Proxmox Cluster File System (pmxcfs): Difference between revisions

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{{#pvedocs:pmxcfs-plain.html}}
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[[Category:Reference Documentation]]
[[Category:Reference Documentation]]
<pvehide>
The Proxmox Cluster file system (&#8220;pmxcfs&#8221;) is a database-driven file
system for storing configuration files, replicated in real time to all
cluster nodes using corosync. We use this to store all Proxmox VE related
configuration files.
Although the file system stores all data inside a persistent database on disk,
a copy of the data resides in RAM. This imposes restrictions on the maximum
size, which is currently 128 MiB. This is still enough to store the
configuration of several thousand virtual machines.
This system provides the following advantages:
Seamless replication of all configuration to all nodes in real time
Provides strong consistency checks to avoid duplicate VM IDs
Read-only when a node loses quorum
Automatic updates of the corosync cluster configuration to all nodes
Includes a distributed locking mechanism
POSIX Compatibility
The file system is based on FUSE, so the behavior is POSIX like. But
some feature are simply not implemented, because we do not need them:
You can just generate normal files and directories, but no symbolic
  links, &#8230;
You can&#8217;t rename non-empty directories (because this makes it easier
  to guarantee that VMIDs are unique).
You can&#8217;t change file permissions (permissions are based on paths)
O_EXCL creates were not atomic (like old NFS)
O_TRUNC creates are not atomic (FUSE restriction)
File Access Rights
All files and directories are owned by user root and have group
www-data. Only root has write permissions, but group www-data can
read most files. Files below the following paths are only accessible by root:
/etc/pve/priv/
/etc/pve/nodes/${NAME}/priv/
Technology
We use the Corosync Cluster Engine for
cluster communication, and SQlite for the
database file. The file system is implemented in user space using
FUSE.
File System Layout
The file system is mounted at:
/etc/pve
Files
authkey.pub
Public key used by the ticket system
ceph.conf
Ceph configuration file (note: /etc/ceph/ceph.conf is a symbolic link to this)
corosync.conf
Corosync cluster configuration file (prior to Proxmox VE 4.x, this file was called cluster.conf)
datacenter.cfg
Proxmox VE datacenter-wide configuration (keyboard layout, proxy, &#8230;)
domains.cfg
Proxmox VE authentication domains
firewall/cluster.fw
Firewall configuration applied to all nodes
firewall/&lt;NAME&gt;.fw
Firewall configuration for individual nodes
firewall/&lt;VMID&gt;.fw
Firewall configuration for VMs and containers
ha/crm_commands
Displays HA operations that are currently being carried out by the CRM
ha/manager_status
JSON-formatted information regarding HA services on the cluster
ha/resources.cfg
Resources managed by high availability, and their current state
nodes/&lt;NAME&gt;/config
Node-specific configuration
nodes/&lt;NAME&gt;/lxc/&lt;VMID&gt;.conf
VM configuration data for LXC containers
nodes/&lt;NAME&gt;/openvz/
Prior to Proxmox VE 4.0, used for container configuration data (deprecated, removed soon)
nodes/&lt;NAME&gt;/pve-ssl.key
Private SSL key for pve-ssl.pem
nodes/&lt;NAME&gt;/pve-ssl.pem
Public SSL certificate for web server (signed by cluster CA)
nodes/&lt;NAME&gt;/pveproxy-ssl.key
Private SSL key for pveproxy-ssl.pem (optional)
nodes/&lt;NAME&gt;/pveproxy-ssl.pem
Public SSL certificate (chain) for web server (optional override for pve-ssl.pem)
nodes/&lt;NAME&gt;/qemu-server/&lt;VMID&gt;.conf
VM configuration data for KVM VMs
priv/authkey.key
Private key used by ticket system
priv/authorized_keys
SSH keys of cluster members for authentication
priv/ceph*
Ceph authentication keys and associated capabilities
priv/known_hosts
SSH keys of the cluster members for verification
priv/lock/*
Lock files used by various services to ensure safe cluster-wide operations
priv/pve-root-ca.key
Private key of cluster CA
priv/shadow.cfg
Shadow password file for PVE Realm users
priv/storage/&lt;STORAGE-ID&gt;.pw
Contains the password of a storage in plain text
priv/tfa.cfg
Base64-encoded two-factor authentication configuration
priv/token.cfg
API token secrets of all tokens
pve-root-ca.pem
Public certificate of cluster CA
pve-www.key
Private key used for generating CSRF tokens
sdn/*
Shared configuration files for Software Defined Networking (SDN)
status.cfg
Proxmox VE external metrics server configuration
storage.cfg
Proxmox VE storage configuration
user.cfg
Proxmox VE access control configuration (users/groups/&#8230;)
virtual-guest/cpu-models.conf
For storing custom CPU models
vzdump.cron
Cluster-wide vzdump backup-job schedule
Symbolic links
Certain directories within the cluster file system use symbolic links, in order
to point to a node&#8217;s own configuration files. Thus, the files pointed to in the
table below refer to different files on each node of the cluster.
local
nodes/&lt;LOCAL_HOST_NAME&gt;
lxc
nodes/&lt;LOCAL_HOST_NAME&gt;/lxc/
openvz
nodes/&lt;LOCAL_HOST_NAME&gt;/openvz/ (deprecated, removed soon)
qemu-server
nodes/&lt;LOCAL_HOST_NAME&gt;/qemu-server/
Special status files for debugging (JSON)
.version
File versions (to detect file modifications)
.members
Info about cluster members
.vmlist
List of all VMs
.clusterlog
Cluster log (last 50 entries)
.rrd
RRD data (most recent entries)
Enable/Disable debugging
You can enable verbose syslog messages with:
echo "1" &gt;/etc/pve/.debug
And disable verbose syslog messages with:
echo "0" &gt;/etc/pve/.debug
Recovery
If you have major problems with your Proxmox VE host, for example hardware
issues, it could be helpful to copy the pmxcfs database file
/var/lib/pve-cluster/config.db, and move it to a new Proxmox VE
host. On the new host (with nothing running), you need to stop the
pve-cluster service and replace the config.db file (required permissions
0600). Following this, adapt /etc/hostname and /etc/hosts according to the
lost Proxmox VE host, then reboot and check (and don&#8217;t forget your
VM/CT data).
Remove Cluster Configuration
The recommended way is to reinstall the node after you remove it from
your cluster. This ensures that all secret cluster/ssh keys and any
shared configuration data is destroyed.
In some cases, you might prefer to put a node back to local mode without
reinstalling, which is described in
Separate A Node Without Reinstalling
Recovering/Moving Guests from Failed Nodes
For the guest configuration files in nodes/&lt;NAME&gt;/qemu-server/ (VMs) and
nodes/&lt;NAME&gt;/lxc/ (containers), Proxmox VE sees the containing node &lt;NAME&gt; as the
owner of the respective guest. This concept enables the usage of local locks
instead of expensive cluster-wide locks for preventing concurrent guest
configuration changes.
As a consequence, if the owning node of a guest fails (for example, due to a power
outage, fencing event, etc.), a regular migration is not possible (even if all
the disks are located on shared storage), because such a local lock on the
(offline) owning node is unobtainable. This is not a problem for HA-managed
guests, as Proxmox VE&#8217;s High Availability stack includes the necessary
(cluster-wide) locking and watchdog functionality to ensure correct and
automatic recovery of guests from fenced nodes.
If a non-HA-managed guest has only shared disks (and no other local resources
which are only available on the failed node), a manual recovery
is possible by simply moving the guest configuration file from the failed
node&#8217;s directory in /etc/pve/ to an online node&#8217;s directory (which changes the
logical owner or location of the guest).
For example, recovering the VM with ID 100 from an offline node1 to another
node node2 works by running the following command as root on any member node
of the cluster:
mv /etc/pve/nodes/node1/qemu-server/100.conf /etc/pve/nodes/node2/qemu-server/
Before manually recovering a guest like this, make absolutely sure
that the failed source node is really powered off/fenced. Otherwise Proxmox VE&#8217;s
locking principles are violated by the mv command, which can have unexpected
consequences.
Guests with local disks (or other local resources which are only
available on the offline node) are not recoverable like this. Either wait for the
failed node to rejoin the cluster or restore such guests from backups.
</pvehide>
<!--PVE_IMPORT_END_MARKER-->

Latest revision as of 14:11, 23 November 2023

The Proxmox Cluster file system (“pmxcfs”) is a database-driven file system for storing configuration files, replicated in real time to all cluster nodes using corosync. We use this to store all Proxmox VE related configuration files.

Although the file system stores all data inside a persistent database on disk, a copy of the data resides in RAM. This imposes restrictions on the maximum size, which is currently 128 MiB. This is still enough to store the configuration of several thousand virtual machines.

This system provides the following advantages:

  • Seamless replication of all configuration to all nodes in real time

  • Provides strong consistency checks to avoid duplicate VM IDs

  • Read-only when a node loses quorum

  • Automatic updates of the corosync cluster configuration to all nodes

  • Includes a distributed locking mechanism

POSIX Compatibility

The file system is based on FUSE, so the behavior is POSIX like. But some feature are simply not implemented, because we do not need them:

  • You can just generate normal files and directories, but no symbolic links, …

  • You can’t rename non-empty directories (because this makes it easier to guarantee that VMIDs are unique).

  • You can’t change file permissions (permissions are based on paths)

  • O_EXCL creates were not atomic (like old NFS)

  • O_TRUNC creates are not atomic (FUSE restriction)

File Access Rights

All files and directories are owned by user root and have group www-data. Only root has write permissions, but group www-data can read most files. Files below the following paths are only accessible by root:

/etc/pve/priv/
/etc/pve/nodes/${NAME}/priv/

Technology

We use the Corosync Cluster Engine for cluster communication, and SQlite for the database file. The file system is implemented in user space using FUSE.

File System Layout

The file system is mounted at:

/etc/pve

Files

authkey.pub

Public key used by the ticket system

ceph.conf

Ceph configuration file (note: /etc/ceph/ceph.conf is a symbolic link to this)

corosync.conf

Corosync cluster configuration file (prior to Proxmox VE 4.x, this file was called cluster.conf)

datacenter.cfg

Proxmox VE datacenter-wide configuration (keyboard layout, proxy, …)

domains.cfg

Proxmox VE authentication domains

firewall/cluster.fw

Firewall configuration applied to all nodes

firewall/<NAME>.fw

Firewall configuration for individual nodes

firewall/<VMID>.fw

Firewall configuration for VMs and containers

ha/crm_commands

Displays HA operations that are currently being carried out by the CRM

ha/manager_status

JSON-formatted information regarding HA services on the cluster

ha/resources.cfg

Resources managed by high availability, and their current state

nodes/<NAME>/config

Node-specific configuration

nodes/<NAME>/lxc/<VMID>.conf

VM configuration data for LXC containers

nodes/<NAME>/openvz/

Prior to Proxmox VE 4.0, used for container configuration data (deprecated, removed soon)

nodes/<NAME>/pve-ssl.key

Private SSL key for pve-ssl.pem

nodes/<NAME>/pve-ssl.pem

Public SSL certificate for web server (signed by cluster CA)

nodes/<NAME>/pveproxy-ssl.key

Private SSL key for pveproxy-ssl.pem (optional)

nodes/<NAME>/pveproxy-ssl.pem

Public SSL certificate (chain) for web server (optional override for pve-ssl.pem)

nodes/<NAME>/qemu-server/<VMID>.conf

VM configuration data for KVM VMs

priv/authkey.key

Private key used by ticket system

priv/authorized_keys

SSH keys of cluster members for authentication

priv/ceph*

Ceph authentication keys and associated capabilities

priv/known_hosts

SSH keys of the cluster members for verification

priv/lock/*

Lock files used by various services to ensure safe cluster-wide operations

priv/pve-root-ca.key

Private key of cluster CA

priv/shadow.cfg

Shadow password file for PVE Realm users

priv/storage/<STORAGE-ID>.pw

Contains the password of a storage in plain text

priv/tfa.cfg

Base64-encoded two-factor authentication configuration

priv/token.cfg

API token secrets of all tokens

pve-root-ca.pem

Public certificate of cluster CA

pve-www.key

Private key used for generating CSRF tokens

sdn/*

Shared configuration files for Software Defined Networking (SDN)

status.cfg

Proxmox VE external metrics server configuration

storage.cfg

Proxmox VE storage configuration

user.cfg

Proxmox VE access control configuration (users/groups/…)

virtual-guest/cpu-models.conf

For storing custom CPU models

vzdump.cron

Cluster-wide vzdump backup-job schedule

Certain directories within the cluster file system use symbolic links, in order to point to a node’s own configuration files. Thus, the files pointed to in the table below refer to different files on each node of the cluster.

local

nodes/<LOCAL_HOST_NAME>

lxc

nodes/<LOCAL_HOST_NAME>/lxc/

openvz

nodes/<LOCAL_HOST_NAME>/openvz/ (deprecated, removed soon)

qemu-server

nodes/<LOCAL_HOST_NAME>/qemu-server/

Special status files for debugging (JSON)

.version

File versions (to detect file modifications)

.members

Info about cluster members

.vmlist

List of all VMs

.clusterlog

Cluster log (last 50 entries)

.rrd

RRD data (most recent entries)

Enable/Disable debugging

You can enable verbose syslog messages with:

echo "1" >/etc/pve/.debug

And disable verbose syslog messages with:

echo "0" >/etc/pve/.debug

Recovery

If you have major problems with your Proxmox VE host, for example hardware issues, it could be helpful to copy the pmxcfs database file /var/lib/pve-cluster/config.db, and move it to a new Proxmox VE host. On the new host (with nothing running), you need to stop the pve-cluster service and replace the config.db file (required permissions 0600). Following this, adapt /etc/hostname and /etc/hosts according to the lost Proxmox VE host, then reboot and check (and don’t forget your VM/CT data).

Remove Cluster Configuration

The recommended way is to reinstall the node after you remove it from your cluster. This ensures that all secret cluster/ssh keys and any shared configuration data is destroyed.

In some cases, you might prefer to put a node back to local mode without reinstalling, which is described in Separate A Node Without Reinstalling

Recovering/Moving Guests from Failed Nodes

For the guest configuration files in nodes/<NAME>/qemu-server/ (VMs) and nodes/<NAME>/lxc/ (containers), Proxmox VE sees the containing node <NAME> as the owner of the respective guest. This concept enables the usage of local locks instead of expensive cluster-wide locks for preventing concurrent guest configuration changes.

As a consequence, if the owning node of a guest fails (for example, due to a power outage, fencing event, etc.), a regular migration is not possible (even if all the disks are located on shared storage), because such a local lock on the (offline) owning node is unobtainable. This is not a problem for HA-managed guests, as Proxmox VE’s High Availability stack includes the necessary (cluster-wide) locking and watchdog functionality to ensure correct and automatic recovery of guests from fenced nodes.

If a non-HA-managed guest has only shared disks (and no other local resources which are only available on the failed node), a manual recovery is possible by simply moving the guest configuration file from the failed node’s directory in /etc/pve/ to an online node’s directory (which changes the logical owner or location of the guest).

For example, recovering the VM with ID 100 from an offline node1 to another node node2 works by running the following command as root on any member node of the cluster:

mv /etc/pve/nodes/node1/qemu-server/100.conf /etc/pve/nodes/node2/qemu-server/
Warning Before manually recovering a guest like this, make absolutely sure that the failed source node is really powered off/fenced. Otherwise Proxmox VE’s locking principles are violated by the mv command, which can have unexpected consequences.
Warning Guests with local disks (or other local resources which are only available on the offline node) are not recoverable like this. Either wait for the failed node to rejoin the cluster or restore such guests from backups.