uml: update README to usable examples
The current `uml` README is terribly outdated and non of the examples work by default. Fix that and while at it convert it to Markdown. Signed-off-by: Paul Spooren <mail@aparcar.org>
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Paul Spooren
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2 changed files with 51 additions and 46 deletions
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OpenWrt inside a user mode linux. Why would we even want this many ask?
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There are potentially a lot of reasons, one obvious one to me, it allows
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folks to 'kick the tires' without actually flashing up any hardware. It's
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also a great environment for porting over packages, you can get a package
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fully functional in the uclibc root environment inside a uml without actually
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disturbing your 'real router', and then rebuild for a specific target once
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it's fully tested.
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This is a first stab at a build that 'just works' and there will be more
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cleanup to come. The simple directions are:-
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Configure for uml target
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Configure with an ext4 root file system
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build it all
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In your bin directory you will find a kernel and an ext4 root file system
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when it's finished. Just run it like this:-
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bin/targets/uml/generic/lede-uml-vmlinux
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ubd0=bin/targets/uml/generic/openwrt-uml-ext4.img
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The uml will start, and eventually the serial console of the uml will be at your
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console prompt. If you would like it in xterms, substitute con=xterm and con0=xterm.
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No networking is configured, but, it's a starting point. The resulting file system
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has just enough free space to start kicking the tires and playing in the world of
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'embedded routers' along with all the resource restrictions that come with that
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world.
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To configure networking and more, refer to the user mode linux documentation online.
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A quick start goes along this line. install the uml-utilities packages so you have
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the uml switch in and running, then add a command param to your uml start like this
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eth0=daemon,00:01:01:01:01:01,unix,/<your uml switch control socket here>
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With that in, and uml networking actually functional (can be a challenge at times),
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you should be able to ifconfig the interface and talk to the host side, or, if you
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bridged the uml switch to your host network, you should be able to run udhcp and be
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away with networking off to the world. Again, if you are unfamiliar with uml and
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uml networking, please read the docs and how-to stuff available on the net. It does
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take some fiddling to get it started and working right the first time, but after that,
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it opens up a whole new world of virtual machines.
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http://user-mode-linux.sourceforge.net/
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51
target/linux/uml/README.md
Normal file
51
target/linux/uml/README.md
Normal file
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# OpenWrt inside a user mode linux
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> Why would we even want this many ask?
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There are potentially a lot of reasons, one obvious one to me, it allows folks
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to 'kick the tires' without actually flashing up any hardware. It's also a
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great environment for porting over packages, you can get a package fully
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functional in the uclibc root environment inside a uml without actually
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disturbing your 'real router', and then rebuild for a specific target once it's
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fully tested.
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This is a first stab at a build that 'just works' and there will be more
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cleanup to come. The simple directions are:-
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* Configure for uml target
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* Configure with an ext4 or squashfs root file system
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* Build it all
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In your bin directory you will find a Kernel and an root file system when it's
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finished. Just run it like this:-
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```shell
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./openwrt-uml-vmlinux ubd0=openwrt-uml-squashfs.img
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```
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The uml will start and eventually the serial console of the uml will be at your
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console prompt. If you would like it in xterms, substitute `con=xterm` and
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`con0=xterm`. **No networking is configured** but it's a starting point. The
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resulting file system has just enough free space to start kicking the tires and
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playing in the world of 'embedded routers' along with all the resource
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restrictions that come with that world.
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To configure networking and more refer to the *user mode linux* documentation
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online. A quick start goes along this line. Install the `uml-utilities`
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packages so you have the `uml_switch` in and running, then add a command param
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to your uml start like this:
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```shell
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eth0=daemon,00:01:01:01:01:01,unix,/<your uml switch control socket here>
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```
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With that in, and uml networking actually functional (can be a challenge at
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times), you should be able to `ifconfig` the interface and talk to the host
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side or if you bridged the uml switch to your host network, you should be able
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to run `udhcp` and be away with networking off to the world. Again, if you are
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unfamiliar with uml and uml networking, please read the docs and how-to stuff
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available on the net. It does take some fiddling to get it started and working
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right the first time, but after that, it opens up a whole new world of virtual
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machines.
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http://user-mode-linux.sourceforge.net/
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