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verticacheckd

verticacheckd is a web service that returns the state of the Vertica node it's running on by returning an HTTP 200 or 500 depending if it's UP or in any other state.

In detail, It will receive a request from an AWS ELB and we'll get the IP address from the HOST, then "shell out" and run Vertica /opt/vertica/bin/admintools -t view_cluster -x scrape the results of the given node through its IP address to see if it's UP or DOWN, and return a response through the endpoint that could either be HTTP 200 or 500.

Running

To run the application use the following command:

./verticacheckd

There are various arguments that can be used to modify the address, port, service-name, and HTTP read and write timeouts.

Current flag defaults:

./verticacheckd -h
  -address string
        HTTP address (default "127.0.0.1")
  -port int
        HTTP server listening port (default 3000)
  -service-name string
        Service name (default "verticacheckd")
  -timeout duration
        HTTP Read and Write timeout (default 5s)

Current state endpoints:

  • {service-name}/state this will return a global state for the node
  • {service-name}/dbs/{name}/state will return the state of a specific db given a name

Building and Releasing

To build the project we have set a make task that'll only build Darwin and Linux binaries for amd64. Remember to Bump the version inside the Makefile before releasing and that's about it.

make release

Tests

Running tests can be performed from the default make command or from the test target

make test