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vyos-documentation/docs/configuration-overview.rst
Cédric Jeanneret 5f0d33af1a Correct the scp URI 
A standard `scp` call implies a ":" between the remote host
and the remote path. Let's reflect it in the doc to avoid
any confusion.
2020-10-26 19:28:17 +01:00

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.. _configuration-overview:
######################
Configuration Overview
######################
VyOS makes use of a unified configuration file for the entire system's
configuration: ``/config/config.boot``. This allows easy template
creation, backup, and replication of system configuration. A system can
thus also be easily cloned by simply copying the required configuration
files.
Terminology
===========
live
A VyOS system has three major types of configurations:
* **Active** or **running configuration** is the system configuration
that is loaded and currently active (used by VyOS). Any change in
the configuration will have to be committed to belong to the
active/running configuration.
* **Working configuration** is the one that is currently being modified
in configuration mode. Changes made to the working configuration do
not go into effect until the changes are committed with the
:cfgcmd:`commit` command. At which time the working configuration will
become the active or running configuration.
* **Saved configuration** is the one saved to a file using the
:cfgcmd:`save` command. It allows you to keep safe a configuration for
future uses. There can be multiple configuration files. The default or
"boot" configuration is saved and loaded from the file
``/config/config.boot``.
Seeing and navigating the configuration
=======================================
.. opcmd:: show configuration
View the current active configuration, also known as the running
configuration, from the operational mode.
.. code-block:: none
vyos@vyos:~$ show configuration
interfaces {
ethernet eth0 {
address dhcp
hw-id 00:53:00:00:aa:01
}
loopback lo {
}
}
service {
ssh {
port 22
}
}
system {
config-management {
commit-revisions 20
}
console {
device ttyS0 {
speed 9600
}
}
login {
user vyos {
authentication {
encrypted-password ****************
}
level admin
}
}
ntp {
server 0.pool.ntp.org {
}
server 1.pool.ntp.org {
}
server 2.pool.ntp.org {
}
}
syslog {
global {
facility all {
level notice
}
facility protocols {
level debug
}
}
}
}
By default, the configuration is displayed in a hierarchy like the above
example, this is only one of the possible ways to display the
configuration. When the configuration is generated and the device is
configured, changes are added through a collection of :cfgcmd:`set` and
:cfgcmd:`delete` commands.
.. opcmd:: show configuration commands
Get a collection of all the set commands required which led to the
running configuration.
.. code-block:: none
vyos@vyos:~$ show configuration commands
set interfaces ethernet eth0 address 'dhcp'
set interfaces ethernet eth0 hw-id '00:53:dd:44:3b:0f'
set interfaces loopback 'lo'
set service ssh port '22'
set system config-management commit-revisions '20'
set system console device ttyS0 speed '9600'
set system login user vyos authentication encrypted-password '$6$Vt68...QzF0'
set system login user vyos level 'admin'
set system ntp server '0.pool.ntp.org'
set system ntp server '1.pool.ntp.org'
set system ntp server '2.pool.ntp.org'
set system syslog global facility all level 'notice'
set system syslog global facility protocols level 'debug'
Both these ``show`` commands should be executed when in operational
mode, they do not work directly in configuration mode. There is a
special way on how to :ref:`run_opmode_from_config_mode`.
.. hint:: Use the ``show configuration commands | strip-private``
command when you want to hide private data. You may want to do so if
you want to share your configuration on the `forum`_.
.. _`forum`: https://forum.vyos.io
The config mode
---------------
When entering the configuration mode you are navigating inside a tree
structure, to enter configuration mode enter the command
:opcmd:`configure` when in operational mode.
.. code-block:: none
vyos@vyos$ configure
[edit]
vyos@vyos#
.. note:: When going into configuration mode, prompt changes from
``$`` to ``#``.
All commands executed here are relative to the configuration level you
have entered. You can do everything from the top level, but commands
will be quite lengthy when manually typing them.
The current hierarchy level can be changed by the :cfgcmd:`edit`
command.
.. code-block:: none
[edit]
vyos@vyos# edit interfaces ethernet eth0
[edit interfaces ethernet eth0]
vyos@vyos#
You are now in a sublevel relative to ``interfaces ethernet eth0``, all
commands executed from this point on are relative to this sublevel. Use
eithe the :cfgcmd:`top` or :cfgcmd:`exit` command to go back to the top
of the hierarchy. You can also use the :cfgcmd:`up` command to move only
one level up at a time.
.. cfgcmd:: show
The :cfgcmd:`show` command within configuration mode will show the
working configuration indicating line changes with ``+`` for additions,
``>`` for replacements and ``-`` for deletions.
**Example:**
.. code-block:: none
vyos@vyos:~$ configure
[edit]
vyos@vyos# show interfaces
ethernet eth0 {
description MY_OLD_DESCRIPTION
disable
hw-id 00:53:dd:44:3b:03
}
loopback lo {
}
[edit]
vyos@vyos# set interfaces ethernet eth0 address dhcp
[edit]
vyos@vyos# set interfaces ethernet eth0 description MY_NEW_DESCRIPTION
[edit]
vyos@vyos# delete interfaces ethernet eth0 disable
[edit]
vyos@vyos# show interfaces
ethernet eth0 {
+ address dhcp
> description MY_NEW_DESCRIPTION
- disable
hw-id 00:53:dd:44:3b:03
}
loopback lo {
}
It is also possible to display all `set` commands within configuration
mode using :cfgcmd:`show | commands`
.. code-block:: none
vyos@vyos# show interfaces ethernet eth0 | commands
set address dhcp
set hw-id 00:53:ad:44:3b:03
These commands are also relative to the level you are inside and only
relevant configuration blocks will be displayed when entering a
sub-level.
.. code-block:: none
[edit interfaces ethernet eth0]
vyos@vyos# show
address dhcp
hw-id 00:53:ad:44:3b:03
Exiting from the configuration mode is done via the :cfgcmd:`exit`
command from the top level, executing :cfgcmd:`exit` from within a
sub-level takes you back to the top level.
.. code-block:: none
[edit interfaces ethernet eth0]
vyos@vyos# exit
[edit]
vyos@vyos# exit
Warning: configuration changes have not been saved.
Editing the configuration
=========================
The configuration can be edited by the use of :cfgcmd:`set` and
:cfgcmd:`delete` commands from within configuration mode.
.. cfgcmd:: set
Use this command to set the value of a parameter or to create a new
element.
Configuration commands are flattened from the tree into 'one-liner'
commands shown in :opcmd:`show configuration commands` from operation
mode. Commands are relative to the level where they are executed and all
redundant information from the current level is removed from the command
entered.
.. code-block:: none
[edit]
vyos@vyos# set interface ethernet eth0 address 192.0.2.100/24
.. code-block:: none
[edit interfaces ethernet eth0]
vyos@vyos# set address 203.0.113.6/24
These two commands above are essentially the same, just executed from
different levels in the hierarchy.
.. cfgcmd:: delete
To delete a configuration entry use the :cfgcmd:`delete` command,
this also deletes all sub-levels under the current level you've
specified in the :cfgcmd:`delete` command. Deleting an entry will
also result in the element reverting back to its default value if one
exists.
.. code-block:: none
[edit interfaces ethernet eth0]
vyos@vyos# delete address 192.0.2.100/24
.. cfgcmd:: commit
Any change you do on the configuration, will not take effect until
committed using the :cfgcmd:`commit` command in configuration mode.
.. code-block:: none
vyos@vyos# commit
[edit]
vyos@vyos# exit
Warning: configuration changes have not been saved.
vyos@vyos:~$
.. _save:
.. cfgcmd:: save
Use this command to preserve configuration changes upon reboot. By
default it is stored at */config/config.boot*. In the case you want
to store the configuration file somewhere else, you can add a local
path, an SCP address, an FTP address or a TFTP address.
.. code-block:: none
vyos@vyos# save
Saving configuration to '/config/config.boot'...
Done
.. code-block:: none
vyos@vyos# save [tab]
Possible completions:
<Enter> Save to system config file
<file> Save to file on local machine
scp://<user>:<passwd>@<host>:/<file> Save to file on remote machine
ftp://<user>:<passwd>@<host>/<file> Save to file on remote machine
tftp://<host>/<file> Save to file on remote machine
vyos@vyos# save tftp://192.168.0.100/vyos-test.config.boot
Saving configuration to 'tftp://192.168.0.100/vyos-test.config.boot'...
######################################################################## 100.0%
Done
.. cfgcmd:: exit [discard]
Configuration mode can not be exited while uncommitted changes exist.
To exit configuration mode without applying changes, the
:cfgcmd:`exit discard` command must be used.
All changes in the working config will thus be lost.
.. code-block:: none
vyos@vyos# exit
Cannot exit: configuration modified.
Use 'exit discard' to discard the changes and exit.
[edit]
vyos@vyos# exit discard
.. cfgcmd:: commit-confirm <minutes>
Use this command to temporarily commit your changes and set the
number of minutes available for validation. ``confirm`` must
be entered within those minutes, otherwise the system will reboot
into the previous configuration. The default value is 10 minutes.
What if you are doing something dangerous? Suppose you want to setup
a firewall, and you are not sure there are no mistakes that will lock
you out of your system. You can use confirmed commit. If you issue
the ``commit-confirm`` command, your changes will be commited, and if
you don't issue issue the ``confirm`` command in 10 minutes, your
system will reboot into previous config revision.
.. code-block:: none
vyos@router# set interfaces ethernet eth0 firewall local name FromWorld
vyos@router# commit-confirm
commit confirm will be automatically reboot in 10 minutes unless confirmed
Proceed? [confirm]y
[edit]
vyos@router# confirm
[edit]
.. note:: A reboot because you did not enter ``confirm`` will not
take you necessarily to the *saved configuration*, but to the
point before the unfortunate commit.
.. cfgcmd:: copy
Copy a configuration element.
You can copy and remove configuration subtrees. Suppose you set up a
firewall ruleset ``FromWorld`` with one rule that allows traffic from
specific subnet. Now you want to setup a similar rule, but for
different subnet. Change your edit level to
``firewall name FromWorld`` and use ``copy rule 10 to rule 20``, then
modify rule 20.
.. code-block:: none
vyos@router# show firewall name FromWorld
default-action drop
rule 10 {
action accept
source {
address 203.0.113.0/24
}
}
[edit]
vyos@router# edit firewall name FromWorld
[edit firewall name FromWorld]
vyos@router# copy rule 10 to rule 20
[edit firewall name FromWorld]
vyos@router# set rule 20 source address 198.51.100.0/24
[edit firewall name FromWorld]
vyos@router# commit
[edit firewall name FromWorld]
.. cfgcmd:: rename
Rename a configuration element.
You can also rename config subtrees:
.. code-block:: none
vyos@router# rename rule 10 to rule 5
[edit firewall name FromWorld]
vyos@router# commit
[edit firewall name FromWorld]
Note that ``show`` command respects your edit level and from this
level you can view the modified firewall ruleset with just ``show``
with no parameters.
.. code-block:: none
vyos@router# show
default-action drop
rule 5 {
action accept
source {
address 203.0.113.0/24
}
}
rule 20 {
action accept
source {
address 198.51.100.0/24
}
}
.. cfgcmd:: comment <config node> "comment text"
Add comment as an annotation to a configuration node.
The ``comment`` command allows you to insert a comment above the
``<config node>`` configuration section. When shown, comments are
enclosed with ``/*`` and ``*/`` as open/close delimiters. Comments
need to be commited, just like other config changes.
To remove an existing comment from your current configuration,
specify an empty string enclosed in double quote marks (``""``) as
the comment text.
Example:
.. code-block:: none
vyos@vyos# comment firewall all-ping "Yes I know this VyOS is cool"
vyos@vyos# commit
vyos@vyos# show
firewall {
/* Yes I know this VyOS is cool */
all-ping enable
broadcast-ping disable
...
}
.. note:: An important thing to note is that since the comment is
added on top of the section, it will not appear if the ``show
<section>`` command is used. With the above example, the `show
firewall` command would return starting after the ``firewall
{`` line, hiding the comment.
.. _run_opmode_from_config_mode:
Access opmode from config mode
==============================
When inside configuration mode you are not directly able to execute
operational commands.
.. cfgcmd:: run
Access to these commands are possible through the use of the
``run [command]`` command. From this command you will have access to
everything accessible from operational mode.
Command completion and syntax help with ``?`` and ``[tab]`` will also
work.
.. code-block:: none
[edit]
vyos@vyos# run show interfaces
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface IP Address S/L Description
--------- ---------- --- -----------
eth0 0.0.0.0/0 u/u
Managing configurations
=======================
VyOS comes with an integrated versioning system for the system
configuration. It automatically maintains a backup of every previous
configuration which has been committed to the system. The configurations
are versioned locally for rollback but they can also be stored on a
remote host for archiving/backup reasons.
Local Archive
-------------
Revisions are stored on disk. You can view, compare and rollback them to
any previous revisions if something goes wrong.
.. opcmd:: show system commit
View all existing revisions on the local system.
.. code-block:: none
vyos@vyos:~$ show system commit
0 2015-03-30 08:53:03 by vyos via cli
1 2015-03-30 08:52:20 by vyos via cli
2 2015-03-26 21:26:01 by root via boot-config-loader
3 2015-03-26 20:43:18 by root via boot-config-loader
4 2015-03-25 11:06:14 by root via boot-config-loader
5 2015-03-25 01:04:28 by root via boot-config-loader
6 2015-03-25 00:16:47 by vyos via cli
7 2015-03-24 23:43:45 by root via boot-config-loader
.. cfgcmd:: set system config-management commit-revisions <N>
You can specify the number of revisions stored on disk. N can be in
the range of 0 - 65535. When the number of revisions exceeds the
configured value, the oldest revision is removed. The default setting
for this value is to store 100 revisions locally.
Compare configurations
----------------------
VyOS lets you compare different configurations.
.. cfgcmd:: compare <saved | N> <M>
Use this command to spot what the differences are between different
configurations.
.. code-block:: none
vyos@vyos# compare [tab]
Possible completions:
<Enter> Compare working & active configurations
saved Compare working & saved configurations
<N> Compare working with revision N
<N> <M> Compare revision N with M
Revisions:
0 2013-12-17 20:01:37 root by boot-config-loader
1 2013-12-13 15:59:31 root by boot-config-loader
2 2013-12-12 21:56:22 vyos by cli
3 2013-12-12 21:55:11 vyos by cli
4 2013-12-12 21:27:54 vyos by cli
5 2013-12-12 21:23:29 vyos by cli
6 2013-12-12 21:13:59 root by boot-config-loader
7 2013-12-12 16:25:19 vyos by cli
8 2013-12-12 15:44:36 vyos by cli
9 2013-12-12 15:42:07 root by boot-config-loader
10 2013-12-12 15:42:06 root by init
The command :cfgcmd:`compare` allows you to compare different type of
configurations. It also lets you compare different revisions through
the :cfgcmd:`compare N M` command, where N and M are revision
numbers. The output will describe how the configuration N is when
compared to M indicating with a plus sign (``+``) the additional
parts N has when compared to M, and indicating with a minus sign
(``-``) the lacking parts N misses when compared to M.
.. code-block:: none
vyos@vyos# compare 0 6
[edit interfaces]
+dummy dum1 {
+ address 10.189.0.1/31
+}
[edit interfaces ethernet eth0]
+vif 99 {
+ address 10.199.0.1/31
+}
-vif 900 {
- address 192.0.2.4/24
-}
.. opcmd:: show system commit diff <number>
Show commit revision difference.
The command above also lets you see the difference between two commits.
By default the difference with the running config is shown.
.. code-block:: none
vyos@router# run show system commit diff 4
[edit system]
+ipv6 {
+ disable-forwarding
+}
This means four commits ago we did ``set system ipv6 disable-forwarding``.
Rollback Changes
----------------
You can rollback configuration changes using the rollback command. This
will apply the selected revision and trigger a system reboot.
.. cfgcmd:: rollback <N>
Rollback to revision N (currently requires reboot)
.. code-block:: none
vyos@vyos# compare 1
[edit system]
>host-name vyos-1
[edit]
vyos@vyos# rollback 1
Proceed with reboot? [confirm][y]
Broadcast message from root@vyos-1 (pts/0) (Tue Dec 17 21:07:45 2013):
The system is going down for reboot NOW!
Remote Archive
--------------
VyOS can upload the configuration to a remote location after each call
to :cfgcmd:`commit`. You will have to set the commit-archive location.
TFTP, FTP, SCP and SFTP servers are supported. Every time a
:cfgcmd:`commit` is successfull the ``config.boot`` file will be copied
to the defined destination(s). The filename used on the remote host will
be ``config.boot-hostname.YYYYMMDD_HHMMSS``.
.. cfgcmd:: set system config-management commit-archive location <URI>
Specify remote location of commit archive as any of the below
:abbr:`URI (Uniform Resource Identifier)`
* ``scp://<user>:<passwd>@<host>:/<dir>``
* ``sftp://<user>:<passwd>@<host>/<dir>``
* ``ftp://<user>:<passwd>@<host>/<dir>``
* ``tftp://<host>/<dir>``
.. note:: The number of revisions don't affect the commit-archive.
.. note:: You may find VyOS not allowing the secure connection because
it cannot verify the legitimacy of the remote server. You can use
the workaround below to quickly add the remote host's SSH
fingerprint to your ``~/.ssh/known_hosts`` file:
.. code-block:: none
vyos@vyos# ssh-keyscan <host> >> ~/.ssh/known_hosts
Saving and loading manually
---------------------------
You can use the ``save`` and ``load`` commands if you want to manually
manage specific configuration files.
When using the save_ command, you can add a specific location where
to store your configuration file. And, when needed it, you will be able
to load it with the ``load`` command:
.. cfgcmd:: load <URI>
Use this command to load a configuration which will replace the
running configuration. Define the location of the configuration file
to be loaded. You can use a path to a local file, an SCP address, an
SFTP address, an FTP address, an HTTP address, an HTTPS address or a
TFTP address.
.. code-block:: none
vyos@vyos# load
Possible completions:
<Enter> Load from system config file
<file> Load from file on local machine
scp://<user>:<passwd>@<host>:/<file> Load from file on remote machine
sftp://<user>:<passwd>@<host>/<file> Load from file on remote machine
ftp://<user>:<passwd>@<host>/<file> Load from file on remote machine
http://<host>/<file> Load from file on remote machine
https://<host>/<file> Load from file on remote machine
tftp://<host>/<file> Load from file on remote machine
Restore Default
---------------
In the case you want to completely delete your configuration and restore
the default one, you can enter the following command in configuration
mode:
.. code-block:: none
load /opt/vyatta/etc/config.boot.default
You will be asked if you want to continue. If you accept, you will have
to use :cfgcmd:`commit` if you want to make the changes active.
Then you may want to :cfgcmd:`save` in order to delete the saved
configuration too.
.. note:: If you are remotely connected, you will lose your connection.
You may want to copy first the config, edit it to ensure
connectivity, and load the edited config.
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