You can easily change the MCF password by the Datafari admin UI.
Click Connectors → Change MCF Password.
Enter the new password and confirm it. The new password will be active just few seconds after you changed it.
You also need to modify these files :
/opt/datafari/bin/monitorUtils/check_jobs_mcf.sh :
Update the line :PASSWORD_MCF=password
EE edition only : /opt/datafari/bin/monitorUtils/monitor_job_mcf.sh
Update the line :PASSWORD_MCF=password
EE edition only : /opt/datafari/bin/purgeUtils/vacuum-mcf.sh
Update the line :PASSWORD_MCF=password
EE edition only : /root/.pgpass
Change the line :localhost:5432:*:postgres:password