From 55da274ec380887fad2b8fbcdb396c7202be85b9 Mon Sep 17 00:00:00 2001
From: Rimantas Ragainis <rimantas@eskimi.com>
Date: Mon, 1 Jul 2019 10:30:29 +0300
Subject: [PATCH] Automate carbon-cache instance quantity

---
 README.md                      |  5 +++++
 conf/etc/run_once/carbon-cache | 18 ++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100755 conf/etc/run_once/carbon-cache

diff --git a/README.md b/README.md
index cba6dfa..0e65f04 100644
--- a/README.md
+++ b/README.md
@@ -165,6 +165,11 @@ Graphite stores tag information in a separate tag database (TagDB). Please check
 ## Collectd
 Use `COLLECTD=1` environment variable to enable local collectd instance
 
+## Carbon-cache
+If custom environment `GRAPHITE_CARBONLINK_HOSTS` variable is setup `carbon-cache` instances as daemons/services are [managed](./conf/etc/run_once/carbon-cache) based on the that, otherwise default instance (`127.0.0.1:7002`) is used.
+
+**Note**: if default port `7002` is used among the hosts, need to setup `CARBON_DISABLED=1` in the environment.
+
 ## Carbon-relay
 Use `RELAY=1` environment variable to enable carbon relay instance. Use `[relay]` section of carbon.conf to configure it.
 
diff --git a/conf/etc/run_once/carbon-cache b/conf/etc/run_once/carbon-cache
new file mode 100755
index 0000000..af5f80f
--- /dev/null
+++ b/conf/etc/run_once/carbon-cache
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+if [ -z "$GRAPHITE_CARBONLINK_HOSTS" ]; then
+    exit 0
+fi
+
+IFS=","
+for i in $GRAPHITE_CARBONLINK_HOSTS; do
+    INSTANCE_ID=$(echo $i | tr -d '[:space:]' | awk -F ':' '{print $3}')
+
+    [ -z $INSTANCE_ID ] && continue
+    S=/etc/service/carbon-$INSTANCE_ID
+    [ -d $S ] && continue
+    mkdir -p $S/log
+    sed "s/start/--instance=$INSTANCE_ID start/" /etc/service/carbon/run > $S/run
+    sed "s/carbon.log/carbon-$INSTANCE_ID.log/" /etc/service/carbon/log/run > $S/log/run
+    chmod +x $S/run $S/log/run
+done