Configuring SSL/TLS certificate exchange between two Cloudera Manager instances

You must manually set up an SSL/TLS certificate exchange between two Cloudera Manager instances that manage source and target cluster respectively. Replication Manager uses this information to set up the peers for secure data replication.

Replication Manager supports Cloudera Manager high availability functionality only after you manually configure the SSL/TLS certificate exchange.

When the source Cloudera Manager is configured for high availability and is Auto-TLS enabled, the certificate exchange is initiated from the source cluster to the target cluster where the certificate is exported from the load balancer node of the source cluster.

Go to the truststore location in source Cloudera Manager, and perform the following steps:
1. List the contents of the keystore file and password using the [***KEYTOOL PATH***] -list -keystore [***TRUSTSTORE JKS FILE LOCATION ***] -storepass [***TRUSTSTORE PASSWORD***] command.
  For example, /usr/lib/jvm/java-openjdk-11/bin/keytool - list -keystore /var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks -storepass [***TRUSTSTORE PASSWORD***]
  tip
  The keytool path can be located in various locations including the keytool itself. For example, it can be located in /usr/lib/jvm/java-openjdk-11/bin/keytool or /usr/java/default/bin/keytool.
  
  You can locate the truststore password using the cat /etc/hadoop/conf/ssl-client.xml command. You can enter the SSL password for the /etc/hadoop/conf/ssl-client.xml file when prompted.
  
  Alternatively, you can also run the following commands instead of the command in Step a:
  export JAVA_HOME=[***KEYTOOL LOCATION***] export TRUSTSTORE_JKS=[***TRUSTSTORE JKS FILE LOCATION***] export TRUSTSTORE_PASSWORD=[***PASSWORD IN THE SSL-CLIENT.XML FILE***] $JAVA_HOME/keytool -list -keystore $TRUSTSTORE_JKS -storepass $TRUSTSTORE_PASSWORD
2. Export the certificate contents in the host to a file using the [***KEYTOOL***] -exportcert -keystore[***TRUSTSTORE JKS FILE LOCATION ***] -alias [***CM ALIAS ON SRC CM***] -file ./[***TXT file, for example: source-cert.txt***] -storepass [***TRUSTSTORE_PASSWORD***] command.
  For example,
```
/usr/java/default/bin/keytool -exportcert -keystore /var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks -alias cmrootca-0 -file ./source-cert.txt -storepass [***TRUSTSTORE PASSWORD***]
```
3. Copy the text file to all the hosts of the target cluster Cloudera Manager securely using the scp -i [***PEM FILE***] [***TXT file - source-cert.txt***] root@[***HOST IP***]:/home/ command.
4. Import the certificate into the keystore file on all the hosts of the target cluster Cloudera Manager using the [***KEYTOOL***] -importcert -noprompt -v -trustcacerts -keystore [***TRUSTSTORE JKS FILE LOCATION ***] -alias [***CM ALIAS ON DEST CM***] -file ./[***TXT file - source-cert.txt***] --storepass [***TRUSTSTORE_PASSWORD***] command.
  For example,
```
/usr/java/default/bin/keytool -importcert -noprompt -v -trustcacerts -keystore /var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks -alias cmrootca-1 -file ./source-cert.txt --storepass [***TRUSTSTORE PASSWORD***]
```
Go to the truststore location in target Cloudera Manager, and perform the following steps:
1. List the contents of the keystore file and password using the [***KEYTOOL PATH***] -list -keystore [***TRUSTSTORE JKS FILE LOCATION ***] -storepass [***TRUSTSTORE PASSWORD***] command.
2. Export the certificate contents in the host to a file using the [***KEYTOOL***] -exportcert -keystore [***TRUSTSTORE JKS FILE LOCATION ***] -alias [***CM ALIAS ON DEST CM***] -file ./[***TXT file, for example: dest-cert.txt***] -storepass [***TRUSTSTORE_PASSWORD***] command.
3. Copy the text file to all the hosts of the source cluster Cloudera Manager securely using the scp -i [***PEM FILE***] [***TXT file - dest-cert.txt***] root@[***HOST IP***]:/home/ command.
4. Import the certificate into the keystore file on all the hosts of the source Cloudera Manager using the [***KEYTOOL***] -importcert -noprompt -v -trustcacerts -keystore [***TRUSTSTORE JKS FILE LOCATION ***] -alias [***CM ALIAS ON SRC CM***] -file ./[***TXT file - dest-cert.txt***] --storepass [***TRUSTSTORE PASSWORD***] command.
note
Perform this step only for Ozone replication policies.
Import the S3G CA certificate from the cluster to the local JDK path using the following commands:
1. Run the keytool -importkeystore -destkeystore [***JDK CACERTS LOCATION***] -srckeystore [***CM-AUTO-GLOBAL_TRUSTSTORE.JKS LOCATION***] -srcalias [***CM ALIAS ON SRC CM***] command on all the hosts of the source Cloudera Manager.
  For example, keytool -importkeystore -destkeystore /usr/java/default/lib/security/cacerts -srckeystore /var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks -srcalias cmrootca-0
2. Run the following commands on all the hosts of the target Cloudera Manager:
  1. keytool -importkeystore -destkeystore [***JDK CACERTS LOCATION***] -srckeystore [***CM-AUTO-GLOBAL_TRUSTSTORE.JKS LOCATION***] -srcalias [***CM ALIAS ON SRC CM***]
  2. keytool -importkeystore -destkeystore [***JDK CACERTS LOCATION***] -srckeystore [***CM-AUTO-GLOBAL_TRUSTSTORE.JKS LOCATION***] -srcalias [***CM ALIAS ON DEST CM***]
  tip
  Enter the security/jssecacerts path for the -destkeystore attribute if the file exists. Otherwise, enter the security/cacerts path.
  For example,
```
keytool -importkeystore -destkeystore /usr/java/default/lib/security/cacerts 
-srckeystore /var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks -srcalias cmrootca-0
keytool -importkeystore -destkeystore /usr/java/default/lib/security/cacerts 
-srckeystore /var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks -srcalias cmrootca-1
```
  note
  If you do not complete Step 3 before you create and run an Ozone replication policy, an SSL certificate exception might appear during the file listing phase of the ozone replication policy job run.