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Add dns config #1875

Merged
merged 9 commits into from
Jul 21, 2023
Merged

Add dns config #1875

merged 9 commits into from
Jul 21, 2023

Commits on Jul 20, 2023

  1. bootstrap, core/start-blueos-core: Sync host and container resolv.conf 

    This is a workaround to make the container's `resolv.conf` synchronized
with the host's `resolv.conf`. To do that, we disallow docker from
managing the container's DNS nameservers by unmounting the container's
`/etc/resolv.conf`, and soft linking it to the binded host's
`/etc/resolv.conf`.  So for this to work, the container's
`/etc/resolv.conf.host` file should be binded (read-only) to the host's
`/etc/resolv.conf`, for our system, it's configured in
`bootstrap/startup.json.default`, and a patch is added in
`core/tools/blueos_startup_update` so systems with older bootstrap
versions can also work with it.

One detail is that because docker uses `mount` to bind the host's file
to the container's file, if the file-descriptor of the file changes, the
bind will be lost. To prevent this, the file being binded must be a hard
link to the actual `/etc/resolv.conf`, and that hard link file is the
one being binded. This hard link is being done in
`core/tools/blueos_startup_update` as `/etc/resolv.conf.host`.

To briefly understand why it is
necessary, when the docker starts a container, it generates the
container `/etc/resolv.conf` based on the host's one, or some docker
configuration, however, during the container's lifetime, if the host's
DNS configuration changes, the container's DNS doesn't follow it, making
the container (possibly) unable to resolve DNSs correctly, failing the
BlueOS Helper's internet connection check. By syncing the container's
resolv.conf with the host's one, we make sure the container's DNS
configuration follows the host's changes, thus, ensuring the container
is able to resolve DNSs correctly.
    @joaoantoniocardoso
    joaoantoniocardoso committed Jul 20, 2023
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  2. core: services: cable_guy: api: Add DNS helper class

    @joaoantoniocardoso
    joaoantoniocardoso committed Jul 20, 2023
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  3. core: services: cable_guy: api: Add DNS to manager

    @joaoantoniocardoso
    joaoantoniocardoso committed Jul 20, 2023
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  4. core: services: cable_guy: Add DNS endpoints

    @joaoantoniocardoso
    joaoantoniocardoso committed Jul 20, 2023
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  5. core: frontend: src: componenets: app: Add DnsConfigurationMenu

    @joaoantoniocardoso
    joaoantoniocardoso committed Jul 20, 2023
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  6. core: frontend: src: componenets: app: Remove title from NetworkInter… 

    …facePriorityMenu
    @joaoantoniocardoso
    joaoantoniocardoso committed Jul 20, 2023
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  7. core: frontend: src: componenets: app: Change Internet icon to open a… 

    … tabbed container with both Interface Priority and Dns Configuraiton
    @joaoantoniocardoso
    joaoantoniocardoso committed Jul 20, 2023
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  8. core: frontend: components: NetworkInterfacePriorityMenu: Disable app… 

    …ly button when loading
    @joaoantoniocardoso
    joaoantoniocardoso committed Jul 20, 2023
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  9. core: frontend: components: Add notification, close only on success

    @joaoantoniocardoso
    joaoantoniocardoso committed Jul 20, 2023
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