Use DNS for Elasticsearch

cluster/saltbase/salt/fluentd-es/fluentd-es.manifest

@@ -6,9 +6,6 @@ containers:
     volumeMounts:
       - name: containers
         mountPath: /var/lib/docker/containers
-      - name: hosts
-        mountPath: /outerhost
-        readOnly: true
       - name: varlog
         mountPath: /varlog
 volumes:
@@ -20,7 +17,3 @@ volumes:
     source:
       hostDir:
         path: /var/log
-  - name: hosts
-    source:
-      hostDir:
-        path: /etc/hosts

contrib/logging/fluentd-es-image/Dockerfile

@@ -33,10 +33,5 @@ RUN /usr/sbin/td-agent-gem install fluent-plugin-elasticsearch
 # Copy the Fluentd configuration file.
 COPY td-agent.conf /etc/td-agent/td-agent.conf
 
-# Copy a script that determines the name of the host machine
-# and then patch the Fluentd configuration files and then
-# run Fluentd in the foreground.
-ADD run.sh /run.sh
-
-# Always run the this setup script.
-ENTRYPOINT ["/run.sh"]
+# Run the Fluentd service.
+CMD /usr/sbin/td-agent -qq > /var/log/td-agent/td-agent.log

contrib/logging/fluentd-es-image/run.sh

-#!/bin/bash
-
-# Copyright 2014 Google Inc. All rights reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# WARNING! HORRIBLE HACK! We expect /outerhost to be mapped to
-# the enclosing /etc/host file so we can determine the name of
-# the host machine (super fragile). This is a temporary hack until
-# service IPs are done.
-OUTER_HOST=`tail -n 1 /outerhost | awk '{print $3}'`
-
-# WARNING! HORRIBLE HACK! We expect /outerhost to be mapped to
-# the enclosing /etc/host file so we can determine the name of
-# the host machine (super fragile). This is a temporary hack until
-# service IPs are done.
-# Adjust the name of the host machine for %ES_HOST%. HACK!
-sed -i -e "s/\%ES_HOST\%/${OUTER_HOST}/" /etc/td-agent/td-agent.conf
-/usr/sbin/td-agent -qq "$@"

contrib/logging/fluentd-es-image/td-agent.conf

@@ -47,10 +47,14 @@
    type elasticsearch
    log_level info
    include_tag_key true
-   host %ES_HOST%
+   host elasticsearch.default
    port 9200
    logstash_format true
    flush_interval 5s
+   # Never wait longer than 5 minutes between retries.
+   max_retry_wait 300
+   # Disable the limit on the number of retries (retry forever).
+   disable_retry_limit
 </match>
 
 <source>
@@ -65,8 +69,12 @@
    type elasticsearch
    log_level info
    include_tag_key true
-   host %ES_HOST%
+   host elasticsearch.default
    port 9200
    logstash_format true
    flush_interval 5s
+   # Never wait longer than 5 minutes between retries.
+   max_retry_wait 300
+   # Disable the limit on the number of retries (retry forever).
+   disable_retry_limit
 </match>