On 2018-10-07 17:00, Daniel Golle wrote:
On Sun, Oct 07, 2018 at 04:54:42PM +0200, Torbjorn Jansson wrote:
On 2018-09-30 16:21, Daniel Golle wrote:
On Sun, Sep 30, 2018 at 02:18:54PM +0200, Torbjorn Jansson wrote:
On 2018-09-30 13:59, Daniel Golle wrote:
On Sun, Sep 30, 2018 at 12:21:12PM +0200, Torbjorn Jansson wrote:
Hello.
a question, is it possible to run docker on openwrt?
reason for asking is that i got a raspberrypi running openwrt and it got
plenty of storage space and is mostly sitting idle so if i can run docker on
it i might be able to consolidate some of the other pis i have for various
purposes.
i know you can do it the other way around, running openwrt in a docker
instance on a regular computer but can you get docker itself to run under
openwrt?
ideas, suggestions?
Just use LXC, that works well on OpenWrt, I'm using that to run various
containers running Debian and OpenWrt on top of OpenWrt.
(but you need to compile it yourself because many of the kernel options
needed for containers aren't enabled by default)
Docker didn't attract a lot of interest because it is x86_64 and
ARM-only, so 80% of OpenWrt-supported devices aren't supported by
Docker which doesn't provide images for MIPS-like CPUs.
However, now that Golang has been added to the packages feed we could
package Docker at least for the platforms supported by it...
ok, i see.
i've never tried lxc and i think docker also needs some extra kernel config
options for it to work.
i ran the script from:
https://raw.githubusercontent.com/docker/docker/master/contrib/check-config.sh
on one of my boxes and it complained about:
- CONFIG_NAMESPACES: missing
- CONFIG_NET_NS: missing
- CONFIG_PID_NS: missing
- CONFIG_IPC_NS: missing
- CONFIG_UTS_NS: missing
- CONFIG_CGROUPS: missing
- CONFIG_CGROUP_CPUACCT: missing
- CONFIG_CGROUP_DEVICE: missing
- CONFIG_CGROUP_FREEZER: missing
- CONFIG_CGROUP_SCHED: missing
- CONFIG_CPUSETS: missing
- CONFIG_MEMCG: missing
- CONFIG_NETFILTER_XT_MATCH_IPVS: missing
- CONFIG_POSIX_MQUEUE: missing
and then there were a bunch of optional features also missing.
For now the binary distribution doesn't have all those kernel features
enabled. You need to compile from source and make sure that
CONFIG_LXC_KERNEL_OPTIONS is set, this selects all the kernel options
needed to run containers.
a followup question, where in the "make menuconfig" menu system do i find LXC?
i have looked everywhere and it is nowhere to be found.
if i add CONFIG_LXC_KERNEL_OPTIONS=y manually to .config and then run "make
menuconfig" the LXC option disappears.
i can't figure out what (if any) dependencies i have to select first to make
it show up.
you need to install LXC from the packages feed.
ie.
```
scripts/feeds update packages
scripts/feeds install lxc
```
should do the trick.
that worked, but i don't understand exactly what i did wrong before because the
lxc files were already available under: feeds/packages/utils/lxc
so it is not enough for a package to have its files in the structure, they also
must be "installed" to show up?
i wonder what i did wrong because i know previous tries of building openwrt i
got all packages built but perhaps i missed something this time.
anyway, i got lxc kernel options built and after a bit of fiddling with other
packages (iptables "extra" package & kmod for it) i got the basic docker
hello-world container to work.
so i think i'm going to do a bit more reading regarding packages and see if i
can get something that works.
_______________________________________________
openwrt-devel mailing list
openwrt-devel@lists.openwrt.org
https://lists.openwrt.org/mailman/listinfo/openwrt-devel
