From 11a63e96e66d79d34a33efbe0c4b8e4b0694b062 Mon Sep 17 00:00:00 2001
From: RealStickman <git-sync@trilby.media>
Date: Fri, 20 May 2022 21:03:52 +0200
Subject: [PATCH] (Grav GitSync) Automatic Commit from RealStickman

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+---
+title: 'XCP-ng Xen Orchestra'
+---
+
+## Installation
+> Use the script [XenOrchestraInstallerUpdater](https://github.com/ronivay/XenOrchestraInstallerUpdater) to install Xen Orchestra from sources.  
+{.is-info}
+
+### Installation within VM
+The supported distibutions are listed in the Github README.  
+The script can be run with `# ./xo-install.sh --install`  
+
+### Installation from dom0
+For an installation from dom0, you can deploy a premade VM.  
+Run `# xo-vm-import.sh` to import that VM.  
+
+### Installation as container
+You need to explicitly allow host loopback for the container, or it won't be able to access the local ssh tunnel we'll create later  
+We'll need to enter the server on 10.0.2.2 with the local port we gave our ssh tunnel  
+```
+# podman run -itd --name xen-orchestra \
+    --net slirp4netns:allow_host_loopback=true \
+    -p 8080:80 \
+    docker.io/ronivay/xen-orchestra
+```
+
+## Secure Connection to Xenserver
+By default, dom0 exposes the Xen API on port 443. However, in public settings this would be a security risk, as anyone with enough time could find the access password.  
+A local SSH tunnel is established, forwarding port 443 on dom0 instead.  
+One prerequisite is ssh-key based access to dom0 from the xen orchestra VM. See [SSH](/remote/ssh)  
+
+> Based on testing and [this forum post](https://xen-orchestra.com/forum/topic/528/connection-port-in-settings-servers-not-used-for-console) it is known the Xen API returns the dom0 public IP address for additional connections within Xen Orchestra. This includes the VM console and usage statistics for example.
+{.is-info}
+
+To work around this issue, a firewall rule can be used to redirect traffic outbound to dom0 on port 443 to the local ssh tunnel instead.  
+
+### SSH Tunnel
+To start and stop the tunnel automatically a systemd service is used. It is a special kind of service, similar to wireguards `wg-quick@(vpn config)` in its function.  
+
+`/etc/systemd/system/local-tunnel@.service`  
+```
+[Unit]
+Description=Setup a local tunnel to %I
+After=network.target
+
+[Service]
+EnvironmentFile=/etc/default/local-tunnel@%i
+ExecStart=/usr/bin/ssh -i ${PATH_TO_KEY} -o ServerAliveInterval=60 -o ExitOnForwardFailure=yes -nNT -L ${LOCAL_PORT}:${REMOTE_ADDR}:${REMOTE_PORT} ${REMOTE_USER}@${REMOTE_HOST}
+RestartSec=15
+Restart=always
+KillMode=mixed
+
+[Install]
+WantedBy=multi-user.target
+```
+
+The corresponding config looks as follows:  
+`/etc/default/local-tunnel@evileye`  
+```
+PATH_TO_KEY=(path to key)
+LOCAL_PORT=(local port, e.g. 4853)
+REMOTE_ADDR=(destination, e.g. 182.52.32.12)
+REMOTE_PORT=443
+REMOTE_USER=(remote user)
+REMOTE_HOST=(also destination in this case)
+```
+
+This service can be enabled and started with this command.  
+`# systemctl enable --now local-tunnel@evileye.service`  
+
+### Firewall Redirection
+`firewalld` will be used as firewall and to implement the redirection rule.  
+
+Make sure to enable the firewalld service  
+`# systemctl enable --now firewalld`  
+
+This command implements a redirection rule for packets to *destination* with *destination port*. Packets are redirected to localhost:*port*. The *target port* should be the local port of the local SSH tunnel.  
+`# firewall-cmd --permanent --direct --add-rule ipv4 nat OUTPUT 0 -d (destination) -p tcp --dport (dest. port) -j DNAT --to-destination 127.0.0.1:(target port)`  
+
+This type of rule can be viewed with the following command:  
+`# firewall-cmd --direct --get-rules ipv4 nat OUTPUT`  
+
+To remove this rule again, edit `/etc/firewalld/direct.xml`  
+
+## Firewalld
+This section provides documentation on basic firewall usage. For example, allowing port 22/tcp for ssh with `firewalld`.  
+
+> In general, [this guide by Digital Ocean](https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-using-firewalld-on-centos-7) provides a good starting point.  
+{.is-info}
+
+For this Host the services `http`, `https` and `ssh` are allowed.  
+
+## VM Backups
+### Exclude VM Disks from Backup
+To exclude disks from backup jobs, one can prepend the disk name with `[NOBAK]`  
+> Also see [the official documentation](https://xen-orchestra.com/docs/backups.html#exclude-disks)  
+{.is-info}