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docs: Add step to resolve DNS for installing packages

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For installing packages for the custom Ubuntu image, we
need to setup DNS inside the chroot.

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>
This commit is contained in:
Archana Shinde 2022-07-11 18:01:20 -07:00 committed by Rob Bradford
parent e1cf889dbd
commit 28683b8471
1 changed files with 11 additions and 0 deletions
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docs/custom-image.md
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@ -59,6 +59,16 @@ mkdir -p /mnt
sudo mount -o loop,offset=$((227328 * 512)) focal-server-cloudimg-amd64.raw /mnt
```
### Set up DNS
The next step describes changing the root directory to the rootfs contained by
the cloud image. For DNS to work in the root directory, you will need to first bind-mount
the host `/etc/resolv.conf` onto the mounted linux partition of the cloud image.
```bash
sudo mount -o bind /etc/resolv.conf /mnt/etc/resolv.conf
```
### Change root directory
Changing the root directory will allow us to install new packages to the rootfs
@ -108,6 +118,7 @@ umount /dev/pts
umount /proc
history -c
exit
umount /mnt/etc/resolv.conf
umount /mnt
```