Move SSL/TLS setup to it's own document

docs/ssl-tls-setup.md

@@ -0,0 +1,75 @@
+# X-Pack Security SSL/TLS
+
+The role allows configuring HTTP and transport layer SSL/TLS for the cluster. You will need to generate and provide your own PKCS12 or PEM encoded certificates as described in [Encrypting communications in Elasticsearch](https://www.elastic.co/guide/en/elasticsearch/reference/7.4/configuring-tls.html#configuring-tls).
+
+The following should be configured to ensure a security-enabled cluster successfully forms:
+
+* `es_enable_http_ssl`  Default `false`. Setting this to `true` will enable HTTP client SSL/TLS
+* `es_enable_transport_ssl` - Default `false`. Setting this to `true` will enable transport layer SSL/TLS
+
+When using a [PKCS12](https://www.elastic.co/guide/en/elasticsearch/reference/current/security-settings.html#security-http-pkcs12-files) keystore and truststore:
+
+* `es_ssl_keystore`  path to your PKCS12 keystore (can be the same as `es_ssl_truststore`)
+* `es_ssl_keystore_password`  set this if your keystore is protected with a password
+* `es_ssl_truststore`  path to your PKCS12 keystore (can be the same as `es_ssl_keystore`)
+* `es_ssl_truststore_password`  set this if your truststore is protected with a password
+
+When using [PEM encoded](https://www.elastic.co/guide/en/elasticsearch/reference/current/security-settings.html#_pem_encoded_files_3) certificates:
+
+* `es_ssl_key`  path to your SSL key
+* `es_ssl_key_password`  set this if your SSL key is protected with a password
+* `es_ssl_certificate`  the path to your SSL certificate
+
+## Generating an SSL keystore
+
+With a password:
+
+```shell
+$ bin/elasticsearch-certutil ca --out ./my-ca.p12 --pass "ca_password"
+$ bin/elasticsearch-certutil cert --ca ./my-ca.p12 --ca-pass "ca_password" --out ./my-keystore.p12 --pass "keystore_password"
+```
+
+Without a password:
+
+```shell
+$ bin/elasticsearch-certutil ca --out ./my-ca.p12 --pass ""
+$ bin/elasticsearch-certutil cert --ca ./my-ca.p12 --out ./my-keystore.p12 --pass ""
+```
+
+## Additional optional SSL/TLS configuration
+
+* `es_ssl_certificate_path`  Default `{{ es_conf_dir }}/certs`. The location where certificates should be stored on the ES node.
+* `es_ssl_verification_mode` Default `certificate`. See [SSL verification_mode](https://www.elastic.co/guide/en/elasticsearch/reference/current/security-settings.html#ssl-tls-settings) for options.
+* `es_ssl_certificate_authority`  PEM encoded certificate file that should be trusted.
+* `es_validate_certs`  Default `yes`. Determines if ansible should validate SSL certificates when performing actions over HTTPS. e.g. installing templates and managing native users.
+
+## Example SSL/TLS configuration
+
+```yaml
+- name: Elasticsearch with SSL/TLS enabled
+  hosts: localhost
+  roles:
+    - role: elastic.elasticsearch
+  vars:
+    es_config:
+      node.name: "node1"
+      cluster.name: "custom-cluster"
+      discovery.seed_hosts: "localhost:9301"
+      http.port: 9201
+      transport.port: 9301
+      node.data: false
+      node.master: true
+      bootstrap.memory_lock: true
+      xpack.security.authc.realms.file.file1.order: 0
+      xpack.security.authc.realms.native.native1.order: 1
+    es_heap_size: 1g
+    es_api_basic_auth_username: elastic
+    es_api_basic_auth_password: changeme
+    es_enable_http_ssl: true
+    es_enable_transport_ssl: true
+    es_ssl_keystore: "files/certs/my-keystore.p12"
+    es_ssl_truststore: "files/certs/my-truststore.p12"
+    es_ssl_keystore_password: "keystore_password"
+    es_ssl_truststore_password: "truststore_password"
+    es_validate_certs: no
+```