[lxc-devel] [PATCH] hooks/ubuntu-cloud-prep: add hostname to meta-data

[Serge Hallyn]

Quoting Scott Moser (smoser at ubuntu.com):
> prior to my enabling of the clone hook, the setting of the hostname
> was being done by writing to /etc/hostname.  Instead of relying on that
> we're now writing 'local-hostname' into the metadata for the instance.
> 
> cloud-init then reads this and sets the hostname properly.
> 
> We are also writing /etc/hostname with the new hostname explicitly.  This is
> useful/necessary because on network bringup of eth0, dhclient will submit its
> hosname.  The updating done by cloud-init occurs to late, and thus
> the dhcp request goes out with the un-configured hostname and dns doens't
> work correctly.
> 
> Signed-off-by: Scott Moser <smoser at ubuntu.com>

Acked-by: Serge E. Hallyn <serge.hallyn at ubuntu.com>

Thanks, Scott.

-serge

> ---
>  hooks/ubuntu-cloud-prep | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/hooks/ubuntu-cloud-prep b/hooks/ubuntu-cloud-prep
> index c4c3620..f0b30ea 100755
> --- a/hooks/ubuntu-cloud-prep
> +++ b/hooks/ubuntu-cloud-prep
> @@ -49,8 +49,8 @@ prep() {
>      fi
>  
>      local cur="" next=""
> -    local userdata="" hostid="" authkey="" locales=1 cloud=0 name=""
> -    local create_etc_init=0
> +    local userdata="" hostid="" authkey="" locales=1 cloud=0
> +    local create_etc_init=0 name="ubuntucloud-lxc"
>  
>      while [ $# -ne 0 ]; do
>          cur="$1"; next="$2";
> @@ -97,6 +97,10 @@ prep() {
>  
>      local seed_d=""
>      seed_d="$root_d/var/lib/cloud/seed/nocloud-net"
> +
> +    echo "$name" > "$root_d/etc/hostname" ||
> +        { error "failed to write /etc/hostname"; return 1; }
> +
>      if [ $cloud -eq 1 ]; then
>          debug 1 "--cloud provided, not modifying seed in '$seed_d'"
>      else
> @@ -110,6 +114,9 @@ prep() {
>          echo "instance-id: lxc-$hostid" > "$seed_d/meta-data" ||
>              { error "failed to write to $seed_d/meta-data"; return 1; }
>  
> +        echo "local-hostname: $name" >> "$seed_d/meta-data" ||
> +            { error "failed to write to $seed_d/meta-data"; return 1; }
> +
>          if [ -n "$authkey" ]; then
>              {
>                  echo "public-keys:" &&
> -- 
> 1.8.3.2
> 
> 
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