ipa-replica-manage(1) IPA Manual Pages ipa-replica-manage(1)
NAME
ipa-replica-manage - Manage an IPA replica
SYNOPSIS
ipa-replica-manage [OPTION]... [COMMAND]
DESCRIPTION
Manages the replication agreements of an IPA server. The available commands are:
connect [SERVER_A] <SERVER_B>
- Adds a new replication agreement between SERVER_A/localhost and SERVER_B
disconnect [SERVER_A] <SERVER_B>
- Removes a replication agreement between SERVER_A/localhost and SERVER_B
del <SERVER>
- Removes all replication agreements and data about SERVER
list [SERVER]
- Lists all the servers or the list of agreements of SERVER
re-initialize
- Forces a full re-initialization of the IPA server retrieving data from the server specified with the --from option
force-sync
- Immediately flush any data to be replicated from a server specified with the --from option
list-ruv
- List the replication IDs on this server.
clean-ruv [REPLICATION_ID]
- Run the CLEANALLRUV task to remove a replication ID.
abort-clean-ruv [REPLICATION_ID]
- Abort a running CLEANALLRUV task.
list-clean-ruv
- List all running CLEANALLRUV and abort CLEANALLRUV tasks.
dnarange-show [SERVER]
- List the DNA ranges
dnarange-set SERVER START-END
- Set the DNA range on a master
dnanextrange-show [SERVER]
- List the next DNA ranges
dnanextrange-set SERVER START-END
- Set the DNA next range on a master
The connect and disconnect options are used to manage the replication topology. When a replica is created it is only connected with the
master that created it. The connect option may be used to connect it to other existing replicas.
The disconnect option cannot be used to remove the last link of a replica. To remove a replica from the topology use the del option.
If a replica is deleted and then re-added within a short time-frame then the 389-ds instance on the master that created it should be
restarted before re-installing the replica. The master will have the old service principals cached which will cause replication to fail.
Each IPA master server has a unique replication ID. This ID is used by 389-ds-base when storing information about replication status. The
output consists of the masters and their respective replication ID. See clean-ruv
When a master is removed, all other masters need to remove its replication ID from the list of masters. Normally this occurs automatically
when a master is deleted with ipa-replica-manage. If one or more masters was down or unreachable when ipa-replica-manage was executed then
this replica ID may still exist. The clean-ruv command may be used to clean up an unused replication ID.
NOTE: clean-ruv is VERY DANGEROUS. Execution against the wrong replication ID can result in inconsistent data on that master. The master
should be re-initialized from another if this happens.
The replication topology is examined when a master is deleted and will attempt to prevent a master from being orphaned. For example, if
your topology is A <-> B <-> C and you attempt to delete master B it will fail because that would leave masters and A and C orphaned.
The list of masters is stored in cn=masters,cn=ipa,cn=etc,dc=example,dc=com. This should be cleaned up automatically when a master is
deleted. If it occurs that you have deleted the master and all the agreements but these entries still exist then you will not be able to
re-install IPA on it, the installation will fail with:
An IPA master host cannot be deleted or disabled using standard commands (host-del, for example).
An orphaned master may be cleaned up using the del directive with the --cleanup option. This will remove the entries from cn=mas-
ters,cn=ipa,cn=etc that otherwise prevent host-del from working, its dna profile, s4u2proxy configuration, service principals and remove it
from the default DUA profile defaultServerList.
OPTIONS
-H HOST, --host=HOST
The IPA server to manage. The default is the machine on which the command is run Not honoured by the re-initialize command.
-p DM_PASSWORD, --password=DM_PASSWORD
The Directory Manager password to use for authentication
-v, --verbose
Provide additional information
-f, --force
Ignore some types of errors, don't prompt when deleting a master
-c, --no-lookup
Do not perform DNS lookup checks.
-c, --cleanup
When deleting a master with the --force flag, remove leftover references to an already deleted master.
--binddn=ADMIN_DN
Bind DN to use with remote server (default is cn=Directory Manager) - Be careful to quote this value on the command line
--bindpw=ADMIN_PWD
Password for Bind DN to use with remote server (default is the DM_PASSWORD above)
--winsync
Specifies to create/use a Windows Sync Agreement
--cacert=/path/to/cacertfile
Full path and filename of CA certificate to use with TLS/SSL to the remote server - this CA certificate will be installed in the
directory server's certificate database
--win-subtree=cn=Users,dc=example,dc=com
DN of Windows subtree containing the users you want to sync (default cn=Users,<domain suffix> - this is typically what Windows AD
uses as the default value) - Be careful to quote this value on the command line
--passsync=PASSSYNC_PWD
Password for the IPA system user used by the Windows PassSync plugin to synchronize passwords. Required when using --winsync. This
does not mean you have to use the PassSync service.
--from=SERVER
The server to pull the data from, used by the re-initialize and force-sync commands.
RANGES
IPA uses the 389-ds Distributed Numeric Assignment (DNA) Plugin to allocate POSIX ids for users and groups. A range is created when IPA is
installed and half the range is assigned to the first IPA master for the purposes of allocation.
New IPA masters do not automatically get a DNA range assignment. A range assignment is done only when a user or POSIX group is added on
that master.
The DNA plugin also supports an "on-deck" or next range configuration. When the primary range is exhaused, rather than going to another
master to ask for more, it will use its on-deck range if one is defined. Each master can have only one range and one on-deck range defined.
When a master is removed an attempt is made to save its DNA range(s) onto another master in its on-deck range. IPA will not attempt to
extend or merge ranges. If there are no available on-deck range slots then this is reported to the user. The range is effectively lost
unless it is manually merged into the range of another master.
The DNA range and on-deck (next) values can be managed using the dnarange-set and dnanextrange-set commands. The rules for managing these
ranges are:
- The range must be completely contained within a local range as defined by the ipa idrange command.
- The range cannot overlap the DNA range or on-deck range on another IPA master.
- The range cannot overlap the ID range of an AD Trust.
- The primary DNA range cannot be removed.
- An on-deck range range can be removed by setting it to 0-0. The assumption is that the range will be manually moved or merged
elsewhere.
The range and next range of a specific master can be displayed by passing the FQDN of that master to the dnarange-show or dnanextrange-show
command.
Performing range changes as a delegated administrator (e.g. not using the Directory Manager password) requires additional 389-ds ACIs.
These are installed in upgraded masters but not existing ones. The changs are made in cn=config which is not replicated. The result is that
DNA ranges cannot be managed on non-upgraded masters as a delegated administrator.
EXAMPLES
List all masters:
# ipa-replica-manage list
srv1.example.com
srv2.example.com
srv3.example.com
srv4.example.com
List a server's replication agreements.
# ipa-replica-manage list srv1.example.com
srv2.example.com
srv3.example.com
Re-initialize a replica:
# ipa-replica-manage re-initialize --from srv2.example.com
This will re-initialize the data on the server where you execute the command, retrieving the data from the srv2.example.com replica
Add a new replication agreement:
# ipa-replica-manage connect srv2.example.com srv4.example.com
Remove an existing replication agreement:
# ipa-replica-manage disconnect srv1.example.com srv3.example.com
Completely remove a replica:
# ipa-replica-manage del srv4.example.com
Using connect/disconnect you can manage the replication topology.
List the replication IDs in use:
# ipa-replica-manage list-ruv
srv1.example.com:389: 7
srv2.example.com:389: 4
Remove references to an orphaned and deleted master:
# ipa-replica-manage del --force --cleanup master.example.com
WINSYNC
Creating a Windows AD Synchronization agreement is similar to creating an IPA replication agreement, there are just a couple of extra
steps.
A special user entry is created for the PassSync service. The DN of this entry is uid=passsync,cn=sysaccounts,cn=etc,<basedn>. You are not
required to use PassSync to use a Windows synchronization agreement but setting a password for the user is required.
The following examples use the AD administrator account as the synchronization user. This is not mandatory but the user must have
read-access to the subtree.
1. Transfer the base64-encoded Windows AD CA Certificate to your IPA Server
2. Remove any existing kerberos credentials
# kdestroy
3. Add the winsync replication agreement
# ipa-replica-manage connect --winsync --passsync=<bindpwd_for_syncuser_that will_be_used_for_agreement> --cacert=/path/to/adscac-
ert/WIN-CA.cer --binddn "cn=administrator,cn=users,dc=ad,dc=example,dc=com" --bindpw <ads_administrator_password> -v <adserver.fqdn>
You will be prompted to supply the Directory Manager's password.
Create a winsync replication agreement:
# ipa-replica-manage connect --winsync --passsync=MySecret --cacert=/root/WIN-CA.cer --binddn "cn=administra-
tor,cn=users,dc=ad,dc=example,dc=com" --bindpw MySecret -v windows.ad.example.com
Remove a winsync replication agreement:
# ipa-replica-manage disconnect windows.ad.example.com
PASSSYNC
PassSync is a Windows service that runs on AD Domain Controllers to intercept password changes. It sends these password changes to the IPA
LDAP server over TLS. These password changes bypass normal IPA password policy settings and the password is not set to immediately expire.
This is because by the time IPA receives the password change it has already been accepted by AD so it is too late to reject it.
IPA maintains a list of DNs that are excempt from password policy. A special user is added automatically when a winsync replication agree-
ment is created. The DN of this user is added to the excemption list stored in passSyncManagersDNs in the entry cn=ipa_pwd_extop,cn=plug-
ins,cn=config.
EXIT STATUS
0 if the command was successful
1 if an error occurred
IPA
Mar 1 2013 ipa-replica-manage(1)