Create Installing_OCSP.adoc

copied/converted from  Installing_OCSP.md

docs/installation/ocsp/Installing_OCSP.adoc

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+// This page was initially copied/converted from Installing_OCSP.md
+
+= Installing OCSP =
+
+== Overview ==
+
+This page describes the process to install an OCSP subsystem.
+
+== OCSP Subsystem Installation ==
+
+Prepare a file (e.g. ocsp.cfg) that contains the deployment configuration.
+A sample deployment configuration is available at link:../../../base/server/examples/installation/ocsp.cfg[/usr/share/pki/server/examples/installation/ocsp.cfg].
+
+Then execute the following command:
+
+```
+$ pkispawn -f ocsp.cfg -s OCSP
+```
+
+It will install OCSP subsystem in a Tomcat instance (default is pki-tomcat) and create the following NSS databases:
+
+* server NSS database: /var/lib/pki/pki-tomcat/conf/alias
+* admin NSS database: ~/.dogtag/pki-tomcat/ocsp/alias
+
+**Note**: When OCSP is installed on a new system without any other subsystems,
+it is necessary to provide the CA's root certificate. Specify the path to
+the CA PKCS#7 PEM file in the `pki_cert_chain_path`. This will allow the server
+to verify the CA's SSL server certificate when contacting the security domain.
+It is up to the administrator to securely transport the CA root certificate
+(public key only!) to the system prior to OCSP installation.
+
+== Verifying System Certificates ==
+
+Verify that the server NSS database contains the following certificates:
+
+```
+$ certutil -L -d /var/lib/pki/pki-tomcat/conf/alias
+
+Certificate Nickname                                         Trust Attributes
+                                                             SSL,S/MIME,JAR/XPI
+
+ca_signing                                                   CT,C,C
+ocsp_signing                                                 u,u,u
+subsystem                                                    u,u,u
+ocsp_audit_signing                                           u,u,Pu
+sslserver                                                    u,u,u
+```
+
+== Verifying Admin Certificate ==
+
+Prepare a client NSS database (e.g. ~/.dogtag/nssdb):
+
+```
+$ pki -c Secret.123 client-init
+```
+
+Import the CA signing certificate:
+
+```
+$ pki -c Secret.123 client-cert-import ca_signing --ca-cert ca_signing.crt
+```
+
+Import admin key and certificate:
+
+```
+$ pki -c Secret.123 pkcs12-import \
+    --pkcs12 ca_admin_cert.p12 \
+    --pkcs12-password Secret.123
+```
+
+Verify that the admin certificate can be used to access the OCSP subsystem by executing the following command:
+
+```
+$ pki -c Secret.123 -n caadmin ocsp-user-show ocspadmin
+----------------
+User "ocspadmin"
+----------------
+  User ID: ocspadmin
+  Full name: ocspadmin
+  Email: [email protected]
+  Type: adminType
+  State: 1
+```
+
+== Verifying OCSP Client ==
+
+Publish the CRL in CA to the directory server as follows:
+
+* Go to CA Agent UI (https://pki.example.com:8443/ca/agent/ca/).
+* Click **Update Directory Server**.
+* Select **Update the certificate revocation list to the directory**.
+* Click **Update Directory**.
+
+Verify that the OCSPClient can be used to validate a certificate:
+
+```
+$ OCSPClient \
+ -d /var/lib/pki/pki-tomcat/conf/alias \
+ -h pki.example.com \
+ -p 8080 \
+ -t /ocsp/ee/ocsp \
+ -c ca_signing \
+ --serial 1
+CertID.serialNumber=1
+CertStatus=Good
+```