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/var/www/html/sp-metadata.xml 

– as long as your Apache configuration sets DocumentRoot to /var/www/html (for instance in /etc/httpd/conf/httpd.conf) 

To be shared dynamically with your site's IdP (i.e. make it available as a document at the document root and share that URL with your IdP's maintainers/admins); or omit from the SP's (i.e. your) web server, and instead share it securely with the IdP admins whenever it changes (if it does)

In either case, populate the entityID, public key certificate, and consumer service location with yours.

Populate the entityID attribute in<ApplicationDefaults> to match your entityID in sp-metadata.xml.

Populate the entityID attribute in <SSO> to match the idP's entityID in idp-metadata.xml. 

The <CredentialResolver> element specifies the private+public key to use for encryption and signing while communicating with the idP. If you put the keys in the location specified above, there is no need to modify this element. Otherwise edit this file to reflect the location of the keys.Private

The private key should be stored in a "safe" location. what if If it is password-protected?, that should be reflected in the <CredentialResolver>'s "password" attribute.

Populate the ServerName and ProxyPass , ProxyPass and Header set Access-Control-Allow-Origin directives with your hostname.

Most likely the following 3 attributes of <Connector port="6443"... /> are already populated, but if not then populate certificateKeystoreFile, certificateKeystorePassword, certificateKeyAlias.

You will need to populate proxyName in the AjpNio2Protocol connector.

Once done, Merge the contents  of server.xml-sample into the existing /opt/shrine/tomcat/conf/server.xml.

sso/shrine/shrine.conf-sample

or

sso/shrine/override.conf-sample

/opt/shrine/tomcat/lib/shrine.conf

or

/opt/shrine/tomcat/lib/override.conf

Set Shrine configuration options for using SSO for login/logout.

Specify that we are using SSO: shrine.queryEntryPoint.authenticationType = "sso"

Specify the logout URL (shrine.webclient.ssoLogoutUrl).

Specify Shrine's session timeout in ms (shrine.webclient.sessionTimeoutMs).

You should use either file and merge it into the existing shrine.conf or override.conf in /opt/shrine/tomcat/lib