Migrate idrac documentation to sysadm docs

The default credentials for dell and supermicro have been installed in the creds store.

Related to T3154

sysadm/network-architecture/idrac.rst

+.. _idrac:
+
+iDRAC
+=====
+
+.. admonition:: Intended audience
+   :class: important
+
+   sysadm staff members
+
+The **integrated Dell Remote Access Controller** is the remote console that's to control
+servers (e.g DELL, ...).
+
+We currently have :ref:`5 iDRACs <network_configuration>`:
+
+* banco
+* beaubourg
+* hypervisor3
+* orsay
+* uffizi
+
+These instructions are not really vendor-specific and can also be useful for generic
+IPMI access or even other kinds of out-of-band management system implementations.
+
+.. _connection_how_to:
+
+Connection how to
+-----------------
+
+You will need to install the following packages on your local machine:
+
+* `sshuttle <https://tracker.debian.org/pkg/sshuttle>`_
+* `icedtea-8-plugin <https://tracker.debian.org/pkg/icedtea-web>`_
+
+On debian like machines:
+
+.. code::
+
+   apt install sshuttle icedtea-8-plugin
+
+sshuttle
+~~~~~~~~
+
+sshuttle uses firewall rules to redirect traffic to a set of ip addresses via a SSH
+tunnel.
+
+By default, you can run sshuttle as your own user. This will forward all TCP packets to
+any hosts through the tunnel.
+
+To be able to use UDP (e.g. for the IPMI SoL), you need to run sshuttle as root with the
+tproxy method.
+
+This may need some `specific routing setup
+<https://sshuttle.readthedocs.io/en/stable/tproxy.html>`_ to work; for instance, in
+``/etc/network/interfaces``:
+
+.. code::
+
+   # This file describes the network interfaces available on your system
+   # and how to activate them. For more information, see interfaces(5).
+   source /etc/network/interfaces.d/*
+   # The loopback network interface
+   auto lo
+   iface lo inet loopback
+       up ip route add local default dev lo table 100
+       up ip rule add fwmark 1 lookup 100
+       up ip -6 route add local default dev lo table 100
+       up ip -6 rule add fwmark 1 lookup 100
+
+Once this is setup and the marked packets are properly routed, sshuttle's tproxy method
+can do its work:
+
+.. code::
+
+   $ ssh-add .ssh/id_ed25519.inria # or whatever your ssh key is
+   $ sudo SSH_AUTH_SOCK="$SSH_AUTH_SOCK" sshuttle --python python3 \
+       --method tproxy \
+       -r ${username}@sesi-ssh.inria.fr 128.93.162.142 128.93.134.0/27
+
+Authentication
+--------------
+
+Usernames and passwords for logging in are in the :ref:`credentials storage
+<how_to_manage_creds_store>`, under ``infra/HOSTNAME/idrac``
+
+If not found, check the default DELL or Supermicro/IPMI credentials which are under
+``infra/idrac/{dell,supermicro-ipmi}``.
+
+.. _management_network:
+
+Management network
+------------------
+
+Look up the hostname of the management interface you want to access in the `inventory
+<https://inventory.internal.softwareheritage.org/ipam/prefixes/9/ip-addresses/>`_.
+
+The machines hosted in the main Software Heritage bay at Rocquencourt use the
+128.93.134.0/27 network.
+
+The first usable IP address is **128.93.134.1** and the last one **128.93.134.29**.
+
+**128.93.134.30** is a gateway.
+
+.. _connect_to_the_serial_console:
+
+Connect to the serial console
+-----------------------------
+
+The console can be unavailable on the webui on servers with an expired license. The
+serial console can still be used. Example:
+
+.. code::
+
+   ipmitool -I lanplus -H swh-es3-adm.inria.fr -U root -P  sol activate
+
+NOTE: This command is available on the ``ipmitool`` package.

sysadm/network-architecture/index.rst

@@ -11,3 +11,4 @@ Network architecture
    how-to-access-firewall-settings
    how-to-upgrade-firewall-os
    service-urls
+   idrac

[Phabricator Migration user]

Some references in the commit message have been migrated:

• T3154 is now swh/infra/sysadm-environment#3154 (closed)