Upload aliases.json to the upgraded cluster

You can upload the existing aliases.json file to the upgraded cluster to recreate aliases.

Create a jaas.conf file:
- If you have a keytab for the solr user (for example from the latest Solr process directory under /var/run/cloudera-scm-agent/process), create the file with the following contents:
```
Client {
           com.sun.security.auth.module.Krb5LoginModule required
           useKeyTab=true
           useTicketCache=false
           principal="solr@[***EXAMPLE.COM***]";
           };
```
  - Replace [***EXAMPLE.COM***] with your Kerberos realm name.
  - Make sure that the principal specified in the jaas.conf matches that in the keytab file. When pointing the keytab parameter directly to the solr.keytab in the process directories, be aware that those are only readable by the root user.
- If you have a password for the solr user and you want to use the Kerberos ticket cache:
```
Client {
           com.sun.security.auth.module.Krb5LoginModule required
           useKeyTab=false
           useTicketCache=true
           principal="solr@[***EXAMPLE.COM***]";
           };
```
  Replace [***EXAMPLE.COM***] with your Kerberos realm name.
Set the LOG4J_PROPS environment variable to a log4j.properties file:
```
export LOG4J_PROPS=/etc/zookeeper/conf/log4j.properties
```
If you use a password, you need to authenticate as the solr user. If you authenticate with a keytab, skip this step.
```
kinit solr@[***EXAMPLE.COM***]
```
Replace [***EXAMPLE.COM***] with your Kerberos realm name.
Run the zkcli.sh script as follows:
```
/opt/cloudera/parcels/CDH/lib/solr/bin/zkcli.sh -zkhost [***zk01.example.com***]:2181/solr -cmd putfile /aliases.json [***/PATH/TO/aliases.json***]
```
- Replace [***zk01.example.com***] with the hostname of a ZooKeeper server.
- Replace [***/PATH/TO/aliases.json***] with the target location where you want to copy aliases.json