Hostname used by IPA must be a system hostname

Make sure that the hostname IPA uses is a system hostname. If user
passes a non-system hostname, update the network settings and
system hostname in the same way that ipa-client-install does.

This step should prevent various services failures which may not
be ready to talk to IPA with non-system hostname.

https://fedorahosted.org/freeipa/ticket/1931

install/tools/ipa-server-install

@@ -524,6 +524,14 @@ def uninstall():
 
     ipaservices.knownservices.ipa.disable()
 
+    old_hostname = sstore.restore_state('network','hostname')
+    system_hostname = get_fqdn()
+    if old_hostname is not None and old_hostname != system_hostname:
+        try:
+            ipautil.run(['/bin/hostname', old_hostname])
+        except CalledProcessError, e:
+            print >>sys.stderr, "Failed to set this machine hostname back to %s (%s)." % (old_hostname, str(e))
+
     # Now for some sanity checking. Make sure everything was really
     # uninstalled.
     serverids = dsinstance.check_existing_installation()
@@ -751,6 +759,15 @@ def main():
     host_name = host_name.lower()
     logging.debug("will use host_name: %s\n" % host_name)
 
+    system_hostname = get_fqdn()
+    if host_name != system_hostname:
+        print >>sys.stderr
+        print >>sys.stderr, "Warning: hostname %s does not match system hostname %s." \
+                            % (host_name, system_hostname)
+        print >>sys.stderr, "System hostname will be updated during the installation process"
+        print >>sys.stderr, "to prevent service failures."
+        print >>sys.stderr
+
     if not options.domain_name:
         domain_name = read_domain_name(host_name[host_name.find(".")+1:], options.unattended)
         logging.debug("read domain_name: %s\n" % domain_name)
@@ -871,6 +888,12 @@ def main():
         print "Please wait until the prompt is returned."
         print ""
 
+    if host_name != system_hostname:
+        logging.debug("Chosen hostname (%s) differs from system hostname (%s) - change it" \
+                      % (host_name, system_hostname))
+        # configure /etc/sysconfig/network to contain the custom hostname
+        ipaservices.backup_and_replace_hostname(fstore, sstore, host_name)
+
     # Create DS group if it doesn't exist yet
     try:
         grp.getgrnam(dsinstance.DS_GROUP)

install/tools/man/ipa-server-install.1

@@ -43,7 +43,7 @@ The kerberos master password (normally autogenerated)
 The password for the IPA admin user
 .TP
 \fB\-\-hostname\fR=\fIHOST_NAME\fR
-The fully\-qualified DNS name of this server
+The fully\-qualified DNS name of this server. If the hostname does not match system hostname, the system hostname will be updated accordingly to prevent service failures.
 .TP
 \fB\-\-ip\-address\fR=\fIIP_ADDRESS\fR
 The IP address of this server. If this address does not match the address the host resolves to and --setup-dns is not selected the installation will fail.

ipa-client/ipa-install/ipa-client-install

@@ -955,8 +955,10 @@ def install(options, env, fstore, statestore):
     if not options.unattended and not user_input("Continue to configure the system with these values?", False):
         return CLIENT_INSTALL_ERROR
 
-    if options.hostname:
+    if options.hostname and not options.on_master:
         # configure /etc/sysconfig/network to contain the hostname we set.
+        # skip this step when run by ipa-server-install as it always configures
+        # hostname if different from system hostname
         ipaservices.backup_and_replace_hostname(fstore, statestore, options.hostname)
 
     if not options.unattended:

ipaserver/install/installutils.py

@@ -160,11 +160,6 @@ def verify_fqdn(host_name, no_host_dns=False, local_hostname=True):
         except socket.gaierror:
             pass
 
-        system_host_name = socket.gethostname()
-        if not (host_name + '.').startswith(system_host_name + '.'):
-            print "Warning: The host name '%s' does not match the system host name '%s'." % (host_name, system_host_name)
-            print "         Some services may not work properly."
-
     if no_host_dns:
         print "Warning: skipping DNS resolution of host", host_name
         return