* The root password of a cluster node is required for adding nodes.
+* Online migration of virtual machines is only supported when nodes have CPUs
+ from the same vendor. It might work otherwise, but this is never guaranteed.
+
NOTE: It is not possible to mix {pve} 3.x and earlier with {pve} 4.X cluster
nodes.
main cluster network (Link 0). It defaults to the IP resolved via the node's
hostname.
-To add a second link as fallback, you can select the 'Advanced' checkbox and
-choose an additional network interface (Link 1, see also
-xref:pvecm_redundancy[Corosync Redundancy]).
+As of {pve} 6.2, up to 8 fallback links can be added to a cluster. To add a
+redundant link, click the 'Add' button and select a link number and IP address
+from the respective fields. Prior to {pve} 6.2, to add a second link as
+fallback, you can select the 'Advanced' checkbox and choose an additional
+network interface (Link 1, see also xref:pvecm_redundancy[Corosync Redundancy]).
NOTE: Ensure that the network selected for cluster communication is not used for
any high traffic purposes, like network storage or live-migration.
Log in to the node you want to join into an existing cluster via `ssh`.
----
- hp2# pvecm add IP-ADDRESS-CLUSTER
+ # pvecm add IP-ADDRESS-CLUSTER
----
For `IP-ADDRESS-CLUSTER`, use the IP or hostname of an existing cluster node.
.Cluster status after adding 4 nodes
----
-hp2# pvecm status
+ # pvecm status
+Cluster information
+~~~~~~~~~~~~~~~~~~~
+Name: prod-central
+Config Version: 3
+Transport: knet
+Secure auth: on
+
Quorum information
~~~~~~~~~~~~~~~~~~
-Date: Mon Apr 20 12:30:13 2015
+Date: Tue Sep 14 11:06:47 2021
Quorum provider: corosync_votequorum
Nodes: 4
Node ID: 0x00000001
-Ring ID: 1/8
+Ring ID: 1.1a8
Quorate: Yes
Votequorum information
.List nodes in a cluster
----
-hp2# pvecm nodes
+ # pvecm nodes
Membership information
~~~~~~~~~~~~~~~~~~~~~~
CAUTION: Read the procedure carefully before proceeding, as it may
not be what you want or need.
-Move all virtual machines from the node. Make sure you have made copies of any
-local data or backups that you want to keep. In the following example, we will
-remove the node hp4 from the cluster.
+Move all virtual machines from the node. Ensure that you have made copies of any
+local data or backups that you want to keep. In addition, make sure to remove
+any scheduled replication jobs to the node to be removed.
+
+CAUTION: Failure to remove replication jobs to a node before removing said node
+will result in the replication job becoming irremovable. Especially note that
+replication automatically switches direction if a replicated VM is migrated, so
+by migrating a replicated VM from a node to be deleted, replication jobs will be
+set up to that node automatically.
+
+In the following example, we will remove the node hp4 from the cluster.
Log in to a *different* cluster node (not hp4), and issue a `pvecm nodes`
command to identify the node ID to remove:
----
-hp1# pvecm nodes
+ hp1# pvecm nodes
Membership information
~~~~~~~~~~~~~~~~~~~~~~
Killing node 4
----
+NOTE: At this point, it is possible that you will receive an error message
+stating `Could not kill node (error = CS_ERR_NOT_EXIST)`. This does not
+signify an actual failure in the deletion of the node, but rather a failure in
+corosync trying to kill an offline node. Thus, it can be safely ignored.
+
Use `pvecm nodes` or `pvecm status` to check the node list again. It should
look something like:
----
hp1# pvecm status
-Quorum information
-~~~~~~~~~~~~~~~~~~
-Date: Mon Apr 20 12:44:28 2015
-Quorum provider: corosync_votequorum
-Nodes: 3
-Node ID: 0x00000001
-Ring ID: 1/8
-Quorate: Yes
+...
Votequorum information
~~~~~~~~~~~~~~~~~~~~~~
The migration type defines if the migration data should be sent over an
encrypted (`secure`) channel or an unencrypted (`insecure`) one.
-Setting the migration type to insecure means that the RAM content of a
+Setting the migration type to `insecure` means that the RAM content of a
virtual guest is also transferred unencrypted, which can lead to
information disclosure of critical data from inside the guest (for
example, passwords or encryption keys).
always sends the storage content over a secure channel.
Encryption requires a lot of computing power, so this setting is often
-changed to "unsafe" to achieve better performance. The impact on
+changed to `insecure` to achieve better performance. The impact on
modern systems is lower because they implement AES encryption in
hardware. The performance impact is particularly evident in fast
networks, where you can transfer 10 Gbps or more.
# public network
auto vmbr0
iface vmbr0 inet static
- address 192.X.Y.57
- netmask 255.255.250.0
+ address 192.X.Y.57/24
gateway 192.X.Y.1
bridge-ports eno1
bridge-stp off
# cluster network
auto eno2
iface eno2 inet static
- address 10.1.1.1
- netmask 255.255.255.0
+ address 10.1.1.1/24
# fast network
auto eno3
iface eno3 inet static
- address 10.1.2.1
- netmask 255.255.255.0
+ address 10.1.2.1/24
----
Here, we will use the network 10.1.2.0/24 as a migration network. For
projects / pve-docs.git / blobdiff