Building The Container

git clone git@github.com:mkuenstner/docker-watcher.git
cd docker/watcher
docker build -t=watcher .

Launch The Container

docker run -i -t -p 9200:9200  watcher

Watcher

Cluster Health

Checks the health of the cluster every 10s and alarm's if the status is red.

PUT /_watcher/watch/cluster_health_watch
{
   "trigger": {
      "schedule": {
         "interval": "10s"
      }
   },
   "input": {
      "http": {
         "request": {
            "host": "localhost",
            "port": 9200,
            "path": "/_cluster/health"
         }
      }
   },
   "condition": {
      "compare": {
         "ctx.payload.status": {
            "eq": "red"
         }
      }
   },
   "actions": {
      "send_email": {
         "email": {
            "to": "root@localhost",
            "subject": "Cluster Status Warning",
            "body": "Cluster status is RED"
         }
      }
   }
}

Amount of Documents in an Index

Checks the amount of documents in the comicbook-index and alarms, if less than 100 documents are present.

PUT /_watcher/watch/comicbooks
{
   "trigger": {
      "schedule": {
         "interval": "10s"
      }
   },
   "input": {
      "http": {
         "request": {
            "host": "localhost",
            "port": 9200,
            "path": "/comicbook/_count"
         }
      }
   },
   "condition": {
      "compare": {
         "ctx.payload.count": {
            "lte": 100
         }
      }
   },
   "actions": {
      "send_email": {
         "email": {
            "to": "root@localhost",
            "subject": "Amount of Documents in Comicbooks",
            "body": "Less than 100 Docs in Index present"
         }
      }
   }
}

Delete some documents to test the Watcher:

DELETE /comicbook/_query
{
    "query": {
        "wildcard": {
            "name": "*n"
        }
    }
}

Mails are being sent to root@localhost and can easly be viewed using mutt.

Status

GET /.watch_history*/_search
{
  "sort" : [
    { "result.execution_time" : "desc" }
  ]
}

List all Watches

GET .watches/_search
{
   "fields": [],
   "query": {
      "match_all": {}
   }
}

Delete a Watch

DELETE /_watcher/watch/comicbooks

mkuenstner/docker-watcher