logger

README

Deis Logger

Deis (pronounced DAY-iss) is an open source PaaS that makes it easy to deploy and manage applications on your own servers. Deis builds on Kubernetes to provide a lightweight, Heroku-inspired workflow.

A system logger for use in the Deis open source PaaS.

This Docker image is based on quay.io/deis/base image. You can see what version we are currently using in the Dockerfile

Description

The new v2 logger implementation has seen a simplification from the last rewrite. While it still uses much of that code it no longer depends on etcd. Instead, we will use kubernetes service discovery to determine where logger is running.

We have also decided to not use logspout as the mechanism to get logs from each container to the logger component. Now we will use fluentd which is a widely supported logging framework with hundreds of plugins. This will allow the end user to configure multiple destinations such as Elastic Search and other Syslog compatible endpoints like papertrail.

Configuration

The following environment variables can be used to configure logger:

Name	Default Value
STORAGE_ADAPTER	"redis"
NUMBER_OF_LINES (per app)	"1000"
AGGREGATOR_TYPE	"nsq"
DEIS_NSQD_SERVICE_HOST	""
DEIS_NSQD_SERVICE_PORT_TRANSPORT	4150
NSQ_TOPIC	logs
NSQ_CHANNEL	consume
NSQ_HANDLER_COUNT	30
AGGREGATOR_STOP_TIMEOUT_SEC	1
DEIS_LOGGER_REDIS_SERVICE_HOST	""
DEIS_LOGGER_REDIS_SERVICE_PORT	6379
DEIS_LOGGER_REDIS_PASSWORD	""
DEIS_LOGGER_REDIS_DB	0
DEIS_LOGGER_REDIS_PIPELINE_LENGTH	50
DEIS_LOGGER_REDIS_PIPELINE_TIMEOUT_SECONDS	1

Development

The only assumption this project makes about your environment is that you have a working docker host to build the image against.

Building binary and image

To build the binary and image run the following make command:

DEV_REGISTRY=quay.io IMAGE_PREFIX=myaccount make build
IMAGE_PREFIX=myaccount make build
DEV_REGISTRY=myhost:5000 make build

Pushing the image

The makefile assumes that you are pushing the image to a remote repository like quay or dockerhub. So you will need to supply the REGISTRY environment variable.

DEV_REGISTRY=quay.io IMAGE_PREFIX=myaccount make push
IMAGE_PREFIX=myaccount make push
DEV_REGISTRY=myhost:5000 make push

Kubernetes interactions

• make install - Install the recently built docker image into the kubernetes cluster
• make upgrade - Upgrade a currently installed image
• make uninstall - Uninstall logger from a kubernetes cluster

Architecture Diagram

                        ┌────────┐                            
                        │ Router │                  ┌────────┐
                        └────────┘                  │ Logger │
                            │                       └────────┘
                        Log file                        │    
                            │                           │    
                            ▼                           ▼    
┌────────┐             ┌─────────┐    logs/metrics   ┌─────┐
│App Logs│──Log File──▶│ fluentd │───────topics─────▶│ NSQ │
└────────┘             └─────────┘                   └─────┘
                                                        │    
                                                        │    
┌─────────────┐                                         │    
│ HOST        │                                         ▼    
│  Telegraf   │───┐                                ┌────────┐
└─────────────┘   │                                │Telegraf│
                  │                                └────────┘
┌─────────────┐   │                                    │    
│ HOST        │   │    ┌───────────┐                   │    
│  Telegraf   │───┼───▶│ InfluxDB  │◀────Wire ─────────┘    
└─────────────┘   │    └───────────┘   Protocol       
                  │          ▲                        
┌─────────────┐   │          │                        
│ HOST        │   │          ▼                        
│  Telegraf   │───┘    ┌──────────┐                   
└─────────────┘        │ Grafana  │                   
                       └──────────┘                                        

License

© 2016 Engine Yard, Inc.

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.