CentOS 7 kubectl is too old for the --output argument

[dafydd2277]

CentOS 8 with kubernetes-client-1.5.2-0.7.git269f928.el7.x86_64.rpm

installs a kubectl that does NOT include an "--output" argument. So,

$ kubectl version --client --output=json
Error: unknown flag: --output

Options:
  -c, --client=false: Client version only (no server required).
      --short=false: Print just the version number.

Usage:
  kubectl version [options]

Use "kubectl options" for a list of global command-line options (applies to all commands).

Error: unknown flag: --output

and minikube start ends with

E0331 21:01:18.230181   16751 start.go:383] kubectl info: exec: exit status 1

Since start.go is viewable, I go look at start.go line 383. That points me to the function showKubectlInfo at line 423 , and the exec.Command at line 436. From that, I'm concluding that the error is a false positive due to attempting a deprecated command argument.

[afbjorklund]

That package is for .el7, and seems to be using Kubernetes 1.5 ?

https://git.centos.org/rpms/kubernetes/blob/c7-extras/f/SPECS/kubernetes.spec

Please install a newer kubectl, or maybe use "minikube kubectl"

[afbjorklund]

Improved output:

❗  /usr/local/bin/kubectl is v1.5.2, which may be incompatible with Kubernetes v1.18.0.
💡  You can also use 'minikube kubectl -- get pods' to invoke a matching version

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.2", GitCommit:"08e099554f3c31f6e6f07b448ab3ed78d0520507", GitTreeState:"clean", BuildDate:"2017-01-12T04:57:25Z", GoVersion:"go1.7.4", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.0", GitCommit:"9e991415386e4cf155a24b1da15becaa390438d8", GitTreeState:"clean", BuildDate:"2020-03-25T14:50:46Z", GoVersion:"go1.13.8", Compiler:"gc", Platform:"linux/amd64"}

See: https://kubernetes.io/docs/setup/release/version-skew-policy/

[afbjorklund]

For upgrading on CentOS, you can use yum:

https://kubernetes.io/docs/tasks/tools/install-kubectl/#install-using-native-package-management