kubetail

v1.0.0 Released https://github.com/jbvmio/kubetail/releases

kubetail is a utility written in go enabling a straight forward way to immediately begin tailing logs from multiple Kubernetes pods using whitelist, blacklist terms if desired. Searches and returns results using podnames as a wildcard search, optionally adding a prefixed header.

All pods that contain the search terms as a substring will be returned.

Examples:

  kubetail -i apache nginx                 // Tails logs from pods containing "apache" or "nginx", adding an id header.
  kubetail -i pod1 pod2 --tail 20          // Tails pod1 and pod2 beginning with the last 20 lines.
  kubetail --in-cluster pod1               // Use --in-cluster flag if running within a Pod itself.

Using white-list (--grep) and black-list (--vgrep) filters:

  kubetail -i apache nginx --vgrep 'GET,connection refused'
  kubetail -i apache nginx --grep "example.com,mysite.com" --vgrep POST

The latter will tail logs from any pod with "apache" or "nginx" in it's name, filtering for anything containing either example.com or mysite.com but not containing the word POST.

Filter order is determined by the order entered on the command line:

   kubetail -i apache nginx --grep example.com --vgrep POST  // Filters for lines containing example.com first, then filters out any lines containing POST
   kubetail -i apache nginx --vgrep POST --grep example.com  // Filters out any lines containing POST first, then filters for lines containing example.com

Flags:

      --in-cluster      enables kubetail to be used inside a pod.
  -i, --id              display the pod name as a header along with the output.
      --grep strings    only display lines matching the specified text. Use a comma seperated string for multiple args.
      --vgrep strings   exclude any lines matching the specified text. Use a comma seperated string for multiple args.
      --tail int        start tail with defined no. of lines. (default 2)
  -h, --help            help for kubetail