kubercert is the certbot for kubernetes
First install Go.
If you just want to install the binary to your current directory and don't care about the source code, run
GOBIN="$(pwd)" go install github.com/grengojbo/kubercert@latest$ kubercert --help
Usage of kubercert
kubercert [options] <host>...
Options:
-expires duration
error if cert expiration time is less than this; use 0 to disable (default 168h0m0s)
-output mode
output mode: text, json, or none (default text)
-port int
Port to look for TLS certificates on (default 443)
-timeout duration
time out on TCP dialing (default 5s)
-verbose
log connections
$ kubercert example.com
Host: example.com:443
Certs:
Issuer: DigiCert SHA2 High Assurance Server CA
Subject: www.example.org
Not Before: Nov 3, 2015 12:00 AM
Not After: Nov 28, 2018 12:00 PM
DNS names: www.example.org example.com example.edu example.net example.org www.example.com www.example.edu www.example.net
$ kubercert -output json -verbose example.com
2018/11/04 19:19:15 connecting to example.com:443
[
{
"Host": "example.com",
"Port": 443,
"Certs": [
{
// snip many fields!
}
]
}
]
$ kubercert -output none -expires 24h example.com
$ kubercert -output none -expires 480h example.com
Problem running kubercert: cert for www.example.org expires too soon: 2018-11-28T12:00:00Z less than 480h0m0s away