How to secure access to Minio server with TLS
In this document, we will configure Minio servers with TLS certificates for both Linux and Windows.
- Download Minio server from here
2. Configure with existing certificates
Assuming that you are already having private and public certificates, you will need to copy them under
certs in your Minio config directory using the names
public.crt for key and public certificates respectively.
If the certificate is signed by a certificate authority,
public.crt should be the concatenation of the server's certificate, any intermediates, and the CA's root certificate.
3. Generate certificates
Minio supports only key/certificate in PEM format on Linux.
With Let's Encrypt
Please explore here
With generate_cert.go (self-signed certificate)
You need to download generate_cert.go which is a simple go tool for generating self-signed certificates but works for the most of cases.
generate_cert.go already provides SAN certificates with DNS and IP entries:
go run generate_cert.go -ca --host "10.10.0.3"
Generate the private key:
openssl genrsa -out private.key 2048
Generate the self-signed certificate:
openssl req -new -x509 -days 3650 -key private.key -out public.crt -subj "/C=US/ST=state/L=location/O=organization/CN=domain"
Minio only supports key/certificate in PEM format on Windows. Currently we do not yet support PFX certificates.
Download and decompress the Windows version of GnuTLS from here
Make sure to add extracted GnuTLS binary path to your system path.
setx path "%path%;C:\Users\MyUser\Downloads\gnutls-3.4.9-w64\bin"
You may need to restart your powershell console for this to take affect.
Run the following command to create
certtool.exe --generate-privkey --outfile private.key
Create a file
cert.cnf with all the necessary information to generate a certificate.
# X.509 Certificate options # # DN options # The organization of the subject. organization = "Example Inc." # The organizational unit of the subject. #unit = "sleeping dept." # The state of the certificate owner. state = "Example" # The country of the subject. Two letter code. country = "EX" # The common name of the certificate owner. cn = "Sally Certowner" # In how many days, counting from today, this certificate will expire. expiration_days = 365 # X.509 v3 extensions # DNS name(s) of the server dns_name = "localhost" # (Optional) Server IP address ip_address = "127.0.0.1" # Whether this certificate will be used for a TLS server tls_www_server # Whether this certificate will be used to encrypt data (needed # in TLS RSA ciphersuites). Note that it is preferred to use different # keys for encryption and signing. encryption_key
Generate public certificate
certtool.exe --generate-self-signed --load-privkey private.key --template cert.cnf --outfile public.crt
4. Install third-party CAs
Minio can be configured to connect to other servers, whether Minio nodes or servers like NATs, Redis. If these servers use certificates that are not registered in one of the known certificates authorities, you can make Minio server trust these CAs by dropping these certificates under Minio config path (
~/.minio/certs/CAs/ on Linux or
C:\Users\<Username>\.minio\certs\CAs on Windows).