+# Move in repo folder
+pushd ${SCRIPT_PATH} > /dev/null
+
+
+# If file does not exist, create it with JSON bracket
+if [ ! -f $OUTPUT ]; then
+    echo "[" >> ${OUTPUT}
+fi
+
+# Append stat data
+now=$(date -Iseconds)
+echo "{" >> ${OUTPUT}
+echo "	\"data\": \"${now}\"" >> ${OUTPUT}
+/snap/bin/docker stats --no-stream --format "	,\"{{.Name}}\": \"{{.MemUsage}}\"" >> ${OUTPUT}
+
+echo "}," >> ${OUTPUT}
+
+
+# Back to  original path
+popd