updated ContainerPilot

Dockerfile

@@ -1,27 +1,63 @@
-FROM memcached:latest
+FROM memcached:1.4-alpine
 
+# Build-time metadata as defined at http://label-schema.org
+# with added usage described in https://microbadger.com/#/labels
+ARG BUILD_DATE
+ARG VCS_REF
+LABEL org.label-schema.build-date=$BUILD_DATE \
+    org.label-schema.docker.dockerfile="/Dockerfile" \
+    org.label-schema.name="Autopilot Pattern Memcached" \
+    org.label-schema.url="https://github.com/autopilotpattern/memcached" \
+    org.label-schema.vcs-ref=$VCS_REF \
+    org.label-schema.vcs-type="Git" \
+    org.label-schema.vcs-url="https://github.com/autopilotpattern/memcached"
+
+# Reset to root user to do some installs
 USER root
-RUN apt-get update \
-    && apt-get install -y \
-        netcat \
-        curl
 
-# Install ContainerPilot
+# Install packages
+RUN apk update && apk add \
+    bash \
+    curl \
+    netcat-openbsd \
+    && rm -rf /var/cache/apk/*
+
+# Add ContainerPilot and its configuration
 # Releases at https://github.com/joyent/containerpilot/releases
-ENV CONTAINERPILOT_VER 2.0.1
-RUN export CONTAINERPILOT_CHECKSUM=a4dd6bc001c82210b5c33ec2aa82d7ce83245154 \
-    && curl -Lso /tmp/containerpilot.tar.gz \
-        "https://github.com/joyent/containerpilot/releases/download/${CONTAINERPILOT_VER}/containerpilot-${CONTAINERPILOT_VER}.tar.gz" \
+ENV CONTAINERPILOT_VER 2.3.0
+ENV CONTAINERPILOT file:///etc/containerpilot.json
+
+RUN export CONTAINERPILOT_CHECKSUM=ec9dbedaca9f4a7a50762f50768cbc42879c7208 \
+    && curl --retry 7 --fail -Lso /tmp/containerpilot.tar.gz \
+         "https://github.com/joyent/containerpilot/releases/download/${CONTAINERPILOT_VER}/containerpilot-${CONTAINERPILOT_VER}.tar.gz" \
     && echo "${CONTAINERPILOT_CHECKSUM}  /tmp/containerpilot.tar.gz" | sha1sum -c \
     && tar zxf /tmp/containerpilot.tar.gz -C /usr/local/bin \
     && rm /tmp/containerpilot.tar.gz
 
-# Add ContainerPilot configuration
-COPY etc/containerpilot.json /etc/containerpilot.json
-ENV CONTAINERPILOT file:///etc/containerpilot.json
+# The our helper/glue scripts and configuration for this specific app
+COPY bin /usr/local/bin
+COPY etc /etc
+
+# Install Consul
+# Releases at https://releases.hashicorp.com/consul
+RUN export CONSUL_VERSION=0.6.4 \
+    && export CONSUL_CHECKSUM=abdf0e1856292468e2c9971420d73b805e93888e006c76324ae39416edcf0627 \
+    && curl --retry 7 --fail -vo /tmp/consul.zip "https://releases.hashicorp.com/consul/${CONSUL_VERSION}/consul_${CONSUL_VERSION}_linux_amd64.zip" \
+    && echo "${CONSUL_CHECKSUM}  /tmp/consul.zip" | sha256sum -c \
+    && unzip /tmp/consul -d /usr/local/bin \
+    && rm /tmp/consul.zip \
+    && mkdir /config
 
-# reset entrypoint from base image
+# Create empty directories for Consul config and data
+RUN mkdir -p /etc/consul \
+    && chown -R memcache /etc/consul \
+    && mkdir -p /var/lib/consul \
+    && chown -R memcache /var/lib/consul
+
+# Reset entrypoint from base image
 ENTRYPOINT []
+
+# Reset to memcache user to, um, run memcache
 USER memcache
 CMD ["/usr/local/bin/containerpilot", \
     "memcached", \

README.md

@@ -3,8 +3,8 @@
 
 [![DockerPulls](https://img.shields.io/docker/pulls/autopilotpattern/memcached.svg)](https://registry.hub.docker.com/u/autopilotpattern/memcached/)
 [![DockerStars](https://img.shields.io/docker/stars/autopilotpattern/memcached.svg)](https://registry.hub.docker.com/u/autopilotpattern/memcached/)
-[![ImageLayers](https://badge.imagelayers.io/autopilotpattern/memcached:latest.svg)](https://imagelayers.io/?images=autopilotpattern/memcached:latest)
-[![Join the chat at https://gitter.im/autopilotpattern/general](https://badges.gitter.im/autopilotpattern/general.svg)](https://gitter.im/autopilotpattern/general)
+[![MicroBadger version](https://images.microbadger.com/badges/version/autopilotpattern/memcached.svg)](http://microbadger.com/#/images/autopilotpattern/memcached)
+[![MicroBadger commit](https://images.microbadger.com/badges/commit/autopilotpattern/memcached.svg)](http://microbadger.com/#/images/autopilotpattern/memcached)
 
 ### Usage
 Include this image in your Docker Compose project, query Consul for it's IP address and use it in your configurations, easily done via [Consul-Template](https://github.com/hashicorp/consul-template). The default ContainerPilot configuration talks to Consul and assumes the IP address to access consule is passed to the container in an envrionment varible, $CONSUL
@@ -33,3 +33,12 @@ $memcached_servers = array(
 );
 {{ end }}
 ```
+
+### Building
+
+This image implements [microbadger.com](https://microbadger.com/#/labels) label schema, but those labels require additional build args:
+
+```
+docker build --build-arg BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"` \
+               --build-arg VCS_REF=`git rev-parse --short HEAD` .
+```

bin/sensor.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+set -e
+
+help() {
+    echo 'Uses cli tools free and top to determine current CPU and memory usage'
+    echo 'for the telemetry service.'
+}
+
+# count of memcached evictions
+evictions() {
+    (>&2 echo "evictions check fired")
+    local evictions=$(echo -e 'stats\nquit' | nc 127.0.0.1 11211 | awk '/evictions/{print $3}')
+    echo ${evictions}
+}
+
+# memory usage in percent
+sys_memory() {
+    # awk oneliner to get memory usage
+    # free -m | awk 'NR==2{printf "Memory Usage: %s/%sMB (%.2f%%)\n", $3,$2,$3*100/$2 }'
+    # output:
+    # Memory Usage: 15804/15959MB (99.03%)
+    (>&2 echo "sys memory check fired")
+    local memory=$(free -m | awk 'NR==2{printf "%.2f", $3*100/$2 }')
+    echo ${memory}
+}
+
+# cpu load
+sys_cpu() {
+    # oneliner to display cpu load
+    # top -bn1 | grep load | awk '{printf "CPU Load: %.2f\n", $(NF-2)}'
+    (>&2 echo "sys cpu check fired")
+    local cpuload=$(top -bn1 | grep load | awk '{printf "%.2f", $(NF-2)}')
+    echo ${cpuload}
+}
+
+cmd=$1
+if [ ! -z "$cmd" ]; then
+    shift 1
+    $cmd "$@"
+    exit
+fi
+
+help

etc/containerpilot.json

@@ -1,5 +1,5 @@
 {
-  "consul": "{{ .CONSUL }}:8500",
+  "consul": "{{ if .CONSUL_AGENT }}localhost{{ else }}{{ .CONSUL }}{{ end }}:8500",
   "services": [
     {
       "name": "memcached",
@@ -8,5 +8,42 @@
       "poll": 10,
       "ttl": 25
     }
-  ]
+  ],
+  "coprocesses": [{{ if .CONSUL_AGENT }}
+    {
+      "command": ["/usr/local/bin/consul", "agent",
+                  "-data-dir=/var/lib/consul",
+                  "-config-dir=/etc/consul",
+                  "-rejoin",
+                  "-retry-join", "{{ .CONSUL }}",
+                  "-retry-max", "10",
+                  "-retry-interval", "10s"],
+      "restarts": "unlimited"
+    }{{ end }}],
+  "telemetry": {
+    "port": 9090,
+    "sensors": [
+      {
+        "name": "memcached_evictions",
+        "help": "count of keys evicted due to memory exhaustion",
+        "type": "gauge",
+        "poll": 5,
+        "check": ["/usr/local/bin/sensor.sh", "evictions"]
+      },
+      {
+        "name": "memcached_sys_memory_percent",
+        "help": "percentage of memory used",
+        "type": "gauge",
+        "poll": 5,
+        "check": ["/usr/local/bin/sensor.sh", "sys_memory"]
+      },
+      {
+        "name": "memcached_sys_cpu_load",
+        "help": "cpu load",
+        "type": "gauge",
+        "poll": 5,
+        "check": ["/usr/local/bin/sensor.sh", "sys_cpu"]
+      }
+    ]
+  }
 }