This repository is a simple demo to showcase a couple of things using Docker.

1. Sending logs securely to Graylog using the syslog tcp+tls logging driver
2. Using Consul and Registrator to monitor services dynamically

1. Generate the syslog certs: cd ./docker-log-alert/tls/syslog/ and then run ./gen_certs.sh (follow the prompts)
2. EXTERNAL_IP=<host IP> docker-compose up -d ... the EXTERNAL_IP is IP or address this is running on. For the client-side Graylog API calls.
3. Connect to graylog: http://<EXTERNAL_IP>:9001 User: admin Pass: admin
   1. Go to "System/Input" -> "Content Packs" -> "Import Content Pack"
   2. Import the ./docker-log-alert/graylog/content_pack_nginx.json content pack
   3. Under "Content Packs" click on "Web Servers" and then "Apply Content Pack"
4. cd alerts
5. export CERT_PATH=$(pwd | sed 's/\/alerts//')
6. docker-compose up -d
7. Build the curl script image
   1. From the alerts directory
   2. docker build --rm -t consul-curl .
   3. docker run --rm --net=host consul-curl
8. Scale the app docker-compose scale app=10
9. Simulate a failure
   1. cd nginx
   2. echo fail > status or chmod 000 status
10. In about 20s you should get an alert in Slack
11. Investigate the error in Graylog by searching for NOT response_status: 200