You then need to trust the certificate on all the linux hosts
From the IBM article:
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Create ‘/etc/pki/ca-trust/source/anchors/activedirectory.pem’ and paste the certificate contents
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Trust CA cert: sudo update-ca-trust enable; sudo update-ca-trust extract; sudo update-ca-trust check
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Trust CA cert in Java:
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mycert=/etc/pki/ca-trust/source/anchors/activedirectory.pem sudo keytool -importcert -noprompt -storepass changeit -file ${mycert} -alias ad -keystore /etc/pki/java/cacerts
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And at last, please make sure every node on your cluster has access to the ad host.
LDAP support is a key part of setting up a production Hadoop cluster.