[role="xpack"] [[tls-http]] ==== Encrypting HTTP Client Communications When {security} is enabled, you can optionally use TLS to ensure that communication between HTTP clients and the cluster is encrypted. NOTE: Enabling TLS on the HTTP layer is strongly recommended but is not required. If you enable TLS on the HTTP layer in {es}, then you might need to make configuration changes in other parts of the Elastic Stack and in any {es} clients that you use. . If you have not done so already, <<node-certificates,generate node certificates>>. . Enable TLS and specify the information required to access the node’s certificate. ** If the certificate is in PKCS#12 format, add the following information to the `elasticsearch.yml` file on each node: + -- [source, yaml] -------------------------------------------------- xpack.security.http.ssl.enabled: true xpack.security.http.ssl.keystore.path: certs/elastic-certificates.p12 <1> xpack.security.http.ssl.truststore.path: certs/elastic-certificates.p12 <2> -------------------------------------------------- <1> If you created a separate certificate for each node, then you might need to customize this path on each node. If the filename matches the node name, you can use the `certs/${node.name}.p12` format, for example. <2> The `elasticsearch-certutil` output includes the CA certificate inside the PKCS#12 keystore, therefore the keystore can also be used as the truststore. This name should match the `keystore.path` value. -- ** If the certificate is in PEM format, add the following information to the `elasticsearch.yml` file on each node: + -- [source, yaml] -------------------------------------------------- xpack.security.http.ssl.enabled: true xpack.security.http.ssl.key: /home/es/config/x-pack/node01.key <1> xpack.security.http.ssl.certificate: /home/es/config/x-pack/node01.crt <2> xpack.security.http.ssl.certificate_authorities: [ "/home/es/config/x-pack/ca.crt" ] <3> -------------------------------------------------- <1> The full path to the node key file. This must be a location within the {es} configuration directory. <2> The full path to the node certificate. This must be a location within the {es} configuration directory. <3> An array of paths to the CA certificates that should be trusted. These paths must be a location within the {es} configuration directory. -- . If you secured the node's certificate with a password, add the password to your {es} keystore: ** If the signed certificate is in PKCS#12 format, use the following commands: + -- [source,shell] ----------------------------------------------------------- bin/elasticsearch-keystore add xpack.security.http.ssl.keystore.secure_password bin/elasticsearch-keystore add xpack.security.http.ssl.truststore.secure_password ----------------------------------------------------------- -- ** If the certificate is in PEM format, use the following commands: + -- [source,shell] ----------------------------------------------------------- bin/elasticsearch-keystore add xpack.security.http.ssl.secure_key_passphrase ----------------------------------------------------------- -- . Restart {es}. NOTE: All TLS-related node settings are considered to be highly sensitive and therefore are not exposed via the {ref}/cluster-nodes-info.html#cluster-nodes-info[nodes info API] For more information about any of these settings, see <<security-settings>>.