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Re: [libvirt] This patch mounts /run and /var/run before running a sandbox container



On Fri, Jun 22, 2012 at 09:56:39AM -0400, Daniel J Walsh wrote:
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> 
> We do not want to share /run between containers and the host.  This patch
> mounts a tmpfs on /run and then bind mounts /run on /var/run.
> 
> Reason this is pach 0003 is that this is a part of a previous patch set that
> was never applied.
> 
> Sorry to those who are receiving this patch for the second time, as I sent it
> first to the wrong list.
> 
> 
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> >From c04fc4f506644d6621654f16198f5cefaa3ef7a1 Mon Sep 17 00:00:00 2001
> From: Dan Walsh <dwalsh redhat com>
> Date: Tue, 12 Jun 2012 12:08:16 -0400
> Subject: [PATCH 03/10] Must mount /run before the lxc container starts
> 
> ---
>  configure.ac                    |    2 +-
>  src/lxc/lxc_container.c         |   17 +++++++++++++++++
>  src/security/security_selinux.c |    1 +
>  3 files changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
> index a1714c0..7a598e2 100644
> --- a/src/lxc/lxc_container.c
> +++ b/src/lxc/lxc_container.c
> @@ -508,6 +508,23 @@ static int lxcContainerMountBasicFS(virDomainDefPtr def,
>                                   "devfs", "/dev", "tmpfs");
>              goto cleanup;
>          }
> +
> +        VIR_DEBUG("Mount tmpfs on /run type=tmpfs flags=%x, opts=%s",
> +                  MS_NOSUID, opts);
> +        if (mount("tmpfs", "/run", "tmpfs", MS_NOSUID | MS_NODEV , opts) < 0) {
> +            virReportSystemError(errno,
> +                                 _("Failed to mount %s on %s type %s"),
> +                                 "tmpfs", "/run", "tmpfs");
> +            goto cleanup;
> +        }
> +
> +        VIR_DEBUG("Mount /run on /var/run type=bind");
> +        if (mount("/run", "/var/run", "run", MS_BIND , NULL) < 0) {
> +            virReportSystemError(errno,
> +                                 _("Failed to mount %s on %s"),
> +                                 "/run", "/var/run");
> +            goto cleanup;
> +        }

Unfortunately, I realized now that we can't include such a patch. While
we clearly need a custom /run if we're to invoke systemd inside the
container, this is not the only use case for LXC. For other use cases,
it will be desirable to have the host's /run still visible.

I have pushed two paches to add support in libvirt XML for tmpfs and
bind mounts, and have code to replicate this behaviour using the
virt-sandbox-service code instead.

Daniel
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