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ipa-replica-manage: adjust del to work with managed topology
Introduces new method for deletion of replica. This method is used if managed topology is enabled. part of https://fedorahosted.org/freeipa/ticket/4302 Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>
This commit is contained in:
Petr Vobornik
parent
d58bdf29a5
commit
e9e4509b10
@ -25,6 +25,7 @@ import traceback
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from urllib2 import urlparse
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import ldap
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import socket
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import time
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from ipapython import ipautil
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from ipaserver.install import replication, dsinstance, installutils
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@ -564,6 +565,13 @@ def check_last_link(delrepl, realm, dirman_passwd, force):
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else:
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return None
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def check_last_link_managed(api, masters, hostname, force):
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# segments = api.Command.topologysegment_find(u'realm', sizelimit=0).get('result')
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# replica_names = [m.single_value('cn') for m in masters]
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# orphaned = []
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# TODO add proper graph traversing algorithm here
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return None
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def enforce_host_existence(host, message=None):
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if host is not None and not ipautil.host_exists(host):
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if message is None:
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@ -571,8 +579,161 @@ def enforce_host_existence(host, message=None):
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sys.exit(message)
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def ensure_last_services(conn, hostname, masters, options):
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"""
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1. When deleting master, check if there will be at least one remaining
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DNS and CA server.
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2. Pick CA renewal master
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Return this_services, other_services, ca_hostname
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"""
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this_services = []
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other_services = []
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ca_hostname = None
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for master in masters:
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master_cn = master['cn'][0]
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try:
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services = conn.get_entries(master['dn'], conn.SCOPE_ONELEVEL)
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except errors.NotFound:
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continue
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services_cns = [s.single_value['cn'] for s in services]
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if master_cn == hostname:
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this_services = services_cns
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else:
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other_services.append(services_cns)
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if ca_hostname is None and 'CA' in services_cns:
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ca_hostname = master_cn
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if 'CA' in this_services and not any(['CA' in o for o in other_services]):
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print "Deleting this server is not allowed as it would leave your installation without a CA."
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sys.exit(1)
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other_dns = True
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if 'DNS' in this_services and not any(['DNS' in o for o in other_services]):
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other_dns = False
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print "Deleting this server will leave your installation without a DNS."
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if not options.force and not ipautil.user_input("Continue to delete?", False):
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sys.exit("Deletion aborted")
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# test if replica is not DNSSEC master
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# allow to delete it if is last DNS server
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if 'DNS' in this_services and other_dns and not options.force:
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dnssec_masters = opendnssecinstance.get_dnssec_key_masters(conn)
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if hostname in dnssec_masters:
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print "Replica is active DNSSEC key master. Uninstall could break your DNS system."
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sys.exit("Deletion aborted")
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ca = cainstance.CAInstance(api.env.realm, certs.NSS_DIR)
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if ca.is_renewal_master(hostname):
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try:
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ca.set_renewal_master(options.host)
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except errors.NotFound:
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ca.set_renewal_master(ca_hostname)
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return this_services, other_services, ca_hostname
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def cleanup_server_dns_entries(realm, hostname, suffix, options):
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try:
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if bindinstance.dns_container_exists(options.host, suffix,
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dm_password=options.dirman_passwd):
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bind = bindinstance.BindInstance()
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bind.remove_master_dns_records(hostname, realm, realm.lower())
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bind.remove_ipa_ca_dns_records(hostname, realm.lower())
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bind.remove_server_ns_records(hostname)
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keysyncd = dnskeysyncinstance.DNSKeySyncInstance()
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keysyncd.remove_replica_public_keys(hostname)
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except Exception, e:
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print "Failed to cleanup %s DNS entries: %s" % (hostname, e)
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print "You may need to manually remove them from the tree"
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def del_master(realm, hostname, options):
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if has_managed_topology():
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del_master_managed(realm, hostname, options)
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else:
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del_master_direct(realm, hostname, options)
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def del_master_managed(realm, hostname, options):
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"""
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Removing of master in managed_topology
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"""
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hostname_u = unicode(hostname)
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if hostname == options.host:
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print "Can't remove itself: %s" % (options.host)
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sys.exit(1)
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# 1. Connect to the local server
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try:
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thisrepl = replication.ReplicationManager(realm, options.host,
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options.dirman_passwd)
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except Exception as e:
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print "Failed to connect to server %s: %s" % (options.host, e)
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sys.exit(1)
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# 2. Get all masters
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masters = api.Command.server_find('', sizelimit=0)['result']
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# 3. Check topology
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orphans = check_last_link_managed(api, masters, hostname, options.force)
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# 4. Check that we are not leaving the installation without CA and/or DNS
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# And pick new CA master.
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ensure_last_services(api.Backend.ldap2, hostname, masters, options)
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# Save the RID value before we start deleting
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rid = get_rid_by_host(realm, options.host, hostname,
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options.dirman_passwd, options.nolookup)
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# 5. Remove master entry. Topology plugin will remove replication agreements.
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try:
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api.Command.server_del(hostname_u)
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except errors.NotFound:
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print "Server entry already deleted: %s" % (hostname)
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# 6. Cleanup
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try:
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thisrepl.replica_cleanup(hostname, realm, force=True)
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except Exception, e:
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print "Failed to cleanup %s entries: %s" % (hostname, e)
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print "You may need to manually remove them from the tree"
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# 7. Clean RUV for the deleted master
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# Wait for topology plugin to delete segments
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i = 0
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while True:
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left = api.Command.topologysegment_find(
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u'realm', iparepltoposegmentleftnode=hostname_u, sizelimit=0)['result']
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right = api.Command.topologysegment_find(
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u'realm', iparepltoposegmentrightnode=hostname_u, sizelimit=0)['result']
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if not left and not right:
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print "Agreements deleted"
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break
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time.sleep(1)
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if i == 5: # taking too long, something is wrong, report
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print "Waiting for removal of replication agreements"
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i += 1
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# Clean RUV
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if rid is not None:
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try:
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thisrepl.cleanallruv(rid)
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except KeyboardInterrupt:
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print "Wait for task interrupted. It will continue to run in the background"
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# 8. And clean up the removed replica DNS entries if any.
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cleanup_server_dns_entries(realm, hostname, thisrepl.suffix, options)
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def del_master_direct(realm, hostname, options):
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"""
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Removing of master for realm without managed topology (domain level < 1)
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"""
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force_del = False
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delrepl = None
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@ -651,10 +812,8 @@ def del_master(realm, hostname, options):
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# Check for orphans if the remote server is up.
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if delrepl and not winsync:
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masters_dn = DN(('cn', 'masters'), ('cn', 'ipa'), ('cn', 'etc'), ipautil.realm_to_suffix(realm))
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try:
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masters = delrepl.conn.get_entries(
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masters_dn, delrepl.conn.SCOPE_ONELEVEL)
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masters = api.Command.server_find('', sizelimit=0)['result']
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except Exception, e:
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masters = []
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print "Failed to read masters data from '%s': %s" % (
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@ -672,53 +831,9 @@ def del_master(realm, hostname, options):
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print "You will need to reconfigure your replication topology to delete this server."
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sys.exit(1)
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# Check that we are not leaving the installation without CA and/or DNS
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this_services = []
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other_services = []
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ca_hostname = None
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for master_cn in [m.single_value['cn'] for m in masters]:
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master_dn = DN(('cn', master_cn), ('cn', 'masters'), ('cn', 'ipa'), ('cn', 'etc'), ipautil.realm_to_suffix(realm))
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try:
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services = delrepl.conn.get_entries(master_dn,
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delrepl.conn.SCOPE_ONELEVEL)
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except errors.NotFound:
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continue
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services_cns = [s.single_value['cn'] for s in services]
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if master_cn == hostname:
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this_services = services_cns
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else:
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other_services.append(services_cns)
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if ca_hostname is None and 'CA' in services_cns:
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ca_hostname = master_cn
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if 'CA' in this_services and not any(['CA' in o for o in other_services]):
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print "Deleting this server is not allowed as it would leave your installation without a CA."
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sys.exit(1)
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other_dns = True
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if 'DNS' in this_services and not any(['DNS' in o for o in other_services]):
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other_dns = False
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print "Deleting this server will leave your installation without a DNS."
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if not options.force and not ipautil.user_input("Continue to delete?", False):
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sys.exit("Deletion aborted")
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# test if replica is not DNSSEC master
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# allow to delete it if is last DNS server
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if 'DNS' in this_services and other_dns and not options.force:
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dnssec_masters = opendnssecinstance.get_dnssec_key_masters(delrepl.conn)
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if hostname in dnssec_masters:
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print "Replica is active DNSSEC key master. Uninstall could break your DNS system."
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sys.exit("Deletion aborted")
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# Pick CA renewal master
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ca = cainstance.CAInstance(api.env.realm, certs.NSS_DIR)
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if ca.is_renewal_master(hostname):
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try:
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ca.set_renewal_master(options.host)
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except errors.NotFound:
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ca.set_renewal_master(ca_hostname)
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# 4. Check that we are not leaving the installation without CA and/or DNS
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# And pick new CA master.
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ensure_last_services(thisrepl.conn, hostname, masters, options)
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else:
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print "Skipping calculation to determine if one or more masters would be orphaned."
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@ -753,19 +868,7 @@ def del_master(realm, hostname, options):
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print "You may need to manually remove them from the tree"
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# 7. And clean up the removed replica DNS entries if any.
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try:
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if bindinstance.dns_container_exists(options.host, thisrepl.suffix,
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dm_password=options.dirman_passwd):
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bind = bindinstance.BindInstance()
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bind.remove_master_dns_records(hostname, realm, realm.lower())
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bind.remove_ipa_ca_dns_records(hostname, realm.lower())
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bind.remove_server_ns_records(hostname)
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keysyncd = dnskeysyncinstance.DNSKeySyncInstance()
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keysyncd.remove_replica_public_keys(hostname)
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except Exception, e:
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print "Failed to cleanup %s DNS entries: %s" % (hostname, e)
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print "You may need to manually remove them from the tree"
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cleanup_server_dns_entries(realm, hostname, thisrepl.suffix, options)
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def add_link(realm, replica1, replica2, dirman_passwd, options):
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