Use case 3: Enabling Auto-TLS with Existing Certificates
You can manually generate the certificates signed by an existing Root CA and upload
them to Cloudera Manager
If you have an existing cluster where you need to enable Auto-TLS, or if there is a need to
get the host certificates signed individually by the company’s existing CA, you can use this
option of enabling Auto-TLS with existing certificates. This option adds operational overhead
of generating certificates for any new hosts and uploading to Cloudera Manager through an API
request. In this option, certificates signed by CA are staged and Auto-TLS is enabled by
calling a Cloudera Manager API.
Create the Auto-TLS directory /opt/cloudera/AutoTLS in the Cloudera Manager server. The
directory must be owned by the cloudera-scm user.
Create a public/private key for each host and generate the corresponding Certificate
Signing request (CSR). Have these CSRs signed by the company’s Certificate Authority
(CA).
Prepare all the certificates signed by the company’s CA on the Cloudera Manager server.
In this example, all the certificates are located under the /tmp/auto-tls directory. The
password used for keystore and truststore are present in key.pwd and truststore.pwd files
respectively.
Refer the example API given below. Customize this API to match the deployment that has
been set up and then execute the
API.
curl -i -v -uadmin:admin -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' -d '{
"location" : "/opt/cloudera/AutoTLS",
"customCA" : true,
"interpretAsFilenames" : true,
"cmHostCert" : "/tmp/auto-tls/certs/ccycloud-7.vcdp71.root.hwx.site.pem",
"cmHostKey" : "/tmp/auto-tls/keys/ccycloud-7.vcdp71.root.hwx.site-key.pem",
"caCert" : "/tmp/auto-tls/ca-certs/cfssl-chain-truststore.pem",
"keystorePasswd" : "/tmp/auto-tls/keys/key.pwd",
"truststorePasswd" : "/tmp/auto-tls/ca-certs/truststore.pwd",
"trustedCaCerts" : "/tmp/auto-tls/ca-certs.pem", //This is a path to a PEM file on the Cloudera Manager host which contains
a list of CA certificates that should be imported into the truststores of all hosts. This is an optional field.
"hostCerts" : [ {
"hostname" : "ccycloud-7.vcdp71.root.hwx.site",
"certificate" : "/tmp/auto-tls/certs/ccycloud-7.vcdp71.root.hwx.site.pem",
"key" : "/tmp/auto-tls/keys/ccycloud-7.vcdp71.root.hwx.site-key.pem"
}, {
"hostname" : "ccycloud-3.vcdp71.root.hwx.site",
"certificate" : "/tmp/auto-tls/certs/ccycloud-3.vcdp71.root.hwx.site.pem",
"key" : "/tmp/auto-tls/keys/ccycloud-3.vcdp71.root.hwx.site-key.pem"
}, {
"hostname" : "ccycloud-2.vcdp71.root.hwx.site",
"certificate" : "/tmp/auto-tls/certs/ccycloud-3.vcdp71.root.hwx.site.pem",
"key" : "/tmp/auto-tls/keys/ccycloud-3.vcdp71.root.hwx.site-key.pem"
}, {
"hostname" : "ccycloud-1.vcdp71.root.hwx.site",
"certificate" : "/tmp/auto-tls/certs/ccycloud-1.vcdp71.root.hwx.site.pem",
"key" : "/tmp/auto-tls/keys/ccycloud-1.vcdp71.root.hwx.site-key.pem"
} ],
"configureAllServices" : "true",
"sshPort" : 22,
"userName" : "root",
"password" : "cloudera"
}' 'http://ccycloud-7.vcdp71.root.hwx.site:7180/api/v41/cm/commands/generateCmca' ////This link is valid if you have
not enabled TLS in the Cloudera Manager UI. If you enable TLS for the same deployment in the Cloudera Manager UI later,
the port number and the protocol changes for the API calls and for accessing the link from a browser. In such a scenario,
the correct API call is as follows: https://ccycloud-7.vcdp71.root.hwx.site:7183/api/v41/cm/commands/generateCmca.
If
a new deployment is set up without TLS encryption, the API uses HTTP and port 7180. If
you are converting the deployment to an Auto-TLS setup from an existing Manual TLS
setup, the Cloudera Manager UI is converted to HTTPS. In such cases, the URL for the API
calls has to be modified.
Table 1. JSON file key properties
Property
Data type
Description
customCA
boolean
Option to generate an internal Cloudera Manager CA (false) or use
user-provided certificates (true). When set to true (user-provided
certificates), the following other arguments must be given: * cmHostCert *
cmHostKey * caCert * keystorePasswd * truststorePasswd
cmHostCert
string
The certificate for the Cloudera Manager host in PEM format. Only used if
customCA == true.
cmHostKey
string
The private key for the Cloudera Manager host in PEM format. Only used if
customCA == true.
caCert
string
The certificate for the user-provided certificate authority in PEM format.
Only used if customCA == true.
trustedCaCerts
string
A list of CA certificates that will be imported into the Auto-TLS
truststore and distributed to all hosts.
When this API returns successfully, you should see the recent command run as
follows.
When this API is executing you can check
/var/log/cloudera-scm-server/cloudera-scm-server.log for API logs.
Restart the Cloudera Manager service. Then restart the Cloudera Manager agents on all
cluster servers.
The Cloudera Manager UI/API is now available on the TLS port. Now restart all the
Cloudera Manager management services.
Restart the Cluster services. Now all the services are configured for wire
encryption.
When adding new hosts to this cluster, the following additional steps need to be
performed to upload the CA signed host certificates to Cloudera Manager.
The add hosts wizard will prompt the following screen with instructions to upload
the certificates.
Upload the certificates to Cloudera Manager using the following
command:
In this example, the CA used to sign all the certificates is “Sec Lab Intermediate
CA” which can be found in the screenshot below:
Cloudera Manager UI:
Knox UI:
Rotate Auto-TLS Certificate Authority and Host Certificates
After the certificate files in the specified paths have been replaced with the new
certificates, run the API calls that were used when enabling Auto-TLS. Refer Step 4 in this
use case to run the Cloudera Manager API. You do not need to run the
addCustomCerts API if you are performing the steps given in this use
case.
