Let us take a closer at how to Access the firewall Proxmox terminal in a few simple steps with the support of our Server Management Services at Bobcares.

Access firewall Proxmox terminal

Proxmox VE Firewall provides an easy method to protect your IT framework. You can set up firewall rules for all hosts inside a cluster or even define rules for virtual machines and containers. These characteristics include security groups, firewall macros, IP sets, and aliases that help to make tasks easier.

While all configuration stored on the cluster file system likewise the iptables-based firewall services run on each cluster node, and hence provide full isolation between virtual machines. The distributed nature of these systems provides a good higher bandwidth than any other central firewall solution.

Configuration Files

Firewall-related configurations are stored in the Proxmox cluster file system, so those files are automatically distributed to all cluster nodes. Meanwhile, the pve-firewall service updates the underlying iptables rules automatically on changes.

Cluster Wide Setup

The cluster-wide firewall configuration stored at:

/etc/pve/firewall/cluster.fw

The configuration can contain the following sections:

• [OPTIONS]: Used to set cluster-wide firewall options.

• ebtables: <boolean> (default = 1): Enable ebtables rules cluster wide. enable: <integer> (0 – N): Enable or disable the firewall cluster wide.

• log_ratelimit: [enable=]<1|0> [,burst=<integer>] [,rate=<rate>]: Log ratelimiting settings

• burst=<integer> (0 – N) (default = 5): Initial burst of packages which will always get logged before the rate is applied

• enable=<boolean> (default = 1): Enable or disable log rate limiting

• rate=<rate> (default = 1/second) : Frequency with which the burst bucket gets refilled

• policy_in: <ACCEPT | DROP | REJECT> : Input policy.

• policy_out: :Output policy.

• [RULES]: This section contains cluster-wide firewall rules for all nodes.

• [IPSET <name>]: Cluster wide IP set definitions.

• [GROUP <name>]: Cluster wide security group definitions.

• [ALIASES] : Cluster-wide Alias definitions.

Enabling the Firewall

Enabling the firewall will block traffic to all hosts by default. The only exceptions are WebGUI(8006) and ssh(22) from your local network. Usually, the firewall will completely disable by default, so you can simply set the enable option here:

[OPTIONS]
# enable firewall (cluster-wide setting, default is disabled)
enable: 1

To administrate your Proxmox VE hosts from the remote you just need to create rules that allow traffic from remote IPs to the web GUI (port 8006). Also, you may need to allow ssh “port 22”, and SPICE “port 3128”.

Next, open an SSH connection to one of Proxmox VE hosts before enabling the firewall, this way you will still have access to the host if something goes wrong.

To make the task easier, you can create an IPSet called “management” and add all remote IPs there. This creates all required firewall rules to access the GUI from a remote.

Here are a few CLI commands to manage the Proxmox VE firewall:

To start a firewall service:

# pve-firewall start

Stop a firewall service:

# pve-firewall stop

Check the status of the firewall service:

# pve-firewall status

To view the created iptables rules:

# iptables-save

Edit a cluster-specific firewall:

# nano /etc/pve/firewall/cluster.fw

To edit a host-specific firewall:

# nano /etc/pve/nodes/<node_name>/host.fw

Edit a VM-specific rule:

# nano /etc/pve/firewall/<vm_id>.fw

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Conclusion

To sum up, each virtual network device has its own firewall-enabled flag, so you can choose to enable the firewall for each interface. This is required in addition to the general firewall enabling the option.